Hello. I'm not sure if the below was posted before. Appologies if it appears twice somewhere. Apparently It was a blog before.

I'm currently designing a simple gantry style router. I've been trawling the forum but cannot find a picture to see how it's done so I thought I'd ask.

The gantry sides will be 40x160 aluminium profile similar to Shinobiwans, bolted to 20 mm thk profile bearing blocks.

My current dilemma is should I try just bolting straight through the profile ( the four bolt holes in each of the bearing blocks line up with the flats on the profile) into the bearing block or would it be better / easier / more accurate to assemble by using a intermediate spreader plate of say 5mm thickness between the bearing block and the profile of the gantry side?

Any guidance greatly received. Thanks

PS Great source of info - learn't lots from reading all the posts