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China cutting plasma cnc machine issues

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tiago cordeiro
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Joined: Tue Jun 13, 2017 8:34 am

China cutting plasma cnc machine issues

Post by tiago cordeiro » Tue Jun 13, 2017 8:46 am

Hello I bought a cnc plasma cutting table in china, and I am having some problems in cutting quality. And their assistance is weak.
My biggest problem, I think it is not being able to keep the arc stable. I am new to this subject.
My cut is conical. In attachment I leave a link with my equipment, I hope some help me.
https://www.youtube.com/watch?v=-hhglS5FKs4&t=153s.
my thc is:
https://www.google.pt/search?q=thc+micr ... n6fngV1S-M:
my plasma is: lgk 200
https://www.google.pt/search?q=thc+micr ... n6fngV1S-M:

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acourtjester
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Re: cutting plasma cnc

Post by acourtjester » Tue Jun 13, 2017 10:41 am

Many things come into play, thickness of the metal and using the correct amps, nozzle size, air pressure, cutting height, and cutting speed.
Your THC has a sensitivity adjustment if it is set to low it may not react to waves in the metal, and to high the torch will rapidly move up/down when cutting.
You should make many straight test cuts about 8" long and very the setting to find what give you the best cutting conditions.
When you say conical cuts are you saying it has a taper shape, either bigger at the top or bottom?
DIY 4X4 Plasma/Router Table
CandCNC DTHC-IV & Feather Touch
Hypertherm PM65 Machine Torch
Drag Knife and Scribe
Miller Mig welder
13" metal lathe
Small Mill
Everlast PM 256 tig

tiago cordeiro
Posts: 4
Joined: Tue Jun 13, 2017 8:34 am

Re: cutting plasma cnc

Post by tiago cordeiro » Tue Jun 13, 2017 11:44 am

My problem is in keeping the bow steady throughout the cut. My torch walks up and down.
I have performed tests on a 10 mm plate, with air pressure of 06 mpa, speed between 500 and 1000 mm / min, amps between 100 and 130, set between 120 and 140, I am using a nozzle of 2.2 mm
The problem and that the arc never reaches the set arc.

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acourtjester
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Re: cutting plasma cnc

Post by acourtjester » Tue Jun 13, 2017 5:41 pm

For that thickness why are you using 100 to 130 amps. you should be able to cut it with about 65 amps at 1000mm/min.
DIY 4X4 Plasma/Router Table
CandCNC DTHC-IV & Feather Touch
Hypertherm PM65 Machine Torch
Drag Knife and Scribe
Miller Mig welder
13" metal lathe
Small Mill
Everlast PM 256 tig

tiago cordeiro
Posts: 4
Joined: Tue Jun 13, 2017 8:34 am

Re: cutting plasma cnc

Post by tiago cordeiro » Wed Jun 14, 2017 12:22 pm

What would be the ideal air pressure for these amps?
. At the starting point I'm using 5 mm, and a delay of 1.5 seconds. Will be little delay
What would be the ideal arc set for this cut? 100?

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acourtjester
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Location: Pensacola, Fla

Re: cutting plasma cnc

Post by acourtjester » Wed Jun 14, 2017 1:53 pm

by doing the test I talked about above you will find out what is the voltage for your system.
I have a Hypertherm and use the book setting I have no idea what your plasma from China should be.
Keep a log of your finding and repeat for different thickness of metal, it may take a little time but you will be able to have the setting for later use.
DIY 4X4 Plasma/Router Table
CandCNC DTHC-IV & Feather Touch
Hypertherm PM65 Machine Torch
Drag Knife and Scribe
Miller Mig welder
13" metal lathe
Small Mill
Everlast PM 256 tig

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