I have changed the belt position and change the parameters as you said and it does now appear to run to 6000rpm. The only problem now is that I don't have any way of confirming the spindle speed as there is no encoder on the spindle. How do I know if Fanuc is using the correct ratios? Any ideas on a...

At the moment the values are
540 4000
541 4000
542 4095
543 0035

Am I right in thinking that if I change 540,541, to 100 and 543 to 6010 then if the program speed is between 100 and 6000 the machine will always think it is its high gear. Or have I missed the point somewhere!

Hugh

Sorry I forgot to mention it is Fanuc OM. would this make a difference?

Hugh

I have a Denford Zerocentre CNC Mill. At the moment if you program a speed of greater than 4000rpm the actual spindle speed drops as the machine assumes that a gear change has taken place. The only way of changing the drive ratio is to change the position of the drive belt to a different set of pull...

I have a Denford Zerocentre.

I require Spares of the spring clips which hold the toolholders into the Tool Changer Carousel.

Can anybody help?