Mesa 7i76e - adding MPG for lathe
03 Dec 2017 22:13 #102628
by andypugh
Replied by andypugh on topic Mesa 7i76e - adding MPG for lathe
The MPGs will exist if you set the 7i76 smart-serial mode to one that includes MPG encoders.
(Mode 2, according to page 22 of www.mesanet.com/pdf/parallel/7i76eman.pdf )
As far as I can see there is no way to set the sserial mode in PnCConf, so it appears that you will have to manually edit the INI file.
In the HAL file, near the top you probably have something like
You need to edit the "sserial_port_0="part to be 02xxxxxx, ie
(You don't _have_ to delete the firmware reference, but neither is there any point in it being there with a 7i76E)
You will then need to further edit the HAL file to use the encoders, but before you do that you can check that they work with Halmeter (machine->halmeter in the Axis GUI). You should be able to find some "hm2_7i76.0....enc0" type pins to watch.
(Mode 2, according to page 22 of www.mesanet.com/pdf/parallel/7i76eman.pdf )
As far as I can see there is no way to set the sserial mode in PnCConf, so it appears that you will have to manually edit the INI file.
In the HAL file, near the top you probably have something like
loadrt hm2_eth board_ip="192.168.1.121" config="firmware=hm2/7i76/7i76e.BIT num_encoders=1 num_pwmgens=0 num_stepgens=5 sserial_port_0=00xxxx"You need to edit the "sserial_port_0="part to be 02xxxxxx, ie
loadrt hm2_eth board_ip="192.168.1.121" config="num_encoders=1 num_pwmgens=0 num_stepgens=5 sserial_port_0=02xxxx"(You don't _have_ to delete the firmware reference, but neither is there any point in it being there with a 7i76E)
You will then need to further edit the HAL file to use the encoders, but before you do that you can check that they work with Halmeter (machine->halmeter in the Axis GUI). You should be able to find some "hm2_7i76.0....enc0" type pins to watch.
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03 Dec 2017 22:22 #102630
by rodw
Daniel,
2 posts on this page of my build
forum.linuxcnc.org/show-your-stuff/32029...utter-build?start=20
Covers everything you need to know about how to add an encoder for a single axis (eg with no axis select switch
forum.linuxcnc.org/show-your-stuff/32029...utter-build?start=20
Andy's example should work but it is only enabling one encoder with
Replied by rodw on topic Mesa 7i76e - adding MPG for lathe
Hi Rod
I have seen you worked a lot on this 7i76e MESA card. I'm going to use this MESA card for a lathe and I want to add 2 MPG. But now - how to change the configuration? In den PNCCONF it is not possible to add these 2 MPG to an input as proposed in the wiring diagram here on the forum. Of course - it is necessary to use the spindle encoder part for lathe spindle and that works fine. But I don't get to realise the configuration for the MPG's. I installed the MPG's on TB5 1-4. - Have I to change the .hal file manually (that would not be a nice work, because I have no experience in doing that)?
An idea? Thanks a lot and regards from Switzerland!
DAniel
Daniel,
2 posts on this page of my build
forum.linuxcnc.org/show-your-stuff/32029...utter-build?start=20
Covers everything you need to know about how to add an encoder for a single axis (eg with no axis select switch
forum.linuxcnc.org/show-your-stuff/32029...utter-build?start=20
Andy's example should work but it is only enabling one encoder with
num_encoders=1Please Log in or Create an account to join the conversation.
03 Dec 2017 22:45 #102634
by andypugh
Replied by andypugh on topic Mesa 7i76e - adding MPG for lathe
num_encoders has no influence on the mpg encoders (which are smart-serial devices)
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- Gommiswald
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05 Dec 2017 21:09 #102704
by Gommiswald
Replied by Gommiswald on topic Mesa 7i76e - adding MPG for lathe
Hi Rod
Thank you very much. I'll try it next friday and then I can give you a feedback.
Daniel
Thank you very much. I'll try it next friday and then I can give you a feedback.
Daniel
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17 Dec 2017 19:31 #103235
by Gommiswald
Replied by Gommiswald on topic Mesa 7i76e - adding MPG for lathe
Hi andypugh
Thank for your answer. I edited the hal file and now in the halmeter I get correct signals. Now the question is: how can I assign the mpg in the hal file to the axes? Maybe you have an example. That would be great. And thank you very much for your effort!
Daniel
Thank for your answer. I edited the hal file and now in the halmeter I get correct signals. Now the question is: how can I assign the mpg in the hal file to the axes? Maybe you have an example. That would be great. And thank you very much for your effort!
Daniel
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17 Dec 2017 21:03 #103243
by rodw
Replied by rodw on topic Mesa 7i76e - adding MPG for lathe
Now you just need to follow my example I posted earlier.
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17 Dec 2017 21:09 #103244
by andypugh
Replied by andypugh on topic Mesa 7i76e - adding MPG for lathe
This is what I have in my Lathe HAL file.
You would need to change the "7i73" part, obviously. And your jog-inrement source is probably not Touchy?
Because i have a separate wheel for X and Z the "enable"s are set to 1. If you have a selector switch then that would have to be set to choose the axis to jog.
Note also that I am using LinuxCNC v2.8 so I need to hook up both the axis.X and the joint.0
net selected-jog-incr <= touchy.jog.wheel.increment
net selected-jog-incr joint.0.jog-scale axis.x.jog-scale joint.1.jog-scale axis.z.jog-scale
net jog-x-counts joint.0.jog-counts axis.x.jog-counts <= hm2_7i73.0092.enc2.count
net jog-z-counts joint.1.jog-counts axis.z.jog-counts <= hm2_7i73.0092.enc3.count
setp axis.x.jog-enable 1
setp axis.z.jog-enable 1You would need to change the "7i73" part, obviously. And your jog-inrement source is probably not Touchy?
Because i have a separate wheel for X and Z the "enable"s are set to 1. If you have a selector switch then that would have to be set to choose the axis to jog.
Note also that I am using LinuxCNC v2.8 so I need to hook up both the axis.X and the joint.0
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19 Dec 2017 21:29 #103362
by Gommiswald
Replied by Gommiswald on topic Mesa 7i76e - adding MPG for lathe
Hi Rod
Thank you and I have seen your postings. Very helpful and I think that I will succeed.
Do you have an idea on how to implement a feed override with the 7i76e. I think it should work with an 10k Poti on input 00. But it is always the same: How to configure the HAL?
Daniel
Thank you and I have seen your postings. Very helpful and I think that I will succeed.
Do you have an idea on how to implement a feed override with the 7i76e. I think it should work with an 10k Poti on input 00. But it is always the same: How to configure the HAL?
Daniel
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19 Dec 2017 22:12 #103367
by rodw
Replied by rodw on topic Mesa 7i76e - adding MPG for lathe
I think I answered your question elsewhere.
It is a very good idea. with say a 0-24v analog input divide the analog value by 12 to give a 0-200% range. You can use mult2 to do this using 1/12.
Then scale and offset the result with the scale component. I am sure if you can do this, you will be considered a HAL expert!
It is a very good idea. with say a 0-24v analog input divide the analog value by 12 to give a 0-200% range. You can use mult2 to do this using 1/12.
Then scale and offset the result with the scale component. I am sure if you can do this, you will be considered a HAL expert!
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