Re: [Emc-developers] THC with 5 axis plasma

2016-09-21 Thread Marius Liebenberg
I agree. It is more al the signal level or HAL level or component level that I am wondering about. You cannot simply change the Z value as we do with THCUD. There are A and C axis involved now as well. -- Original Message -- From: "John Thornton" To: "Marius

Re: [Emc-developers] THC with 5 axis plasma

2016-09-21 Thread Andrew
You need to introduce virtual axis W for that purpose. There's this config... 5axiskins or smth. Andrew 2016-09-21 14:11 GMT+03:00 Marius Liebenberg : > I agree. It is more al the signal level or HAL level or component level > that I am wondering about. You cannot

Re: [Emc-developers] THC with 5 axis plasma

2016-09-21 Thread John Thornton
Cutting a bevel the thickness is different than the sheet but the arc distance is the same for the thickness being cut IMHO. JT On 09/21/2016 12:16 AM, Marius Liebenberg wrote: > Hi All > I am starting a build of a 5 axis plasma machine with bevelling > features. The problem I am facing is not

Re: [Emc-developers] THC with 5 axis plasma

2016-09-21 Thread Gene Heskett
On Wednesday 21 September 2016 07:11:21 Marius Liebenberg wrote: > I agree. It is more al the signal level or HAL level or component > level that I am wondering about. You cannot simply change the Z value > as we do with THCUD. There are A and C axis involved now as well. This is where I'd

Re: [Emc-developers] THC with 5 axis plasma

2016-09-21 Thread Lisandro Massera
5axiskins exports a pin pivot-length which is the tool length offset. You will have to be careful when conecting this pin to the THC because the THC can have big steps in its output which could cause following errors. Maybe you should connect the output to a filter and then the output of the

Re: [Emc-developers] THC with 5 axis plasma

2016-09-21 Thread Marius Liebenberg
The THC component can run in the servo loop and I can limit the rate that it changes by. I have a rate setting on the plasma screen for that purpose. Let me see if I understand it then. I will measure the arc voltage and if it is out of spec I will tweak pivot-length at a low rate to adjust the

Re: [Emc-developers] THC with 5 axis plasma

2016-09-21 Thread Marius Liebenberg
That sounds interesting. Can one change the pivot length during a move? -- Original Message -- From: "Lisandro Massera" To: "EMC developers" Sent: 2016-09-21 13:52:33 Subject: Re: [Emc-developers] THC with 5 axis

Re: [Emc-developers] THC with 5 axis plasma

2016-09-21 Thread TJoseph Powderly
Hello, when the plasma is at an angle to work, it is more difficult for the control to 'see' the height ( one side of the surface is often gone ). Similar to drilling a sphere, its easy when the drill path is a radius to center, but difficult when off center, very difficult as you approach the

Re: [Emc-developers] THC with 5 axis plasma

2016-09-21 Thread John Thornton
Z is still the only axis that controls the torch height. A and C should be programmed to follow the path needed for the part. Just trying to visualize that machine in my head... is A and C rotating Z or the part? JT On 09/21/2016 06:11 AM, Marius Liebenberg wrote: >I agree. It is more al

Re: [Emc-developers] THC with 5 axis plasma

2016-09-21 Thread Lisandro Massera
Pivot-length is a hal pin which modifies the kinematics calculations which are made at servo rate. You can change it's value as often as that. As long as the changes are smooth enough to not to generate following errors, you should be OK. One way I imagine to do that is using M67 and

Re: [Emc-developers] THC with 5 axis plasma

2016-09-21 Thread Marius Liebenberg
John The A rotates the head around the X axis and the A rotates the head around the Z axis. If the torch is sitting at 45 deg and you pull up the Z axis it will cut on another line. True the flame is further away but also not on the same cut line any more -- Original Message -- From: