Advanced Search

Slowly all components are coming in to be able to build the control cabinet.
For the drive I have ordered pulleys of 12 teeth to do a test with direct drive.
If this does not work well I will switch to a transmission.

 

Yes, the THCAD2 replaces both the THCAD5 and THCAD10

And yes, you can use the 2 spare encoders for THCADs.

(if you needed more encoders, firmware that puts 2 or 3
'A' only encoders on one 7I97T 8 pin encoder connector
is possible)

Thank you

I will refer to hypertherms controller manual on the drive enables.

It looks like the thcad2 has replaced the thcad5 and thcad10? Its been a few years since I've messed with this stuff. My 7i96s table just works with zero maintenance.

Since there are 6 encoder interfaces on a 7i97t can I use the 2 left over for thc and ohmic?

¿El THCAD2 está en la misma caja que el 7I96S?

perdon entendi mal no el thc esta en la maquina de plasma 

El thcad2 no lo se por que no se como comprobarlo

he comprobado lo de step/dir 04 y funciona perfectamente 

The THCAD connection should not have any effect on the 7I96S unless there was
some kind of issue with the 7I96S side (encoder side) wiring, as the plasma
(Analog input) side of the THCAD is completely isolated from the 7I96S.

Is the THCAD2 in the same case as the 7I96S?
 
 

My bad, aluminium is about 1.2 kg for 1200mm
So it is about 2.5 times as heavy but many times stronger against deflection.
That is why the choice was made for the 80x40 extrusion profile.

The guides weigh a lot more there, more could be gained there.

He comprobado por si había cortocircuito y no encontré ningunoLa tierra la tengo conectada de todos los cables blindados en una sola punta dentro de la caja de control en una barra de tierra que a su vez esta conectada a la tierra de la redEl problema fue cuando conectar el thcad2 antes de conectarlo, estuve cortando y todo funcionaba bien también es verdad que lo conecta y no lo configuré en linuxcnc por el hecho, que no encontráis la pantalla de thcad2 en pncconf y no se como configurarlo en .hal y solamente le di hacer una prueba arrancando la antorcha y ya los motores no se movían al instante.

ya pedí los chips pero me gustaría encontrar lo que a producido el fallo antes de que me pase lo mismo. Podrías ayudarme. Gracias de nuevo

For axample:
Aluminium extrusion profile L=1200mm (2.9 kg) vs aluminium 50x50x2 tube L=1200mm (3.6kg)

I must say that the weight comparison seems very counter intuitive.

[edit]

you are comparing aluminium extrusion profile to  50x50x2 steel tubing (8000kg/m3).

Thanks, well spotted! I was hoping that 1/3200 microstepping would work.
Perhaps I will have to do a 1/3 reduction later. For now I think I'll try how this works.

The goal is to get linuxcnc up and running first and try to configure everything properly



The point of the 80x40 extrusion profile I certainly do not agree with as a mechanical engineer.
The 80/40 extrusion profile has a much higher stiffness compared to a normal tube. Especially compared to an aluminum tube.

For axample:
Aluminium extrusion profile L=1200mm (2.9 kg) vs aluminium 50x50x2 tube L=1200mm (3.6kg)

Comparison of Bending Resistance
ProfileDirection (axis)                                        Section Modulus (W) 

80x40 extrusion
Major axis (80 mm high) → bending about        X = 8,898,884 mm³ 
Minor axis (40 mm high) → bending about        Y = 120,303 mm³

50x50x2 mm box
Any axis (symmetric) → c = 25 mm                    X and Y = 5,912 mm³

Key Differences:

In the x-axis, the 80x40 profile has ~1500× higher section modulus (1500x stronger!) and is 20% less heavy than the 50x50x2 box.

In the y-axis, it still has ~20× higher section modulus (20x stronger!).

In the meantime, I’ve slowly started building the prototype.
I’ve decided to go with LinuxCNC in combination with the Mesa 7i96s and the THCAD-2.
All parts were initially 3D printed in ASA-CF.
In practice, it will have to be determined whether this material is strong and rigid enough.
If not, the parts will be replaced. For now, I want to test the concept first.
The axes are driven by 3Nm Nema 23 stepper motors and an HTD-5M timing belt with a 15-tooth pulley, without any gear reduction.
The frame will be made of stainless steel square tubing, 50x50x3 mm.

I’ve just started working on that.

Any tips or feedback are very welcome! I'm here to learn  

Yes, I overlooked the /usr/bin/pncconf in my search. The problem was that the pin number for the 7i95t first encoder port was 0 which caused "if self.d._arcvin ..." to evaluate to false. I fixed it by using "if self.d._arcvin != None ...".

This is the only place I noticed it set true:

                # for encoder pins
                elif widgetptype == _PD.ENCA:
                    #print"\nptype encoder"
                    halsignallist = 'hal_encoder_input_names'
                    humansignallist = _PD.human_encoder_input_names
                    addsignalto = self.d.halencoderinputsignames
                    relatedsearch = [_PD.ENCA,_PD.ENCB,_PD.ENCI,_PD.ENCM]
                    relatedending = ["-a","-b","-i","-m"]
                    customindex = len(humansignallist)-1
                    # check for a thcad encoder
                    if "Arc Voltage" in pinchanged:
                        self.d._arcvpin = pin
                    elif self.d._arcvpin == pin:
                        self.d._arcvpin = None
                    if self.d._arcvpin and self.d.frontend == _PD._QTPLASMAC:
                        self.p.page_set_state('thcad', True)
                    else:
                        self.p.page_set_state('thcad', False)

 

You can just replace the private_data.py file in /usr/lib/python3/dist-packages/pncconf with the private_data.py that is attached to my post. I would backup the original file first just in case.

Well MesaCT doesn't support QTPlasmaC at the moment. I have done some work on supporting it but haven't heard from JT if he's interested in bringing those changes in if I make a pull request.

Nice effort! How would one apply the changes to get 7i95t support in pncconf?

What are pros/cons of using pncconf vs mesa CT? github.com/jethornton/mesact