Rotary Quill Movement

[krisfarm]

Hi Dean,
That was my thought. As the quill is round I thought you could get two pieces of say 1/2" thick steel plate cut into a square about 2" larger than your quills diameter, tack weld them together, machine a quill sized hole in them then split them in halves to make them clampable around the quill. Before you split them drill and tap each side with say 6mm threads as clamping bolts. After splitting them machine a key way sized slot in the exact centre of one half set.Then make up the dog legged key that fits into this half clamp and also locates in the quills key way, this part would have to extend up outside of the quills casting and have two or three pilot drill holes and also extend down the quill to enable the clamps to be spaced as wide apart as possible. Sorry if this sounds complicated.
Bob

[Oldneweng]

Hi Dean,
That was my thought. As the quill is round I thought you could get two pieces of say 1/2" thick steel plate cut into a square about 2" larger than your quills diameter, tack weld them together, machine a quill sized hole in them then split them in halves to make them clampable around the quill. Before you split them drill and tap each side with say 6mm threads as clamping bolts. After splitting them machine a key way sized slot in the exact centre of one half set.Then make up the dog legged key that fits into this half clamp and also locates in the quills key way, this part would have to extend up outside of the quills casting and have two or three pilot drill holes and also extend down the quill to enable the clamps to be spaced as wide apart as possible. Sorry if this sounds complicated.
Bob

Ok. I get what you mean. This means I would have to be able to machine a hole. Hmm. I would need a boring head for preference. Oh, I have just received one from CTC!

You missed one point tho. I could use the existing threaded hole for the grub screw that does the anti rotation job at the moment as a steady close to the drilling location.

I will have to investigate the extent of the keyway and see how long I can make the key without restricting Z movement. It is starting to look promising.

Dean

[krisfarm]

Hi Dean,
Yes you could use the existing grub screw hole it would assist a lot. If you had a piece of thread the same as the grub screws you could drill a small hole say around 1/8" diameter in your lathe through it and use this hole to align with one of the pilot holes in the dog leg bar. A great project for your new boring head. I have a CTC one as well, just check out the graduation marks on it as mine is supposed to be imperial, but the graduations are metric.
Bob

[Oldneweng]

Hi Dean,
Yes you could use the existing grub screw hole it would assist a lot. If you had a piece of thread the same as the grub screws you could drill a small hole say around 1/8" diameter in your lathe through it and use this hole to align with one of the pilot holes in the dog leg bar. A great project for your new boring head. I have a CTC one as well, just check out the graduation marks on it as mine is supposed to be imperial, but the graduations are metric.
Bob

Thanks for the tip. I will check it.

Dean