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Hole saws for 4130!

fishead

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Okay,
I think of myself as a fairly intelligent person.Have a four year degree,fly widebody aircraft all over the world as a captain for a major cargo airline,but I just cannot figure out how to keep from tearing up hole saws when cutting tube.I have gone through about 6 saws.Every time I cut a tube I rip the teeth right off.I go very slow maybe 400 to 500 RPM and use lots of lube.Is it the tubing being 4130 and I am using crappy saws? Are there any super tough saws out there? Help me Help me Please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
 

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