Hi Greg great and informative video, I am currently building one table for myself (Masso +Proma opto THC) and 1 for a mate MyPlasm, The MyPlasm has an Ohmic input but needs to be connected to an isolated sensing tip (ie: Hypertherm) . The Masso requires the same setup. Just wondering how your setup connects. PS: PC 3099.....
Hi Greg, I'm in Melbourne and I also have a lotus ltp200 HF I also built my own CNC which I used for wood only until recently when I converted it to Plasma Big problem I found was too much EMF from the Lotus caused trouble with the CNC controller and Laptop so I switched to a Low Freq Cutter. (Cut50 LF) i also had to isolate the cutting water tray from he chassis of the CNC and I ground them both to the steel posts of my shed in order to get the EMF down Im still trying to fine tune the whole things and get a nice cut Ive subscribed to your channel - hoping to learn more from you :-)
When I first built my table I had a problem with EMF. That was with a USB connected controller. Ditched that for Ethernet connected controller. Not saying there Ethernet is the silver bullet but would never go back to USB. Never had issues with EMF on any of my CNC machines. No special grounding or shielded cables. Just never had an issue. I am in PC 3178
@@GreoltThanks for the advice. I will look into the Ethernet approach I'm in PC 3059 looking forward to your next installment. Very interested to see how you have reduced the dross. Looking at your video , the cuts seem very clean.
Very informative video. Can you please show how you connect the ohmic cable to the torch ? The “Copper-head” torches has the cable attached to the outside of the copper head, But this torch has a ceramic outer shell, so where do you connect the wire ?
Thanks so much for the great video!! I too am working with UCCNC and Ohmic sensor that you have. I would love to have both Z sensors like you but have no idea how to go about setting up a macro and how to make it work? Would you please share your macro and give some information on how to get it working? Thanks again! Werner
most cnc controller s have a tool touch off function its a basic continuity check might be able to do this ...but problem I see is the part has to be earthed and it's advised you have the plasma process isolated during cutting so I guess ground it through a relay momentarily I guess
So far it has been reliable. And yes the floating head switch is still operational. I do usually make sure my material is clean and free from rust, paint etc So far water splashed onto the material has not been an issue. Time will tell. The sensitivity adjustment has a very wide range and may need fine tuning if that happens often. If I was only cutting the heavier material that I have seen you cut so far, then I would be content with the floating head.
That's awesome. I built a very similar CNC plasma table using a generic, Chinese 50 amp machine and an AG60 torch. It's surprising how few people are building CNC tables for these Chinese machines, considering how affordable they've become. The only issue I've had with these cheap AG60 torches is angularity in the cuts. I'm assuming it's caused by a slight mis-alignment of the electrode and nozzle, due to poor machining.
There's no doubt these torches are not up to the standard of something like Hypertherm. However they cost about as much as one full set of Hypertherm consumables. And the cnc torch costs twice as much as my whole plasma cutter. Fine if you are in business. But I am a hobby user. I have found that careful setting of air pressure, cut height, and a new nozzle makes most of the angularity go away.
@@Greolt Yeah, I think these Chinese machines are definitely the most cost-effective for hobby users like us. Most of my projects are cut from 1/4 inch material or thinner, so a slightly beveled cut usually isn't a big deal.
very helpful, thank you for the time you have put into this. Bye Duncan
Hi Greg great and informative video, I am currently building one table for myself (Masso +Proma opto THC) and 1 for a mate MyPlasm, The MyPlasm has an Ohmic input but needs to be connected to an isolated sensing tip (ie: Hypertherm) . The Masso requires the same setup. Just wondering how your setup connects. PS: PC 3099.....
Hello, can I also use the robot3t Ohmic sensor with plasma cutters that have a pilot spark?
Hi Greg, I'm in Melbourne and I also have a lotus ltp200 HF
I also built my own CNC which I used for wood only until recently when I converted it to Plasma
Big problem I found was too much EMF from the Lotus caused trouble with the CNC controller and Laptop so I switched to a Low Freq Cutter. (Cut50 LF)
i also had to isolate the cutting water tray from he chassis of the CNC and I ground them both to the steel posts of my shed in order to get the EMF down
Im still trying to fine tune the whole things and get a nice cut
Ive subscribed to your channel - hoping to learn more from you :-)
When I first built my table I had a problem with EMF. That was with a USB connected controller. Ditched that for Ethernet connected controller.
Not saying there Ethernet is the silver bullet but would never go back to USB.
Never had issues with EMF on any of my CNC machines. No special grounding or shielded cables. Just never had an issue.
I am in PC 3178
@@GreoltThanks for the advice. I will look into the Ethernet approach
I'm in PC 3059
looking forward to your next installment. Very interested to see how you have reduced the dross.
Looking at your video , the cuts seem very clean.
Very good video sir ... can you share the wiring for the ohmic sensor how to wire it ?
Very informative video.
Can you please show how you connect the ohmic cable to the torch ?
The “Copper-head” torches has the cable attached to the outside of the copper head,
But this torch has a ceramic outer shell, so where do you connect the wire ?
See Adam Naylor's question and reply about that.
Thanks so much for the great video!! I too am working with UCCNC and Ohmic sensor that you have. I would love to have both Z sensors like you but have no idea how to go about setting up a macro and how to make it work? Would you please share your macro and give some information on how to get it working? Thanks again! Werner
Check your email for contact
most cnc controller s have a tool touch off function its a basic continuity check might be able to do this ...but problem I see is the part has to be earthed and it's advised you have the plasma process isolated during cutting so I guess ground it through a relay momentarily I guess
Yes a series of relays connects the ohmic sensor to the nozzle and then isolates it from the pilot arc after sensing.
Does the Ohmic sensor fail at times? And your system uses the back up touch off sensor?
So far it has been reliable. And yes the floating head switch is still operational.
I do usually make sure my material is clean and free from rust, paint etc
So far water splashed onto the material has not been an issue. Time will tell.
The sensitivity adjustment has a very wide range and may need fine tuning if that happens often.
If I was only cutting the heavier material that I have seen you cut so far, then I would be content with the floating head.
after probing will ohmic make the torch maintain its height? please explain, is the ohmic sensor a THC or just like a proximity switch?
Just similar to a proximity switch really. Not THC.
@@Greolt nice info, thanks
What torch is this? I want change mi ipt60 torch for ohmic sensor
Search google for "ag60 straight torch"
However your torch is a blow back style. This one is pilot arc style.
That's awesome. I built a very similar CNC plasma table using a generic, Chinese 50 amp machine and an AG60 torch. It's surprising how few people are building CNC tables for these Chinese machines, considering how affordable they've become.
The only issue I've had with these cheap AG60 torches is angularity in the cuts. I'm assuming it's caused by a slight mis-alignment of the electrode and nozzle, due to poor machining.
There's no doubt these torches are not up to the standard of something like Hypertherm. However they cost about as much as one full set of Hypertherm consumables.
And the cnc torch costs twice as much as my whole plasma cutter. Fine if you are in business. But I am a hobby user.
I have found that careful setting of air pressure, cut height, and a new nozzle makes most of the angularity go away.
@@Greolt Yeah, I think these Chinese machines are definitely the most cost-effective for hobby users like us. Most of my projects are cut from 1/4 inch material or thinner, so a slightly beveled cut usually isn't a big deal.
Good tutorial video What is the name and web site for the THC and Ohmic sensor from VN
Thanks
robot3t.com
@@Greolt Thanks for the info have fun
Tom
Hi Greg, I’m from Geelong Victoria and wanting to make my own cnc plasma, any chance I can contact you directly to pick ur brains on the topic?
Is there a way for you to send me an email address without it being made public?
Ayuda con la conexion ...compre un sensor igual y tengo la misma ant
Orcha .....un diagrama como conectar por favor
so what is a ohmic sensor??
Search "ohmic sensor plasma"
It is just a switch based on then the torch head touching the metal.
Lol; "zed"...
That is how we say the letter Z. I try to remember to say zee like Americans do but sometimes forget. LOL
I learned Zed in my country and when I came to US was forced to learn zee and I hated that.
@@rsz90182 Zed is dead...