Yesterday I set one rail parallel to the steel beam and bolted the steel to the carriage mounts to check that the gantry beam had the holes in the right place.

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I had to drill some new holes as in my rush on Thursday I drilled the pattern 90 degrees out (less haste more speed!) Managed to loosely bolt the gantry in place but ran out of time so had to unbolt it all again. Need to get a shift on as now only got the workshop facilities for another month...