Hi,
I have an old esab gas cutting gantry which i have modified for cnc, i doubled up the motors on the x axis and left the y alone.
I got asked to cut some really fine parts the other day and found my quality on really small parts at high speeds was poor so i satrted studying my motion more, normally i cut large parts at low speed so i never see this.
The motors are electrocraft e586's, they appear to be quite high inertia, initially i found that if i came under 1500mm/min then my motion results improved alot, faster than that and the lines were a bit like saw teeth, if i reduce my acceloration vales from 0.040g down to 0.020g i saw the quality improve at higher speed, mainly because even though the feedrate was set higher it never acheived it.
I then started looking for backlash, on my x axis i found i had to command a move of 0.05mm to see a response, on the y it was more like 0.03mm, is that alot? or nothing to worry about?
It seems as though just jogging the machine around at high speed if if is allowed to reach full speed then it will stop smoothly but if full speed is not reached before it is stopped then the machine oscillates to a stop, is the backlash causing this?
I also read some stuff about inertia matching so i installed the motioneering program and mdelled my motors and mechanism as well as i could and it appears as though the motor and gear ratio are almost spot on, if i increase or decrease the gear ratio the torque and power requiremnets seem to go up, presumably this is the sweet spot?
Where do my drives fit into this? I have whale drives from cncdrives and ive never liked the tuning software, i find the usb connection troublesome and have never seemed to really get the system right, do the drives make a difference to the system?
I hope you can give me some clues
Matt