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  • JAM
  • JAM
10 Dec 2024 06:02 - 10 Dec 2024 06:06

Raspberry Pi 5 with 7c81 WORKING!

Category: Driver Boards

Thanks to the wonderful efforts of everyone recently, I have been able to get my 7c81 working excellently with my Raspberry Pi 5 on the 2.10.0~pre0 (self built) version using the `hm2_spix` driver.

I have a lot of configuration and testing to do, but thus far it seems to be working flawlessly. 

I did have a few things to get it working the way I wanted, one was getting remote access and spi working for flashing:
/boot/broadcom/config.txt

...
dtparam=spi=on
...
dtoverlay=vc4-kms-v3d-pi5


I also had to replace the hm2 module load with the spix version in the `foo.hal` file.


loadrt hm2_spix config="firmware=hm2/7c81/G540X2.BIT num_encoders=0 num_pwmgens=0 num_stepgens=4"


Ignore the mess of wires, I need to get some mounting stuff figured out, plus all of the plasma cutting controls and so on figured out next too.
  • timo
  • timo
10 Dec 2024 04:49
Replied by timo on topic Ein Neuling sucht Hilfe

Ein Neuling sucht Hilfe

Category: Deutsch

Hallo,

schön, dass du die Frustrationsschwelle "verschoben hast" :-)
Ich vestehe nicht ganz, was du verändern möchtest. X-geht ja "eigenlich" immer von "links" nach "rechts" und y immer "vorne-hinten".
Soll die Beschriftung am Bildschirm getauscht werden?
Die Zuordnung der Antriebe könnte man ja einfach durch umstöpseln der Motoren erledigen, oder in der *.hal die zugehörigen Mesa-Ausgänge vertauschen.

Gruß Timo
  • D Jensen
  • D Jensen
10 Dec 2024 04:13
Replied by D Jensen on topic Retrofitting a MAHO MH600T

Retrofitting a MAHO MH600T

Category: Milling Machines

I wish I had found Marks saga before I finished my Maho MHC700 restoration. Not an obvious place to start looking for a Heidenhain controlled machine. My machine has a TNC 155 retrofitted and you probably have read about it's rebuild on Marks thread. Your TNC 355 is very similar. It just has a bit more memory and speed. So it has a few more machine parameters tacked in the end of the TNC 155 list and probably runs a bit faster.
The one really lucky break I got was the Heidenhain worked perfectly first time. All I had to do was load in the machine parameters and swap it to English. Fortunately I had them on paper tape and hand written in the manual.
But that situation didn't last. Recently it started to get some fold back at the top of the BE411 monitor. Not the end of the world, but I couldn't read the line number in graphics mode, making testing programs a bit difficult. The problem is almost always the electrolytic capacitors so I read up on how to not kill myself changing them. Disconcerting things like putting one hand in your pocket whilst shorting the 22000 volts on the plug on the display tube with the other, so you don't draw the voltage across your heart if you mess up.
There are about 25 of them if you do all of them like I did, and there a few difficulties and traps to know if you want to try it on yours, but it came up perfect. Crisp and clean without doing any adjustments. About $60 Australian from Farnell in the UK. 3 days deliver to Australia. And the capacitors are smaller, have up to 5 times the life even at a much higher temperature rating.
In hindsight it might have been easier to do that on yours to debug the circuits then go to LinuxCNC.
The problem with the Heidenhain is you have a TI processor of about the same era an IBM PC AT with an Intel 80286. 16 bit and about 8MHz. And you are limited to simple pocketing and pecking.
With your setup you have the advantage of updating you PC forever and a wealth of open source programs. To get to the next step I'm going to have to get familiar with Fusion 360 and drip feed. Heidenhain has a nice serial coms program that works for all the machine they ever made Fusion 360 has a post processor file that works for my machine. I've been doing my modelling in SolidWorks for the last 30 years so it's not that big a step.

BTW. On mine, once the 220 volt power is latched on by 19K1, it goes through the 3Q1 circuit breaker, then to the  3F1 pressure switch on the hydraulic pump, then back the the hydraulic pump contactor coil 3K1 and runs the pump. The pump run is very brief as there in no hydraulic accumulator on my machine. It runs a lot longer to release both chucks or the CNC rotary table. The Vogel lubricator also runs straight from 3Q1 also and is actually powered by the 220 volts. So it does a lube cycle every startup, then goes to timer based lubrication cycles. So a dumb system not controlled by the CNC controller.

Cheers,
David
  • sawdust
  • sawdust
10 Dec 2024 04:03
Replied by sawdust on topic dm542t motor reversal?

dm542t motor reversal?

Category: General LinuxCNC Questions

Instant fix. Tommy, thank you. I have been slamming my head against that for days.
  • fully_defined
  • fully_defined's Avatar
10 Dec 2024 03:55
Replied by fully_defined on topic Rotary Selector Switches & Resistors

Rotary Selector Switches & Resistors

Category: General LinuxCNC Questions

I appreciate your response, but I am not sure we are talking about the same thing.

Can you elaborate on how a potentiometer would work as a switch?
  • sawdust
  • sawdust
10 Dec 2024 03:53
Replied by sawdust on topic dm542t motor reversal?

dm542t motor reversal?

Category: General LinuxCNC Questions

So appreciated! I will go take a crack at that right now.
I disconnect ALL the power! always.

dc
  • tommylight
  • tommylight's Avatar
10 Dec 2024 03:48
Replied by tommylight on topic Rotary Selector Switches & Resistors

Rotary Selector Switches & Resistors

Category: General LinuxCNC Questions

Do you already have the switches?
If not, use potentiometers, cheaper, easier to wire, and linear regulation/range/etc
  • tommylight
  • tommylight's Avatar
10 Dec 2024 03:44 - 10 Dec 2024 03:45
Replied by tommylight on topic dm542t motor reversal?

dm542t motor reversal?

Category: General LinuxCNC Questions

I tried reversing the motor phase connections on one driver/motor and the motors still both spun the same direction.

One winding ONLY, not both, and not phases.
Single phase, one winding, two wires, that is the only thing you need to change for it to change direction.
Edit:
NEVER while the drive is powered!!!
  • cmorley
  • cmorley
10 Dec 2024 03:40
Replied by cmorley on topic qtvismach, a axis toolpath

qtvismach, a axis toolpath

Category: Qtvcp

Is it a subtle difference? I don't see a difference in zooming with your changes.
It certainly didn't hurt anything ti have it in.
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