As you see the titanium gets very hot and the oil vaporises. So always wear your safety equipment :
To continue with the head, I widened it to 20 millimetres, so plenty of space for the driver I will design later:
Time to add a chamfer to the hole through the head:
Here you see the hole in the head:
Everything was ready for threading the head:
Since there need to be square threads I had to do some preparation work. I could use the tool I already made here , but I needed to grind a new cutting blade:
In order to not scrape against the material which is behind the the blade I angled the blade slightly in the tool holder:
Next I had to adjust the height of the new cutting tool in the toolholder. A good method is to align it with the edged āIdonātknowthenameā thing:
It was working:
Unfortunately, it didnāt fit right from the start:
To make sure it wasnāt a previous mess-up I measured the depth of the thread. A good way to do that is to use wire. It even works with not-square-threads, although you will have to do some calculating. However, the threads were deep enough:
And this is where I messed up again. In the end the thread was way to wobbly and didnāt really fit anyway. This time there was unfortunately no way to save it. So I just took 10 millimetres away and started all over again. First, adding two more indents to the outside of the head and then the rest all over again. The second time, it didnāt quite fit from the start either, but this time I was a little bit more careful. If two parts have to fit in each other but donāt, one way to figure out the problem is to paint one part:
And then afterwards you see where the paint was scraped off (Unfortunately no picture here, since I didnāt get it photographed properly).
Anyway, this time I managed to cut the thread right - not too tight, so they donāt get blocked by every bit of dirt and of course not too loose either:
I also added chamfers to the threads on the inside:
Now everything fits nicely and the thread is very smooth:
Thanks for reading!