Hello David.
Some time ago I bought from one of the two: Chronos or RGDTools, a set of three flycutters which has a set of four detachable shanks. Two of them were MT2 and MT3. The other two are cylindrical.
The MT2 shank had a 3/8″ thread and the drawbar in my milling is 10mm.
I had the flycutter in my hands and my only solution was to use a 10mm HSS tap and redo the thread in the MT2 shank.
Couldn’t analyze the resulting threads in the detail. But given the length of the section of the drawbar entering the shank I thought the resulting threads would be enough to support the efort.
I had to do the same operation in other tools I bought with threads 3/8″ and I find it is a “good enough” solution.
Notes:
Depending on the hardness of the MT, You may have to use a very good set of taps. After some trying I used a set made by a Spanish company named IZAR. I was most satisfied with their taps. After that I mostly buy cutting tools made by them and distributed here in Portugal.
Yes, i found oily gunk within. So if You go this way You should take care.
My only connection with IZAR is as a satisfied customer.
Best regards
Dias Costa
Edited By Dias Costa on 20/01/2011 14:34:14
Edited By Dias Costa on 20/01/2011 14:35:29