Tramming the spindle will tell you how perpendicular the spindle centerline is to that particular spot on the table surface. It will not tell you the perpendicularity of the spindle centerline (or the Z axis) to the XY plane. The actual level of the machine is almost irrelevent. If all the machine components are fixed at the same level values and the machine is straight and square you will be able to machine straight and square. Sent via BlackBerry from T-Mobile
-----Original Message----- From: "Florian Rist" <fr...@fs.tum.de> Date: Wed, 02 Dec 2009 17:04:26 To: Andy Pugh<a...@andypugh.fsnet.co.uk>; Enhanced Machine Controller \EEMC\"<emc-users@lists.sourceforge.net> Subject: Re: [Emc-users] How to Correct Angular Axes Misaligment in Software? Hi Andy > I think that truing up the axes can be seen as part of the > installation and commissioning procedure. Well, it should be, but in this case the machine was delivered and used productively right away without any in-depth testing and up to now the errors were not noticed because the mill is usually used by students to mill simple parts for architectural model making. > Does the machine have a twin-drive X axis? No, it´s a single steeper motor on the y axis and it´s rotation is transmitted to the two y axis lead screw by a tooth belt. > It sounds like it is possible that the drives are out of synch, ... > If the drives are linked by a belt, then it might simply be a case of > releasing some shaft clamps and running the axis up and down my hand, > re-tightening and re-checking. I tried that, unfortunately I can only move one side by about 1 mm (about 3 mm would be required). > Z-axis alignment might also turn out to be relatively easy. A dial > indicator mounted on the spindle such that it describes a circle on > the machine table will give a very good measure of squareness, and > will also indicate how your adjustments are working. That´s how I measured the misalignment. I also have a coordinate measuring arm at hand; it might be useful when I deice to take apart larger parts of the machine to cure all misalignments. > It is not uncommon to find jacking screws built into the > linear rail mounting arrangement, for example (but this might > not be relevant to your machine) I don´t´ see any, unfortunately. > Given the machine type and the reported problem, I would be > concerned that the axes are twisted and "fighting" each other. It looks like the table is deformed from rectangular to a parallelogramlike shape. The table is just a bolted aluminum construction and it´s lacking a diagonal element to stabilize the rectangular shape. > Is the machine securely bolted to the floor absolutely flat > and level? Yes. > Even traditional cast iron machines can be twisted by uneven > floors, and it is more likely to be a problem with a fabricated > steel/aluminium frame. A good spirit level should show up > any twist (check it both ways on all 4 edges) I did when the machine was installed, even tough I didn´t have a high precision spirit level. The machine should be horizontal with a maximum deviation of 0.5 mm per meter. Good enough? See you Florian ------------------------------------------------------------------------------ Join us December 9, 2009 for the Red Hat Virtual Experience, a free event focused on virtualization and cloud computing. Attend in-depth sessions from your desk. Your couch. Anywhere. http://p.sf.net/sfu/redhat-sfdev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users ------------------------------------------------------------------------------ Join us December 9, 2009 for the Red Hat Virtual Experience, a free event focused on virtualization and cloud computing. Attend in-depth sessions from your desk. Your couch. Anywhere. http://p.sf.net/sfu/redhat-sfdev2dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
