Just looking for "rules of thumb" for determining depths when drilling/tapping/reaming blind holes.
Lets say I want to cut two holes in mild steel.
Hole One: Tap Depth 1.5" +.060/-.000
- 1/2-13 NC Tap, 3 spiral flute, semi-bottoming (I think, what does that mean by the way?)
- .421 Drill
How deep should I take the tap drill? How deep should I take the tap?
Hole Two: Reamer Depth 0.375"
- 5/16 over (+.001) chucking reamer (whats a "chucking" reamer?)
- .302 drill
How deep should I take the drill? How deep should I take the reamer?
Thanks very much for your thoughts. Also be grateful to hear any other thoughts about the tappping scenario. Someone suggested, for example, I add a compulsory stop to the program and blow out the holes before tapping them. Is that necessary? etc. etc.