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you must use g50 S**** so you can limite the spindle speed.
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I have a lathe with fanuc ot and it does not seem to correctly be reading the diameter of the stock correctly and when in g96 constant surface speed it tends to overspeed or alarm out. Any ideas? Thanks
you must use g50 S**** so you can limite the spindle speed.
I do use g50 and it still errors out.
Please give us more data about your machine, spindle amplifier type, cnc type, iso program....
Try invoking G96 after bringing the tool near OD of the workpiece. And cancel it before sending the turret to home position.
post your program, please
THE PROGRAMMING LOGIC OF G96SXXXX MEANS NOT SPEED BUT SURFACE FEET
THAT IS IF I PROGRAM G96S600 AT A SPECIFIED RADIUS FROM CENTERLINE THE
SPINDLE WILL ATTEMPT TO MAINTAIN 600 SURFACE FEET..... AT .0001 FROM CENTERLINE
VECTORING THAT OUT WOULD RESULT IN MILLIONS OF RPM.
EECENOD,Originally Posted by EECENOD
This is already established. The G50 Snnnn should limit the RPM to nnnn, but it's not, hence the reason for Daniel Boone's original post.
Any possibility that your control is set up to use G-code system B or C, which use G92 Snnnn to specify the maximum RPM during G96 mode?
Is there a possibility the spindle encoder is giving problems or where driven from a small timing belt, belt slip or failure could be the problem.
Al.
CNC, Mechatronics Integration and Custom Machine Design (Skype Avail).
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.
Its not just overspeed, underspeed can cause issues also.
you need to set min and max speeds, i.e. P 200 Q2000.
Have you tried G92 ?
In all my years of programming Fanuc controlled lathes, I've never seen a command to set minimum RPM. Please explain the use of P200 and Q2000 to set min and max speeds.
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