Hi all I have a interact 1 mkll with a 2500 heidenhain control,there has been a issue with the y axis motor for some time now with rapid movements in and out with the control going into error,but I have been able to override the issue by tuning parameter 1010.1 by going from 5000 to 3000 but the motor felt really grainy.So we decided to remove it and found the tachometer brushes were all gummed up with oil,so after a really good clean of all the brushes and other components we reassembled and refitted the motor,reset the axis limits and tuned the tachometer pot lag to the correct value.So now we have a motor that's silky smooth that runs full rapid in the + direction but errors out in the -direction which means we still have to run parremeter 1010.1 at 3000 to stop it from erroring out.The motor is smooth in both direction and all components are in perfect order.Anyone struck this problem before cheers greg.