How Do I Plug A Hole

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75Plus:
Paul,

After I turned the diameter I stuck a ball end mill in the tail stock and bumped the center for the depression. I then parted it off leaving it about .025" long. Next I bored a short piece of 1/2" aluminum round stock to 7mm and split the length with a hack saw. This gave me a sacrificial holder. I inserted the part into the holder, placed both in a R-8 collet adapter that I had made previously.

Using a 1/2" collet I closed it tightly and placed the unit in the 3 jaw.

Then, using this depth gauge that I had adapted, I proceeded to reduce the length to the .056" needed.

I removed the adapter from the 3 jaw and moved to the buffer for final polishing.

Job Done!!!

More information on the R-8 adapter and the depth gauge re-purposing can be found here.

http://madmodder.net/index.php?topic=4474.msg49168#msg49168

http://madmodder.net/index.php?topic=5934.msg62600#msg62600

Joe

pjf134:
Joe,
I am a little confused on the actual shape of the finished part, and how does that ball cutter come into play. Maybe a pic of the finished part would help me get the idea. I think the bolt thru the parts got me wondering why the hole in the part, I thought there was no hole.
Paul

75Plus:
Paul,

The finished part is 7mm in diameter by .056" thick with a mirror finish on one side. It is made to plug a hole that was bored with a 7mm end mill thus the center of the hole is only .052" deep. That is the reason I bumped the one end with a ball end mill.

Sorry I don't have one of the parts to show but I am jammed up on other work at the present. I will be making more but not sure when. I will post pictures when I have to photograph.

Joe

pjf134:
Joe,
Thanks, I think I get it now, the ball turner got me confused.
Paul

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