I will end my involvement with a thought about what is it that you are trying to put neat clean hole in. I cannot remember how many holes we drilled in concrete, watching to make sure that the bit did not wander and that the hole was the right depth before we tapped an anchor to just the right depth to hold big nasty telecommunication equipment. Rows and rows of it. I guess it just matters in the end as to what it is that you are trying to accomplish and how good/accurate that you need to be. I bet that we are all like minded when it comes such matters.
Well I hope you found a way by now, but making a drill guide and having everything secured together works pretty well.
For a small number of holes, a soft material like wood will work to keep the drill from glancing around. Other than that, having the right drill speed, and feed rate, cutting fluid or wax will help greatly. That’s assuming the drill geometry is correct for the application…
For a small number of holes, a soft material like wood will work to keep the drill from glancing around. Other than that, having the right drill speed, and feed rate, cutting fluid or wax will help greatly. That’s assuming the drill geometry is correct for the application…