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M35A3 Bobbing problems

J

JohnnyBM931A2

Member
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Location
Crystal Lake, Illinois
frank8003 said:
It is 4X CS divided by diameter and has to do with the metallurgy of what you are drilling into.
Magnetic base drill, proper speed, correct drill included angle and back rake has to do with it.
You would all be surprised as what is the best lubricant to use on the twist drill.
Did you ever drill holes in railroad tracks?
Click to expand...
That post was from 3 years ago :)
 
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