By continuing to use this site, you agree to our use of cookies. Find out more
Forum sponsored by:
Forum sponsored by Allendale Jan 24th

Unknown Changewheels

All Topics | Latest Posts

Search for:  in Thread Title in  
Martin Cargill05/07/2020 14:29:29
137 forum posts

I recently bought a couple of boxes of machine "junk". In amongst all of the bits and pieces appear to be two sets of lathe gear wheels. They are of a strange design and have two pins that provide drive. Anyone have any idea of what machine they might belong to?

Martin

not done it yet05/07/2020 14:37:45
4739 forum posts
16 photos

DP, axle size, pin size and radius might be good for identification or ‘removal from the equation’.

Pete Rimmer05/07/2020 15:10:10
734 forum posts
50 photos
Posted by Martin Cargill on 05/07/2020 14:29:29:

I recently bought a couple of boxes of machine "junk". In amongst all of the bits and pieces appear to be two sets of lathe gear wheels. They are of a strange design and have two pins that provide drive. Anyone have any idea of what machine they might belong to?

Martin

They are quite possibly Drummond gears. Quite popular though I never understood why.

Howard Lewis05/07/2020 16:21:55
3375 forum posts
2 photos

If you can tell: Bore size, Outside diameter - inches and mm, number of teeth, and thickness, it will help.

At the moment everyone is wondering how long is your particular piece of string!.

These details will allow the DP of the gears to be calculated.

Knowing the DP, the bore and the thickness (Tooth width and centre/hub thickness ), others on here may be able to make a better estimate of what machine the gears may suit.

Howard

Martin Cargill05/07/2020 16:41:18
137 forum posts

Just measured one of them, all measurements are imperial

3.36 diameter

45 teeth

0.625 bore

two pin holes 0.18 and 0.2 diameter

inside to inside pin holes 0.77

outside to outside pin holes 1.15

didn't measure the thickness but I would guess at 0.5

Martin

David George 105/07/2020 16:55:13
avatar
1259 forum posts
438 photos

I am almost sure that they are Drummond gears. They are probably a missing set or two. Well sort after by people who buy a lathe with non of only some gears.

DAVID

Pete Rimmer05/07/2020 16:58:46
734 forum posts
50 photos

Sound like Drummond. I think one hole is straight, the other tapered.

Anyway, they should sell well.

DC31k05/07/2020 17:05:04
212 forum posts
Posted by Pete Rimmer on 05/07/2020 15:10:10:
They are quite possibly Drummond gears. Quite popular though I never understood why.

Because they are 14DP and this size is difficult to find and difficult to find good quality cutters for making them. Used on Chipmaster, early Colchester (maybe Student & Master), Harrison L5 and derivatives (e.g. 140).

Howard Lewis05/07/2020 17:07:12
3375 forum posts
2 photos

The DP calculates as 13.98, so 14 DP. So with two driving pins they are certainly not for a Myford.

Don't know the Drummond, but sounds a distinct possibility

Howard

not done it yet05/07/2020 18:07:37
4739 forum posts
16 photos

Raglan also used 14DP and 5/8” bore. If original, I would expect them to have part numbers embossed on the casting.

Martin Cargill07/07/2020 21:20:33
137 forum posts

Thank you for all of your thoughts and information gentlemen.

I've been out in the workshop tonight giving the gears a clean up to see what was there. There are four new ( still in bags) 3/4" wide gears that are marked L5 so I assume these are Harrison. There are twelve gears with the double pin holes that I assume are Drummond and two gears without pin holes that I'm guessing are Raglan these are all 1/2" wide. All have the same 14 DP.

Martin

Nigel Graham 207/07/2020 23:40:03
667 forum posts
15 photos

I would concur with that L5 marking probably indicating "Harrison" as I own an L5.

There seem still to be a lot of Drummond lathes about, so finding a new home for those wheels should not be too difficult.

I'd be interested in the "L5" ones subject to fuller cross-identifying, if they don't suit any of your machines, as the set with my lathe seems incomplete.

All Topics | Latest Posts

Please login to post a reply.

Magazine Locator

Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!

Find Model Engineer & Model Engineers' Workshop

Latest Forum Posts
Support Our Partners
Warco
ChesterUK
Eccentric July 5 2018
EngineDIY
Allendale Electronics
cowells
emcomachinetools
Eccentric Engineering
Subscription Offer

Latest "For Sale" Ads
Latest "Wanted" Ads
Get In Touch!

Do you want to contact the Model Engineer and Model Engineers' Workshop team?

You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.

Click THIS LINK for full contact details.

For subscription issues please see THIS LINK.

Digital Back Issues

Social Media online

'Like' us on Facebook
Follow us on Facebook

Follow us on Twitter
 Twitter Logo

Pin us on Pinterest