Any online or linux application to help me calculate feed rate and spindle speed

Any online or linux application to help me calculate feed rate and spindle speed for cutting?

Yes, plenty of websites that do this, a Google search will be your best bet.

“Feeds and Speeds Calculator”

well, then let me reformulate the question: which one is the community choice for feed and speed caclulation?

Simple: http://www.custompartnet.com/calculator/milling-speed-and-feed
Complicated: http://zero-divide.net/?page=fswizard
Good: http://www.daycounter.com/Calculators/GCode/Feed-Rate-Calculator.phtml

I have used them all at one point in time or another. I think 3rd one is my favorite.

Maybe I should add that this is our first CNC and we just got a Kress 1050i and some routing bits, plus a sheet of 10mm acrylic I d like to start cutting, getting ready for our very first real cut…

Yes, for acrylic you will want to move fast.

for example using http://www.cutter-shop.com/information/speed-feeds-calculator.html, with a 5mm dia tool, 10000rpm, 2 flutes, I get 3000mm/min that is a bit fast isn t it? I am not even sure my machine can go that fast.

@Simone_Marin – I always find that F&S calculators assume my machine can move far faster than it can, so I put in my max traverse speed and derive F&S based on that. (I then derate by about 50% because my machine’s not very stiff.)

Exactly this is what I thought still those values seems to be quite off. I ended up at 500mm/min which is a good speed for my machine with the spindle at 14000rpm. First cut so far so good.

I have a metal mill, and am limited both by traverse and spindle speed, so I’ve had to generate my own operational envelope and use that as my entry into a F&S calculator.