Thread: Expression of interest

Hi Pipeclay
I would be interested in a 48 tooth change gear if bitza does'nt have any as I have already asked him
Les

Originally Posted by ljvs1951

Hi Pipeclay
I would be interested in a 48 tooth change gear if bitza does'nt have any as I have already asked him
Les

Hello ljvs1951,
It might be worth checking with Mick Moyle's in Sydney before you confirm your request to Pipeclay. Last visit there he had a 48T in stock, $20 IIRC.

Regards.

If anyone wants to cut metric threads here's a couple of very accurate approximations for the 127/100 tooth gear which are easier to make

63/80 - which gives 1.000125mm for 1mm

So a scew that is 6" long will have an accumulated lead error of just under 1 thou of an inch.

and

37/47 - which gives 0.999787 for 1mm

This is about half as accurate as the first one.

I have a 76/60 gear which gives 1.0026mm, far from the best approximation, this gives an accumulated error of about 16 thou of an inch over a 6" long screw

Myford use a 21 tooth gear for metric threads which will give 1.0079 for 1mm and an accumulated error of 48 thou over 6"

Scrap what I said about the Myford approximation. They use a different system, I'm not ontop of how that one works.

Helo Chas
Called Mick Moyle must have sold it so still looking

Thanks Les