I particularly enjoy the recent Myford restoration articles

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I particularly enjoy the recent Myford restoration articles

This topic has 14 replies, 11 voices, and was last updated 21 August 2023 at 10:36 by Nick Hughes.

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5 July 2020 at 18:32 #484149
choochoo_baloo
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@choochoo_baloo
Feedback is always helpful, good or bad. As such I wanted to say that a highlight of my MEW subscription over the past 12 months or so have been the few Myford restoration articles by Peter Barker. As a self-taught home machinist, the thorough but unpretentious style bas been very informative. I've had many "oh so now that xx makes sense" reading them!

Niel Wyatt – I know you're a responsive Editor, so I thought it was worth mentioning the above.

I hope more maintenance type articles on the popular brand machines might be included in future editions. I expect they're quite popular. Particularly as COVID restrictions continue to ease.

All in all, a great magazine!
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5 July 2020 at 18:32 #38571
choochoo_baloo
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@choochoo_baloo
5 July 2020 at 23:46 #484191
Hopper
Participant
@hopper
Thanks. Glad you found the articles useful.

Have fun with your Myford.

Pete B.
5 July 2020 at 23:58 #484193
Simon Collier
Participant
@simoncollier74340
I used to resent all the stuff on Myfords in the magazines. Then a very nice Ml 7 fell into my lap for peanuts, so now I like the articles.
6 July 2020 at 01:42 #484200
Hopper
Participant
@hopper
Posted by Simon Collier on 05/07/2020 23:58:47:

I used to resent all the stuff on Myfords in the magazines. Then a very nice Ml 7 fell into my lap for peanuts, so now I like the articles.

Lol. Ain't that the way of it.

I got mine in a similar way — then found out why it was at close to scrap value price. I got exactly what i paid for!
20 August 2023 at 11:20 #657215
Paul Taylor
Participant
@paultaylor53031
Love the Myford restoration Thread.

I'm in Australia and restoring a Super 7 with a 1955 type quick change gearbox with external lead screw drive. I only have the pinion on the lead screw. Can anyone tell me the number of teeth on the gearbox and idler gears please.

An aside. The lathe was owned by author Neville Shuts!
20 August 2023 at 13:36 #657219
DC31k
Participant
@dc31k
Posted by Paul Taylor on 20/08/2023 11:20:15:

Can anyone tell me the number of teeth on the gearbox and idler gears please.

There are lots of Myford workshop manuals available for download from here:

http://vintagemachinery.org/mfgindex/detail.aspx?id=4654&tab=3
20 August 2023 at 14:35 #657223
Grindstone Cowboy
Participant
@grindstonecowboy
Posted by Paul Taylor on 20/08/2023 11:20:15:

Love the Myford restoration Thread.

I'm in Australia and restoring a Super 7 with a 1955 type quick change gearbox with external lead screw drive. I only have the pinion on the lead screw. Can anyone tell me the number of teeth on the gearbox and idler gears please.

An aside. The lathe was owned by author Neville Shuts!

Sorry, can't help with the question, but congratulations on owning a bit of history – one of my favourte authors, Trustee from the Toolroom being amongst his best work.

Rob
20 August 2023 at 16:01 #657227
JA
Participant
@ja
Posted by Paul Taylor on 20/08/2023 11:20:15:

Love the Myford restoration Thread.

I'm in Australia and restoring a Super 7 with a 1955 type quick change gearbox with external lead screw drive. I only have the pinion on the lead screw. Can anyone tell me the number of teeth on the gearbox and idler gears please.

An aside. The lathe was owned by author Neville Shuts!

According to my "Myford Super 7 Lathe Notes on Operation Installation and Maintenance also Pictorial Parts List" booklet, Fixed Cluster Gear 210 19/57 teeth, Reversible Cluster Gear 208 19/57 teeth, (Gear on gearbox shaft) 186 72 teeth. The bold numbers are diagram references.

While I think I have answered your question I feel that you may be slightly puzzled. A copy of the relevant pages will follow in a few minutes.

JA
20 August 2023 at 16:24 #657229
JA
Participant
@ja
Paul

As promised.

I am sure the quality of pictorial parts lists for Chinese lathes far surpass Myford's.

JA
21 August 2023 at 04:33 #657283
Paul Taylor
Participant
@paultaylor53031
Thanks for diagram. The problem is that the 1955 quick change gear box had the lead screw drive externally on the right hand side of the gearbox.

The gearbox drives a pinion.which drives an idler gear which drives a gear on the lead screw.

I have the gear on the leadscrew but don't know the number of teeth on the gearbox drive or idler.

I ha a photo but it's not clear enough to count the teeth.

Cheers Paul
21 August 2023 at 07:10 #657288
not done it yet
Participant
@notdoneityet
If you know the gear DP and tooth-count along with the centre to centre distance, the tooth count of the previous/subsequent gears are fairly easily calculated.

Edited By not done it yet on 21/08/2023 07:12:58
21 August 2023 at 07:34 #657290
Howard Lewis
Participant
@howardlewis46836
Since the changewheels on non gearbox Myfords are 20DP, 14.5 PA, it would seem likely that the same would be used for gears on the QCGB models.

If you want to learn more about the calculations, Ivan law's "Gears and Gear Cutting", No 17 in the Workshop Practice Series will be worth reading.

From this you can calculate the OD, and PCD of each gear, which should confirm the cenre distance.

Howartd
21 August 2023 at 07:35 #657291
JasonB
Moderator
@jasonb
You could also work it out by selecting say 8tpi and rotating the gearbox input by hand and measuring the rotation of the output. You can then calculate the gear ratio needed between box output and leadscrew. eg if one turn of the input = half a turn of the output then you need the leadscrew gear to have half the number of teeth as the output pinion.

Idler will simply be what fits between the PCD of the output and leadcrew gears.
21 August 2023 at 10:36 #657312
Nick Hughes
Participant
@nickhughes97026
The photo on here is clear enough to count the input gear teeth (I count 18) :-

lathes.co.uk

Also some taken during a rebuild here (about 7 min in):-

YouTube

Edited By Nick Hughes on 21/08/2023 10:52:37
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