Fanuc M-Code

[bz1801]

I came across an old nc program for a Fanuc 0T control on a LeBlond lathe. One of the first blocks in the program has an M55 command. This M-code is not listed in my Fanuc control manual, and I can't seem to find any info on it. Does anyone know what M55 does on a Fanuc 0T control?

[mxtras]

I think it is a user defined coordinate offset, isn't it? M55 through M58 are (I believe) user defined coordinate offsets in the Fanucs.

Change to M56 and see if the displayed position changes. If so, then that is likely what it is.

Scott

[Al_The_Man]

It would probabally be unique to that particular machine as Many of the M codes have to be written/decoded in the machine ladder logic by the machine tool builder or retro-fitter, so they may have used a particular output for a special function.
Al.

[Al_The_Man]

Originally Posted by mxtras I think it is a user defined coordinate offset, isn't it? M55 through M58 are (I believe) user defined coordinate offsets in the Fanucs.

Scott, I believe you are thinking of G55 to G58?
Al.

[mxtras]

Oh, crap. Yup. Sorry.

This is MY monday, guys. Thanks, Al.

Scott

[psychomill]

Like Al says, the M codes are usually set and arranged by the machine builder. Short of someone having the same lathe, you'll need a book for the lathe or try contacting Le Blond (or makino) to ask. M55 could be just about anything from say retracting the tailstock (which it hapens to be on a Okuma) to unclamp tool pot or just about anything else.

[bz1801]

Thanks for the info, guys. I did some digging and found the binder for the lathe. It turns out M51 thru M57 are for setting headstock into 1st gear, 2nd gear, etc. Then each gear has a max rpm for spindle speed.