I've had a blast setting up my new AR6 Pro+. One great advantage it brings me is faster cutting speeds and wider RPM range than I had on my old machine, so I got ready to do some test cuts. Good thing I was just "cutting air" for the first test, because I noticed immediately that the machine did not go above 120IPM regardless of my Gcode. After checking the manual I found, under "machine setup", some speed limits. They were set at 3000mm/min (118 IPM); which is weird because the default speed "working speed" is 5000 mm/min (200 ipm). I raised to 6000 IPM and will set whatever feed is appropriate for the bit and material in Gcode. Anyone know why that was the default? should I not expect to cut at 200IPM in soft materials?
Just got my new AR6 Pro+ setup myself. Very cool machine!
Interesting, where did you find this setting? My old Probotix was 30ipm, so I was pretty impressed with 100ipm I was running it at. I don't foresee going any faster and am actually looking at lowering the speed.
Post by Axiom Tool Group on Mar 20, 2019 11:10:35 GMT -5
The machines do have a speed limits setup to rein them in..."so to speak".
This has a lot to do with the fact that stepper motors have a limited amount of torque. And sadly the faster a stepper motor is moved, the less torque they have in which to hold their position.
The max shuttle speed capability of the machines are 200ipm, however, moving at those higher speeds increases the risk of position loss especially if not properly lubricated or maintained. (Not all customers lubricate often or regularly. We often hear that "Well, I haven't lubricated yet..its a new machine that I've only had a little over a year", so we try to account for all working conditions to prevent problems in the field.)
The bearing manufacturer recommends lubricating daily by applying a light machine oil to the ball screw and guides using a clean cloth. Then the bearing assemblies themselves should be serviced approx. every 500 hours of machine time.
The speed limits have been setup to follow along with what we have determined to be the optimum working conditions for most tooling and environments. With the average recommended feeds for most tool-paths being nearer to 100ipm.
The Work Speed listed on the controller should not be programmed to actually effect anything as these controls are set by default to take the feed-rate from the g-code. Unfortunately, the shuttle speeds within the controller affect more than just the X/Y axes...it also directly applies to the Z axis. Since the Z is lifting a heavy spindle...when setting the shuttle speeds too high, the Z axis can stall and loose position where as the X and Y axes are perfectly fin moving at those speeds.
For these reasons, a speed limit has been setup to help prevent accidental slips and headaches.