[Pogojo]

Using a Fanuc 18i-T controller. During a threading cycle G92 I want to spin a part @ 100 RPM. It's a 1" pitch so I set my feed to F1.0. I'm not getting a 1" pitch. The display shows about 80 in/min while running instead of 100 in/min. I'm pretty sure there is a parameter the sets a max feed rate but I've tried changing a few thing in the 1400 block of parameters but I still can't get it. Any help would be greatly appreciated. BTW, this is my first post.

Thank You.

Shane

[fordav11]

Parameter 1422 sets the maximum feedrate of all axes.
Parameter 1430 sets the maximum feedrate of each axis.
If 1430 is all 0's then the machine uses the setting in 1422.
On my machine the maximum rapid rate (Parameter 1420) for X axis is 18000mm/min and Z axis is 24000mm/min.
My parameter 1422 is set to the lowest rate 18000mm/min.

Therefore your maximum feedrate can only be as fast as the axis with the lowest rapid rate (usually X). Normally the Z can move faster than the X so you could theoretically set the maximum feedrate in parameter 1430 for *each* axis and the machine will use that parameter to limit the maximum feedrate.

Be aware that the maximum rapid rate (parameter 1420) is set at the factory based on servo type and mechanical limits of the machine and parameter 1422 and/or 1430 should not be changed to a faster rate than what is set in parameter 1420 or you could cause machine/servo damage.

[Pogojo]

Ok its not a feed thing, Thanks. I'm telling the spindle to spin 100 rpm and its only going 80.....not sure why yet