How do I set and turn very small internal taper (ER11)

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PekkaNF:
Thank you Lew_Merrick_PE. I prettyy much got it! I have some h7 reamers, just need some more size stock to fit snugly on the holes.

I made a practice run, I have a whole less margin on harder tempering steel banks I made a week ago.

I used some mysterymetal from the hardware store. Brother bought some 16 mm "bright rolled stock" or something and I tried taper and thread.

It was a partial success, now I have to consider in which order I'm going to "the real thing".

After a lot of fiddling with DTI I think I got angle pretty close. Two collet option was harder to work with. I eventually resorted to using only one ER25 collet.

Then I used NC centerdrill, followed by 7,5 mm drill 18 mm deep and cut taper with HSS-boring bar.

M14*0,75mm thread took a lot of tinkering, but it finally fit. Seems to be somewhat undersize.

Finnaly TIR was about 0,02mm, not too great, but not blistering defeat either.

Now I should come out proper work order to turn spindle bearing locations and collet taper/thread. My plan is to do all OD dimesions on one go and then use steady to fix collet end. Then I would drill/taper/thread collet end.

Pekka

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