[mcphill]

How did you get such precise positioning of the inserts prior to the pour? I assume that was done at this point, right:



I would think the melamine/particle board would not provide enough stability to hold the parts in a .001" tolerance over too long a distance, is that not correct? Or did you clamp them to ground gauge blocks to keep them a precise distance apart? Or ???

Looks great, just trying to think of how to do mine...

[gt40]

How did you get such precise positioning of the inserts prior to the pour? I assume that was done at this point, right:



I would think the melamine/particle board would not provide enough stability to hold the parts in a .001" tolerance over too long a distance, is that not correct? Or did you clamp them to ground gauge blocks to keep them a precise distance apart? Or ???

Looks great, just trying to think of how to do mine...

I through bolted 1 ground steel bar to the melamine board with coupling nuts and bolts. Then I used a verified square granite surface plate and aligned the other ground steel plate to that, prior to bolting.

As you might surmise from the above pic, I started loose and then moved the granite from one end to maintain the same distance from the first keeping it tight to one side. Kind of a giant heavy witness block. After I was done, you could slide the granite surface plate from one end to the other with zero gaps and both steel plates parallel as a result. Bolting the melamine to the ground steel bars every 80mm/3.14" keeps everything pretty straight and the steel bars are 3" wide. I was going to bolt precision ground stock as crossmembers to keep it aligned but after indicating the 2 bars bolted to the melamine, I didn't need to- the epoxy granite will hold everything anyway. Hope that helps

[mcphill]

Hope that helps

Certainly does, thanks!