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Drummond vs Myford change gears

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Ady108/06/2021 09:36:08
4726 forum posts
714 photos

I've never come across proper Drummond change gears until recently and they are absolutely massive compared to the Myford gears I have been using over the last 10 years

About 50% thicker than myford ones they look more like the gears out of a gearbox from a car and have a very solid run-all-day industrial look about them

Lee Rogers08/06/2021 10:22:49
142 forum posts

The small Drummond lathes (apart fron the Roundbed) were military spec industrial lathes . The Myford ML 1,2,3,4, series were all hobby machines built to a price. The Myford M Type being the exception because it was a Drummond design. The M Type is built like a brick s/h compared to an ML7 and the cost of manufacturing the M was what prompted the introduction of the more more versatile but built to a price ML7.

geoff walker 108/06/2021 12:55:15
461 forum posts
180 photos

I've never come across proper Drummond change gears until recently and they are absolutely massive compared to the Myford gears I have been using over the last 10 years

Ady, in 10 years you've never seen genuine drummond gears? Unusual to buy and own a drummond with no standard gears? There are usually a few in tow.

Totally agree with Lee's comments. The Myford/drummond M type has 3 faults, 1 and 2 the spindle and tailstock barrel are too small, the spindle bore is too small and both have 1 morse tapers and 3 the rack feed with the single gear is operates the "wrong way". (CR*P) The last one is easy to remedy but 1 and 2 requires some serious engineering. Other than that it beats the ml7 hands down, but of course that is not reflected in second hand lathe prices

old mart08/06/2021 18:02:20
3345 forum posts
208 photos

When I was looking for changewheels for the Smart & Brown model A lathe, I bought a single Myford one to see if they were similar, as they are relatively easy to get hold of. Unfortunately, a 127 tooth Myford gear would have been much too large in diameter to fit. The S&B gears are very fine pitch, visually similar compared to a Myford gear as the Myford compares to the Drummond. I have replaced all of the S&B change wheels with MOD1 metric pitch wheels as they are easy to get hold of, and also because I got hold of a 125-127 MOD1 gear cheaply which was for some Chinese lathe.

Changewheels do not have much power going through them, so there is no need for them to be huge.

Pete Rimmer08/06/2021 19:03:51
1069 forum posts
69 photos

Drummond gear teeth are that big because if they were any smaller they'd lose teeth. They come from an era before advances in cast iron metallurgy made it as versatile as it is today.

I'm not saying they couldn't do it for higher-end machines etc but I think that the £5 lathe budget stretched to more iron but not more technology. It's common to see busted teeth on lathes of this era, these days not so much.

Lee Rogers09/06/2021 18:40:40
142 forum posts

Something to remember is that if your compounding gears you can mix them up . I have a 16t gear that is smaller than the smallest Drummond 20t , I match it to a gear of the same dp that is compounded with a Drummond gear, great for a fine feed.

Martin Kyte09/06/2021 19:14:11
2558 forum posts
45 photos

Are they not different pressure angles ? I thought Drummond was 14.5 degrees and Myford 20.

regards Martin

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