7' X 4' Combi

[Jonathan]

I wrote a quick bit of G-Code (my first bit of G-Code writing.. (Thanks for the tuition i2i)) just to watch the gantry going back and forth and stopping and starting with small travel and big travel just to see if everthing is how it should be, then copied and pasted it several times, then just watched it run for 45 min

Try this spreadsheet to generate similar G-Code. Especially if you just test one axis, the machine can seem fine from just jogging around at full speed, or repeated code like you tried, but in reality fail a test with random code. The reason is if you just repeat the same commands and run it for a long time, that's not much better than just running those lines a few times since it's doing the same thing every time, so the currents will be virtually the same every time. If they're randomized then over time you can expect to find if there's a problem.

Edit: also what acceleration have you set it to?

[Ricardoco]

Try this spreadsheet to generate similar G-Code. Especially if you just test one axis, the machine can seem fine from just jogging around at full speed, or repeated code like you tried, but in reality fail a test with random code. The reason is if you just repeat the same commands and run it for a long time, that's not much better than just running those lines a few times since it's doing the same thing every time, so the currents will be virtually the same every time. If they're randomized then over time you can expect to find if there's a problem.

Edit: also what acceleration have you set it to?

Cheers Jonathan, I will give that a go, i think i set it to 1000mm sec i will have a check tomorrow.

Rick

[Ricardoco]

Ok more snippets, Sorted the tuning and did a video, the initial G28 move is at 8m Min and the rest is at 7m Min. and this is a boring video but here it is anyhow.

I actually played with the max feed and had to turn up the kernel speed but got to 13m Min with no problems but I was a bit worried about the amount of torque drop of so backed it off to 8m for nice rapids. Does any know if there is a graph that shows the torque drop off related to rpm of these 4nm nema 24 motors, i cannot find it anywhere..

Rick

[GEOFFREY]

Great stuff Rick, now lets see some swarf/sawdust. G.

[Ricardoco]

Great stuff Rick, now lets see some swarf/sawdust. G.

LOL the bed will be cast next week and then there is the Y to mount and that will be after the Z backplate arrives.. So its all in flux, Im waiting for the Drag chain, grommets, inline plugs, and the proximity sensors to arrive, then i can chase all the wiring through the frame and through the drag chain (damn that stuff is expensive) there is a bit of welding under the frame to be completed for the shelves for the vacuum pumps, and the dust sucker, the coolant reservour, compressor,VFD, and plasma . But im going as quick as i can cos i want it going..

Rick

[GEOFFREY]

Sorry Rick, I thought you were a bit further down the line than that. I had not realized you still had so much to do, but at the speed your'e going at it won't be long now. G.

[Ricardoco]

Well there is a lesson learned!!.

Today I fitted the drag chain, and spent two hours drilling, and routing the cables through the frame back to the control box, Oh how neat it was, i fitted three bright new NPN-NO-6-36v proximity sensors to the X- Axis....LOL oh what fun that was.

Evertime i powered up the driver a sensor triggered, I didnt know what was going on.

I had used some 5 core cable for the steppers leaving 1 spare wire in each cable for the sensor, I had already run some wire up to the gantry for the sensor supply..

So now that i know i will have to use Screened cables on the machine so i dont get all these stray signals.
Can anyone suggest a four core screened cable that wont rip my arm off please, as i will wire the whole machine with what ever i get.

The drivers are 2MA860H Peak 7.2A AC50V-80V DC36V-110V running at 72VAC driving 4NM NEMA 24 Motors

Rick