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CNC Router bits failing - new material3/13
We primary cut white MCP from manufacturer 'A' because we feel the product is superior in core and face finish. We recently have a job where the architect has specified manufacturer 'X' white MCP. We are plagued with issues of ruined bits, sometimes two sheets, sometimes quarter a lift, but certainly not the life we were getting from Manufacturer 'A'. We are cutting using LMT-Onsrud 57-921, 3/8", 2 flute, downspiral; and 60-123MC, 3/8" compression cutters, both running at 18,000 rpm and 15,000 mm/min feedrate. I increased the feedrate to 17,500 mm/min for a 0.020" chipload but same issues. It appears the edges of the bit are wearing away leaving a small ridge just below the melamine finish, and if not changed the bits then overheat. Thoughts? Suggestions? Thanks in advance!
There are melamines that I refuse to cut unless the client agrees to take the chipping edges and pay for the broken bits.
Can you program in an 1/8" up/down cycling of the Z-axis while cutting? If so you might find some improvement by spreading the wear point over a larger bit surface.
It will though mean a deeper undulating cut into your spoil board so you'll need to weigh that against any improved bit life.
Thanks, Davis, that is a great idea to look into for cutting out the part, but most of my issue occurs when machining the tenon and mortise on the cab parts with the 3/8 downspiral, and cycling up and down in this instance won't work. I am looking into coated compression cutter from FS Tool as Dropout recommended that.
Did the architect refuse to consider an equivalent product that you know you can cut successfully?
In one instance yes, and we didn't push back as it was the first job with this particular professional and we didn't want to be seen as questioning the design since we were still feeling them out. They are now convinced not to use again. The other issue is that this is the product the local supplier carries, and they indicate none of the other cabinet shops have complained of the issues we are having??!!?? to go with the product we like to use, we would be overpriced on competitive bids/public bids. we keep the good stuff for our private jobs/negotiated contracts...but now after these issues, cost wise we would have been better to stick with the good material. A lesson learned for sure.
The coated bits will definitely help. The cheaper board has more glue and trash in the board.
Isn't it funny how architects think they know more about woodworking than woodworkers! I had one that insisted that I use their construction method to build a euro cabinet. Between the reprogramming, retraining, and retooling, it added a week to production and another week to installation. Then they complained that we were done two weeks late.
I've since learned never to sign a job that is "overspecified".
how deep are you cutting, if your cutting deeper than 3/8 your going to fast and if your going that deep your up-cut part of the compression is chipping the top edge. we have a easy formula to figure out feed rates it has helped us a ton I can send you if you'd like