New build with recycled parts on a ridiculous budget 120cm*60cm work area

[Desertboy]

Mr Postman arrived with a package from China for me can be only one thing ;)

Won't be back at work till 1pm but shouldn't take long to fit it, test it. Then drill the box and fit grommets for the nema's, limit switches, mains input & spindle output's, fit the box, fit the plate in the box and finally fir the wiring to the board lol. Hoping to get it all done today then tomorrow, get a sheet of mdf for the bed and start configuring the machine. Be nice to get the bed milled flat and vacuum holes drilled over the weekend.

I have a a few things I would like to build out before the end of the year and I'm starting to believe I might just get at least some of them built ;) Not long now.

e2a was my AM882 in the post dropped it on the machine and tested it works fine ;) I know have 4 moving axis and my Y axis is linked up. Took me some head scratching in Linuxcnc and editing the .hal and .ini files probably click a button in Mach 3 lol.

Tomorrow I can get the box finished and start with homing.

[Desertboy]

Long time coming but finally she moves using the AM882's and the Toroidal PSU from linuxcnc ;)

https://www.youtube.com/watch?v=JH7ISQcmeUM

At the moment I auto tuned the steppers (Hopefully, flick the SW4 switch on/off/on with rotation knob in 0 position) and set microstepping to 2 just to get it working but will get it set it properly next couple of days.)

What microstepping do others use for their AM882's? I was thinking X16.

[Neale]

What microstepping do others use for their AM882's? I was thinking X16.

I use x8, with EM806. That's with NEMA23 3Nm, 5mm lead ballscrews, 1-1 pulleys. Seems like a good compromise between smooth running, resolution, and maintaining torque. Gives me about 5000mm/min rapid, which is slower than some people but the max I can manage with my ballscrew length.

[Desertboy]

8X it is ;) do the motors get quieter the more microsteps you have? When I first ran them one of the motors was virtually silent.
https://www.youtube.com/watch?v=O4_u5ov-9cc

Ordered a 720p webcam to set a timelapse up so I can record my mistakes ;)
Did you use the auto tune function on the EM806? Wondering if I did it right, flicked the SW4 switch on/off/on you hear some minor buzzing sound for a second and it's done. Does this sound correct?

[Neale]

Certainly a non-microstepped motor seems to run really roughly. I haven't studied it that closely, though - that was on a different machine which had been set up without microsteps for initial testing. The other thing to take into account is the pulse rate you can get out of the driving PC, though. Too many microsteps and you can't drive the pulses fast enough for decent speed. However, most people seem to be using external motion controllers these days which takes that whole issue away.

I did play with the autotune, although I was never quite clear about whether it should be done on load, and if so how you handled the case of a master/slave axis setup. Not a lot seemed to happen, though, and I have no idea whether or not it made a difference! I just use the machine, and it seems to work fine as it is. Might not be optimum, but I'm not sure what difference tuning makes. No apparent resonance over the speed range I use (typically cutting at around 3000-3500mm/min in wood or polythene) and 5000mm/min rapid. I guess that the ideal tune might allow slightly higher accelerations, but like a lot of people I just tweaked and tested until I had reasonable and reliable results.

Good luck - you seem to be getting close now!

[Desertboy]

I forgot to mention I fitted the BK12 fitting the wrong way round on the X axis and it was squeaking when I tried to move it, lubricated the hiwin's and ballbscrews a couple of times before I realised lol.

Swapped the BK12 fitting opposite way round and all good ;)

[Nr1madman]

I forgot to mention I fitted the BK12 fitting the wrong way round on the X axis and it was squeaking when I tried to move it, lubricated the hiwin's and ballbscrews a couple of times before I realised lol.

Swapped the BK12 fitting opposite way round and all good ;)

Damnit! Is there a wrong way :D I have one squeaking ! Have to check orientation.. good find hehe

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