CNC control diagnostics- Mysterious "descriptions" on drawing to interpret..

[Milacron]

In the below PDF file, sheet 4 (incl cover), any idea what (sp) and (mc) might mean ?  (sp) is used regarding a simple momentary switch, tempting to guess "single point" but (mc) is used for simple ST1 limit switches.  One is tempted to guess "momentary contact" but seeing as the "switches" are that way as well, I'm not sure what to think.


http://www.practicalmachinist.com/fnc60diagnostic.pdf

[Kremmen]

Elsewhere in the document  there are several inputs that definitely appear on a CNC machine operator panel so one is tempted to guess that (P) could mean (operator) Panel. Extrapolating from that, SP could be Service Panel, maybe? If there is such a thing in the machine.
MC could simply mean "MaChine" since many of the inputs could plausibly be limit switches and similar.

What is the nature of your interest? Fixing a broken machine / rebuilding / something else?

[Milacron]

What is the nature of your interest? Fixing a broken machine / rebuilding / something else?

Thanks for the input.  Isn't it lame that they can't simply spell out what they mean ?  If (MC) means "machine" why can't they just put (machine) ?  Like they were too lazy to type out another 5 letters.   

Re nature of interest, repair.

[Kremmen]

Assuming you have the macine to be fixed in front of you, why not trace one of these inputs to see where the leads - hmm - lead. That way you can confirm my hypothesis or disprove it and maybe come up with a better one.

[Milacron]

FWIW, numbers beginning with X are inputs, Y are outputs.  Each bit has corresponding page number in electrical schematics, and description of it's purpose.  Dynamic diagnostic parameters can be brought up on CRT to examine 0 or 1 in real time depending on switch or limit switch positions.  The tricky part is knowing what should be 0 and what should be 1 depending on circumstance.  With tool clamped I was getting a 0 where I think there should have been a 1, which led to limit switch adjustment.  Machine now working properly but I'm not positive it's due to my adjustment, could just be the mood of the machine...we will see.

[er11]

Hello,
MC : machine cabinet
SP : spindle
P : controle panel