Yea, when you say to yourself "Why didn't I think of that" it usually means it's a good, simple and useful idea
Speed will also kill the blades... slow is good... fast is bad. Does anyone know what actually speeds, or rpms per in hole saws should be running at? Sam.
get a copy of the machinist handbook if you don't already have it.. it's in there... it can be figured out as a calcualtion, based on feet per second of the blade.. larger the diameter, the slower you go...
The speed calculations would be great, but the general problem is that most reasonably priced drill presses don't go slow enough because they are made for wood. I bought mine from Harbor Freight and looked at them all before I did. What I got was one that goes as slow as 50 RPM and works well for larger holes like this project required. If your slow speed is in the 200-300 range, it will be too fast. Mine also has a taper shank that I can remove the chuck from and use larger diameter taper shank drill bits. The Drill press that I got was a floor model that was missing one knob, and the chuck key, and they knocked $100. off the price because it was the last one they had.
fukin a right, thats badass. definitley have more than enough holesaws with teeth missing too. thanks for the tip!
All of my hole saws use a 1/4" pilot drill. I drill the pilot hole with a regular drill. I use a short length of 1/4 drill rod in the arbor. When you use a drill bit in the arbor it tends to wallow out the pilot hole and that can result in a slightly larger principal hole.
The Jalopy Journal
