Newbie looking at 6040 (China CNC) for polypropylene 15mm sheet

[JAZZCNC]

Hi I have a 6040 machine, and it works very well, someone earlier said acrylic melts, if that's the case then your setting are all wrong, I use a lot of acrylic in my projects and have never had melting. My settings are, for a 3mm bit, !0,000 rpm, 254 feed and 80 plunge.

What units is the 254 value in.? ie: inch/min, mm/sec, or mm/min because if it's either of the first two then I very much doubt you are reaching those feeds? Every Chinese 6040 machine I've ever come across uses 5mm pitch ball-screws and struggles to reach much past 5000mm/min. Your 254 figure if in imperial units would be cutting at 6500mm/min, If it's mm/sec then it's even worse because that would be 15,240mm/min which it couldn't reach if you threw it out the top floor window.!

I see this all the time with Chinese machines in that people enter feeds n speeds in CAM, often the default settings for tool size in software like Vcarve pro, etc, and because Mach3 or whatever control software they are using doesn't complain if it's higher than the max velocity settings they think they are reaching those feeds.!.. They are NOT, and can't possibly because the machine isn't tuned for or even capable of those feeds.

Regards Melting acrylic then it could be because of the type of acrylic, Cast acrylic machines so much nicer than the other stuff which I've forgotten the name of.! The other stuff can be a B'##'#rd to machine and melts for fun IME.!