I'm making a new aluminum adapter plate (for a unique engine/gearbox combination).
The dowels in the back of block are ground to .500" diameter.
I can drill the adapter holes to .505" (5 thou clearance) -
- in practical terms is that accurate enough?
To achieve that I first drill a 31/64" pilot hole then slowly open it up with a well lubed 1/2" drill.
If tighter is recommended what size reamer should I buy?
Do reamers produce a slightly oversize hole like drills do?
What reamer size should I buy - .5005" ?
Thx.