I've converted an old optical measurement machine to a CNC router. It is a great machine, however, the z axis has a bit of chatter when cutting in hard material like oak or purple heart. I think that it needs another slide to firm things up. The number on the slides are THK SR15T and there are no markings on the rail. I have done some research but cannot find the exact part! Please help me locate the part I am looking for. I have a picture of the part here:
http://www.glenspeymillworks.com/CNC/CNC.html
Thanks!