CNCCookbook
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Posts posted by CNCCookbook
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Are you climb milling?
Consider trying a conventional pass just to see if it helps. Climb milling tends to deflect the tool into the wall of the cut. Conventional tends to deflect along the toolpath.
There's a diagram showing these deflections on my tool deflection page here: http://www.cnccookbook.com/CCCNCMillFeedsSpeedsDeflect.htm
Cheers,
BW
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Thanks for the great forum!
I gave a callout for eMastercam over on my blog, CNCCookbook:
http://www.cnccookbook.com/index.htm
Of course we get a lot of Mastercam users over there. I also really appreciate the Dynamic Milling Database you're building. I used it to do a little fine tuning on the final release of our HSM speeds and feeds calculator.
We were pretty close on chiploads, but you guys were pushing the SFM quite a bit harder.
Best Regards,
Bob Warfield
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You may be work hardening if you let the chipload get too low because the tool will start to rub. Micro-milling is hard. The geometry at those scales and the shearing behavior is different, so normal speeds and feeds formulas are wrong. In addition, as was mentioned, even a little runout is a big % of the cutter diameter and hence will break cutters.
FWIW, G-Wizard has micro-milling feeds and speeds models based on how Makino approaches the problem and would call for as much as 4 IPM for a slot, 0.003" deep @ 4000 rpm on 0.015" EM. Several of our users are in the watchmaking world and have said they're getting good results with it. That feedrate gives a chipload of 0.0003". If you drop down 0.5 IPM your chipload drops all the way down to 0.00003". That ought to make the tool start rubbing.
Cheers,
BW
www.cnccookbook.com
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Whatever method you use to backup, be sure to test restoration on a semi-frequent basis. IT guys will tell you lots of horror stories of backing up and then discovering when they really needed it, they couldn't restore.
This was a problem for Mozy some years ago (I'm sure they've fixed it!) and I wrote about it:
These days I use a Seagate Black Armor NAS to backup our computers, and then I back up the NAS to Amazon S3.
Having lost a hard disk, found the backup defective, and having sent the hard disk to a clean room to be recovered (they got back everything of value for $$$, but it was impressive), you can't be too careful with your data!
Cheers,
BW
www.cnccookbook.com
PS The Black Armor is so compact, I have thought it would be cool to bury it in a capsule away from the house with just a power and Ethernet connection. A little waterproof container, a little ventilation, and it would be your own little data vault! LOL
MAC OS g code editor
in Industrial Forum
Posted
G-Wizard Editor/Simulator can be installed on a Mac or PC. It's still in Beta test, so not complete, but it is free and a lot of people are using it.
Best,
Bob Warfield