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Back Gear

Does a Kerry 1324 Lathe have a Back Gear

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malcolm hollins28/12/2021 08:20:34
34 forum posts
20 photos

I have a Kerry 1324 lathe and I was wondering does it have a Back Gear?

Andrew Johnston28/12/2021 08:59:42
6574 forum posts
701 photos

Not in the conventional sense. It's an all geared headstock so it doesn't need one. The headstock gearing ensures that full power is available at all spindle speeds.


Ady128/12/2021 09:57:29
5065 forum posts
734 photos

Backgear is a single shot change down system, usually about 6-1

So its a cheap compromise geared head system

larry phelan 128/12/2021 11:16:12
1169 forum posts
15 photos

As in my Chinese lathe, still, it works well enough with 12 speeds.wink

Nigel McBurney 128/12/2021 11:17:05
999 forum posts
3 photos

Back gear was initially not a cheap compromise geared head system,back gears were in use many many years before geared heads. Engineering lathes and other machine tools were driven by flat belts,which cannot drive a machine tool spindle at low speeds and transmit sufficient power , so some means of positive drive was required,in early victorian machines sometimes worm drive was used and later on ,large lathes had the rear of faceplate fitted with an internal gear ring driven by a pinion,then the back gear came into use in later Victorian times,simple to make and maintain ,easy to lubricate due to the low speeds in use at the time with plain carbon steel tools,early milling machines also used back geared spindles. One problem was that lathe opearators tended to loose their fingers in the gears,one of the earliest factories acts was that back gearing had to be fitted with guards. Aso around this time the very early automtive transmissions went through the same development process of open belts,open gears,open chains . When higher speeds were required for HSS tooling,better lubricationwas also required so gear boxes were developed though the changes took a very long time no doubt due to cost, both the manufacturers factories tooling and what the customer would pay.

Martin Johnson 128/12/2021 12:45:10
144 forum posts
1 photos

The standard Kerry goes from 1500 down to 35 rpm (I am not next to mine, so that is from memory). You really wont need much more range than that.

There is a Kerry owners group (small but select) on Io groups for specialist help on this rare breed.


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