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Are the gears made of nylon, PLA or ABS?
From: SouthBendLathe@groups.io <SouthBendLathe@groups.io> on behalf of William Nelson <wnnelson@...>
Sent: Tuesday, August 2, 2022 9:48:18 AM
To: SouthBendLathe@groups.io <SouthBendLathe@groups.io>
Subject: Re: [SouthBendLathe] Minimum Number of Change Gears
I have that set from Ebay. I have had occasion to cut metric threads twice with them. They worked fine. There are some shims to allow you to line up the gears but found them insufficient and made some of my own. The maker says he runs his gears all the
time and has no issues except swarf getting embedded in the plastic. I'm happy with mine and payed more than the current price. He will answer questions.
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Bill From Socal
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I have that set from Ebay. I have had occasion to cut metric threads twice with them. They worked fine. There are some shims to allow you to line up the gears but found them insufficient and made some of my own. The maker says he runs his gears all the time and has no issues except swarf getting embedded in the plastic. I'm happy with mine and payed more than the current price. He will answer questions.
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Bill From Socal
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That's a great help thanks very much
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You might want to consider joining this group and take a look at how simple it is to add a stepper motor+driver and a 1 pulse per rev sensor to get all the threads you want. It was for old lathes missing gears that this project was originally done. https://groups.io/g/E-Leadscrew Attached is a photo of how I coupled a stepper motor to my Heavy 10L lead screw. I just disengage the gear box selector leaver and the forward reverse leaver. Haven't used the gears in probably 10 years. John Dammeyer
From: SouthBendLathe@groups.io [mailto:SouthBendLathe@groups.io] On Behalf Of benjithestupiddog via groups.io
Sent: August-01-22 2:58 AM
To: SouthBendLathe@groups.io
Subject: [SouthBendLathe] Minimum Number of Change Gears Hi all,
Quick opinion question.
I'm 3D printing a set of change gears as a bit of an experiment, the cost is low but its quite a bit of time to invest
I know very little about actually using change gears so this might be a redundant question, but is there a minimum number of gears one could "get by" with assuming I only wanted UNF/UNC in 1/8" - 1/2" diameters and maybe pushing my luck with some metric, I have already done the cad for an 80/63T
Buying premade gears in my country is very expensive, prohibitively so, also making them is beyond my current ability.
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Make a light pass with a sharp tool & then measure
with a thread gauge to see what your setup for now . If your lathe
is like most lathes ( we don't know what lathe you have ) there
should
be a spare gear stacked on top of a larger gear that
makes no contact with any other gear . That gear is one of the
gears that you will have to change depending what thread your
trying to cut .
Have you looked over on thingverse or printables dot com
to see if anyone has posted the files to print these gears ?
animal
On 8/1/2022 2:58 AM, benjithestupiddog
via groups.io wrote:
toggle quoted message
Show quoted text
Hi all,
Quick opinion question.
I'm 3D printing a set of change gears as a bit of an experiment,
the cost is low but its quite a bit of time to invest
I know very little about actually using change gears so this might
be a redundant question, but is there a minimum number of gears
one could "get by" with assuming I only wanted UNF/UNC in 1/8" -
1/2" diameters and maybe pushing my luck with some metric, I have
already done the cad for an 80/63T
Buying premade gears in my country is very expensive,
prohibitively so, also making them is beyond my current ability.
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eddie.draper@btinternet.com
I've now found Colchester's patented list of metric gearing for an Imperial leadscrew in Model Engineer, letters section, 6 - 19 April, 1979. It is listed like this:
6 (headstock mandrel) 8 7 11 12 19 (leadscrew)
This claims to provide a very close 2.5mm pitch from a 4 tpi leadscrew. I thought I would check that so I set Excel on the case (attached) and it comes out at 2.500068 mm. Feel free to download it for yourself & have a play.
Pretty obviously, with different tpi leadscrews, you would just get proportionately different pitches, so if you had 8 tpi, you'd get 1.25mm pitch. It can be speeded up & down by using multiples of those tooth numbers, although I would hesitate to suggest that any of them might be found in a standard set of any sort!
Eddie
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Show quoted text
------ Original Message ------
From: "Edward Draper" <eddie.draper@...>
To: SouthBendLathe@groups.io
Sent: Monday, 1 Aug, 22 At 13:34
Subject: Re: [SouthBendLathe] Minimum Number of Change Gears
Just talking about Imperial tpis: Consider whether you might want to cut 19tpi, which gets you 3/8" BSP threads, and isn't on the gearbox range of the standard 14.5" SB we have (NPT is not 19).
Similarly, 1" BSP is 11 tpi, and 1" NPT is the rather absurd 11.5 tpi, not found on older British lathes, but present on the SB.
I've found in some old magazines a listing for a set of metric transposing gears patented by Colchester, and will copy type those for a post later. It's just a single set and you need to use multiples of the tooth counts for different pitches.
Cheers,
Eddie
------ Original Message ------
From: "Mark R. Jonkman" <mark.jonkman@...>
To: SouthBendLathe@groups.io
Sent: Monday, 1 Aug, 22 At 12:48
Subject: Re: [SouthBendLathe] Minimum Number of Change Gears
Change gears don’t care about diameter- they care about threads per inch and feed rates. If you only want the thread pitches listed you could use the change gear chart to determine which gears you need. I’d hazard to guess that you will probably need the full set to get there. But there may be a couple outliers you may not need. It’s a question you can best answer yourself with the chart.
Metric is a whole separate issue and probably involves another complete set of gears. Someone had a spreadsheet with various gear setups that estimated very close to metric sizes. You might look that up and see what it says
Mark
On Aug 1, 2022, at 5:58 AM, benjithestupiddog via groups.io <benjithestupiddog@...> wrote:
Hi all,
Quick opinion question.
I'm 3D printing a set of change gears as a bit of an experiment, the cost is low but its quite a bit of time to invest
I know very little about actually using change gears so this might be a redundant question, but is there a minimum number of gears one could "get by" with assuming I only wanted UNF/UNC in 1/8" - 1/2" diameters and maybe pushing my luck with some metric, I have already done the cad for an 80/63T
Buying premade gears in my country is very expensive, prohibitively so, also making them is beyond my current ability.
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My thoughts...
0) Unless you aren't going to have ongoing use of the printer you
don't have to print them all up front.
1) Start by printing the gears for TPIs that you anticipate a
need for in the short term.
2) Print gears that you don't have as needs come up.
3) when the printer is idle print gears that you don't have yet
in some sort of priority order.
On 8/1/22 09:22, Glenn N wrote:
toggle quoted message
Show quoted text
You might find some useful info here, I have this gear set, they
appear well finished, but honestly I have not used them to date.
https://www.ebay.ca/itm/124387115378?hash=item1cf60cc172:g:qSIAAOSwEkxfiDGz
Just talking about Imperial
tpis: Consider whether you might want to cut 19tpi, which
gets you 3/8" BSP threads, and isn't on the gearbox range
of the standard 14.5" SB we have (NPT is not 19).
Similarly, 1" BSP is 11 tpi, and 1" NPT is the rather
absurd 11.5 tpi, not found on older British lathes,
but present on the SB.
I've found in some old magazines a listing for a set
of metric transposing gears patented by Colchester,
and will copy type those for a post later. It's just a
single set and you need to use multiples of the tooth
counts for different pitches.
Cheers,
Eddie
------ Original Message ------
From: "Mark R. Jonkman" <mark.jonkman@...>
To: SouthBendLathe@groups.io
Sent: Monday, 1 Aug, 22 At 12:48
Subject: Re: [SouthBendLathe] Minimum Number of Change Gears
Change gears don’t care about diameter- they care about threads per inch and feed rates. If you only want the thread pitches listed you could use the change gear chart to determine which gears you need. I’d hazard to guess that you will probably need the full set to get there. But there may be a couple outliers you may not need. It’s a question you can best answer yourself with the chart.
Metric is a whole separate issue and probably involves another complete set of gears. Someone had a spreadsheet with various gear setups that estimated very close to metric sizes. You might look that up and see what it says
Mark
Hi all,
Quick opinion question.
I'm 3D printing a set of change gears as a bit of an experiment, the cost is low but its quite a bit of time to invest
I know very little about actually using change gears so this might be a redundant question, but is there a minimum number of gears one could "get by" with assuming I only wanted UNF/UNC in 1/8" - 1/2" diameters and maybe pushing my luck with some metric, I have already done the cad for an 80/63T
Buying premade gears in my country is very expensive, prohibitively so, also making them is beyond my current ability.
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You might find some useful info here, I have this gear set, they appear well finished, but honestly I have not used them to date.
On Aug 1, 2022, at 8:34 AM, eddie.draper@... via groups.io <eddie.draper@...> wrote:
Just talking about Imperial tpis: Consider whether you might want to cut 19tpi, which gets you 3/8" BSP threads, and isn't on the gearbox range of the standard 14.5" SB we have (NPT is not 19).
Similarly, 1" BSP is 11 tpi, and 1" NPT is the rather absurd 11.5 tpi, not found on older British lathes, but present on the SB.
I've found in some old magazines a listing for a set of metric transposing gears patented by Colchester, and will copy type those for a post later. It's just a single set and you need to use multiples of the tooth counts for different pitches.
Cheers,
Eddie
------ Original Message ------
From: "Mark R. Jonkman" <mark.jonkman@...>
To: SouthBendLathe@groups.io
Sent: Monday, 1 Aug, 22 At 12:48
Subject: Re: [SouthBendLathe] Minimum Number of Change Gears
Change gears don’t care about diameter- they care about threads per inch and feed rates. If you only want the thread pitches listed you could use the change gear chart to determine which gears you need. I’d hazard to guess that you will probably need the full set to get there. But there may be a couple outliers you may not need. It’s a question you can best answer yourself with the chart.
Metric is a whole separate issue and probably involves another complete set of gears. Someone had a spreadsheet with various gear setups that estimated very close to metric sizes. You might look that up and see what it says
Mark
On Aug 1, 2022, at 5:58 AM, benjithestupiddog via groups.io <benjithestupiddog@...> wrote:
Hi all,
Quick opinion question.
I'm 3D printing a set of change gears as a bit of an experiment, the cost is low but its quite a bit of time to invest
I know very little about actually using change gears so this might be a redundant question, but is there a minimum number of gears one could "get by" with assuming I only wanted UNF/UNC in 1/8" - 1/2" diameters and maybe pushing my luck with some metric, I have already done the cad for an 80/63T
Buying premade gears in my country is very expensive, prohibitively so, also making them is beyond my current ability.
|
|
|
eddie.draper@btinternet.com
Just talking about Imperial tpis: Consider whether you might want to cut 19tpi, which gets you 3/8" BSP threads, and isn't on the gearbox range of the standard 14.5" SB we have (NPT is not 19).
Similarly, 1" BSP is 11 tpi, and 1" NPT is the rather absurd 11.5 tpi, not found on older British lathes, but present on the SB.
I've found in some old magazines a listing for a set of metric transposing gears patented by Colchester, and will copy type those for a post later. It's just a single set and you need to use multiples of the tooth counts for different pitches.
Cheers,
Eddie
toggle quoted message
Show quoted text
------ Original Message ------
From: "Mark R. Jonkman" <mark.jonkman@...>
To: SouthBendLathe@groups.io
Sent: Monday, 1 Aug, 22 At 12:48
Subject: Re: [SouthBendLathe] Minimum Number of Change Gears
Change gears don’t care about diameter- they care about threads per inch and feed rates. If you only want the thread pitches listed you could use the change gear chart to determine which gears you need. I’d hazard to guess that you will probably need the full set to get there. But there may be a couple outliers you may not need. It’s a question you can best answer yourself with the chart.
Metric is a whole separate issue and probably involves another complete set of gears. Someone had a spreadsheet with various gear setups that estimated very close to metric sizes. You might look that up and see what it says
Mark
On Aug 1, 2022, at 5:58 AM, benjithestupiddog via groups.io <benjithestupiddog@...> wrote:
Hi all,
Quick opinion question.
I'm 3D printing a set of change gears as a bit of an experiment, the cost is low but its quite a bit of time to invest
I know very little about actually using change gears so this might be a redundant question, but is there a minimum number of gears one could "get by" with assuming I only wanted UNF/UNC in 1/8" - 1/2" diameters and maybe pushing my luck with some metric, I have already done the cad for an 80/63T
Buying premade gears in my country is very expensive, prohibitively so, also making them is beyond my current ability.
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Fair enough, thanks for the reply, I just hoped there was some magic number the covered most bases.
I'm also terrible with imperial threads being a child of the metric system, maybe I should just work out what I need for metric and call that done as it 80% of what I use anyway.
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Change gears don’t care about diameter- they care about threads per inch and feed rates. If you only want the thread pitches listed you could use the change gear chart to determine which gears you need. I’d hazard to guess that you will probably need the full set to get there. But there may be a couple outliers you may not need. It’s a question you can best answer yourself with the chart.
Metric is a whole separate issue and probably involves another complete set of gears. Someone had a spreadsheet with various gear setups that estimated very close to metric sizes. You might look that up and see what it says
Mark
On Aug 1, 2022, at 5:58 AM, benjithestupiddog via groups.io <benjithestupiddog@...> wrote:
Hi all,
Quick opinion question.
I'm 3D printing a set of change gears as a bit of an experiment, the cost is low but its quite a bit of time to invest
I know very little about actually using change gears so this might be a redundant question, but is there a minimum number of gears one could "get by" with assuming I only wanted UNF/UNC in 1/8" - 1/2" diameters and maybe pushing my luck with some metric, I have already done the cad for an 80/63T
Buying premade gears in my country is very expensive, prohibitively so, also making them is beyond my current ability.
|
|
|
Hi all,
Quick opinion question.
I'm 3D printing a set of change gears as a bit of an experiment, the cost is low but its quite a bit of time to invest
I know very little about actually using change gears so this might be a redundant question, but is there a minimum number of gears one could "get by" with assuming I only wanted UNF/UNC in 1/8" - 1/2" diameters and maybe pushing my luck with some metric, I have already done the cad for an 80/63T
Buying premade gears in my country is very expensive, prohibitively so, also making them is beyond my current ability.
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