Newbie- 40 IPM is the max?

[Geof]

Originally Posted by project5k absolutely agree. the one thing that i will say is that if you have enough lash in your movement system that you can overshoot by a couple tenths of an inch, perhaps spindle speed shouldnt be the first concern.

Probably the meaning in escott76's 'tenths' is tenth of a thousand, in other words 0.0001".

In machinist 'lingo' tenths are .0001" and 1/10 of an inch is a hundred thou.

[HimyKabibble]

Originally Posted by project5k escott, your right, but in mycase, where i spend 90% of my time running 1/8" and smaller endmills, i dont think im in any danger of rigidity issues. I am aware that my increasing the rpm in this manner will reduce the available torque at the EM, but do you really think its gonna be an issue on a 1/32" endmill, or even a 1/8"? I dont. and on thoes rare occasions when i do use an EM larger than that, i still have low range in the gearbox to go to when i need more torque. Yes i know that it'll be less, but still, doubtfull i'll go there. its just like a transformer. you can up the voltage, but have less available amperage, and vice versa.

"i dont think im in any danger of rigidity issues." - Don't be so sure.... One of the things that can kill tiny endmills is vibration, which is related to rigidity. Small vibrations that can be absorbed by a large endmill can quickly fatigue and break a small one. At 1/32", even a few tenths can do it. Spindle runout is another critical factor, for the same reason.

Regards,
Ray L.