Change gears

Change gears

This topic has 8 replies, 6 voices, and was last updated 27 October 2017 at 09:57 by Yngvar F.

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26 October 2017 at 02:20 #323583
kevin barron
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@kevinbarron12390
I have hercus 260atm metric lathe set up to cut imperial would like to know metric change gear set iup it has gear box
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26 October 2017 at 02:20 #8929
kevin barron
Participant
@kevinbarron12390
Hercus 260atm metric lathe
26 October 2017 at 06:38 #323585
John Ockleshaw 1
Participant
@johnockleshaw1
Hello Kevin, Here are the gears for metric pitches. They will suit you if your lead-screw is 8 TPI.

Regards, John
26 October 2017 at 07:09 #323587
John Ockleshaw 1
Participant
@johnockleshaw1
This may be more easily read Kevin
26 October 2017 at 23:52 #323806
kevin barron
Participant
@kevinbarron12390
My leadscrew is metric 3mm but change gears set up to cut imperial need gears for metric with quick change gearbox
27 October 2017 at 00:36 #323810
Jens Eirik Skogstad 1
Participant
@jenseirikskogstad1
Kevin,.. you can download the program for calculating the change gear if pitch of the lead screw and a set of change gear is known and the threading size is selected to create threads.

Go to this link –> **LINK** and download the program –> NthreadsP

and if your lathe has a screwcutting gearbox —> BoxfthreadP
27 October 2017 at 08:33 #323837
Hopper
Participant
@hopper
You might find some charts on one of the South Bend lathe sites, yahoo group or even the SB section on Home Shop Machinist forum. Pretty sure as Hercus copied SB to a tee the gearing would be the same.

Hercus are still in business and still reconditioning the 260s so they could probably tell you. And there is a very enthusiastic fellow selling parts for the older Herci who might be able to help too.Here **LINK**
27 October 2017 at 09:17 #323854
Robbo
Participant
@robbo
Kevin

This chart for gearbox and changewheel lathes may help, as well as Jens links.
27 October 2017 at 09:57 #323856
Yngvar F
Participant
@yngvarf
You need a 18t or 45t stud gear. A idler gear. usually 80t on South Bend clones. and a 60t screw gear.
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