I have got my hands on a new toy. A dividing head.
But it lacks a tool for tightening objects in to the chuck. So we need to make one.
I took a 22mm diameter shaft and measured that square hole has a 10mm side. So I need to take 6mm off from each four side of the shaft. Chuck has a wheel of 36 teeth and one can lock those teeth in position, one at the time. A quick calculation gives that when the first side is milled down 6mm, 18th teeth must be locked in and then milling can continue. After that 9th teeth locked and milled. And the last 18th teeth and milled. (Of course this can be done by 9 teeth at a time.)
Her we are in the middle of the process.
When all sides was milled, I bored a 13mm hole to the shaft. At first I used a center drill bit and a lubricant and then I gradually moved from 6mm to the big one.
All I have to do is to cut those 22mm and 13mm shafts in convenient length and make some adjustments that 13mm shaft don’t slide through the hole in 22mm shaft. And of course to do some grinding. Shafts are just some ordinary steel (st52 or something like that) so I am not expecting them to last too long, but time will tell that. On the other hand, I don’t believe that this dividing head (and its new tool) is going to get too much attention in its current location. Conveniently other chucks around the shop uses a different size of a square tool.
Here is the Machine behind all of this..
And no, I don’t own it, I just can borrow it and facilities around it.
Remember to use at least safety goggles (and Colin’s safety tie 😉 ) when using metal working machines!