Hi there! I'm confused with this one... I've got these plywood squares that I had to drill a bunch of holes in. Despite using a low speed on my drill and adding masking tape (below) there's still pretty nasty tear out on nearly all holes. (EDIT: These are not through holes, this is for crochet square blocking boards. Metal rods which need to stay in place are put into the holes.)
And this is it after removing the masking tape.
What should I do? Thanks in advance!
I would clamp a scrap piece underneath your work piece and then drill. Should take care of the tear out better than tape.
The other way to go would be to use a lipped brad point bit or a forstner bit depending on the size of your holes. Those bits have a cutting edge around the circumference of the hole to prevent chatter when starting to drill and to produce a cleaner pass. A good set of brad points will cost you $100 or so but are a great investment imo.
I hadn't considered the quality of the bits, but that's a fair point. These are from sets that are probably $25 max, I'll be sure to grab some higher quality ones, I didn't realise that would have such an impact on something like drilling holes. Thank you.
No problem! I think you could probably still improve performance with a scrap piece and good clamp pressure before you’d have to spend any money. Good luck!