My HURCO mill has worn down to the point that I have about .0027" Accuracy.
However - ignoring time/thermal changes, my repeatability is better than .0002" So - after a quick but complete first article inspection I add a few creative white lies into the program so that the key feature which are tight tolerance are all in proper position and size. Being able to trust the repeatability is how the money is made. Likewise if there is not room in a bid for some setup material or the overall tolerances are just too tight for your machine you need to know when to say No bid and let someone else take a gamble on the job. If you have to add encoders, there are ways... If your servos drive the ballscrews with belt drive you could bolt an additional pulley to the existing one to drive the encoder, or you could bolt on an extension that goes directly into an encoder. Adding an 1/8" Aluminum plate to mount an encoder is not too hard. for direct drive ballscrews I have seen pulleys mounted on the motor side of the flex coupling. A 3/16" wide MXL belt is plenty to drive an encoder. Good luck with it. Greg ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
