wORKS LIKE THIS
G4U3.(#953-WAIT FOR VARIABLE TO UPDATE, MAY VARY)
#500=12(ACCEPTABLE-#953 GOOD CLAMPING VALUE)
IF[#953LT#500]GOTO953(COMPARE TO ACCEPTABLE VALUE)
M98H1 (RUN BACKWORK)
N953(JUMPED OVER BACKWORK FROM "IF")
You may need this in multiple locations depending on the configuration of your program. Examp. multiple sub programs.
Note: Clamping pressure varies slightly so allow some learning time to get it correct and have a dump before pickoff to avoid a crash due to a part being in the spindle.