Retrofitting a 1987 maho mh600c
- Mccartymachine1
- Offline
- Senior Member
-
- Posts: 42
- Thank you received: 2
Please Log in or Create an account to join the conversation.
JT
Please Log in or Create an account to join the conversation.
Just create two configurations, one for vertical and one for horizontal if the hardware is different.
This is the approach I take with my Universal milling machine.
As CAM-created G-code always has the Z axis parallel with the spindle, but the horizontal spindle is parallel with what is normally the Y axis I have two different configs (Two INI files in the same folder) so that the configs share tool table and several HAL files, but in one config the XYZ axes are switched about.
I actually have three configs, one is set up as a dedicated gear hobber.
Please Log in or Create an account to join the conversation.
- Mccartymachine1
- Offline
- Senior Member
-
- Posts: 42
- Thank you received: 2
The next question I have is about linear scales. I have purchased two of the three scales already and I hope I haven't made a mistake. I got Chinese 1um sino brand ka300 scales. Would 5um have been ok? Will the 1um scales limit my rapid moves? Any chance these scales will last? I have the x scale wired in but not mounted yet. It seems to read ok but I can move it fast by hand and it looses position (might be my mesa card settings). I will be starting to tune the servo once I have it mounted.
Please Log in or Create an account to join the conversation.
The next question I have is about linear scales. I have purchased two of the three scales already and I hope I haven't made a mistake. I got Chinese 1um sino brand ka300 scales. Would 5um have been ok? Will the 1um scales limit my rapid moves? .
What are you counting with? What rapid speed do you require? What is the data output format?
The 7I77 uses multiplexed encoder signals to save interface pins. The multiplexing
rate will determine the maximum encoder count rate. Default multiplexing rate with
HostMot2 firmware is ClockLow / 8,or approximately 4 MHz with 5I25 or 6I25 FPGA host
interface cards, giving a resolvable count rate of 2 MHz. The Multiplexing rate can be
increased if desired but high multiplex rates will require short cables between the FPGA
controller card and the 7I77 due to signal integrity and time-of-flight considerations.
Maximum practical multiplex rate is approximately 12 MHz (and 6 MHz count rates)
So, 2MHz count rate and 1um resolution means a max speed of 2m/S. That's fairly fast, I would have thought faster than your Maho.
Please Log in or Create an account to join the conversation.
- Mccartymachine1
- Offline
- Senior Member
-
- Posts: 42
- Thank you received: 2
Please Log in or Create an account to join the conversation.
- Mccartymachine1
- Offline
- Senior Member
-
- Posts: 42
- Thank you received: 2
Please Log in or Create an account to join the conversation.
I am getting a bit overwhelmed while starting to read about PID tuning. Is there a simple step by step one could point me to?
Try: gnipsel.com/linuxcnc/tuning/index.html
Please Log in or Create an account to join the conversation.
- Mccartymachine1
- Offline
- Senior Member
-
- Posts: 42
- Thank you received: 2
Please Log in or Create an account to join the conversation.
Thank you. That one looks fairly straightforward and easy. The only thing I'm unsure of is the line about setting the velocity in machine units per second. I am using inches and it is a velocity drive.
Then machine units are inches and units per second is units per minute / 60.
(Just in case you thought it was in some way more complicated than it appears)
Please Log in or Create an account to join the conversation.