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- Harrison M280 CNC Lathe, Setting up Threading using phototransistor
Harrison M280 CNC Lathe, Setting up Threading using phototransistor
25 May 2021 16:10 - 26 Aug 2021 03:18 #210237
by PhilCNC
Hello, I'm setting up my CNC Lathe, currently using a Mesa 7i76E and Zotac Zbox mini PC. I have a question regarding adding a spindle encoder, I'm currently using two Omron EE-SX1096-W11 and a wheel with 50 holes. This is what was originally on the machine. So now I need to hook up the 2 phototransistors to the Mesa board, should be pretty straight forward, but after looking at the spec sheet on these encoders I see that I will need to use resistors. I'm listening to any and all advice. I've searched around online and most people seem to use a rotary encoder that makes things a lot simpler.
Thanks!
Links to the spec sheets.
Phototransistor www.digikey.com/en/products/detail/omron...E-SX1096-W11/5864619
Mesa 7i76EMesa 7i76E
Thanks!
Links to the spec sheets.
Phototransistor www.digikey.com/en/products/detail/omron...E-SX1096-W11/5864619
Mesa 7i76EMesa 7i76E
Last edit: 26 Aug 2021 03:18 by PhilCNC.
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25 May 2021 16:18 #210238
by PCW
Replied by PCW on topic Harrison M280 CNC Lathe, Setting up Threading using phototransistor
You need a current limiting resistor for the LED (say 180 Ohm for about 20 mA LED current) You don't need pull-up resistors as these are built into the 7I76E
So (for 'A')
+5V --> 180 Ohm resistor --> LED Anode --> LED Cathode --> GND
7I76E 'A' --> Transistor collector --> Transistor emitter --> GND
So (for 'A')
+5V --> 180 Ohm resistor --> LED Anode --> LED Cathode --> GND
7I76E 'A' --> Transistor collector --> Transistor emitter --> GND
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25 May 2021 22:25 #210278
by PhilCNC
Replied by PhilCNC on topic Harrison M280 CNC Lathe, Setting up Threading using phototransistor
Thank you so much! This is exactly what I was looking for. Have a great day.
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26 May 2021 12:00 #210335
by andypugh
Replied by andypugh on topic Harrison M280 CNC Lathe, Setting up Threading using phototransistor
There is one of those in a workshop at work, proudly bearing the label that it was converted from CNC to manual by the apprentices. Which always struck me as an odd project.
What steppers / drivers does it have? I might have a set of spares (untested)
What steppers / drivers does it have? I might have a set of spares (untested)
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26 May 2021 12:01 #210336
by andypugh
For clarity, there is actually no connection between these facts. Which is why I am not sure that the drivers I have are from a Harrison.
Replied by andypugh on topic Harrison M280 CNC Lathe, Setting up Threading using phototransistor
There is one of those in a workshop at work, proudly bearing the label that it was converted from CNC to manual by the apprentices. Which always struck me as an odd project.
What steppers / drivers does it have? I might have a set of spares (untested)
For clarity, there is actually no connection between these facts. Which is why I am not sure that the drivers I have are from a Harrison.
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26 May 2021 14:14 #210349
by PhilCNC
Replied by PhilCNC on topic Harrison M280 CNC Lathe, Setting up Threading using phototransistor
Hi Andy, I removed the original control board, I felt like it would have been far more involved that simply gutting it and starting fresh. I'm currently using DM860A and DM556 drivers for the Z and X axis respectively. I've been struggling to setup the encoder signal going into the Mesa card and Linuxcnc. I followed the standard Mesa 7I76E wiring diagram and configured the spindle encoder using PNC config. I have attached my Hal file as well, I'm not seeing the connection to the pins on TB3 in the Hal file.
It feels like I am so close to having this all up and running.
![:) :)](/media/kunena/emoticons/smile.png)
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26 May 2021 17:06 #210363
by andypugh
Replied by andypugh on topic Harrison M280 CNC Lathe, Setting up Threading using phototransistor
Yes, there is nothing encoder-related in that INI file. Perhaps PNCconf created a new file somewhere else?
Open a halmeter and have a look at hm2_7i76e.0.encoder.00.count and see if the number changes as you rotate the spindle.
Open a halmeter and have a look at hm2_7i76e.0.encoder.00.count and see if the number changes as you rotate the spindle.
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26 Aug 2021 03:18 #218754
by PhilCNC
Replied by PhilCNC on topic Harrison M280 CNC Lathe, Setting up Threading using phototransistor
Thanks for the help Andy, it's mostly setup now but there seems to be a problem somewhere. When I command a G33, the machine does not move. I am getting encoder feedback though. I can adjust a variable in my Hal file to get motion with a G33, but it moves extremely slow! I feel so close to completion!
Here is a link to a video I took of this problem.
Any advise is appreciated! I will keep looking at other peoples files.
Hal and INI in original post.
Here is a link to a video I took of this problem.
Any advise is appreciated! I will keep looking at other peoples files.
Hal and INI in original post.
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26 Aug 2021 08:34 #218771
by andypugh
Replied by andypugh on topic Harrison M280 CNC Lathe, Setting up Threading using phototransistor
Does the spindle.0.revs signal _increase_ as the spindle rotates forwards? (And by 1.0 per revolution)
What is the state of spindle.0.index-enable when the system has "stuck" at the start of the G33?
What is the state of spindle.0.index-enable when the system has "stuck" at the start of the G33?
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27 Aug 2021 02:12 #218846
by PhilCNC
Replied by PhilCNC on topic Harrison M280 CNC Lathe, Setting up Threading using phototransistor
Hi Andy, looks like there is a problem. I opened Hal Scope and I didn't see a change on spindle.0.revs signal even as the spindle is turned on. Also spindle.0.index-enable is always off. I'm currently using a manual switch to turn the spindle on and off. I used PNC config to make the hal and ini files.
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