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Looking for a freelancer to assist in drawing schematics for cnc plasma table
- rodw
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06 Dec 2025 13:46 #339794
by rodw
Replied by rodw on topic Looking for a freelancer to assist in drawing schematics for cnc plasma table
It is indeed a long list.
Where in the world is this table going to be built?
I noticed RS485 specified for servos which is not suitable.
I share others concerns about gantry weight but don't know table size.
I have built complete plasma controllers that were shipped to the customer previously and selected motors and gearboxes etc.
ref:
In the absence of PM;s here, you can contact me in the first instance via the email on my YouTube channel
www.youtube.com/@MrRodW
Where in the world is this table going to be built?
I noticed RS485 specified for servos which is not suitable.
I share others concerns about gantry weight but don't know table size.
I have built complete plasma controllers that were shipped to the customer previously and selected motors and gearboxes etc.
ref:
In the absence of PM;s here, you can contact me in the first instance via the email on my YouTube channel
www.youtube.com/@MrRodW
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- NWE
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10 Dec 2025 04:45 #339935
by NWE
Replied by NWE on topic Looking for a freelancer to assist in drawing schematics for cnc plasma table
I might be able to help some, if I can find the time. I can't provide a comprehensive package like your list asks for, but here is a start.
For the limit switches I suggest Automation Direct part number AAM2F43Z11, I like to set them up in a drive-by configuration, where if the axis over-runs its hard stops a bit you're not crushing the switch. If any of these will be used as homing switches you should replace their snap action contact blocks with the teasable version: Automation Direct part number AGX11-SWITCH, I used that in a project a while back and it worked great.
You probably need 6 limit switches for the X and Y axis total. How about the Z axis? What does that one look like? I might suggest just one upper limit switch for that. The bottom limit is going to vary depending on your table height and workpiece thickness. Does your torch holder have a collision sensor to detect when it runs into a protruding edge, like when a smaller piece tips sideways?
For the cords from limit switch to control cabinet I would suggest something like:
Automation Direct part number CC600-16-3S-1 You don't want to use this for circuits that need to flex all the time. I would use this wherever it can be strapped to the frame, etc.
For any limit switch cords that have any flex points or travel through a flexing cable tray I would use something like Automation Direct part number A3131603-1
Both cords are shielded. I would probably use only the second one on the entire project. In applications like this, I like to route the low voltage signal wires through a separate conduit, not the same one as your h.f. power cables. If strapping to the frame, bundle them separate and keep the two bundles separated by several inches, and don't cross them directly over each other. Ground the shields only at the computer end and isolate them at the switch end.
You don't have to get everything from Automation Direct. It is a supplier I use a lot, so I will end up referring to them frequently.
Drawing wiring diagrams is fun. Mostly I sketch them up using paper and pen. Maybe sometime I'll find time to learn how to do it in Qelectrotech.
For the limit switches I suggest Automation Direct part number AAM2F43Z11, I like to set them up in a drive-by configuration, where if the axis over-runs its hard stops a bit you're not crushing the switch. If any of these will be used as homing switches you should replace their snap action contact blocks with the teasable version: Automation Direct part number AGX11-SWITCH, I used that in a project a while back and it worked great.
You probably need 6 limit switches for the X and Y axis total. How about the Z axis? What does that one look like? I might suggest just one upper limit switch for that. The bottom limit is going to vary depending on your table height and workpiece thickness. Does your torch holder have a collision sensor to detect when it runs into a protruding edge, like when a smaller piece tips sideways?
For the cords from limit switch to control cabinet I would suggest something like:
Automation Direct part number CC600-16-3S-1 You don't want to use this for circuits that need to flex all the time. I would use this wherever it can be strapped to the frame, etc.
For any limit switch cords that have any flex points or travel through a flexing cable tray I would use something like Automation Direct part number A3131603-1
Both cords are shielded. I would probably use only the second one on the entire project. In applications like this, I like to route the low voltage signal wires through a separate conduit, not the same one as your h.f. power cables. If strapping to the frame, bundle them separate and keep the two bundles separated by several inches, and don't cross them directly over each other. Ground the shields only at the computer end and isolate them at the switch end.
You don't have to get everything from Automation Direct. It is a supplier I use a lot, so I will end up referring to them frequently.
Drawing wiring diagrams is fun. Mostly I sketch them up using paper and pen. Maybe sometime I'll find time to learn how to do it in Qelectrotech.
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- NWE
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10 Dec 2025 04:56 #339936
by NWE
Replied by NWE on topic Looking for a freelancer to assist in drawing schematics for cnc plasma table
I looked at your long list again. My opinion is a.i. bots frequently over engineer a lot of insignificant points.
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10 Dec 2025 05:23 #339937
by NWE
Replied by NWE on topic Looking for a freelancer to assist in drawing schematics for cnc plasma table
I see you suggested these servo drives:
www.aliexpress.us/item/3256808075045002.html
I like the idea, but the only ethercat products I have experience using with LinuxCNC so far, is Beckhoff products. If these drives are compatible with LinuxCNC, I say go for it. I bought a similar ethercat servo last year. It is still patiently waiting for me to try it out. For the weight of your machine, if you use the 1000W size, I am sure you will not be sorry you went with that. It will help increase the acceleration/deceleration speeds when jumping from one cut to the next. Can make a huge difference when you get to cutting lots of small parts. Tomorrow I might have a chance to look at a Messer plasma table about this size when I'm out on another project, I will see if I can check what size motors it has.
You will probably want to power the Plasma table control cabinet using 240 volts AC (220).
You will probably want to power the Plasma table control cabinet using 240 volts AC (220).
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- NWE
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11 Dec 2025 03:12 #339969
by NWE
Replied by NWE on topic Looking for a freelancer to assist in drawing schematics for cnc plasma table
I got my chance to look at the motors on that Messer plasma table I had mentioned. It has Bosch Rexroth Indramat servo motors:
The X, X-slave, and Y axis each have a MSK050B-0600-NN-M1-UG0-NNNN which is a 600 watt motor.
The Z axis (torch lifter) has a MSM031C0300-NN-M5-MH1 which is a 300 watt motor.
I forgot to look at the planetary gearboxes, I now wonder what gear ratio they are.
These Rexroth seem to be pricey motors. I have very little experience with the really cheap servo motors but my experience with other cheap industrial electronics has been that they are generally built lighter than their more expensive counterparts (not always). With the cheap stuff I try to oversize some to compensate. Considering that, I suggest 1000 watt cheap servos, but it's your call.
If you could provide me the weight (mass) of the gantry plus that of the equipment that will be attached to it, and also the friction of the gantry, I can estimate the speeds and accelerations you can expect from these motors.
I would suggest measuring the rolling friction with a scales, maybe something as simple as shoving the gantry about by pushing a... bathroom scale against it.
Tell me whether you are interested in my method of helping. I will now stop making noise here until I hear from you.
The X, X-slave, and Y axis each have a MSK050B-0600-NN-M1-UG0-NNNN which is a 600 watt motor.
The Z axis (torch lifter) has a MSM031C0300-NN-M5-MH1 which is a 300 watt motor.
I forgot to look at the planetary gearboxes, I now wonder what gear ratio they are.
These Rexroth seem to be pricey motors. I have very little experience with the really cheap servo motors but my experience with other cheap industrial electronics has been that they are generally built lighter than their more expensive counterparts (not always). With the cheap stuff I try to oversize some to compensate. Considering that, I suggest 1000 watt cheap servos, but it's your call.
If you could provide me the weight (mass) of the gantry plus that of the equipment that will be attached to it, and also the friction of the gantry, I can estimate the speeds and accelerations you can expect from these motors.
I would suggest measuring the rolling friction with a scales, maybe something as simple as shoving the gantry about by pushing a... bathroom scale against it.
Tell me whether you are interested in my method of helping. I will now stop making noise here until I hear from you.
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- rodw
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11 Dec 2025 06:12 #339973
by rodw
Replied by rodw on topic Looking for a freelancer to assist in drawing schematics for cnc plasma table
I had a look at the engineering required. Metric engineering by a US engineer associate so you will have to live with it.
As per the Work energy method, www.machinedesign.com/motors-drives/arti...rs-for-linear-motion
3 sec cut 1% Accelleration profile (eg. accelerate to cut speed in 30 milliseconds)
500lb gantry (227kg) 3000 rpm motor with 33.9:1 reduction per photos and a 60mm diameter pinion, gives you almost 18m/min rapids (about 700 in/min)
At a maximum design cut speed of 10240 mm/min (403 inch/min) Check your cut charts and advise.
Peak torque 38.8 Nm
Peak Power 342.6 Watts
Design Accelleration 5.68 mm/sec/sec (0.58 G's)
this indicates a 400W motor would suffice. Allowing 50% threshold, select a 600 W motor
Changing the gearbox to 18:1 would increase rapids to 32 m/min or 1260ipm
As per the Work energy method, www.machinedesign.com/motors-drives/arti...rs-for-linear-motion
3 sec cut 1% Accelleration profile (eg. accelerate to cut speed in 30 milliseconds)
500lb gantry (227kg) 3000 rpm motor with 33.9:1 reduction per photos and a 60mm diameter pinion, gives you almost 18m/min rapids (about 700 in/min)
At a maximum design cut speed of 10240 mm/min (403 inch/min) Check your cut charts and advise.
Peak torque 38.8 Nm
Peak Power 342.6 Watts
Design Accelleration 5.68 mm/sec/sec (0.58 G's)
this indicates a 400W motor would suffice. Allowing 50% threshold, select a 600 W motor
Changing the gearbox to 18:1 would increase rapids to 32 m/min or 1260ipm
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- tcbmetalworks
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23 Dec 2025 20:28 #340434
by tcbmetalworks
Replied by tcbmetalworks on topic Looking for a freelancer to assist in drawing schematics for cnc plasma table
Well I found somebody to help with this project and we were chugging away making good progress at it. I dident hear from him in a week or two and he messages me saying he was in a bad accident and just got released from the hospital. its been another week or two and I havent heard back from him. Really sucks hopefuly hes okay but we gotta move forward in the project. Is anyone here still interested in helping? im going to post all of the progress we made below its a google sheets aswell as a few pdfs
docs.google.com/spreadsheets/d/10GAzmrCI...184782#gid=730184782
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23 Dec 2025 20:40 #340436
by tcbmetalworks
Replied by tcbmetalworks on topic Looking for a freelancer to assist in drawing schematics for cnc plasma table
I included a photo below of the servo drives I already purchased. We have them mounted on the gantry already. here is a link to them. www.omc-stepperonline.com/a6-series-1000...-ip67-a6-rs1000h2a1-
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- NWE
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24 Dec 2025 03:16 - 24 Dec 2025 03:23 #340451
by NWE
Replied by NWE on topic Looking for a freelancer to assist in drawing schematics for cnc plasma table
Sorry to hear about the accident. That work you shared looks nice. Someone had it about all figured out. Wish I could help out. Dunno, my own wiring schematics are just scribbles on paper.
Last edit: 24 Dec 2025 03:23 by NWE.
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