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    The machine bed is basically a frame, made out of two 1155mm long 80x80mm heavy duty aluminum profiles, which are connected by three 280mm long 80x40mm heavy duty profiles and one 80x40mm aluminum block. This massive block carries the MBA-15D servo motor bracket with the FK15 fixed bearing block and the 400W JMC servo.

    At each end of this frame is a 15x100x585mm end plate, one with the FF15 loose bearing block.

    Ball screw is a TBI DFU2005 with a double nut. I have the same on my UHPC router and I could not measure any backlash (at least with my equipment...)

    The Hiwin HGR20R rails with pre-loaded HGW20CCZAH flange carriers are bolted to 20x80mm aluminum strips, which in turn are bolted to the 80x80mm profiles. The carriers have KK heavy duty seals in order to deal with the fine wood dust.

    Neither the rails, nor the aluminum profiles are perfectly straight, so in order to have a halfway precise machine you need to mill a flat seat and an alignment edge for the rails.

    But rather than further weakening the already thin profiles, I prefer to add these strips. They are first bolted to the profiles and then the flat surface with a straight edge is milled.

    Before that the profiles are filled with epoxy and a 40x40mm steel bar. This way I can add 25kg to the bed. With the 25mm thick acetal fixture plate the whole bed is 100kg

    The machine feet with a rubber damper will be bolted to the work bench from the bottom, so wobbling should be no issue...
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