Feeds and speeds software?

[Boyan Silyavski]

Difficult to say without knowing the machine. The sturdier the machine the deeper you can go and faster, the idea is also to make it happen faster or it will melt. I hope you know this is not the cutter for the job?
Anyway, i would not go deep - 1mm or less and with a sharp cutter and machine with supported square rails the program says 15000 RPM and 3800mm/m for 2 flute cutter, so double that up for a 4 flute cutter.
On a flimsy machine with v bearings and belts i cut it for sure without any problem using much more slower RPM /6000/ and much slower feed / 40ipm/ but you know the chatter heats a lot things up, so that's why.

So you see, depends on the sharpness of the bit, the ability to clear chips and the rigidity of the machine. The bad thing with that plastic is that until you figure the real speed the bit clogs and usually brakes. Thats why start very shallow and when you are sure that the cut is at its best then go deeper. Some air cooling definitely is a game changer

[Rye]

Hi mate,

It's a Chinese 6040 with 1.5k spindle (seen on ebay). I realise the 4 flute isn't best option, but was itching to give the 4 flute a try on a practice piece while I wait for the new bits to arrive (most have arrived except for the ones I need).

It cut reasonably well @ 16000 RPM with a FR of 550 - taking 1.8mm on each pass(except the last). Things did heat up though; had hot chips everywhere, but no clogging.



I'll take note of your comment and sort another piece to practice on. And if I can afford a can of air, I'll use that too. If not I'll have to suck on a polo and blow on it :)

[Clive S]

It cut reasonably well @ 16000 RPM with a FD of 550 - taking 1.8mm on each pass(except the last). Things did heat up though; had hot chips everywhere, but no clogging.


I'll take note of your comment and sort another piece to practice on. And if I can afford a can of air, I'll use that too. If not I'll have to suck on a polo and blow on it :)

Hot chips are good as they keep the tool cool.