Hi guys, I have a chinese 6040Z, 2.2kW, I want to measure and predict it's accuracy : for now I found how to measure backlash and linear motion precision and repeat precision. Both under no load. However I presume that when running on a workpiece the machine is much more heavily loaded and the aformentioned results are not extremely useful. If the linear guides bend because of forces on the spindle, the precision on the resultant workpiece will be lower.
Is there a way I can predict the accuracy on the workpiece? the best way I can think of is to measure the deflection of the endmill with a dial when applying a force to it with a dynamometer, at varied forces. Then, before a job, when possible I'd try to predict (with help from software, with endmill geometry, feed, rpm etc as input) the force exerted on the endmill. By using the former results I might be able to predict the deflection I'll be facing with.
Any better way?