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Feed and speed and breaking bits

Hi guys, I’m relatively new to the CNC world and have been struggling to get a consistent profile cut through 18mm melamine faced MDF.Im using the Z1+ with the Mafell milling motor and Carveco Maker as the design software.I have recently broken a 1/4 Amana Down cut bit after reducing the feed rate from 70ipm to 50ipm ( 18000 rpm ) although I’m unsure wether or not the stress may have been caused prior to this reduction.Im also finding that when I use a 1/4” compression bit , the bit is being pulled from the machine. The machine is also making a loud screeching sound , however i’m not sure if this is normal or not.Has anyone got any experience cutting this material that can offer me advice on what speed , feed and bit I need to be looking at.Also, should I be altering the recommended rates for the end mills in the Carveco Maker software to suit the Workbee ? Thanks.

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Hi Paul,

Thanks for your question. Using a compression bit is quite advanced, so I would stick to down or upcut for now.

What pass depth was you using with that down cut when it broke?

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Thanks Robert, I had reduced the pass depth to 4.75 from 6.25 as I thought that may have been causing stress on the bit.I suppose it is possible that the damage had already occurred prior to reducing the depth and speed. Can you recommend what feed , speed and depth I should be looking at whilst using a Z1+ with a down cut bit ( Amana 46415K ) whilst cutting through 18mm Melamine Faced MDF? I have read that I should reduce the figures supplied by the manufacturer of the bits as they are more directed at commercial grade cnc machines.As previously mentioned I reduced the feed from 70ipm to 50ipm but Im now thinking that this caused the bit to over heat as the spindle rate was just shy of 18000rpm.

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Hi Paul,

Thanks for your message. 4.75mm is still too high pass depth in my opinion. I would reduce it down to 2mm. Then run it at 2000mm/min, 18k RPM.

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Author avatar Paul Mckeever will be eternally grateful.
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