I actually just picked up a mag drill a few days ago, that's kinda what spurred this whole discussion. And I've built a few things lately that would have been really nice to have some pre-drilled spots just for squaring/layout, as well as clamping.I'm not completely sold on a table full of holes for what I do. I know many who have them drilled like swiss cheese and on as small as 2" centers. If that fits your needs then I understand but I worked on a friends table that was on 3" centers and it drove me nuts. We weren't fixturing anything, I was helping him work on his small generator and he had it sitting on his table. It really messed with my OCD every time I set a tool or screw down.
My fabrication table has been "holeless" for the past 15 years. Mainly because I also use it for more than solely fabrication/fixturing so I didn't add any holes, that is until this year. Over the summer I had a job come into the shop where I was welding some large weldments and was having a difficult time clamping them down in the middle of the table. I will usually do most of my clamping around the perimeter so no need for clamping in towards the middle but this job was a bit different and it got me thinking that I wished I had a few holes spaced throughout the middle of the table for clamping.
I had also been contemplating a mag drill so when my local welding supply had them on promo I bought one and decided to try it out by adding a few holes to my fabrication table.
Laying out the table. The blue tape represents the structure under the 1/2" top.
I also drilled and tapped a few holes for my axle fixtures to bolt to the table.
I purchased some F-clamps and cut/modified about a half dozen for slip fit into the 5/8" holes and so far they've been working well. I like the spacing and doubt I'll add any more holes as so far these seem about right for the work I do. I have a couple of smaller fixturing plates that I used when I was building sand drag quads and sand rails for things like suspension components that I merely set on top of my table and can bolt to them so no need to add more holes to my table at this point.