Hello,
I need to drill 4 2" holes in a 3x2x1/8 steel rectangular tube. I bought a 2" bi-metal hole saw and managed to drill 1 hole and half of the second one until the tips of the teeth were all flat. I went back to the hardware store and I bought a "better" 2" bi-metal hole saw and I was able to finish the second hole I have started and half of the
3rd one before the teeth were flat again.I don't know what to do... Is there any better hole saw/technique to do this properly? I need to drill one more hole now and finish the 3rd one that I started.
Are bi-metal hole saw not the proper bit for this job? In the instructions says that it should be ok to handle 1/8 thickness at 160 RPM.
Any ideas?
Thanks in advance. Guillermo