Swingup external threading tool

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DaveH:
Roy,

Thanks I'll have a look :D

:beer:

DaveH

DaveH:
Roy,

OK I found it - expanding mandrel, the way to go :D :D

Thanks

:beer:

DaveH

doubletop:

--- Quote from: dsquire on June 07, 2011, 03:46:30 PM ---I am going to bump this thread up as there seems to be some new interest in this tool.

Don

--- End quote ---

Mike Cox has an article on his original design in issue 178 of MEW and has quoted this thread which is probably generating the interest.

Pete

David Kirtley:
Well, I have been reading this thread for a while and wanted to try my own version. It is a work in progress but I thought I would look for some feedback from people that know more. I am just starting out and this was my first attempt. I figure it was better to actually make something instead of just swarf.

I was under a bit of a constraint fitting it on a little mini-lathe QCTP (A2Z CNC). Instead of a key, I just plowed a groove for it to fit in to keep it from moving left or right.

Here is with the tool holder in place It gives me about 0.25 room to adjust up to meet center height. The bottom of the tool holder is a bit thin but all it will be holding is the locking screws. The force will be on the main holder base. I left that as thick as I could.:

I milled a bit away on the swing arm to keep it from interfering when it swings:

I might put a shoulder bolt for it to swing on but for right now, I just have a cap screw. I doubt that my poor little lathe could develop enough power to snap a 1/4-20 screw. I have not decided yet where I am going to trim off on the front and back. Right now it is way to long front and back so I had enough wiggle room to shape and finish.

Next up will be drilling for the lock screws for the tool holder and the adjuster.

andyf:
Nice one, David :thumbup: .

Might the width of the support to the left of the swinging part get in the way if you want to thread close up to the chuck jaws? I think that's why Bogstandard, when he reworked the original design, used a key underneath. Of course, if you only want to do RH threads, you don't need any support on that side (or a key) at all.

Screwcutting a shoulder bolt, with a plain shank to act as the pivot, should be no problem now!

Andy

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