12-08-2017, 08:58 PM
A cylindrical square has been on the list for some time. Decided one would be great for reference when checking the fixed jaw on the shaper vice.
Had a 6 inch piece of 3 1/2 dia heat treated 4140. Held it in the 3 jaw and recessed the ends and centre drilled. Needed a way to drive it so drilled and threaded the end for a 1/2 inch stud to mate into the drive plate of the lathe, a set screw will plug the hole now.
Turned between centres, using a honed brazed carbide cutter for the final passes. Can't measure any taper with a regular mic, only have 1/10th pics up to 3 inch. Faced the narrow outer edge left after recessing the middle.
The .0005 test indicator shows less than a 1/2 division variance as I go around the cylinder. Good enough for the girls I go out with.
Had a 6 inch piece of 3 1/2 dia heat treated 4140. Held it in the 3 jaw and recessed the ends and centre drilled. Needed a way to drive it so drilled and threaded the end for a 1/2 inch stud to mate into the drive plate of the lathe, a set screw will plug the hole now.
Turned between centres, using a honed brazed carbide cutter for the final passes. Can't measure any taper with a regular mic, only have 1/10th pics up to 3 inch. Faced the narrow outer edge left after recessing the middle.
The .0005 test indicator shows less than a 1/2 division variance as I go around the cylinder. Good enough for the girls I go out with.
Free advice is worth exactly what you payed for it.
Greg
Greg