New set of problems

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18 May 2024 02:15 #300886 by phillc54
Replied by phillc54 on topic New set of problems

Still uses the toma_thc config

That is a great piece of HAL work...

Sorry for hijacking the thread ACourtJester.

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18 May 2024 02:37 #300887 by acourtjester
Replied by acourtjester on topic New set of problems
Thanks for the info and the help with these things I hope to get all the thing sorted out soon.  I am using a Hypertherm PM65 for my Plasma unit.  Here is the tool list from SheetCam there are some optional tools for router and code snippets that need to be removed. They are mostly near the end of the list.  
 

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File Name: SheetCamtool.zip
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18 May 2024 07:38 #300895 by phillc54
Replied by phillc54 on topic New set of problems
I just ran the SheetCam tools through the qtpslasmac-materials converter in imperial mode and it appears to work correctly.

The only tools with a pierce delay of zero are 1, 4, 15, 15, and 16 which is correct as they are zero in the SheetCam file.

The converter does not attempt to convert any tool that is not a SheetCam PlasmaTool so there is no need to delete them from the SheetCam file before converting.

 

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File Name: Default.tools.cfg.txt
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20 May 2024 20:32 - 20 May 2024 20:34 #301031 by acourtjester
Replied by acourtjester on topic New set of problems
To give you a progress report, I did change the THC delay back to 1.5. I had a brain fart with the .2. I remembered with other THC that is what I had used.
The big change was when I removed the cable shield of the signal cable from the star ground connection. On some of the tables I built in the past some needed that connection and other did not. Just one of those odd things with noise problems.
Once again thanks to you guys for all your time and advice. I think the last problem I have is a bad servo motor, it dose not move smoothly. It was part of a $1100 upgrade to my table.
drive.google.com/file/d/1f75krEVchyOTcsl...A2l/view?usp=sharing
Last edit: 20 May 2024 20:34 by acourtjester. Reason: spelling
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20 May 2024 22:34 #301039 by tommylight
Replied by tommylight on topic New set of problems
Sorry but i can not figure out anything from that video, can you do one while moving under power?
And are those stepper or servo motors?
I have to ask as ClearPath servos were not servos at all a few years back, just steppers, some with encoders.

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21 May 2024 03:01 - 21 May 2024 03:04 #301051 by acourtjester
Replied by acourtjester on topic New set of problems
These are servo motors
ClearPath Integrated Servo MotorCPM-SDSK-2321S-RLN2$610.00 
ClearPath Integrated Servo MotorCPM-SDSK-3441P-RLN1$432.00 
The one that is giving me a problem cannot hold a constant speed and this causes a problem with the THC due to changing speed see in this  video of a straight line cut.  It makes the torch bounce up and down due to speed changes.
drive.google.com/file/d/1B-0kLopIEspzgQS.../view?usp=drive_link
If I change the direction to the other axis it cuts fine no bouncing up and down.
Last edit: 21 May 2024 03:04 by acourtjester. Reason: spelling

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21 May 2024 12:36 #301079 by acourtjester
Replied by acourtjester on topic New set of problems
To explain what I was trying to say is a stepper motor and these servos will generate voltage when moved without power. With no power on if you move an axis it will make enough of a signal to for a very short time try to stop your motion, then release it to move again. This is similar to rolling down hill in car and taping the brakes from time to time. In the first part of the video it shows that action and the second part that does not happen.
Try this on your table with the X or Y axis without power, moving at a moderate speed. You will feel this stopping action for an instant then release.

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21 May 2024 14:50 - 21 May 2024 14:52 #301085 by tommylight
Replied by tommylight on topic New set of problems
Not servos, just have a look at the torque graph, steppers. At least they seem pretty good quality.
That does not help you at all, except maybe buying the cheapest drive/motor you can find and replace the misbehaving one. Might only need to change the scale as i would assume the existing ones use high microstepping.
Do those have encoders? That is the only thing that might cause such behavior, namely, the encoder has a rusted slot wheel, and if so that would be worth trying to fix.
Last edit: 21 May 2024 14:52 by tommylight. Reason: more info

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21 May 2024 16:56 - 21 May 2024 16:57 #301092 by RDA
Replied by RDA on topic New set of problems
They are BLDC motors with an integrated servo amplifier. They close the loop between the drive and motor but they do not output the encoder signals. There is an option to get a pretty crude pwm output that is linear with the speed, but I would not use it for feedback that has to be precise.
Yes I have used them and no I don’t like them that much.
Last edit: 21 May 2024 16:57 by RDA.

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21 May 2024 18:05 - 21 May 2024 18:27 #301095 by tommylight
Replied by tommylight on topic New set of problems
Did you see the torque curve?
Those are not servos by any stretch of imagination.
So no, they are not BLDC servos, although steppers can also be seen as BLDC motors, just 2 phase.
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Torque curve shows steep drop of torque as the speed rises, indicative of stepper motors, max speed is 1700RPM at 75V, not usable at all above a certain point (forgot, on the phone), and does 700 or 800 max RPM at 24V, again not usable above probably 300RPM as the torque drops considerably.
The drives probably use high microstepping to lessen vibration, so what is the step rate per rotation on them?
I really hope they do not use pulse multipliers....
Edit:
Forgot to add, servo motors of similar size spin easily at 4000 to 5000RPM without much loss in torque.
Last edit: 21 May 2024 18:27 by tommylight. Reason: more info

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