- Joined
- Sep 22, 2010
- Messages
- 7,223
Guys,
After a hole has been center punched in the material, how do you accurately locate the "dimple" with the lead drill?
I read the following methods:
Re-punch your prick punch mark. Line up close, start drilling with a lead drill. Use an 1/8 " or so. The drill will follow the path of least resistance and start in the punch mark. The finish drill will also follow the path of least resistance (1/8" hole).
Or use a wiggler and magnafier, followed by center drill, drill, boring bar, and reamer works.
If great accuracy is required, a bore scope can pick up layout lines within .001. Or use toolmakers buttons. Buttons can be made from a scrap of .500 drill rod, faced square and drilled .281 or so. Drill and tap @ hole locations. Clamp buttons and adjust with height gage, venier caliper, or standards. Indicate your buttons in. Drill and bore as above.
Are these suggestions correct- or is there a better method you know of?
Thanks,
Nelson
After a hole has been center punched in the material, how do you accurately locate the "dimple" with the lead drill?
I read the following methods:
Re-punch your prick punch mark. Line up close, start drilling with a lead drill. Use an 1/8 " or so. The drill will follow the path of least resistance and start in the punch mark. The finish drill will also follow the path of least resistance (1/8" hole).
Or use a wiggler and magnafier, followed by center drill, drill, boring bar, and reamer works.
If great accuracy is required, a bore scope can pick up layout lines within .001. Or use toolmakers buttons. Buttons can be made from a scrap of .500 drill rod, faced square and drilled .281 or so. Drill and tap @ hole locations. Clamp buttons and adjust with height gage, venier caliper, or standards. Indicate your buttons in. Drill and bore as above.
Are these suggestions correct- or is there a better method you know of?
Thanks,
Nelson