CNC router X axis test run with Clearpath servo 

3.125m/min and 7.620m/min though.

Same, with that amount of inertia it must to be bolted down

No gearbox, but there is a 3.2:1 reduction (belt drive) in the drive assembly I'm using: www.avidcnc.com/pro-rack-and-pinion-drive-nema-34-p-226.html

with a clearpath servo driver of course. gcode isnt a driver its instructions. software just creates the instructions. the CNC controller translates those instructions for the servo driver which by name drives the servo.

I would guess that the answer is no, but you'd have to ask Teknic.

It is based heavily on the CNC Router Parts Pro series machines, so you can refer to their documentation (which is quite good) CNCRP uses metric extrusions, while I used 3060 (3"x6") for X. The linear rails are 20mm.

If I'm doing the math correctly, I came up with an inertia ratio of 1.54. 1" pitch diameter drive pinion, 3.2:1 drive ratio (motor to pinion), 11.4 oz-in^2 rotor inertia (clearpath 3432S-RLN), and I'll call the total load weight ~45lb (720oz).

@@funkenjaeger Nice

I'm interested to see how they fare thermally once I start doing test runs at the machine level. They do have mounting provisions for cooling fans, which I may add.

thats why fans exist.

I've run it at up to 1G, which the servos handled - but that's pretty violent. I usually run at more like 150 in/s^2 (0.39G)

@@funkenjaeger Ok so 16kg X 10m/s/s/ is 160N. For a 5mm ballscrew pitch you would need only 0.13Nm of torque which is nothing for those motors. Probably the peak torque is 4Nm and that would allow you to create for short amount of time when acceleration to speed is needed about 5KN of force. So that would be close to 30G

@@car9167 Perhaps, but that seems like somewhat of an academic exercise. In my experimentation I pushed the motors to levels that were practical for my machine chassis - I didn't attempt to find their absolute limits in terms of acceleration. To take advantage of that level of acceleration, you would need a machine chassis designed from the ground up to handle it, and frankly I think that such a chassis would need to be constructed rather differently than this type of aluminum-extrusion-based CNC router. When I said that 1G acceleration was 'violent', that was in the context of what it was like to actually run the overall machine at that acceleration level through an adaptive (trochoidal) toolpath. I did some back-of-the-envelope calculations of how much benefit I'd really get from running high acceleration on the types of toolpaths I typically do - and frankly even 1G was well past the point of diminishing returns. With a 500 ipm (12700 mm/min) feed rate (quite aggressive for anything but the softest materials), 1G accelerates there from a stop within a distance of 5mm - so if you were machining a part with a lot of features smaller than 5mm (or using a toolpath that results in a lot of short moves, e.g. trochoidal down a relatively narrow slot) then higher acceleration could benefit you. That's rarely the case for me though, so I don't find it worth the trade of pushing the machine hard enough to shake it violently for minimal benefit in machining time.

@@funkenjaeger Completely agree with you. I was just curious how far from the theoretical value you can go but you can't with your machine/fixture. Understandable. It would be used only for positioning, nobody goes that crazy in machining mode. My servos are 1.8KW but I'm moving 3-400Kg.

I would like to know as well. What specific servo did you use from clearpath? I have been interested for a while in building a CNC with these servos. Thanks and good work!

@@derekrussell9925 Read the description...