GraemeVW
Member
- Messages
- 1,661
- Location
- Chesterfield
One of the few plaques that survive on this lathe is this nice little npl one that sits in the center of the cabinet.
I didn't know what it was, but some searching showed this up on everyone's favourite lathe resource page.
This is from a different lathe, but seems the same applied to this lathe
"The leadscrew (1-inch diameter by 4 t.p.i. or 6 mm pitch Acme-form) was known to hold true to within 0.0005" over twelve inches - and, if necessary, a lathe could be provided with a N.P.L. certificate guaranteeing the accuracy of the screw to within 0.004" over its full length of thirty inches"
Not sure what ship(1) refers to though, must be code for the specific test.
I didn't know what it was, but some searching showed this up on everyone's favourite lathe resource page.
This is from a different lathe, but seems the same applied to this lathe
"The leadscrew (1-inch diameter by 4 t.p.i. or 6 mm pitch Acme-form) was known to hold true to within 0.0005" over twelve inches - and, if necessary, a lathe could be provided with a N.P.L. certificate guaranteeing the accuracy of the screw to within 0.004" over its full length of thirty inches"
Not sure what ship(1) refers to though, must be code for the specific test.