Before troubleshooting a UMC-750 accuracy or geometry problem, the tech must have a thorough understanding of the following fundamentals:
A problem with UMC-750 machine geometry or accuracy needs to be approached systematically and in the proper sequence. The following information should be adhered to strictly and followed in sequential order.
It is absolutely critical that before any assesment or adjustment is made to the machine geometry that the machine has been checked for proper level and alignment of the rotary axes to the machine
Many errors can be attributed the the machine suffering a crash or problems either with tooling applications or programming issues. Do not attempt to change machine geometry with out completely checking the machines overall level and geometry per the UMC-750 Inspection report. This includes checking the Machine Rotary Zero Point (MRZP).
In the event of a crash there are 4 slip joints on the machine. These areas are the spindle head to the ram, the ram to the saddle, the saddle to the bridge, and the trunnion to the trunnion support.
Note: none of these joints should ever be shimmed. A machine crash should never change the amount of shims required in the machine from the factory settings.
It is important to remember the Linear accuracy of the machine is 0.0004/10" and the angular accuracy is +/- 15 arc. sec. These tolerances can add up quickly.
Every effort should be exhausted to determine if the machining application is reasonable and within the machine, fixturing, and toolings ability.