I realize it's been some time since this thread has been visited. Your design approach is very clean and simple compared to others I have looked at. I'm assuming that when you fabricated and installed the main mounting plate for your quill drive, this extra spacing had no affect on the back gear mechanism? It's been a couple of years since I had one of these heads apart. I believe that the coupling spacing for shifting the back gear is all contained in that upper housing and moving that whole assembly up a half inch or so has no affect on it. I'm also assuming you had to install longer studs to make up for the thickness of that plate. I have a WEBB CHAMP 4VK mill with box ways but has the smaller Series 1 J2 style variable speed head on it. Looking at at the exploded parts diagrams for this head, I believe this to be the case also. From your CAD drawings I figured that your using a 2.333... to 1 ratio between the servo and the screw. It appears from your pics that your using a 5mm pitch tooth belt and pulleys, is this correct? Also what diameter screw did you end up using and from what I see in your drawings and pics, you must have machined the ends of your screw yourself.
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