Date   
Re: Cross slide and compound backlash

Steven H
 

Loosen up the gibs on compound and cross slide slightly and set up mag base and dial indicator on front or rear face of slides. Push and pull on slides, read wear on dial indicator at various positions on the screws. New nuts should improve the backlash. The nuts are bronze and meant to take the brunt of the wear rather than the screw.

Steve Haskell

On May 16, 2020, at 8:15 AM, houdini via groups.io <houdini969@...> wrote:


Matt, crossfeed nuts are on e-bay for the going price. i would start there and with the nut you can see if in fact the crossfeed screw is worn, or if budget permits buy one of the complete assy. 

On Saturday, May 16, 2020, 04:21:11 AM EDT, Matt R <mrissmiller@...> wrote:


I am in the process of tearing down, cleaning and seeing what needs replaceg on my SB 16/24. Is there a way to measure the nuts on the cross slide and compound to see how bad the wear is? I have the one screw out and can wiggle ithe nut 15 or 20 thou on the screw up and down and lengthwise. The screw looks to be in good shape on the entire length. So do I just need new nuts to get rid of the backlash?

Re: Cross slide and compound backlash

houdini
 

Matt, crossfeed nuts are on e-bay for the going price. i would start there and with the nut you can see if in fact the crossfeed screw is worn, or if budget permits buy one of the complete assy. 

On Saturday, May 16, 2020, 04:21:11 AM EDT, Matt R <mrissmiller@...> wrote:


I am in the process of tearing down, cleaning and seeing what needs replaceg on my SB 16/24. Is there a way to measure the nuts on the cross slide and compound to see how bad the wear is? I have the one screw out and can wiggle ithe nut 15 or 20 thou on the screw up and down and lengthwise. The screw looks to be in good shape on the entire length. So do I just need new nuts to get rid of the backlash?

Cross slide and compound backlash

Matt R
 

I am in the process of tearing down, cleaning and seeing what needs replaceg on my SB 16/24. Is there a way to measure the nuts on the cross slide and compound to see how bad the wear is? I have the one screw out and can wiggle ithe nut 15 or 20 thou on the screw up and down and lengthwise. The screw looks to be in good shape on the entire length. So do I just need new nuts to get rid of the backlash?

Re: cam tailstock lock modifications for SB13

Milan Trcka
 

For what is worth, on my SB 9A I am using an offset box wrench with the opposing end cut off and contoured. Exposed end is coated with PlastiDip. Works better than the original since the shank is narrower and allows for few more degrees of rotation. Old wrench which was (is) aluminum and all stretched out and kept falling off the nut and kept banging to the stops too soon.

Milan

Re: 10K Belt

carbure2003
 

I am using automotive serpentine belts, cut to length and then laced or joined with belt clipper clips.
It gives extremely good grip if pulleys are oil free
 
the Laced belt is on my 10K And the clipped belt on my 9A.
I laced the belt with a nylon braided twine about 1/32” dia. Lacing is done at the bottom of the groove and is virtually perfectly quiet.  The clipped belt is a little bit more noisy.
I used nylon braided twine about 1/32” dia for lacing. On the pulley side, lacing goes at the bottom of the groove.
lathe has been running like this for about 4 years.  
Guy
 


---------- Original Message ----------
From: "glenn brooks" <brooks.glenn@...>
To: SouthBendLathe@groups.io
Subject: Re: [SouthBendLathe] 10K Belt
Date: Wed, 13 May 2020 08:42:13 -0700

On our 10k at the RR museum, I replaced the drive belt off the motor with an industrial grade V belt from Napa.  The headstock belt is an automotive serpentine belt. 6 groove, maybe.  The serpentine belts work really well. Heavy duty v belts also. Sometimes these are called agriculture belts as they are used as replacements on farm equipment.  Green in color.

 
Glenn B.

 

On May 13, 2020, at 8:24 AM, Payson <egreene104@...> wrote:

Hi. What are people using for belts on 10K undermount?

Payson. 


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Re: cam tailstock lock modifications for SB13

Matt R
 

The best thing I ever did was make a left hand threaded lock down bolt. That and a 4 or 6 pitch thread would give a nice short throw and very tight clamping action.

Re: 10K Belt

glenn brooks
 

On our 10k at the RR museum, I replaced the drive belt off the motor with an industrial grade V belt from Napa.  The headstock belt is an automotive serpentine belt. 6 groove, maybe.  The serpentine belts work really well. Heavy duty v belts also. Sometimes these are called agriculture belts as they are used as replacements on farm equipment.  Green in color.

Glenn B.


On May 13, 2020, at 8:24 AM, Payson <egreene104@...> wrote:

Hi. What are people using for belts on 10K undermount?

Payson. 

10K Belt

Payson
 

Hi. What are people using for belts on 10K undermount?

Payson. 

Re: Looking for Heavy 10 or 13 near Long Island, NY

Rick
 

John, don’t know if you saw my message, but I’m interested. Thanks!

Re: Looking for Heavy 10 or 13 near Long Island, NY

Roger Bickers
 

Thanks for the reply John, we were on a dynamite crew together..I learned a lot from him, and would love to say hi and thanks. 


On Tue, May 12, 2020 at 10:13 AM, John Fischer
<n2nu@...> wrote:

Nope, sorry.  I did drive through it once.

 

-J

 

From: SouthBendLathe@groups.io [mailto:SouthBendLathe@groups.io] On Behalf Of Roger Bickers via groups.io
Sent: Monday, May 11, 2020 4:05 PM
To: SouthBendLathe@groups.io
Subject: Re: [SouthBendLathe] Looking for Heavy 10 or 13 near Long Island, NY

 

John did you ever live in Arkansas?  I used to work with a John Fischer and lost contact with him years ago. 

Roger 

 

On Mon, May 11, 2020 at 11:37 AM, Rick

<vwrick@...> wrote:

On Mon, May 11, 2020 at 10:53 AM, John Fischer wrote:

Rick I am in Central Jersey and have a Heavy 10 for sale, it is a later model Flame hardened ways in good shape.  If you want more details let me know and I will contact you off list.

 

Please contact me.

Thanks

Re: Looking for Heavy 10 or 13 near Long Island, NY

John Fischer
 

Nope, sorry.  I did drive through it once.

 

-J

 

From: SouthBendLathe@groups.io [mailto:SouthBendLathe@groups.io] On Behalf Of Roger Bickers via groups.io
Sent: Monday, May 11, 2020 4:05 PM
To: SouthBendLathe@groups.io
Subject: Re: [SouthBendLathe] Looking for Heavy 10 or 13 near Long Island, NY

 

John did you ever live in Arkansas?  I used to work with a John Fischer and lost contact with him years ago. 

Roger 

 

On Mon, May 11, 2020 at 11:37 AM, Rick

<vwrick@...> wrote:

On Mon, May 11, 2020 at 10:53 AM, John Fischer wrote:

Rick I am in Central Jersey and have a Heavy 10 for sale, it is a later model Flame hardened ways in good shape.  If you want more details let me know and I will contact you off list.

 

Please contact me.

Thanks

Re: cam tailstock lock modifications for SB13

a.earl1@sky.com
 

IF YOU WANT A TAILSTOCK WITH CAM ACTION FIT ONE FROM 41/2" BOXFORD  .YOU JUST HAVE TO SHIM IT TO GET HEIGHT RIGHT .WORKS PERFECTLY ON MY 9" SOUTHBEND

On Tuesday, 12 May 2020, 08:44:46 BST, Ondrej Krejci via groups.io <okrejci@...> wrote:


Kind of makes Mr Blue Chips Webb want to just make a spanner for his nut and forget all about some cam action stuff.....

On Monday, May 11, 2020, 07:24:50 PM EDT, Steven H via groups.io <stevesmachining@...> wrote:


I think we have beaten this poor horse to death. I believe this whole topic started with an Op wanting to know if anyone has installed a cam lock device for the tailstock. I have never attempted this on my Atlas or SB lathes. 

Steve Haskell


On May 11, 2020, at 7:04 PM, Davis Johnson <davis@...> wrote:



He is partially correct. There are two questions:

1) Can it be made to work? He has answered this perfectly. The thread merely needs to be coarse enough to tighten/loosen adequately given the available wrench motion.

2) What is the thickness shim required to make it work? This IS determined by the pitch of the screw. It may well be that sane way to find the shim thickness is by trial and error. Probably so. But the thickness that trial and error finds will have been mandated by the thread pitch and the range of tightness without the shim.

We must be bored out of our skulls today.


On 5/11/20 5:23 PM, wlw19958 wrote:
Hi There,

Actually, Jim is proving my point!  Yes, the thread pitch has to be
course enough but whether it is 16tpi, 14tpi, 12tpi doesn't matter.

Good Luck!
-Blue Chips-
Webb

Re: cam tailstock lock modifications for SB13

Ondrej Krejci
 

Kind of makes Mr Blue Chips Webb want to just make a spanner for his nut and forget all about some cam action stuff.....

On Monday, May 11, 2020, 07:24:50 PM EDT, Steven H via groups.io <stevesmachining@...> wrote:


I think we have beaten this poor horse to death. I believe this whole topic started with an Op wanting to know if anyone has installed a cam lock device for the tailstock. I have never attempted this on my Atlas or SB lathes. 

Steve Haskell


On May 11, 2020, at 7:04 PM, Davis Johnson <davis@...> wrote:



He is partially correct. There are two questions:

1) Can it be made to work? He has answered this perfectly. The thread merely needs to be coarse enough to tighten/loosen adequately given the available wrench motion.

2) What is the thickness shim required to make it work? This IS determined by the pitch of the screw. It may well be that sane way to find the shim thickness is by trial and error. Probably so. But the thickness that trial and error finds will have been mandated by the thread pitch and the range of tightness without the shim.

We must be bored out of our skulls today.


On 5/11/20 5:23 PM, wlw19958 wrote:
Hi There,

Actually, Jim is proving my point!  Yes, the thread pitch has to be
course enough but whether it is 16tpi, 14tpi, 12tpi doesn't matter.

Good Luck!
-Blue Chips-
Webb

Re: cam tailstock lock modifications for SB13

Steven H
 

I think we have beaten this poor horse to death. I believe this whole topic started with an Op wanting to know if anyone has installed a cam lock device for the tailstock. I have never attempted this on my Atlas or SB lathes. 

Steve Haskell


On May 11, 2020, at 7:04 PM, Davis Johnson <davis@...> wrote:



He is partially correct. There are two questions:

1) Can it be made to work? He has answered this perfectly. The thread merely needs to be coarse enough to tighten/loosen adequately given the available wrench motion.

2) What is the thickness shim required to make it work? This IS determined by the pitch of the screw. It may well be that sane way to find the shim thickness is by trial and error. Probably so. But the thickness that trial and error finds will have been mandated by the thread pitch and the range of tightness without the shim.

We must be bored out of our skulls today.


On 5/11/20 5:23 PM, wlw19958 wrote:
Hi There,

Actually, Jim is proving my point!  Yes, the thread pitch has to be
course enough but whether it is 16tpi, 14tpi, 12tpi doesn't matter.

Good Luck!
-Blue Chips-
Webb

Re: cam tailstock lock modifications for SB13

ww_big_al
 

This is being made too complicated. Get yourself several ½” flat washers (assuming ½” size) and put them on. If 3 is to many , and 2 are not enough then the thickness will be between 2 & 3 washer thicknesses.  About 2.5 washers. Clocking the square bolt may help also.

Al

 

From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> On Behalf Of Davis Johnson
Sent: Monday, May 11, 2020 7:05 PM
To: SouthBendLathe@groups.io
Subject: Re: [SouthBendLathe] cam tailstock lock modifications for SB13

 

He is partially correct. There are two questions:

1) Can it be made to work? He has answered this perfectly. The thread merely needs to be coarse enough to tighten/loosen adequately given the available wrench motion.

2) What is the thickness shim required to make it work? This IS determined by the pitch of the screw. It may well be that sane way to find the shim thickness is by trial and error. Probably so. But the thickness that trial and error finds will have been mandated by the thread pitch and the range of tightness without the shim.

We must be bored out of our skulls today.

 

On 5/11/20 5:23 PM, wlw19958 wrote:

Hi There,

Actually, Jim is proving my point!  Yes, the thread pitch has to be
course enough but whether it is 16tpi, 14tpi, 12tpi doesn't matter.

Good Luck!
-Blue Chips-
Webb

Re: cam tailstock lock modifications for SB13

Davis Johnson
 

He is partially correct. There are two questions:

1) Can it be made to work? He has answered this perfectly. The thread merely needs to be coarse enough to tighten/loosen adequately given the available wrench motion.

2) What is the thickness shim required to make it work? This IS determined by the pitch of the screw. It may well be that sane way to find the shim thickness is by trial and error. Probably so. But the thickness that trial and error finds will have been mandated by the thread pitch and the range of tightness without the shim.

We must be bored out of our skulls today.


On 5/11/20 5:23 PM, wlw19958 wrote:
Hi There,

Actually, Jim is proving my point!  Yes, the thread pitch has to be
course enough but whether it is 16tpi, 14tpi, 12tpi doesn't matter.

Good Luck!
-Blue Chips-
Webb

Re: cam tailstock lock modifications for SB13

wlw19958
 

Hi There,

Actually, Jim is proving my point!  Yes, the thread pitch has to be
course enough but whether it is 16tpi, 14tpi, 12tpi doesn't matter.

Good Luck!
-Blue Chips-
Webb

Re: Looking for Heavy 10 or 13 near Long Island, NY

Roger Bickers
 

John did you ever live in Arkansas?  I used to work with a John Fischer and lost contact with him years ago. 
Roger 


On Mon, May 11, 2020 at 11:37 AM, Rick
<vwrick@...> wrote:
On Mon, May 11, 2020 at 10:53 AM, John Fischer wrote:

Rick I am in Central Jersey and have a Heavy 10 for sale, it is a later model Flame hardened ways in good shape.  If you want more details let me know and I will contact you off list.

 

Please contact me.

Thanks

Re: cam tailstock lock modifications for SB13

Andrei
 

Agreed. Jim is spot on the money. 


From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> on behalf of Jim_B <jim@...>
Sent: Monday, May 11, 2020 3:40 PM
To: SouthBendLathe@groups.io <SouthBendLathe@groups.io>
Subject: Re: [SouthBendLathe] cam tailstock lock modifications for SB13
 
Yes I agree the thread is relevant, but only to the extend that it must be coarse enough to do the job. 

A fine thread will not work. 

Let's say that we need 0.010” of space between the lower clamp and the underside rails of the bed for the tailstock to move properly. 

(Is that a good number? I don't know, I know on my beat up bed I would need more.)

I want that space to show up when I move the locking nut 1 flat, maybe 1-1/2 flats. Then one turn of the screw would move the nut 0.060”
Thats a 16.7 TPI thread. so anything less than 16.6 TPI will not work for the quick on/off use we are looking for. 

The washer thickness or position of the square nut would not matter, We would need more than 1 flat to get enough space. 
Now my SB-10L has a 13 TPI thread. Thats 0.077” per turn or about 0.013”  per flat. If your bed is in fair condition that should be enough, So   should 14 TPI, or 12 TPI or 10 TPI  and any usable thread coarser than 16.7.

A 20 TPI thread, OTOH will not work. It will lock down the tailstock but not in 1 flat. 

So, Yes the thread pitch is important as long as its coarse enough. 

On 11 May 2020, at 14:56, wlw19958 <wlw-19958@...> wrote:

Hi There,

Sorry I have to respectfully disagree.

Fine.  You can disagree.  I still maintain that the thread pitch is immaterial.  Of course
one can calculate the amount to decrease or increase based on the pitch but it doesn't
matter what the pitch is.  One can change the thickness to suit no matter what the pitch
is.  You are getting bogged down in the minutia that hasn't the constituent value of a
large pile of legumes.  You have to step back to see the larger picture. 

Good Luck!
-Blue Chips-
Webb

Jim B.





--
Jim B

Re: cam tailstock lock modifications for SB13

Jim_B
 

Yes I agree the thread is relevant, but only to the extend that it must be coarse enough to do the job. 

A fine thread will not work. 

Let's say that we need 0.010” of space between the lower clamp and the underside rails of the bed for the tailstock to move properly. 

(Is that a good number? I don't know, I know on my beat up bed I would need more.)

I want that space to show up when I move the locking nut 1 flat, maybe 1-1/2 flats. Then one turn of the screw would move the nut 0.060”
Thats a 16.7 TPI thread. so anything less than 16.6 TPI will not work for the quick on/off use we are looking for. 

The washer thickness or position of the square nut would not matter, We would need more than 1 flat to get enough space. 
Now my SB-10L has a 13 TPI thread. Thats 0.077” per turn or about 0.013”  per flat. If your bed is in fair condition that should be enough, So   should 14 TPI, or 12 TPI or 10 TPI  and any usable thread coarser than 16.7.

A 20 TPI thread, OTOH will not work. It will lock down the tailstock but not in 1 flat. 

So, Yes the thread pitch is important as long as its coarse enough. 

On 11 May 2020, at 14:56, wlw19958 <wlw-19958@...> wrote:

Hi There,

Sorry I have to respectfully disagree.

Fine.  You can disagree.  I still maintain that the thread pitch is immaterial.  Of course
one can calculate the amount to decrease or increase based on the pitch but it doesn't
matter what the pitch is.  One can change the thickness to suit no matter what the pitch
is.  You are getting bogged down in the minutia that hasn't the constituent value of a
large pile of legumes.  You have to step back to see the larger picture. 

Good Luck!
-Blue Chips-
Webb

Jim B.





--
Jim B