127t Gear With ⅞” Shaft and Keyway – Which Lathe?

127t Gear With ⅞” Shaft and Keyway – Which Lathe?

This topic has 6 replies, 7 voices, and was last updated 1 November 2026 at 16:53 by noel shelley.

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1 November 2026 at 11:30 #872262
Captain Barnacles
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@captainbarnacles
Hello All,

I was rummaging through my workshop this morning in an effort to “thin out” and came across a 127t change gear. I can’t remember where I got it and I’ve never used it so I thought I’d offer it up for sale here but before I do I wondered if you might help me ifdentify which lathes it might suit please?

It is approximately 9 ⅛” diameter (233mm), ⅞” shaft diameter, ¼” wide key x ⅛” deep and the gear is ¾” thick. It has 127T cast on the face.

Many thanks.
Advert

1 November 2026 at 12:56 #872296
DC31k
Participant
@dc31k
The most important pointer to which machine it may or may not belong is the DP or module of the gear, which you do not provide.

A 14DP gear with 127t would be 234mm OD. For more confidence in identifying it, please measure the OD in a way that does not require the ‘approximate’ qualification.

Colchester are known to have used this DP number.

If you are passing it on to another who may have use for it, the pressure angle would also need to be known. This can be determined by measuring tooth span or by printing out a paper template and comparing.
1 November 2026 at 15:12 #872307
Dave Halford
Participant
@davehalford22513
Wasn’t a 127 wheel part of the Myford metric conversion?
1 November 2026 at 15:22 #872308
ega
Participant
@ega
On 1 November 2026 at 15:12 Dave Halford Said:

Wasn’t a 127 wheel part of the Myford metric conversion?

Off the cuff, no!
1 November 2026 at 15:48 #872309
Clive Brown 1
Participant
@clivebrown1
I think Myford offered a 127T wheel, but it’s not common. It’s size means it won’t fit in the standard gear-wheel cover and it’s quite pricey. An approximation using smaller wheels was more usual. 63T and 21T spring to mind as drivers I think.
1 November 2026 at 16:24 #872312
Howard Lewis
Participant
@howardlewis46836
It is too big to be for a Myford.

Being a 20 DP gear that would be 6.45″ OD, 5/8″ bore and 3/8″ thick, from memory.

At 9.125″ OD it looks like a 14 DP gear, so looks like for a lathe that uses 14 DP changewheels

Howard
1 November 2026 at 16:53 #872316
noel shelley
Participant
@noelshelley55608
Myford did offer a 127 gear but it was not part of the metric conversion. Noel.
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