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New member from Denmark

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John Rudd:
Hi Soren,

You know the alternative to the 127 tooth wheel is 21....( 6:1 ratio as near as dammit...)

Soren Hansen:
Hi John Ruud

I can't find the article right now, but have read if I use a 47/37 combo, I transform my leadscrew from a 8TPI to a 2,5mm pitch and the error is less than 0.015%, but then I have to buy the 47 and 37 gears.

Then again, if I was to use a 21 gear, my leadscrew would catapult the apron down the bed so fast it would need a airbag at both ends of it's travel, or do I misunderstand anything ?

Mind you I come from a total manual lathe like the one on this pic, but without the gearbox and changewheels

philf:
Soren,

This chart shows the configuration to use 21t gear(s) for metric threading.







No airbags necessary!

Hope this helps.

Cheers.

Phil.

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