Gear set for M13x1
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# Thread: Gear set for M13x1

1. Plastic
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## Gear set for M13x1

I have an older Atlas craftsman 10127440 and am wanting to thread M13x1. The question i have is what gear combo do i need or how do i figure this out?
I know i need a 127 and 100 to convert the sae lead screw to metric.

2. RWO
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You need to ask this question here: General

RWO

3. Titanium
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Thinkee Atlas Craftsman is a bit of a no no over there.Im thinkee a hobby machining forum with a dedicated Craftsman spot might be less traumatic to the OP.............incidentally ,any old machining book will have a formula for calculating any lead ,and in this day and age ,we wont make mistakes with the arithmetic ,cause we will use a calculator.

4. You'd jump way ahead on viability of your threads at Practical Machinist if you omit the A and C word as to make of lathe

If you know you need the 1.27 : 1 compound, then a tiny bit of math will show you that 20 TPI (which is .050" lead) gets you a.03937" lead which is ONE MM for your M13

To show the simple math:

.050 / 1.27 = .03937

And by extension... 10 TPI gets you 2mm and 40 TPI gets you a half a mm....among others
Last edited by johnoder; 04-26-2019 at 09:22 AM.

5. Stainless
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If you look in the machinist handbook it will give the formulas to calculate any metric or inch threads on any lathe.

6. Stainless
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A more reasonable sized set of gears to get you close enough. There's another that is very close as well.

7. Diamond
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1964
hell, if it's a short thread work out the lead for say,24 or 26tpi...

8. Titanium
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1 mm pitch is 25.4 TPI so 25 TPI would be better if your machine will do it.

9. Diamond
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1964
since the Atlas gearbox includes 30tpi you can use 52/44 in place of the 48/48 gear set to have all the common metric pitches.

sacifices only the coarsest range of threads and is cheap an easy...slide a gear and adjust banjo.

there is an explanation on the lathes uk site.

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