confirguring OM controller for Drip feed

[DerHammer]

I have just purchased a general numeric knee mill with a fanuc om controller. I have learned how to do some basic functions on it, but now its time to configure for drip feed and really do some CNC.

I have an general fanuc manual but when it comes to step by step procedure, it always says (For details of the actual operation, refer to the manual provided by the machine tool builder)..... Since this machine was made in 1987, thats going to be hard to find, so please if anyone can hold my hand and help walk me through configuring the Machine controller to recognize my DNC software it would be greatly appreciated.

The Rs232 cable I have came with the machine in which the previous owner had it set up for a mastercam drip feed. I'm not using mastercam, so what parameters do I need to change, and how do I do it? Thanks

[Al_The_Man]

Normally the internal register G127.5 has to be set on with a switch, which is written into the PMC by the MTB.
You can look at the register in the Diagnostic screen, in some cases the switch has been added inside the panel.
http://cnczone.com/forums/showthread...ghlight=g127.5
Al.

[Dan Fritz]

You will need DNC software that can handshake pretty fast. The Fanuc OM has a very small input buffer, and if the buffer gets nearly full the Fanuc will handshake with an "Xoff" signal. The DNC software must stop within 10 characters or the Fanuc will stop with a "Buffer overflow" alarm (087).

If this machine has drip-fed programs before, I'm assuming that it's a 0M-B or a 0M-C. The 0M-A control could not drip-feed at all. Al_the_Man is right when he says that there is an internal register that must be "1" for the drip-feed to work. Many machine tool builders made it possible to set this bit to "1" with a PC parameter or a special "DNC" position on the mode select switch. If this bit is a "1", then you should be able to get the file ready to go on the DNC system, put the contol into "Auto" mode, and press CYCLE START to begin cutting. If the bit is not set to "1", then all you can do is run a program from memory in AUTO mode.

Your DNC software must match the baudrate set in the Fanuc's parameter 552, and it should be set to 7 data bits, Even parity, and Xon/Xoff handshaking. If you need software, contact my buddy John Hosmon at Refresh Your Memory, Inc. (www.rym.com). John's email is john@rym.com