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#1
 
03-30-2005, 08:24 PM
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Hey guys...... I was milling wood tonight ( a plug for an rc airplane wing) with a .25 2 flute upcut bit, 13000 RPM, cuttin beautiful..... I was inside when I heard something sounding differant and the machine was going but the bit had broken.... Well I looked at my G-Code and I cannot find a problem.... Im just stumped... Any suggestions what to look for ? Would you run the code again or recode the part ? The 'crash' by the way was a shallow cut 1/2" long and about .25 deeper than the rest..... it shouldnt have even broke the bit really - Im stumped....
__________________ Persistance and patience are the key to CNC  |
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#2
03-30-2005, 08:38 PM
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| What kind of wood? Feed speeds? Depth of cut? What brand bit?
__________________ Gerry Mach3 2010 Screenset http://home.comcast.net/~cncwoodworker/2010.html (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management) |
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#3
03-30-2005, 08:59 PM
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| I was milling plywood - about a .35" depth of cut, 13000 RPM, 2 flute bit - made by Porter Cable..... The plywood is the 3/4" 9 ply stuff at home depot - not the cheap stuff - imported 'sand ply' as theyu call it - good stuff,pretty hard... Also - I was running at about 50 IPM, and the step over was 25% (.0625") I have to order a new collet now - it marred my collet some..... so I need to figure out what happened.....
__________________ Persistance and patience are the key to CNC Last edited by ninewgt; 03-30-2005 at 09:20 PM. |
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#5
03-31-2005, 06:15 AM
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| It looks like the bit came loose in the collet. If it had just snapped it wouldn't have cut deeper. On our router at work I use these: http://www.vortextool.com/standard/p...fm?groupID=264 #1830, If you buy 5 they are $77 for 5. I usually cut around 120ipm @19,000 RPM (for the 1/4" tool), and try to keep the depth of cut to around 1/4" . The 3 flutes cut a little nicer, and they are quieter.
__________________ Gerry Mach3 2010 Screenset http://home.comcast.net/~cncwoodworker/2010.html (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management) |
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#6
03-31-2005, 07:23 PM
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| Well I tacked a piece of foam down (2" styro) and ran the part file - came out fine... so ??? Who knows - maybe some electrical noise, the bit just broke... who knows....... I wish Id have been watching when it ran over the same area - but it cut perfect so no worries
__________________ Persistance and patience are the key to CNC |
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