Before dinner progress.

This is the drawing I am using, but for some reason not following very well.

This is the setup I was using for support when drilling the center hole, worked well. I like my starrett adjustable parallel.

Regarding diamond pattern or straight, I agree completely that straight is for knobs that need turning since they won't be that good for pulling On a serious note I would consider the pattern for a rotating knob to be cosmetical as you can choose either one or the other. However maybe you have some knob that you don't taunt to get pulled then straight would be a better choice. I chose diamond knurling for two reasons, one is that I don't have any straight wheels here as I have left them at my fathers place, second I don't want to drop this tool with oily hands.

Anywho I always refer to this document when designing a part to check how much torque I can apply,

**LINK**

Here is some more great information about knurling and computing diameters and such.

**LINK**

Ian, I would have loved to do this project long ago, but I have gotten by on newly manufactured cheap tap wrenches and at some point I got fed up with the quality and decided to look for vintage tooling, when that failed I decided to make my own. I have also designed a bigger version with movable jaws that I will start making fairly soon.

Ian I remember a long time ago when I also tried to mill with a Jacobs chuck, but in a drill press

I was a kid back then and it was my fathers drill press, thank god he is a forgiving man.

I would have loved to be an apprentice and learn how to file. Since I started this hobby on my own I did not start with filing since it seemed boring, however I constantly curse my crappy filing skills, which gets better and better but I should really force myself to file for a month or so.

In fact I really love old school machining and do not really like carbide tooling, I see the benefit from I time perspective but the slow cutting speeds with sharp tools and cutting oil and the silent cutting action is like music to my ears and candy to my eyes. Once I get more space I will immediately get a shaper and a horizontal mill, beautiful machines…

I decided to knurl also the other arm of the wrench, this is the tool in action.

The finished result, I am really happy with the smooth action of the adjustment screw.

Steve, I had thought about that issue actually and the plan was to make the 4mm push-pin out of silver steel and harden it, but I doubted that I could harden the tip and keep the pin straight enough. For this reason I decided not to harden it, but still made it out of silver steel since thats a bit harder than cold-rolled, but after reading your comment I went ahead and hardened and annealed the tip (thank you for this), without problematic distortion I might add. Again my filing skills could have been better and I struggled a bit filing the bottom vee grove to get it perpendicular and flat, but eventually it was passable