what are the disadvantages of not having encoder index signal on mesa 7i77 card

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30 Jan 2017 06:18 - 30 Jan 2017 06:24 #86948 by reliantkill
reliantkill created the topic: what are the disadvantages of not having encoder index signal on mesa 7i77 card
what are the disadvantages of not having encoder index signal on mesa 7i77 card?
I am putting a laguna cnc mill machine together and when I finally got to connect the encoder cable to the 7i77 card
I realized that I have only A / B signal coming out of my encoder, and is single ended 500 ppr.
Now what? I am going to need to change the encoders or I can still use them without Index signal
help is encouraged!
the encoder is a BEI L25G-500-AB

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Last Edit: 30 Jan 2017 06:24 by reliantkill.
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30 Jan 2017 12:52 #86962 by tommylight
tommylight replied the topic: what are the disadvantages of not having encoder index signal on mesa 7i77 card
You can use it, of course, the only thing i know will not work without index is rigid taping, if that encoder is on the spindle. It would be nice if you can confirm this, as i am way to long without sleep so i might miss something.
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30 Jan 2017 15:46 #86976 by PCW
PCW replied the topic: what are the disadvantages of not having encoder index signal on mesa 7i77 card
That's correct, you need a spindle index for threading or rigid tapping
also for motion axis, the index allows more accurate homing
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30 Jan 2017 15:52 #86977 by cncnoob1979
cncnoob1979 replied the topic: what are the disadvantages of not having encoder index signal on mesa 7i77 card
As tommy said rigid taping will not work for the spindle encoder if an index is not available. Also homing using index will not work as well. I have one encoder on my machine that the encoder does not produce an index which is not a big deal. I just use my home limit switches anyway.

I think that is the only "standard use" of index signals in linuxcnc, of course can be wrong. :)
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30 Jan 2017 17:40 #86981 by reliantkill
reliantkill replied the topic: what are the disadvantages of not having encoder index signal on mesa 7i77 card
My machine has Axis X,Y,and Z with single ended AB channels only. There is no encoder for the spindle yet, that I still have to get one to install it, so I will make sure the spindle encoder has the index signal in it. Thanks for the information.
In the configuration for the 5i25-7i77 does the system will keep on looking for the index signal, will this create an error? and do I have to disable the index signal somehow so the system does not keep on looking for it?
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30 Jan 2017 17:56 #86984 by cncnoob1979
cncnoob1979 replied the topic: what are the disadvantages of not having encoder index signal on mesa 7i77 card
No it will not. It pncconfig will just create the links to the signal but it will be transparent to you.

This is the setup I use. 5i25/7i77.

Can give you my configuration if it would help.
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31 Jan 2017 00:45 #87020 by reliantkill
reliantkill replied the topic: what are the disadvantages of not having encoder index signal on mesa 7i77 card
yes I would like to take a look to your configuration
can you post it here or need to send it directly to my email?
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31 Jan 2017 01:20 #87023 by cncnoob1979
cncnoob1979 replied the topic: what are the disadvantages of not having encoder index signal on mesa 7i77 card
I installed a HB04 pendant so a lot of my physical panel is disconnected. Anything with a # in front of it has been disconnected. Hopefully you can find something to help you in my mess :)



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