here it is
jim
here it is
jim
Hi Jim,
Thanks for this. What units are the feed rate in?
Cheers, Ben
i used it this week and it is in inches
James McGrew CAMaster 508 ATC
www.mcgrewwoodwork.com http://dropc.am/p/EJaKyl
here is another calculator near the bottom of the page just download "cnc toolkit" and go to tools
Josh Glenn’s Blog » DIY-CNC Tutorials
James McGrew CAMaster 508 ATC
www.mcgrewwoodwork.com http://dropc.am/p/EJaKyl
Hi Guys,
Thanks very much for all the info. Its great. Would any of you know of a speed / feed calculator that is metric?
Cheers, Ben
I entered some numbers in the XLS file
Enter desired chipload: .035 (for natural wood)
Enter RPM: 10000
Enter # of flutes: 2
Feed rate = 500
Is the 500 "inches per minute"? I don't even think my DIY can do 500 ipm rapids, much less cut at that speed. And that's on the low end, my Porter Cable 690 variable speed does 10,000-27,000 rpm.
.035 is a very high chipload, much too high for solid wood. So yes, 500 would be ipm.
However, with most 1/4" tools, cutting hardwoods, a chip load of .003-.007 would be more common.
Chiploads over .015 are probably more than most handheld routers are capable of, or are nearing the limit.
Gerry
UCCNC 2017 Screenset
http://www.thecncwoodworker.com/2017.html
Mach3 2010 Screenset
http://www.thecncwoodworker.com/2010.html
JointCAM - CNC Dovetails & Box Joints
http://www.g-forcecnc.com/jointcam.html
(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
Thanks, I was looking at the recomended chip loads for hard and soft wood on the Onsrud site for Ø1/4" bits. The maximum chip load is .017 on some bits, but most of them are .009 or under.
Onsrud chip load charts
Some other useful tips on there:
To increase your chipload you can:
Increase the feedrate
Decrease the RPM
Use less flutes
To decrease your chipload you can:
Decrease the feedrate
Increase the RPM
Use more flute