Thread: Carbide CNC bits cutting life?
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14-07-2018 #1
Hi.
I am cutting furniture out of 12mm MDF using Straight 6mm 2 flute carbide bits.
I usually take 4 passes (3mm each). The bits last on average about 80 mins before sounding 'wrong' and emitting burning smell.
Is this about right? or should they last longer. I have tried various ones from UK and from China, but they are all about the same.
Just wanted to know if this sounded normal, or wildly out.
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14-07-2018 #2
If it's burning, then RPM is too high, or feedrate is too low. Either causes excess heat, which dulls tools faster.
I'd make 2 passes at 6mm per pass, too.Gerry
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UCCNC 2022 Screenset
Mach3 2010 Screenset
JointCAM - CAM for Woodworking Joints
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The Following User Says Thank You to Ger21 For This Useful Post:
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14-07-2018 #3
Thanks Gerry.
But when I touch the blade after it has stopped. Its not even slightly warm. I only smell a slight burning when it has got near the 80 mins use.
The ones from China are about £3 each, so maybe that isn't so bad?
btw, the spiindle is running at 23,000rpm. I was advised by the manufactured of the CNC machine to go that speed for MDF.Last edited by Millatime16; 14-07-2018 at 08:11 PM.
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14-07-2018 #4
What feedrate are you using? I cut 12 meters/min at 17,000 rpm. 23,000 is likely way too high.
Gerry
______________________________________________
UCCNC 2022 Screenset
Mach3 2010 Screenset
JointCAM - CAM for Woodworking Joints
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14-07-2018 #5
I will check tomorrow. The manufacture set it all up. Is it shown in the MACH 3 software?
(The RPM is set on the Kress spindle itself).
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14-07-2018 #6
What is the power of your spindle and what feeds and speed are you using. I have been cutting 9mm mdf with a 3mm alibond on top and using a single flute 4mm carbide with 6.5mm doc and about 3.5 mtr/min without any problems spindle speed 2200rpm 2.2 kW I think we did about 15 8x4 sheet with many profiles within in one day
Edit these are the bits :- https://www.ebay.co.uk/itm/4mm-SOLID...1e30%7Ciid%3A1Last edited by Clive S; 15-07-2018 at 07:59 AM.
..Clive
The more you know, The better you know, How little you know
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14-07-2018 #7
Its a Kress 1050.
Where do I find the feed rate etc? I only know the basics of MACH 3 so far. (Its an A1 machine).
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15-07-2018 #8
Spiral bits are generally better for CNC use, as they evacuate the chip (upcut bits) and surface edge finish can be superior.
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