- Joined
- Feb 13, 2012
- Messages
- 60
About what size would it become necessary or at least advisable to predrill with a smaller bit? I have a little project that needs a 5/16" hole shot through about .750" aluminum plate. I would like to just pop one of my HSS screw machine bits in the collet and do the entire hole with it and forgo the predrill.
In most cases, I predrill any hole in any material from 3/8 and larger. Mainly because it is easier with less heat and stress on drill bit.
In your case, I would use a split-point drill bit.
Just be aware that hole will be slightly larger without predrilling.