This is not much of a project, but I decided to post it anyway. I had fun doing it and it will make things easier for me later.
I have a Sherline Mill. The headstock (at least it is the same as the Sherline lathe headstock) has a number one morse taper. To use a drill chuck with the mill, you thread a MT1 adapter to the back of the drill chuck and you have a hex head cap screw to act as a draw bolt. I also have a set of three milling collets that fit into the “headstock” MT1, except the threads are larger in the back of the collets.

So, the drill chuck ends up with a 7/16” hex head and the milling collets end up with a 1/2” hex head. Keep in mind that as small as this machine tool is, the size of the hex heads are complete overkill. When I use them I very gently tighten them, you don't need any more torque than that on the little MT1 taper. So, being the lazy person that I am, I decided to machine the milling collet draw bar hex head down to 7/16” so that I would only need one wrench for both. (That and the fact that I had the rotary table already set up, so this was something else that I could do that is fun.)
OK, try not to laugh, I know this looks kind of ridiculous but it is the best that I could think of to mount the draw bar (bolt) so that I could machine the hex. I tightened the bolt into a self centering 2.5” chuck. Then, because the bolt had to go down the center of the rotary, I used some milling hold downs to hold the chuck on the RT. Here is a photo of the setup as I centered the part on the RT axis.

It's kind of funny, I usually use a milling collet to hold the DTI, but the draw bolt was in the chuck, so I had to think of the next best way. Then I remembered the WW collet set that I got (another of those “I just had to buy” items) and finally used it for the first time since I got it. (Mental note, need to think of more projects where I can put this set to good use.) It worked perfectly for the 5 minutes that I needed it!

Anyway, I machined .025” off each facet of the hex head, then decided to resurface the top. When I tried it with a wrench it seemed a little loose until I tried an actual 7/16” hex head, the one I machined was tighter. Too much measuring down to the last thousandth of an inch I guess.
So, here is the result:


I had some fun, and now I only need one wrench (spanner) at the milling machine.
Russ
P.S. Does this take the prize for the shortest and most ridiculous project?