Hurco KMB-IS CNC update

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27 Sep 2020 20:37 #184034 by tommylight
Replied by tommylight on topic Hurco KMB-IS CNC update
There are several Hurco retrofits on this forum, so plenty of info, but for the actual wiring and testing give this a good read:
forum.linuxcnc.org/10-advanced-configura...ning-detailed-how-to
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03 Oct 2020 22:05 #184741 by _big_
Replied by _big_ on topic Hurco KMB-IS CNC update
Attempting to connect the encoders.

They are Litton Industries with these numbers: 416 0248 010 27779

Googled a bunch and did not find any datasheets.

There are 5 wires coming out of the encoder.
color          My guess
======         ===============
Black          Ground reference
Red            Plus 5 supply
White          one of [a,b,index]
Green          one of [a,b,index]
Blue           one of [a,b,index]

My guess is the color coding of the wires is more or less standard.... but I don't know what that standard is. Any advice?

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04 Oct 2020 14:50 #184822 by _big_
Replied by _big_ on topic Hurco KMB-IS CNC update
Maybe I can answer my own question.

Seems like when I spin the shaft, the a and b outputs should change rapidly and index should pulse only once per revolution.

This resolves the index output. Randomly connect the the other two outputs a and b. If the direction reported by LinuxCNC is incorrect, swap the two wires.

Done.

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04 Oct 2020 15:06 #184826 by tommylight
Replied by tommylight on topic Hurco KMB-IS CNC update
That is correct.
Sorry for the late reply.

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05 Oct 2020 16:22 #184982 by _big_
Replied by _big_ on topic Hurco KMB-IS CNC update
Found an even better answer...

Attachments:

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06 Oct 2020 23:49 #185170 by _big_
Replied by _big_ on topic Hurco KMB-IS CNC update
Mesa 7i77 documentation error? I'm looking at version v1.20 which I downloaded from: www.mesanet.com/pdf/parallel/7i77man.pdf

I think the ENs and AOUTs need to be swapped in the pin list.

A pretty obvious problem??? Googling didn't find a problem report.



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07 Oct 2020 00:20 #185173 by PCW
Replied by PCW on topic Hurco KMB-IS CNC update
The manual pinout is correct

TB5 pin1 (bottom pin) is ENA0-

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20 Oct 2020 00:25 #186639 by _big_
Replied by _big_ on topic Hurco KMB-IS CNC update
Looking to get the spindle going.

Using an Allen Bradley 1336 Plus VFD. This VFD takes 0-10V for speed and a separate signal for reverse.

When I look at HAL pin ANALOGOUT5, initially its zero. If I click the spindle clockwise it goes to 1. If I click the other spindle button it goes to -1.

That all makes sense except I need a 0-10V (I can fix the scaling) magnitude signal and a separate forward reverse digital signal.

Looked through pncconf and don't see any options for this. Tried Googling and didn't find an answer either.

Is there a way to convince LinuxCNC and the 7i77 card to play with my VFD?

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20 Oct 2020 11:33 #186670 by tommylight
Replied by tommylight on topic Hurco KMB-IS CNC update
In hal:
-wire the analog out value to the ABS component in
-wire the ABS out to physical analog out.
That way you get only 0-10V on the output.
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21 Oct 2020 16:39 #186820 by _big_
Replied by _big_ on topic Hurco KMB-IS CNC update
Found something cool I wanted to make a record of.

I was planning on taking the original Hurco control panel and cutting out the existing CRT and tape drive holes for sort of LinuxCNC display panel. The owner of the machine wants to preserve the original Hurco control panel.

OK, so now probably I think we should use the existing Hurco swing arm and replace the control panel with a display/keyboard/mouse. But at the very least, we still require a hardwired E-Stop.

Lots of CNC pendants out there. Most of them USB based. USB will not provide a hardwire E-Stop and the MPG will be subject to "GUI delays" which are quite common with the RPi4.

Ran across this: wapl.es/cnc/2020/02/23/linuxcnc-jog-wheel-setup.html

Hard wired E-Stop and MPG :) Ordered one from Aliexpress.

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