Good source of gear to make threading attachment for lathe

[John AitkenParticipant @johnaitken84086]

I have an Emco Unimat 3 lathe that I’m trying to make a screw threading attachment for. Specifically for ever four turns the work piece does I want the lead screw to do one turn. 4 threads per mm.

To do this I’d like a scours of high quality gears with a wide range of teeth numbers so can anyone recommend a good source?

Thank you

[John AitkenParticipant @johnaitken84086]

[Michael Cox 1Participant @michaelcox1]

Try here:

https://www.technobotsonline.com/

I have sourced gears/ timing belt pulleys etc from this company. Fast efficient service and good prices.

Just a satisfied customer.

Mike

[BazyleParticipant @bazyle]

Get a set of gears for a mini lathe from one of the usual lathe suppliers. That way they will have the right range and values.

[Jim NicParticipant @jimnic]

I'll be interested to see how you arrange the gears to drive your leadscrew on a Unimat 3.

The U3 I have has no mechanical connection between headstock mandrel and leadscrew. The only drive I have seen is a mechanism which connects to the end of the leadscrew and takes it's drive via a rubber belt off the motor pulley as a means of feeding the crosslide, but that has a fixed ratio.

Jim

[Thor 🇳🇴Participant @thor]

Posted by Jim Nic on 26/03/2018 20:30:56:

I'll be interested to see how you arrange the gears to drive your leadscrew on a Unimat 3.

……

Jim

May be something like this or this? The Taig is a bit different from the Unimat 3 of course.

Thor

Edited By Thor on 27/03/2018 04:55:47

[Mark RandParticipant @markrand96270]

To answer Chris's original question. HPC gears are good quality and have a wide range.

Edited By Mark Rand on 27/03/2018 09:07:44

[Cornish JackParticipant @cornishjack]

I have 3 Unimats (don't ask!) one of which is set up solely for screw cutting with about 20 or so threading sets. It is a very good system in use and I think some sort of 'home-brew' copy would be preferable to a method relying on lead screw drive. The Unimat system does ensure exact repeatability.

rgds

Bill

[John AitkenParticipant @johnaitken84086]

Posted by Mark Rand on 27/03/2018 09:07:27:

To answer Chris's original question. HPC gears are good quality and have a wide range.

Edited By Mark Rand on 27/03/2018 09:07:44

Thank. They seem to have a good suply of all the teeth numbers I could ever want. I'll go with them.

I’m not buying the original Unimat attachment because it is out of stock everywhere and it doesn’t do the threading I need. If I make my own I will have a larger selection of thread I can make, it will be cheaper and I will have gained some skill I would not otherwise of had.

[Jim NicParticipant @jimnic]

Good for you Chris. As I said, I would be interested to see how you do it (and I wasn;'t being facetious) so I hope you can enlighten us when you have completed it, perhaps by updating this thread.

Jim

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