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Identification of change wheels please

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JimmieS22/05/2018 21:04:56
310 forum posts
1 photos

gear change wheels.jpgCan anyone please identify these change wheels.

The course tooth set has a spindle hole dia of .875” (22mm ish), a wheel thickness of 1/2” and 8 splines– the set comprises 18, 30,33,35,42 and 45 (perhaps Colchester?)

The fine tooth set has a spindle hole dia of .900” (23mm ish) with a wheel thickness of around 9mm - not all are the same - and has 6 splines – the set comprises 40,42,44,45,52,56,60,80 and 96(?)

Edited By JimmieS on 22/05/2018 21:05:16

not done it yet22/05/2018 21:34:20
7517 forum posts
20 photos

Diameter with tooth count, or DP/MOD might help.

Emgee22/05/2018 21:39:05
2610 forum posts
312 photos

Before checking some I have to confirm I would say one style is from a Colchester Bantam.

Emgee

Edited By Emgee on 22/05/2018 21:40:58

Thor 🇳🇴23/05/2018 06:21:38
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1766 forum posts
46 photos

Hi Jimmie,

Colchester changewheels - as suggested by Emgee - were dicussed here, there is also a photo.

Thor

JimmieS25/05/2018 20:52:54
310 forum posts
1 photos

Many thanks to all who replied, especially Thor for directing me to an earlier posting.

Using the number of teeth/diameter formulae the course tooth set is 16DP which, according to the late Sir John is ‘early Colchester’s, round head etc 16 DP splined bore, some 6 some 8.’

The finer tooth wheel I get a 25DP and has 6 splines.I have checked the net without success for possible user. Anyone have thoughts?

Jim

not done it yet25/05/2018 23:44:54
7517 forum posts
20 photos

25DP/. That is unusual. I can’t recall a 25DP involute cutter. Possibly a metric gear?

JimmieS27/05/2018 15:43:19
310 forum posts
1 photos

Hi not done it yet.

Many thanks for the reply. When I checked several of this set the calculations came out between 25.2 and 25.5 with one at 25.8... I assume the deviations came from my measuring..Have rattled my memory I think (!) the set may have come from a 'shop which got a Boxford T series in the early 1980's. This would, of course, have been metric.

Jim

JimmieS19/06/2018 09:42:55
310 forum posts
1 photos

Apologies, just realised I forgot to post my reply from Boxford re above gears - 'they are from a manual X10 lathe'.And a '5 Star Award' to Gary B at Boxford for going to the trouble of finding out.

Thanks to all again.

Jim

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