Drilling the output shaft.

[Joseph]

Since it's M8 and that needs a big hole drilled, it can just be drilled to 5, tapped to M6 and the rotor held in with a bit of 8 OD 6 ID tube to cover the diameter difference

Edited May 8, 2022 by Joseph

[Blue]

Normally you'd use a 6.8mm to tap an 8mm hole, are you using a 7.5mm due to the hardness of the steel?

[Jaydee]

13 minutes ago, Blue said:

Normally you'd use a 6.8mm to tap an 8mm hole, are you using a 7.5mm due to the hardness of the steel?

Pretty much answered your own question. Yeah, last thing I needed was breaking a tap in the hole. Even at 7.5mm, there's a fair bit of pressure tapping the hole. I.m.o. tapping a 6.8mm hole would've broke the tap. 

I have Zeus handbook for that I normally use as my go to for drilling specs but winged it in this case.

[GSX1100dreamn]

I ran into the same problem 2 years ago but did a 'temporary' fix until I get some different drill bits.

'temporary'... 2 years ago...

 

oh well.

Edited May 8, 2022 by GSX1100dreamn
Added info