Author Topic: Rounded Bottoms (Read 643 times)

Powder keg · « **on:** March 22, 2006, 01:52:52 AM »

I had an idea on making the bottom of my powder chambers radiused. Here's what I came up with. I took a regular twist drill and freehand ground a radius on the business end of it. I didn't even use a gauge, just my trained eye. Now when I drill a hole I save the last 1/2" or so for this little guy. The second picture shows the clearence that I had to grind to get it to cut good.

Double D · « **Reply #1 on:** March 22, 2006, 04:50:17 AM »

I was always partial to round bottoms, er ah, a in cannons that is. :lol:

Cat Whisperer · « **Reply #2 on:** March 22, 2006, 07:39:28 AM »

I did that to one of my spade drill bits - ahhhh - ok - it was after I ran it a little too fast and burned the corners.

GGaskill · « **Reply #3 on:** March 22, 2006, 08:55:09 AM »

Looks like a ball nose end mill now, which is how I do hemispherical chambers. The problem comes when trying to do the bottom of an unchambered piece as there isn't room for the end mill holder. Then a round corner silver and deming drill is useful with its undersize shank.

accuratemike · « **Reply #4 on:** March 22, 2006, 01:29:55 PM »

Wes, Thanks for the pointer. I was wondering. MIKE