I offset it the .064" first and did the 1/4" hole then the thread & counterbore close to the .410" depth, then trued it up and finished the big cavity with a homemade grooving tool.
I just happen to be in the right place at the right time to see a colleague moving his Aciera F1 Milling Machine into storage and ask if I would like it as he didn't use it much and need the space for house renovations.
So know I have a very nice Mill to play with over the xmas break. It had a...
Strictly IC Magazine
KIRK MINIATURE DYNAMOMETER,
by Bud Kirk & Bob Washburn.
A Hydraulic (Mechanical Water Brake) Dynamometer.
Issues # 62, 63, 64, 65, 66, 67, 69 & 70
Paul
FYI
The End of an Era
Sadly, the Australian Model Engineering magazine has come to an end. The growth of the digital world and in particular social media has finally taken its toll, and like many other magazines AME has now fallen victim. Issue 214 (Jan-Feb 2021) which is being mailed next...
https://www.homemodelenginemachinist.com/threads/compact-micrometer-boring-head.31250/
Construction articles by G.A. Harding on making A compact micrometer boring head appeared in model engineer in Jun/Jul 1982.
issue 3684 & 3682