Easy to use lathe spindle backstop.
This is a back stop I made for my Colchester Student 1800 lathe. The stop is machined with a piece of square stock clamped it one end with a counter sunk screw and a through thread at the other end. (like a key in a key way slot) The main body is then turned to the correct dimension to give a slide fit into the lathes head stock spindle. The square stock has the same outer diameter profile. A suitable sized hole is drilled and reamed for the stop bar (in my case 12mm) A hole is also drilled and tapped the opposite side to the square stock for a brass slug and a grub screw to clamp the stop bar at the desired position (the brass slug stops the grub screw from chewing up the stop bar so it is easy to slide in the main body. To operate the main body is slid into the spindle and the tapped hole in the opposite end to the counter sunk screw is tightened which forces the now turned square stock to raise and clamp the main body within the spindle. The stop bar can then be set using the clamping stop bar grub screw. The two thick washers are clamped using the same brass and grub screw method and are there to stop the bar from whipping at high speeds.
Fitted and locked in lathe spindle
Photo showing stop bar lock screw opposite square clamp
Thank you for viewing.
Hope this all makes sense if not please ask questions
The Home Engineer