Hi thank you for the advice it's just what I needed I helps a lot on the design I was planing to use cap heads and sink them level with the surface.
This brings up another couple of questions.
1. Over a 600 mm length can I expect any flex on the gantry this will be an aluminium plate 600x150x15.
2. Should the bolts used be stainless steel or high tensile ones.
Thank you
Albert