Something wrong

This is the place to talk about and share things related to CNC plasma machines using UCCNC

Re: Something wrong

Postby Robertspark » Fri Oct 07, 2016 3:37 pm

Andrew,

Yo don't need the Q255.... (if you want it on 100%)
M10 without the parameter will provide 100% PWM duty cycle.
Rob
Einstein ― “If you can't explain it to a six year old, you don't understand it yourself”
...working my way through the 1000+ ways things don't work to find the one that does
UC400eth, UC300eth, UCCNC v1.2106, Neuron Lite
UCCNC v1.2105 Macro Manual
Robertspark
 
Posts: 898
Joined: Sat Sep 03, 2016 4:27 pm
Location: Nr Liverpool, England

Re: Something wrong

Postby Robertspark » Fri Oct 07, 2016 4:27 pm

I should have added to that, it's documented in the uccnc uses manual under the mcodes section
Rob
Einstein ― “If you can't explain it to a six year old, you don't understand it yourself”
...working my way through the 1000+ ways things don't work to find the one that does
UC400eth, UC300eth, UCCNC v1.2106, Neuron Lite
UCCNC v1.2105 Macro Manual
Robertspark
 
Posts: 898
Joined: Sat Sep 03, 2016 4:27 pm
Location: Nr Liverpool, England

Re: Something wrong

Postby shad » Fri Oct 07, 2016 6:04 pm

Thank you Rob! I will test it tomorrow. :)
And if will have success will start testing plugin for THC.
-- Andrew
UC400ETH
UC300ETH-5LPT
NEURON Lite THC
http://neuroncnc.com/
shad
 
Posts: 268
Joined: Thu Sep 15, 2016 5:23 pm

Re: Something wrong

Postby beefy » Sat Oct 08, 2016 12:05 am

Andrew,

Let's think of 2 different situations - starting a cut with THC off, and starting a cut with THC on.

THC OFF
M3 is issued then XY moves are issued. No harm will come if the torch didn't fire or there was a delay before the torch was "lit". When I say "no harm" I'm more talking about the torch won't raise or dive.

THC ON
M3 is issued. Now imagine if THC control happened immediately without waiting for Arc OK. The THC want to keep the arc volts the same as Set Volts but before the arc is established the volts are much lower. Therefor the THC will raise the Z in an attempt to get the torch volts to increase to the Set Volts level. It does take a certain amount of time for the M3 signal to get to the plasma cutter (via relay, etc), then for the plasma cutter to establish the arc and give Arc OK. In that short time the Z axis would have been raising. Worse still if there was a misfire the torch will just keep raising.

So I THINK that is the basis for waiting for Arc OK when THC is enabled.

Keith.
beefy
 
Posts: 191
Joined: Mon Sep 05, 2016 10:34 am

Re: Something wrong

Postby shad » Sat Oct 08, 2016 5:45 am

Keith, you're right, but let's look at this from the other side.
Yes, THC ON/OFF this is "wait for ArcOK" future. It's mean CNC hold XY moves while ArcOK signal from cutter or THC controller is not present. Without main arc no sense to start XY moves. Cut would be incomplete if the arc occurs later - delay between start signal and main arc issue any time up to 5 seconds (depend from cutter). Sometimes you need time for pierce. And of course it's will decrease the lifetime of consumables. Also you have to return torch on the M3 position and restart. It's all take time.

Second basic future - Turn on/off AVC (automatic voltage control) from THC inputs (for example Torch up/down) - just torch freeze when AVC off. So, we need to have ability to control this future from gcode and/or from UCCNC antidive future. I like this future, because it's solve 80% of all problem during cutting.
-- Andrew
UC400ETH
UC300ETH-5LPT
NEURON Lite THC
http://neuroncnc.com/
shad
 
Posts: 268
Joined: Thu Sep 15, 2016 5:23 pm

Re: Something wrong

Postby Robertspark » Sat Oct 08, 2016 6:39 am

Andrew, I was having a look at the neuron lite thc manual yesterday, how do you turn the torch on and off, as it looked like you only have one hard wired input from the cnc controller software which is the thc lock function

Is torch on and off via software plugin? (Ethernet connection)
Rob
Einstein ― “If you can't explain it to a six year old, you don't understand it yourself”
...working my way through the 1000+ ways things don't work to find the one that does
UC400eth, UC300eth, UCCNC v1.2106, Neuron Lite
UCCNC v1.2105 Macro Manual
Robertspark
 
Posts: 898
Joined: Sat Sep 03, 2016 4:27 pm
Location: Nr Liverpool, England

Re: Something wrong

Postby shad » Sun Oct 09, 2016 8:16 am

Yes Rob. For torch on/off signal is used software (Ethernet) way. This signal starts the initial height sensing procedure and then main cutting sequence.
-- Andrew
UC400ETH
UC300ETH-5LPT
NEURON Lite THC
http://neuroncnc.com/
shad
 
Posts: 268
Joined: Thu Sep 15, 2016 5:23 pm

Previous

Return to CNC Plasma

Who is online

Users browsing this forum: No registered users and 1 guest