I'm pretty new to machining. This is a spindle thread protector I made for my 1945 Logan/Wards lathe when I'm using collets. I started with 2" CRS. Now it's a 1 1/2 - 8 internal thread with spanner hole and knurled edge for easy on and off. I have two or three small door stops from learning to make internal threads, but learned a LOT doing this. To get the threads just right, I made a 1 1/2 - 8 external thread "spud" that fit my chucks perfectly. Then I could test fit the internal threads on the spindle protector for correct fit without taking them out of the chuck. Credit goes to Tubalcain and his YouTube videos, specifically #23. I would give anything to have had him as my shop teacher in high school or tech school! These are my first photo uploads, so I apologize in advance if I did it wrong.
GarageGuy