Finally reached the page on testing the accuracy of the axis and while the guide on sizes of the printed models indicates that the step sizes hshould be changed to get the right result, I was not in agreement. Certainly the likes of the Taig mill has a very accurate set of lead screws and number of steps per inch ( they are imperial threads ;) ) is a accurate value. Michael at Teaching Tech does a nice job of explaining just why you do NOT measure the prints and has confirmed my own thoughts about the small discrepancies I am measuring. That the large part is only 0.25mm under size I think confirmes that the calculated values are the right ones, but I certainly need to address the belt tension problem which is currently a little slack! |
