Stitch welding and lapping the steel baseplate for mounting the HGR25 rails, ballscrew and motor. Base is 8″x1/2″ steel plate with stitch welded 1-1/2″ x 1″ cold rolled flat bar. The rail mounting face was then progressively lapped with abrasive and a granite surface plate. A reference edge for 1 one the linear guideways was added, also lapped and shimmed to be straight using a Starrett straight edge. This weldment is the foundation of the machine, it will be cast into an epoxy-granite mix or a non-shrink precision grout with aggregate, with some other steel components that will become mounting points for the upper axes.
00:00 First axis movement
00:08 Stitch welding steel parts + fixturing
00:20 Stitch welding results
00:28 Testing the carriage fitment
00:34 Lapping with surface plate
00:38 Checking straightness with Starrett No. 380
00:45 Rail reference edge
00:52 Checking reference edge straightness
01:07 Marking and drilling 5mm holes for M6x1.0 tap
01:33 First check of the rail straightness – to be improved later
01:50 Weldment with ball screw and motor
01:58 Carriage assembled
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