email: tony@lathes.co.uk
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Frank Parr's Home-built Lathe
Screwcutting
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Screwcutting was by a train of changewheels, the drive passing through a tumble-reverse mechanism to the twin leadscrews. Gears were held on a forked bracket clamped in place by a lever that allowed quick and easy repositioning when the ratio needed changing. The reason for employing two leadscrews is uncertain, though as the two were geared together and so ran in opposite directions, it was possible (instead of having to stop the lathe and operate the tumble-reverse lever) to keep everything running and reverse the direction of the saddle by simply engaging the appropriate clap-nut lever on the apron.


Geared together, the twin leadscrews revolved in opposite directions


Parr Lathe Home Page   Headstock   Carriage   Tailstock
 
Accessories   Drive System   Screwcutting   Patterns

Frank Parr's Home-built Lathe
Screwcutting

email: tony@lathes.co.uk
Home   Machine Tool Archive   Machine-tools Sale & Wanted
Machine Tool Manuals   Catalogues   Belts   Books  Accessories