fixing into a concrete garage/router planing sled

[marcros]

I need to fix a horizontal rail into my concrete sectional garage. It needs to have a perfectly flat top, and so I was planning to use a piece of extruded plastic fascia, since I found a couple of lengths behind the garage that will do. It is to be 8ft long and is to form a support rail of a router planing sled. The rail needs to be stood away from the wall about 3/4" so that the sled bracket can hook over it and run along. I have bought a few spacers for this whilst buying some handwheels (Banbury Plastic Fittings- excellent website). I was planning to fix one end of the fascia, and have the other fixings on slotted holes, so that i can adjust them to level- i dont want to take a reference off the floor. (1st job when complete will be to level the work bench to the new sled, to zero it). And I want it to be level to within 1/32" if possible. The other rail is to be held in my cult classic work mate (on its way to me) with adjustable feet (may need to be replaced, but thanks to BugBear I now know that the thread is M8). If necessary I will get a triton multistand if additional support is required.

A sketch is attached.

Anyway... the question is what fixings to use and how to created the slotted holes. Could I use any form of masonary screw or do I have to go with thunderbolt type fixings? I can, if necessary fix a wooden batton, or wooden pads to the wall using whatever fixings necessary and then screw the fascia to that using wood screws.

Weight bearing down on the rails will be a few kgs of router, the sled which is probably about 6kgs.

Thanks as always
Mark

 

[carlb40]

I would probably go with a wide-ish batten. Drilling into concrete and getting the accuracy you want will be difficult. So batten first - level within reason. Then you have something easy to fix to to fine tune the top.

 

[marcros]

Carl,

i have to admit that i was favouring that, even though i only thought about it after typing the post out. The batten doesnt need to be that level, even, as long at the fascia is.

Cheers
Mark