Messages

61

General Mach Discussion / Re: Old one, Radius is different end of arc from start blocked.....

« on: February 29, 2020, 09:01:43 PM »

Hi Graeme,

You will see mate I tried that. And was unsuccessful. Not sure whats going on here - I have tried everything that I have come across in research to do. My machine has been so good until this problem.

Whats strange is the third computer I redrew this up on created a code I can use. I guess I still need to get to the bottom of this. B

62

General Mach Discussion / Old one, Radius is different end of arc from start blocked.....

« on: February 28, 2020, 09:24:17 PM »

I have no idea why? Drew this up in SharkCad, Cambam next. I tried changing the IJ to inc to see its already there.

Have absolutely no idea how to fix this instead of redraw it in Cambam. Would be nice not too have too?

Gcode below if someone can help, would appreciate it a lot. Sorry not allowed to paste all the code so attached the file. B

63

General Mach Discussion / Re: Has anyone wired 4 lead steppers with 3 leads?

« on: July 20, 2019, 01:55:43 AM »

Thanks for that. Hey BTW - I found the Ardunio was only able to run a stepper very slowly for some reason. I tried changing the code but it seemed limited. The $40 Chinese controller - perfect.

64

General Mach Discussion / Has anyone wired 4 lead steppers with 3 leads?

« on: July 19, 2019, 07:26:39 PM »

As above question - I have a lot of 3c wire around. I am automating my Tenoning machine with one stepper and a Chinese controller. The setup will work, but I need about 4m of 4C cable to go from the driver to the stepper.

So what is stopping me from wiring up my Nema 23 4 lead motor to the driver but sharing the negative leads? In effect a common and only needing a 3C cable. Am I missing something about steppers that means they need to be seperate?

Rgds

65

General Mach Discussion / Re: Stepper motors that shudder.

« on: July 10, 2019, 09:21:55 PM »

I thought I should update this post for anyone who is losing steps. Because lets face it - nobody likes losing steps, the sound is like hurting kittens. Especially when you are way way down the end of your table and to re-home the gantry is to go ALL THE WAY BACK again. ha

I upgraded my power supply to a 60vdc (semi adjustable) 1000w Chinese one for I think $100. All my drivers faulted out - they really dont like the higher voltage. So when I popped it down to 50vdc they stopped faulting. And I have a large improvement in the performance of my motors.

Off memory my drivers are DM542MA.

So thanks Craig, and I think Gerry as well had an input.

66

General Mach Discussion / 2010 screenset probing question

« on: June 13, 2019, 07:06:38 PM »

I love the 2010 screenset - I dont think my question it about it particularly. But when I use the probe function to zero my tool against a workpiece, the program changes the machine coordinates as well.  So the fixed tool plate is no longer in the correct place, soft limits no longer work, because the machine seems to home to the new zero.

Know what I mean? What am I missing here?

Regards Boyd

67

General Mach Discussion / Re: Slaving closed loop stepper motors

« on: April 19, 2019, 11:44:04 PM »

Yep. I actually think there was a mistake, very small in the mechanical production on these motors. A shame really, they perform well. Except for the inaccuracy haha.

Thanks for the link. I have pulled off the rouges. And will look at the upgrade when I feel like working on my router again.

68

General Mach Discussion / Re: Slaving closed loop stepper motors

« on: April 19, 2019, 09:11:30 PM »

Hi Craig. Well, I am the guy with the hair of a wire inserting 230vac into my system. So popped everything.

The machine was working but I wanted more speed, so when purchasing more drivers etc I upgraded. The closed loop steppers gave that speed without losing steps, its just they are inaccurate, but inaccurate with the same difference exactly whether its over 500mm or in the case of a job that went bad a hour operation (wasnt watching).

I guess I need to reclarify, these steppers are not losing steps. This I say because they are exactly the same, every time. Almost like the resolution settings are out. But I have set the resolution to what it should be. And even changed it to get the same incorrect results. 2000 steps, 5mm pitch, 400 steps per mm. Or, 1600 steps, 5mm pitch, 320 steps per mm. But I am getting something like 320 steps per 0.99998mm (guess) or in the case of 2000steps, 400 steps per 0.99998mm.

Now I could work out the proper maths to change the settings to get this setup perfect, but it just seems wrong to change the parameters from factory to suit the needs if you know what I mean. Something is not happy. And thought someone here may have the solution. If I need to I will go back to open loop steppers.

69

General Mach Discussion / Slaving closed loop stepper motors

« on: April 19, 2019, 08:12:41 PM »

I have bought a couple of closed loop stepper motors off StepperOnline. Chinese company. This is to replace the Chinese steppers I have been using for many years.

Very strange issue though, and thought I might post here to see if anyone else has had a problem with closed loop slaved steppers losing steps. Yep, but not very many, lets say 1mm over a span of 500mm increasing exponentially.   (ooh did I spell that right? Ha)

System has the A axis slaved off the Y - and I think, this is the problem. Although I cant confirm that unless I put one on my X axis which I am reluctant to do.

But I have troubleshot this system to death (apart from the above). Infact to the point of hooking the drivers up to their stolen software (off Leadshine) to double check the resolution settings of the encoder and also the driver. To no avail, I get exactly the same fault. The closed loop steppers are cool, if I overcome them on standstill, they will drive right back to where they were. So thought I would post here prior to pulling them off.

Boyd

70

General Mach Discussion / Re: Stepper motors that shudder.

« on: April 02, 2019, 08:35:28 PM »

in your case
425 oz.in. Inexperienced buyers tend to focus of holding torque. Savvy buyers on the other hand look for the inductance
of a motor, the lower the inductance the better because the motor will run faster with less torque degradation.

Craig. Now that, is a fantastic piece of writing. That, is EXACTLY what was in my mind when I bought my motors. "Oooh yeeer, gotta be 425oz.in or they cant be any good" Ha. Ok I am armed with some good information and will go forth to bring my gantry into line.

Many thanks