Well I walked into that one eyes wide shut!
I just had an idea while reading your thread. Next time you need to put a hex key into a hole, what if you milled a circle hole pattern of 6 small holes of an appropriate size positioned to just clear the points on the hex key? The milling passes outward from the center toward each point would then also clear out the center of that pattern to fit the hex key down into the pattern. I believe it would prevent the hex key from slipping, and not require any special tooling to make it work. Left image is the pattern of holes milled away. Right image is what you have left, with the hex key in it.
This example I did in CAD is for a 3/8 hex key hole, and the holes to mill away would require a 7/32" or perhaps a 5mm end mill. I don't think the holes could be done with a drill, unfortunately, because of the major amount of overlap.
Never try to tell me it can't be done
When I have to paint I use http://kbs.justoldtrucks.com/
Canobi (Sep 3, 2017)
Be that as it may, I came across a really simple design the other day that even my novice skills can turn out, so I'm working on one right now
There were no drawings of it I could find so made my own as a guide and left the numbers off as it can be scaled to suit. Credit goes to randyc (practical machinist forum) for the concept design:
Here's where I'm at with it so far. The shank is bright mild that is press fit into the main body, which is made of 306 stainless:
Last edited by Canobi; Sep 3, 2017 at 10:20 AM.
It's not the destination but the journey you take to get there that matters.
When I saw Rotary Broach mentioned here I looked them up, as I'd not heard of them before. Very cool! But the retail prices for the holder, the part I see you are making, are crazy expensive, especially for a tool that won't see frequent use as a hobbyist. So I am very interested in your project! I see the actual broach bits for these holders aren't too unreasonable. So if I made a holder, I could see owning a few bits.
I was wondering how they accomplished the wobble. Your drawing explains that. Did you turn the 1/4" ball, or is that a bearing ball you bought?
There are currently 1 users browsing this thread. (0 members and 1 guests)