ok, no time last night to get to the details of this upgrade, so here we go...the four wheel "trolleys" used here are made by unistrut, to fit their P1000 strut channel...they were $21.00 each, so no great expense there...unistrut used spring pins for axels, which made the axel hollow...that detail allowed me to glue a plastic nylon, 10-32, pan head screw into the hollow axel...this allowed me to set the sideways movement of the trolley to an almost zero tolerance, by filing the head of the screws so the fit was perfect...so lateral "slop" is taken care of, quite easily...the long, nylon, 1/4-20, socket head screw in the middle of each trolley, is for the vertical adjustment/"slop of each trolley...set it once, and your done...we put a 7/16" X 7/16" steel bar into each trolley, that had three, drilled and tapped, 1/4-20 threaded holes so the trolley could be mounted to the carriage plate(2" X 1") and for the nylon, height adjustment screw...this bar was welded in place, and the size from McM/Cr fit perfectly, just had to cut to length...the carriage plate is just some 2" X 1" flat bar(2 pcs.) and some 1" bar, with the appropriate mounting holes, drilled and tapped...no difficulty there...the "Y" carriage bolted to these trolley "units"(front rail and back rail) with a washer or two, used for proper shimming and to achieve the proper height for the lead screw split nut to work properly...all in all, an easy mod to have the "X" axis on a linear bearing, crude as it may be...it is not to CNC standards, but certainly a huge improvement when doing legacy manual wood turning and/or milling...total parts cost was just a bit more than $100...labor, I did not track, but I would think this is a one day job...thanks...joe b.
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