So far so good. That is the old one with just two sensors. check out my later one that uses 6 sensors in a circle. It eliminates the risk of the sensors being over a gap. The only issues I have had, are with the 4 channel relay boards. I have had some that the relays stick. Cheap Chinese boards. They are cheap though, so I just replaced it.
Wow, what an interesting way of doing a THC!! f= 1 /(2πRC) for an RC Phase Shifter at 90°, therefore Resistor (R): 1 kΩ Capacitor (C): 1 μF. Resistor would need to handle the current of the stepper motor as it runs. This would be a more precise circuit for the 90 degree phase shift the stepper windings need. Also the cap needs to be non polarizing if you are passing AC through it. The resistor should also help to ensure the stepper windings current is not exceeded. An addition to this is to add a current sensor by way of a CT on the ground wire. When the current is low i.e. about 0, then do not run the THC motor and only run when the current is high, i.e. the torch is in cut mode.
@@bh9420 I handled only running the THC when the torch is cutting by using a double pole relay. The 12 VDC spindle output from the control board takes one relay out to send the trigger signal to the plasma cutter, and the other to turn on the AC to the stepper circuit. I have a toggle switch that parallels that output if I want to run it all the time....
As long as the metal is within the two set points(high and low), the z height motor is off. The low sensor kills power to the down direction and the sensor is active. When the metal goes high enough to trip the second sensor reversing the direction, and over-rides the motor power shunt. When it goes high enough to trip the high sensor off, it stops again as long as the low sensor is still active. The trick is to get the difference between high and low just right, about 1-1 1/2mm. The real improvement was adding sensors all the way around the torch.
So my neighbor watched it three time and said he still didn't understand what I was saying...... I guess I need more humor, or blow stuff up to get more viewership..... I guess I'm more of a nerd than I thought!......
@frantasticdesigns I have sent two requests now, just open the document for public access, if it is public domain!! That way no one needs to request access. TY!!
Such a simple and cheap way to create a thc. Never would’ve thought about it this way. How have the prox sensors held up with the cutting ?
So far so good. That is the old one with just two sensors. check out my later one that uses 6 sensors in a circle. It eliminates the risk of the sensors being over a gap. The only issues I have had, are with the 4 channel relay boards. I have had some that the relays stick. Cheap Chinese boards. They are cheap though, so I just replaced it.
Wow, what an interesting way of doing a THC!! f= 1 /(2πRC) for an RC Phase Shifter at 90°, therefore Resistor (R): 1 kΩ Capacitor (C): 1 μF. Resistor would need to handle the current of the stepper motor as it runs. This would be a more precise circuit for the 90 degree phase shift the stepper windings need. Also the cap needs to be non polarizing if you are passing AC through it. The resistor should also help to ensure the stepper windings current is not exceeded. An addition to this is to add a current sensor by way of a CT on the ground wire. When the current is low i.e. about 0, then do not run the THC motor and only run when the current is high, i.e. the torch is in cut mode.
@@bh9420 I handled only running the THC when the torch is cutting by using a double pole relay. The 12 VDC spindle output from the control board takes one relay out to send the trigger signal to the plasma cutter, and the other to turn on the AC to the stepper circuit. I have a toggle switch that parallels that output if I want to run it all the time....
Very interesting and functional. congratulations. I asked for access to Google Drive, please. excuse the google translation. I'm in Brazil.
Sorry, just saw this, try accessing the diagram now, I changed the sharing permissions
So it seems like you will always have up and down movement with that versus how most work by sensing the voltage at the arc and using a PID loop.
As long as the metal is within the two set points(high and low), the z height motor is off. The low sensor kills power to the down direction and the sensor is active. When the metal goes high enough to trip the second sensor reversing the direction, and over-rides the motor power shunt. When it goes high enough to trip the high sensor off, it stops again as long as the low sensor is still active. The trick is to get the difference between high and low just right, about 1-1 1/2mm. The real improvement was adding sensors all the way around the torch.
Hell yeah, but only 9 likes for this video??
So my neighbor watched it three time and said he still didn't understand what I was saying...... I guess I need more humor, or blow stuff up to get more viewership..... I guess I'm more of a nerd than I thought!......
Hey can you accept my google drive request, also do you have the 3d printer stl files for the torch holder and prox sensor holders?
@@bh9420 I did not see a google drive request. I will see if I can get the files online shortly
@frantasticdesigns I have sent two requests now, just open the document for public access, if it is public domain!! That way no one needs to request access. TY!!
@@frantasticdesigns
But it continues to deny access.