Bruce Caulley

4th axis unwind on Fanuc Oi Horizontal borer

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I am so rusty.....

Operator here has a simple programme on the borer that uses some B moves.  When rapiding from B40 to B20 the machine is trying to do a lap of the block rather than just reverse 20 degrees.  Control is a Fanuc Oi, and from memory there is a parameter that determines either shortest distance or positive only rapids.  It's been years since I've been running a machine or programming.  Any help appreciated.






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You need to use shortest motion set in the rotary axis parameter... is it set as an EIA axis?

I´m sorry, I don´t know the parameter number and the bit for Fanuc now...

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I think it's parameter 1008 bit 1 that needs to be set. Can't remember if it needs to be 0 or 1 to allow shortest move.

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