Date   

Re: Which do I keep? 1949 9" Tool Room or 1935 9" Heavy

wlw19958
 

Hi There,

If at all possible, keep both.  I believe one should have at least 2 lathes.
One reason is that when one lathe breaks, you can use the other one to
make the parts or repairs for the first one.  Also, there will be times that
you have made a crucial set-up on one lathe and then a job comes up 
and you need to take down the set-up to do the other job.  With two lathes,
you wouldn't have to take down that crucial set-up.

If it is impossible to keep both, then the lathe that is in the best condition
should be your choice.  If both are equally good, then the better tooled.

Good Luck!
-Blue Chips-
Webb


Re: Which do I keep? 1949 9" Tool Room or 1935 9" Heavy

Roger Bickers
 

Sell both and get a Heavy 10. The ability to use 5c collets speaks volumes.  

Roger


On Mon, Mar 8, 2021 at 9:59 AM, Vince Eugenio
<vince.eugenio.phd@...> wrote:
Hi folks!

I am fortunate enough to be presented with a good problem that I would like the perspective of the group on. I have two South Bend 9" lathes. A very nice 1949 tool room catalog 8644A with a 4ft bed and all the goodies such as taper attachment, collets, chucks, steady rest, face plates with dogs, milling attachment, etc. The other lathe is a very nice 1935 480YN with a 3ft bed with two chucks, face plate, some tooling, and steady rest. It also has the factory maple stand. 

For context, I am getting ready to retire in about a year.  I am a former shop teacher who wants to do a little metal working to complement my woodworking, motorcycle and car hobbies. The 480YN is a much more substantial lathe than the 9" tool room, but the toolroom is very well equipped. Much more than the 480YN. 

Frankly I am very torn. I am leaning toward one but would like the opinion of the group. Once my decision is made, the other lathe will go up for sale. Thanks for any input!!

--

Regards,

Vince



Re: Which do I keep? 1949 9" Tool Room or 1935 9" Heavy

Steve Wells
 

The Workshop 9A would probably be the one to keep, longer bed, lots more accessories available, higher spindle speeds, better lubrication system.

The hobby cash from the sale of the Letter series 9 would buy more tooling for the 9A than the other way around. Don’t think a taper attachment for a wide bed 9 inch is

going to be low cost, or even available, and the list goes on, but I would like to see the maple bench, can you post a picture please.

 

Steve

 

From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> On Behalf Of Vince Eugenio
Sent: Monday, March 8, 2021 9:59 AM
To: SouthBendLathe@groups.io
Subject: [SouthBendLathe] Which do I keep? 1949 9" Tool Room or 1935 9" Heavy

 

Hi folks!

 

I am fortunate enough to be presented with a good problem that I would like the perspective of the group on. I have two South Bend 9" lathes. A very nice 1949 tool room catalog 8644A with a 4ft bed and all the goodies such as taper attachment, collets, chucks, steady rest, face plates with dogs, milling attachment, etc. The other lathe is a very nice 1935 480YN with a 3ft bed with two chucks, face plate, some tooling, and steady rest. It also has the factory maple stand. 

 

For context, I am getting ready to retire in about a year.  I am a former shop teacher who wants to do a little metal working to complement my woodworking, motorcycle and car hobbies. The 480YN is a much more substantial lathe than the 9" tool room, but the toolroom is very well equipped. Much more than the 480YN. 

 

Frankly I am very torn. I am leaning toward one but would like the opinion of the group. Once my decision is made, the other lathe will go up for sale. Thanks for any input!!

 

--

Regards,

Vince

 


Re: Which do I keep? 1949 9" Tool Room or 1935 9" Heavy

Vince Eugenio
 

Hi Dave,

It is interesting to see the variation. My 480YN uses a double wall apron and a single tumbler gear box. SB made a big deal about the composition of the casting being 50% steel of the 480YN and having heavier construction. Bed width from CL of outside to outside prism is 6 3/8 vs 5 1/8 for the toolroom. 

Vince

On Mon, Mar 8, 2021 at 10:44 AM david pennington via groups.io <davidwpennington=yahoo.com@groups.io> wrote:
Vince,

That's fascinating. My '46 9C is a 415YC. It probably more like your tool room lathe.

-------- Original message --------
From: Vince Eugenio <vince.eugenio.phd@...>
Date: 3/8/21 08:29 (GMT-07:00)
Subject: Re: [SouthBendLathe] Which do I keep? 1949 9" Tool Room or 1935 9" Heavy

Hi Dave,

Thanks for your response. Some of the accessories would work from the toolroom to the heavy, but the bed is significantly wider on the 480YN and the headstock is larger and deeper as well. Also, the mounting for the compound slide is different as well. 

Vince

On Mon, Mar 8, 2021 at 10:25 AM david pennington via groups.io <davidwpennington=yahoo.com@groups.io> wrote:
Vince, the tool room lathe is my pick, too, for similar reasons. For me, the joy lies in precision and versatility, not in making heavy cuts.

Question: if you were to keep the '35, don't all the accessories for the '49 fit it?


-------- Original message --------
From: Vince Eugenio <vince.eugenio.phd@...>
Date: 3/8/21 08:00 (GMT-07:00)
Subject: [SouthBendLathe] Which do I keep? 1949 9" Tool Room or 1935 9" Heavy

Hi folks!

I am fortunate enough to be presented with a good problem that I would like the perspective of the group on. I have two South Bend 9" lathes. A very nice 1949 tool room catalog 8644A with a 4ft bed and all the goodies such as taper attachment, collets, chucks, steady rest, face plates with dogs, milling attachment, etc. The other lathe is a very nice 1935 480YN with a 3ft bed with two chucks, face plate, some tooling, and steady rest. It also has the factory maple stand. 

For context, I am getting ready to retire in about a year.  I am a former shop teacher who wants to do a little metal working to complement my woodworking, motorcycle and car hobbies. The 480YN is a much more substantial lathe than the 9" tool room, but the toolroom is very well equipped. Much more than the 480YN. 

Frankly I am very torn. I am leaning toward one but would like the opinion of the group. Once my decision is made, the other lathe will go up for sale. Thanks for any input!!

--

Regards,

Vince




--

Regards,

Vince

Vince Eugenio, PhD ACC CCMC CELDC
Coach and Senior Talent Management Leader
404 277 2426
http://www.linkedin.com/in/vinceeugeniophd



--

Regards,

Vince

Vince Eugenio, PhD ACC CCMC CELDC
Coach and Senior Talent Management Leader
404 277 2426
http://www.linkedin.com/in/vinceeugeniophd


Re: Which do I keep? 1949 9" Tool Room or 1935 9" Heavy

david pennington
 

Vince,

That's fascinating. My '46 9C is a 415YC. It probably more like your tool room lathe.

-------- Original message --------
From: Vince Eugenio <vince.eugenio.phd@...>
Date: 3/8/21 08:29 (GMT-07:00)
To: SouthBendLathe@groups.io
Subject: Re: [SouthBendLathe] Which do I keep? 1949 9" Tool Room or 1935 9" Heavy

Hi Dave,

Thanks for your response. Some of the accessories would work from the toolroom to the heavy, but the bed is significantly wider on the 480YN and the headstock is larger and deeper as well. Also, the mounting for the compound slide is different as well. 

Vince

On Mon, Mar 8, 2021 at 10:25 AM david pennington via groups.io <davidwpennington=yahoo.com@groups.io> wrote:
Vince, the tool room lathe is my pick, too, for similar reasons. For me, the joy lies in precision and versatility, not in making heavy cuts.

Question: if you were to keep the '35, don't all the accessories for the '49 fit it?


-------- Original message --------
From: Vince Eugenio <vince.eugenio.phd@...>
Date: 3/8/21 08:00 (GMT-07:00)
Subject: [SouthBendLathe] Which do I keep? 1949 9" Tool Room or 1935 9" Heavy

Hi folks!

I am fortunate enough to be presented with a good problem that I would like the perspective of the group on. I have two South Bend 9" lathes. A very nice 1949 tool room catalog 8644A with a 4ft bed and all the goodies such as taper attachment, collets, chucks, steady rest, face plates with dogs, milling attachment, etc. The other lathe is a very nice 1935 480YN with a 3ft bed with two chucks, face plate, some tooling, and steady rest. It also has the factory maple stand. 

For context, I am getting ready to retire in about a year.  I am a former shop teacher who wants to do a little metal working to complement my woodworking, motorcycle and car hobbies. The 480YN is a much more substantial lathe than the 9" tool room, but the toolroom is very well equipped. Much more than the 480YN. 

Frankly I am very torn. I am leaning toward one but would like the opinion of the group. Once my decision is made, the other lathe will go up for sale. Thanks for any input!!

--

Regards,

Vince




--

Regards,

Vince

Vince Eugenio, PhD ACC CCMC CELDC
Coach and Senior Talent Management Leader
404 277 2426
http://www.linkedin.com/in/vinceeugeniophd


Re: Which do I keep? 1949 9" Tool Room or 1935 9" Heavy

Vince Eugenio
 

Hi Dave,

Thanks for your response. Some of the accessories would work from the toolroom to the heavy, but the bed is significantly wider on the 480YN and the headstock is larger and deeper as well. Also, the mounting for the compound slide is different as well. 

Vince

On Mon, Mar 8, 2021 at 10:25 AM david pennington via groups.io <davidwpennington=yahoo.com@groups.io> wrote:
Vince, the tool room lathe is my pick, too, for similar reasons. For me, the joy lies in precision and versatility, not in making heavy cuts.

Question: if you were to keep the '35, don't all the accessories for the '49 fit it?


-------- Original message --------
From: Vince Eugenio <vince.eugenio.phd@...>
Date: 3/8/21 08:00 (GMT-07:00)
Subject: [SouthBendLathe] Which do I keep? 1949 9" Tool Room or 1935 9" Heavy

Hi folks!

I am fortunate enough to be presented with a good problem that I would like the perspective of the group on. I have two South Bend 9" lathes. A very nice 1949 tool room catalog 8644A with a 4ft bed and all the goodies such as taper attachment, collets, chucks, steady rest, face plates with dogs, milling attachment, etc. The other lathe is a very nice 1935 480YN with a 3ft bed with two chucks, face plate, some tooling, and steady rest. It also has the factory maple stand. 

For context, I am getting ready to retire in about a year.  I am a former shop teacher who wants to do a little metal working to complement my woodworking, motorcycle and car hobbies. The 480YN is a much more substantial lathe than the 9" tool room, but the toolroom is very well equipped. Much more than the 480YN. 

Frankly I am very torn. I am leaning toward one but would like the opinion of the group. Once my decision is made, the other lathe will go up for sale. Thanks for any input!!

--

Regards,

Vince




--

Regards,

Vince

Vince Eugenio, PhD ACC CCMC CELDC
Coach and Senior Talent Management Leader
404 277 2426
http://www.linkedin.com/in/vinceeugeniophd


Re: Which do I keep? 1949 9" Tool Room or 1935 9" Heavy

James Rice
 

I’d keep both.

Jamea


On Mar 8, 2021, at 9:00 AM, Vince Eugenio <vince.eugenio.phd@...> wrote:


Hi folks!

I am fortunate enough to be presented with a good problem that I would like the perspective of the group on. I have two South Bend 9" lathes. A very nice 1949 tool room catalog 8644A with a 4ft bed and all the goodies such as taper attachment, collets, chucks, steady rest, face plates with dogs, milling attachment, etc. The other lathe is a very nice 1935 480YN with a 3ft bed with two chucks, face plate, some tooling, and steady rest. It also has the factory maple stand. 

For context, I am getting ready to retire in about a year.  I am a former shop teacher who wants to do a little metal working to complement my woodworking, motorcycle and car hobbies. The 480YN is a much more substantial lathe than the 9" tool room, but the toolroom is very well equipped. Much more than the 480YN. 

Frankly I am very torn. I am leaning toward one but would like the opinion of the group. Once my decision is made, the other lathe will go up for sale. Thanks for any input!!

--

Regards,

Vince



Re: Which do I keep? 1949 9" Tool Room or 1935 9" Heavy

david pennington
 

Vince, the tool room lathe is my pick, too, for similar reasons. For me, the joy lies in precision and versatility, not in making heavy cuts.

Question: if you were to keep the '35, don't all the accessories for the '49 fit it?


-------- Original message --------
From: Vince Eugenio <vince.eugenio.phd@...>
Date: 3/8/21 08:00 (GMT-07:00)
To: SouthBendLathe@groups.io
Subject: [SouthBendLathe] Which do I keep? 1949 9" Tool Room or 1935 9" Heavy

Hi folks!

I am fortunate enough to be presented with a good problem that I would like the perspective of the group on. I have two South Bend 9" lathes. A very nice 1949 tool room catalog 8644A with a 4ft bed and all the goodies such as taper attachment, collets, chucks, steady rest, face plates with dogs, milling attachment, etc. The other lathe is a very nice 1935 480YN with a 3ft bed with two chucks, face plate, some tooling, and steady rest. It also has the factory maple stand. 

For context, I am getting ready to retire in about a year.  I am a former shop teacher who wants to do a little metal working to complement my woodworking, motorcycle and car hobbies. The 480YN is a much more substantial lathe than the 9" tool room, but the toolroom is very well equipped. Much more than the 480YN. 

Frankly I am very torn. I am leaning toward one but would like the opinion of the group. Once my decision is made, the other lathe will go up for sale. Thanks for any input!!

--

Regards,

Vince



Re: Which do I keep? 1949 9" Tool Room or 1935 9" Heavy

mby852@...
 

For me and if I had the room I'd keep them both. 


Re: Which do I keep? 1949 9" Tool Room or 1935 9" Heavy

Andrei
 

Vince, my vote is for the tool room lathe. It is better tooled, and you will be using it for a hobby.


From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> on behalf of Vince Eugenio <vince.eugenio.phd@...>
Sent: Monday, March 8, 2021 9:59 AM
To: SouthBendLathe@groups.io <SouthBendLathe@groups.io>
Subject: [SouthBendLathe] Which do I keep? 1949 9" Tool Room or 1935 9" Heavy
 
Hi folks!

I am fortunate enough to be presented with a good problem that I would like the perspective of the group on. I have two South Bend 9" lathes. A very nice 1949 tool room catalog 8644A with a 4ft bed and all the goodies such as taper attachment, collets, chucks, steady rest, face plates with dogs, milling attachment, etc. The other lathe is a very nice 1935 480YN with a 3ft bed with two chucks, face plate, some tooling, and steady rest. It also has the factory maple stand. 

For context, I am getting ready to retire in about a year.  I am a former shop teacher who wants to do a little metal working to complement my woodworking, motorcycle and car hobbies. The 480YN is a much more substantial lathe than the 9" tool room, but the toolroom is very well equipped. Much more than the 480YN. 

Frankly I am very torn. I am leaning toward one but would like the opinion of the group. Once my decision is made, the other lathe will go up for sale. Thanks for any input!!

--

Regards,

Vince



Which do I keep? 1949 9" Tool Room or 1935 9" Heavy

Vince Eugenio
 

Hi folks!

I am fortunate enough to be presented with a good problem that I would like the perspective of the group on. I have two South Bend 9" lathes. A very nice 1949 tool room catalog 8644A with a 4ft bed and all the goodies such as taper attachment, collets, chucks, steady rest, face plates with dogs, milling attachment, etc. The other lathe is a very nice 1935 480YN with a 3ft bed with two chucks, face plate, some tooling, and steady rest. It also has the factory maple stand. 

For context, I am getting ready to retire in about a year.  I am a former shop teacher who wants to do a little metal working to complement my woodworking, motorcycle and car hobbies. The 480YN is a much more substantial lathe than the 9" tool room, but the toolroom is very well equipped. Much more than the 480YN. 

Frankly I am very torn. I am leaning toward one but would like the opinion of the group. Once my decision is made, the other lathe will go up for sale. Thanks for any input!!

--

Regards,

Vince



Re: Making the SB threading stop

trackthatpot2000
 

Just a few minutes with the hacksaw and now it’s ready for milling.


Making the SB threading stop

trackthatpot2000
 
Edited

I decided to make the version that is split into two parts because I couldn’t find a piece of cast iron large enough for a one part version.
But I found this chunk 90mm X 90mm X 25mm. on eBay. I marked it out and then marked it out again for chain dot drilling...this is 13” size.


Re: Single Point Left Hand Threading

sblatheman
 

Steve,
The tubes were 1 1/2 oz. (see picture from my 1967 catalog)
I will send you an email later today.

Ted

On Mar 7, 2021, at 11:05 AM, Steve Wells <wswells@earthlink.net> wrote:

Thanks Ted, I'll correct that.
That means it is the only one left, and I have the saddle off the other one.
I keep breaking the old style finisher bit, my fault, not the machine, but
I might have to switch over to the carbide tool holders as you suggested.
I found the print for them in the big book.
On a different note, are you about out of felt yet?
I am close, so I'll probably submit an order this month.
Also ECL (Roy Dean) spec'ed for me, an upgraded replacement grease
for DE-112, SBL-CE1625. can you remember those Roy Dean tubes?
Were they 2 oz? I'm trying to nail down what the fill quantity is.
I'll send you some of the new grease to try when it arrives.

Steve

-----Original Message-----
From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> On Behalf Of sblatheman via groups.io
Sent: Sunday, March 7, 2021 10:25 AM
To: SouthBendLathe@groups.io
Subject: Re: [SouthBendLathe] Single Point Left Hand Threading

Steve,
FYI: there were only 2 special crossfeed screw machines at the SBL plant.
There were 3 or 4 of a similar design for leadscrews.

Ted

On Mar 7, 2021, at 9:50 AM, Steve Wells <wswells@earthlink.net> wrote:

https://youtu.be/9P-Qqc0uGyM

Steve


-----Original Message-----
From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> On Behalf Of Steve Wells
Sent: Sunday, March 7, 2021 9:45 AM
To: SouthBendLathe@groups.io
Subject: Re: [SouthBendLathe] Single Point Left Hand Threading

Saving subject posts for the FTE webpage...:)

Correct, the SBL automatic feed screw machine threads at 0 degrees, straight in, in both directions, reversing the spindle and leadscrew direction on front and rear tool bit passes.
Another little strange fact, at the minor flat of the acme thread, the SBL print has a 0.010 depth square clearance cut. This is cut by the front "rougher bit" flank minor, which has this square flank extension profile.

Steve


-----Original Message-----
From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> On Behalf Of m. allan noah
Sent: Sunday, March 7, 2021 9:06 AM
To: SouthBendLathe@groups.io
Subject: Re: [SouthBendLathe] Single Point Left Hand Threading

On Sun, Mar 7, 2021 at 8:24 AM Guenther Paul <paulguenter@att.net> wrote:
You can through that book away American and metric thread is 60 degree not 58 you set the compound on 30 degree.
The British withworth thread is 55 degree

Sigh. Think about it. The angle of the compound in-feed does not set the angle of the thread- the shape of the tool does. The 29 degree thing is so you always cut a little on the back side, leaving a clean flank, but do the bulk of the cutting in a direction that keeps the backlash taken up in the compound. So, the angle does not matter at all. I thread with the cross feed going straight in, and don't touch the compound at all, regardless of handedness. I certainly don't make a 0 degree thread :)

allan

--
"well, I stand up next to a mountain- and I chop it down with the edge of my hand"



























Re: Single Point Left Hand Threading

Ondrej Krejci
 

Greetings,

The idea of feeding the threading bit one degree less than the smallest half angle towards the direction of cutting:  29° for 60°, 26.5° for 55°, 0.5° or 14° for most butress types; is that the tensioned side will be rougher, slightly scraped by the back side of the bit and have a lower tendency to loosen.
Otherwise, one can feed in with the cross slide with an undersized tool, almost sharp tipped in case of V-type threads, then, having the compound set parallel to the ways, take side to side passes to achieve size and make both flanks shiny.

Enjoy,


OK

On Sunday, March 7, 2021, 11:05:15 AM EST, Steve Wells <wswells@...> wrote:


Thanks Ted, I'll correct that.
That means it is the only one left, and I have the saddle off the other one.
I keep breaking the old style finisher bit, my fault, not the machine, but
I might have to switch over to the carbide tool holders as you suggested.
I found the print for them in the big book.
On a different note, are you about out of felt yet?
I am close, so I'll probably submit an order this month.
Also ECL (Roy Dean) spec'ed for me, an upgraded replacement grease
for DE-112, SBL-CE1625. can you remember those Roy Dean tubes?
Were they 2 oz? I'm trying to nail down what the fill quantity is.
I'll send you some of the new grease to try when it arrives.

Steve 

-----Original Message-----
From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> On Behalf Of sblatheman via groups.io
Sent: Sunday, March 7, 2021 10:25 AM
To: SouthBendLathe@groups.io
Subject: Re: [SouthBendLathe] Single Point Left Hand Threading

Steve,
FYI:  there were only 2 special crossfeed screw machines at the SBL plant.
There were 3 or 4 of a similar design for leadscrews.

Ted

> On Mar 7, 2021, at 9:50 AM, Steve Wells <wswells@...> wrote:
>
> https://youtu.be/9P-Qqc0uGyM
>
> Steve
>
>
> -----Original Message-----
> From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> On Behalf Of Steve Wells
> Sent: Sunday, March 7, 2021 9:45 AM
> To: SouthBendLathe@groups.io
> Subject: Re: [SouthBendLathe] Single Point Left Hand Threading
>
> Saving subject posts for the FTE webpage...:)
>
> Correct, the SBL automatic feed screw machine threads at 0 degrees, straight in, in both directions, reversing the spindle and leadscrew direction on front and rear tool bit passes.
> Another little strange fact, at the minor flat of the acme thread, the SBL print has a 0.010 depth square clearance cut. This is cut by the front "rougher bit" flank minor, which has this square flank extension profile.
>
> Steve
>
>
> -----Original Message-----
> From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> On Behalf Of m. allan noah
> Sent: Sunday, March 7, 2021 9:06 AM
> To: SouthBendLathe@groups.io
> Subject: Re: [SouthBendLathe] Single Point Left Hand Threading
>
>> On Sun, Mar 7, 2021 at 8:24 AM Guenther Paul <paulguenter@...> wrote:
>>
>> You can through that book away American and metric thread is 60 degree not 58 you set the compound on 30 degree.
>> The British withworth thread is 55 degree
>>
>
>
> Sigh. Think about it. The angle of the compound in-feed does not set the angle of the thread- the shape of the tool does. The 29 degree thing is so you always cut a little on the back side, leaving a clean flank, but do the bulk of the cutting in a direction that keeps the backlash taken up in the compound. So, the angle does not matter at all. I thread with the cross feed going straight in, and don't touch the compound at all, regardless of handedness. I certainly don't make a 0 degree thread :)
>
> allan
>
> --
> "well, I stand up next to a mountain- and I chop it down with the edge of my hand"
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>













Re: Single Point Left Hand Threading

Steve Wells
 

Thanks Ted, I'll correct that.
That means it is the only one left, and I have the saddle off the other one.
I keep breaking the old style finisher bit, my fault, not the machine, but
I might have to switch over to the carbide tool holders as you suggested.
I found the print for them in the big book.
On a different note, are you about out of felt yet?
I am close, so I'll probably submit an order this month.
Also ECL (Roy Dean) spec'ed for me, an upgraded replacement grease
for DE-112, SBL-CE1625. can you remember those Roy Dean tubes?
Were they 2 oz? I'm trying to nail down what the fill quantity is.
I'll send you some of the new grease to try when it arrives.

Steve

-----Original Message-----
From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> On Behalf Of sblatheman via groups.io
Sent: Sunday, March 7, 2021 10:25 AM
To: SouthBendLathe@groups.io
Subject: Re: [SouthBendLathe] Single Point Left Hand Threading

Steve,
FYI: there were only 2 special crossfeed screw machines at the SBL plant.
There were 3 or 4 of a similar design for leadscrews.

Ted

On Mar 7, 2021, at 9:50 AM, Steve Wells <wswells@earthlink.net> wrote:

https://youtu.be/9P-Qqc0uGyM

Steve


-----Original Message-----
From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> On Behalf Of Steve Wells
Sent: Sunday, March 7, 2021 9:45 AM
To: SouthBendLathe@groups.io
Subject: Re: [SouthBendLathe] Single Point Left Hand Threading

Saving subject posts for the FTE webpage...:)

Correct, the SBL automatic feed screw machine threads at 0 degrees, straight in, in both directions, reversing the spindle and leadscrew direction on front and rear tool bit passes.
Another little strange fact, at the minor flat of the acme thread, the SBL print has a 0.010 depth square clearance cut. This is cut by the front "rougher bit" flank minor, which has this square flank extension profile.

Steve


-----Original Message-----
From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> On Behalf Of m. allan noah
Sent: Sunday, March 7, 2021 9:06 AM
To: SouthBendLathe@groups.io
Subject: Re: [SouthBendLathe] Single Point Left Hand Threading

On Sun, Mar 7, 2021 at 8:24 AM Guenther Paul <paulguenter@att.net> wrote:

You can through that book away American and metric thread is 60 degree not 58 you set the compound on 30 degree.
The British withworth thread is 55 degree

Sigh. Think about it. The angle of the compound in-feed does not set the angle of the thread- the shape of the tool does. The 29 degree thing is so you always cut a little on the back side, leaving a clean flank, but do the bulk of the cutting in a direction that keeps the backlash taken up in the compound. So, the angle does not matter at all. I thread with the cross feed going straight in, and don't touch the compound at all, regardless of handedness. I certainly don't make a 0 degree thread :)

allan

--
"well, I stand up next to a mountain- and I chop it down with the edge of my hand"

















Re: Single Point Left Hand Threading

sblatheman
 

Steve,
FYI: there were only 2 special crossfeed screw machines at the SBL plant.
There were 3 or 4 of a similar design for leadscrews.

Ted

On Mar 7, 2021, at 9:50 AM, Steve Wells <wswells@earthlink.net> wrote:

https://youtu.be/9P-Qqc0uGyM

Steve


-----Original Message-----
From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> On Behalf Of Steve Wells
Sent: Sunday, March 7, 2021 9:45 AM
To: SouthBendLathe@groups.io
Subject: Re: [SouthBendLathe] Single Point Left Hand Threading

Saving subject posts for the FTE webpage...:)

Correct, the SBL automatic feed screw machine threads at 0 degrees, straight in, in both directions, reversing the spindle and leadscrew direction on front and rear tool bit passes.
Another little strange fact, at the minor flat of the acme thread, the SBL print has a 0.010 depth square clearance cut. This is cut by the front "rougher bit" flank minor, which has this square flank extension profile.

Steve


-----Original Message-----
From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> On Behalf Of m. allan noah
Sent: Sunday, March 7, 2021 9:06 AM
To: SouthBendLathe@groups.io
Subject: Re: [SouthBendLathe] Single Point Left Hand Threading

On Sun, Mar 7, 2021 at 8:24 AM Guenther Paul <paulguenter@att.net> wrote:

You can through that book away American and metric thread is 60 degree not 58 you set the compound on 30 degree.
The British withworth thread is 55 degree

Sigh. Think about it. The angle of the compound in-feed does not set the angle of the thread- the shape of the tool does. The 29 degree thing is so you always cut a little on the back side, leaving a clean flank, but do the bulk of the cutting in a direction that keeps the backlash taken up in the compound. So, the angle does not matter at all. I thread with the cross feed going straight in, and don't touch the compound at all, regardless of handedness. I certainly don't make a 0 degree thread :)

allan

--
"well, I stand up next to a mountain- and I chop it down with the edge of my hand"

















Re: Single Point Left Hand Threading

Steven H
 

https://youtu.be/FRa5An0i_sM 

This is MrPete222 You Tube video link for cutting EXTERNAL left hand thread. You can find other videos on You Tube. Are you cutting and external or internal thread?

Steve Haskell

On Mar 7, 2021, at 9:06 AM, m. allan noah <kitno455@...> wrote:

On Sun, Mar 7, 2021 at 8:24 AM Guenther Paul <paulguenter@...> wrote:

You can through that book away American and metric thread is 60 degree not 58 you set the compound on 30 degree.
The British withworth thread is 55 degree



Sigh. Think about it. The angle of the compound in-feed does not set
the angle of the thread- the shape of the tool does. The 29 degree
thing is so you always cut a little on the back side, leaving a clean
flank, but do the bulk of the cutting in a direction that keeps the
backlash taken up in the compound. So, the angle does not matter at
all. I thread with the cross feed going straight in, and don't touch
the compound at all, regardless of handedness. I certainly don't make
a 0 degree thread :)

allan

--
"well, I stand up next to a mountain- and I chop it down with the edge
of my hand"






Re: Single Point Left Hand Threading

ww_big_al
 

Marc (That Lazy Machinist) put up a good video explaining compound rest threading angles. He was an industrial arts instructor at a Canadian college.
https://www.youtube.com/watch?v=IOwFMUBWyw0
Al

-----Original Message-----
From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> On Behalf Of Steve Wells
Sent: Sunday, March 7, 2021 9:50 AM
To: SouthBendLathe@groups.io
Subject: Re: [SouthBendLathe] Single Point Left Hand Threading

https://youtu.be/9P-Qqc0uGyM

Steve


-----Original Message-----
From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> On Behalf Of Steve Wells
Sent: Sunday, March 7, 2021 9:45 AM
To: SouthBendLathe@groups.io
Subject: Re: [SouthBendLathe] Single Point Left Hand Threading

Saving subject posts for the FTE webpage...:)

Correct, the SBL automatic feed screw machine threads at 0 degrees, straight in, in both directions, reversing the spindle and leadscrew direction on front and rear tool bit passes.
Another little strange fact, at the minor flat of the acme thread, the SBL print has a 0.010 depth square clearance cut. This is cut by the front "rougher bit" flank minor, which has this square flank extension profile.

Steve


-----Original Message-----
From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> On Behalf Of m. allan noah
Sent: Sunday, March 7, 2021 9:06 AM
To: SouthBendLathe@groups.io
Subject: Re: [SouthBendLathe] Single Point Left Hand Threading

On Sun, Mar 7, 2021 at 8:24 AM Guenther Paul <paulguenter@att.net> wrote:

You can through that book away American and metric thread is 60 degree not 58 you set the compound on 30 degree.
The British withworth thread is 55 degree

Sigh. Think about it. The angle of the compound in-feed does not set the angle of the thread- the shape of the tool does. The 29 degree thing is so you always cut a little on the back side, leaving a clean flank, but do the bulk of the cutting in a direction that keeps the backlash taken up in the compound. So, the angle does not matter at all. I thread with the cross feed going straight in, and don't touch the compound at all, regardless of handedness. I certainly don't make a 0 degree thread :)

allan

--
"well, I stand up next to a mountain- and I chop it down with the edge of my hand"


Re: Single Point Left Hand Threading

Steve Wells
 

-----Original Message-----
From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> On Behalf Of Steve Wells
Sent: Sunday, March 7, 2021 9:45 AM
To: SouthBendLathe@groups.io
Subject: Re: [SouthBendLathe] Single Point Left Hand Threading

Saving subject posts for the FTE webpage...:)

Correct, the SBL automatic feed screw machine threads at 0 degrees, straight in, in both directions, reversing the spindle and leadscrew direction on front and rear tool bit passes.
Another little strange fact, at the minor flat of the acme thread, the SBL print has a 0.010 depth square clearance cut. This is cut by the front "rougher bit" flank minor, which has this square flank extension profile.

Steve


-----Original Message-----
From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> On Behalf Of m. allan noah
Sent: Sunday, March 7, 2021 9:06 AM
To: SouthBendLathe@groups.io
Subject: Re: [SouthBendLathe] Single Point Left Hand Threading

On Sun, Mar 7, 2021 at 8:24 AM Guenther Paul <paulguenter@att.net> wrote:

You can through that book away American and metric thread is 60 degree not 58 you set the compound on 30 degree.
The British withworth thread is 55 degree

Sigh. Think about it. The angle of the compound in-feed does not set the angle of the thread- the shape of the tool does. The 29 degree thing is so you always cut a little on the back side, leaving a clean flank, but do the bulk of the cutting in a direction that keeps the backlash taken up in the compound. So, the angle does not matter at all. I thread with the cross feed going straight in, and don't touch the compound at all, regardless of handedness. I certainly don't make a 0 degree thread :)

allan

--
"well, I stand up next to a mountain- and I chop it down with the edge of my hand"

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