- #1
hihiip201
- 170
- 0
In the shop I was taught that , for a larger drill bit, use slower speed, vice versa
I would like to know for what reason this is? I understand by using slower speed for bigger drill bit and vice versa, we can maintain the same/similar velocity at the outer edge of the drill bit, (omega * r = v)
but for what reason do we want a certain drill cutting edge velocity to be in a certain range?
I first thought it was the material strength, harder the material, faster the speed , but it didn't make sense to me since the machine would just output whatever torque require to keep the drill bit at constant velocity while drilling, so the material hardness shouldn't have anything to do with the speed.
so is it for safety? chip removal rate? if not, what?
thanks
I would like to know for what reason this is? I understand by using slower speed for bigger drill bit and vice versa, we can maintain the same/similar velocity at the outer edge of the drill bit, (omega * r = v)
but for what reason do we want a certain drill cutting edge velocity to be in a certain range?
I first thought it was the material strength, harder the material, faster the speed , but it didn't make sense to me since the machine would just output whatever torque require to keep the drill bit at constant velocity while drilling, so the material hardness shouldn't have anything to do with the speed.
so is it for safety? chip removal rate? if not, what?
thanks