01-03-2022, 10:03 PM
(01-03-2022, 08:16 PM)KB2WVO Wrote: now to find out. the 4 jaw chuck i have needs back plate. thats measureed from diameter ? iam guessing
Dr Stan. probley better for me anyways. to learn with.. iam not building parts for nasa lol .. i do have to make a wedge for it tho. it wasnt with it. then find a place to grab one of the wedge bit holders. no idea what you call it... but the stock that fits the horseshoe and holds cuttin bit. there are some bits ill have to post pic to see if they can be reground or reshaped or whatever is done with them
iam also guessing here. but this is a add on for maybe Valves ?
Yes the back plate should match the diameter of the chuck you are mounting to it. It also needs to have the correct thread size and pitch to fit the threads on your spindle nose. New back plates often come oversized a bit so you can turn them down to match the chuck size.
What you have is known as a "lantern" style tool post. You would look for "lantern style" tool holders to slip into the slot on the tool post that your cutting bit will be clamped into. The 'wedge' you mention is called the rocker. It allows tilting the tool holder up and down as needed to get your cutting bit to the right height. The wedge Dr. Stan was referring to is for a different type of tool post that is often used to replace the older lantern style tool post.
And yes the tool post grinder you have there is for doing general outside grinding of shafts or other cylindrical work pieces. You remove the normal tool post and mount the grinder in it's place. It's for getting precision diameters and fine finishes. And yes it could be used for grinding valve surfaces as well.
Find yourself a copy of one of the numerous books titled "How to run a lathe" and dive in.
Willie