Quote Originally Posted by Boyan Silyavski View Post
So i don't see 100kg gantry on small machine moven by steppers at that speed. Not to speak of 200kg gantry on 8x6 machine. From what i have read in forums and builds i have looked and studied, people using steppers normally achieve 5000-mm min on a normal build and 10 000mm / min on the better thought builds. I doubt that this 10 000mm /min is really usable with good acceleration on actual cutting, not rapids.
Boyan you are correct that machine with 100kg gantry won't reach 16,000mm/min with steppers but at 100kg it shouldn't be fitted with steppers so should be no surprise.!!

That doesn't mean correctly built and spec'd machine using steppers won't reach 16,000mm/min. most of the routers I build range between 600x400 and 1250 x 700 region and just about every one will reach those speeds. While testing/setup I push them to the extreme limit to find the saturation point where they stall and 20-24mtr/min is not uncommon.
Yes they don't get run at those speeds and I'll whind them back to between 10-15mtr/min rapids. All will happily cut at 10mtr/min if the tooling and material allow for it.

Servos are ok but as you know they also come there fair share of issues and requirements. Servo's while being stronger are not always better and in DIY enviroment mostly not required or recommended. KISS is the key at DIY level and steppers tick all the boxs. Servo's can quickly crush the boxs and frustrate the hell out of people. Also the cost doesn't just stop at the Servo's because again as you know suitable controller and all the correct cabling are required. (before you reply with "use chinese controller" not everyone want's to take this route)


Grambot:
Noise is big concern for most DIY users and can't be avoided because it mostly comes from the cutter not the spindle but it's simply case of enclosing the machine. Just make sure it's well ventilated.

Boyan the movement of your machine was nice to see but the trochoidal toolpath was IMO the wrong choice for this type of Job/material. It would have been quicker roughing in conventional manner then finish pass and much less stressful on the machine.