onewaywood
Member
Could someone tell me what number centering bit I should buy for pre-drillng.
Could someone tell me what number centering bit I should buy for pre-drillng.
Could someone tell me what number centering bit I should buy for pre-drillng.
There is no number to use. All center drills drill a 60 degree hole and pre-drill just fine. I use a number 4 I got from JohnnyCNC. Again, he is a great guy to work with and I will always recommend him and his products.
They're so cheap I recommend you get the assortment pack, it's either 4 or 5 drills for just a few bucks. The tip of the drill bit should be equal to or smaller than the center bit.