Friday saw the Slate connect to the cart.
The short horizontal run of square tubing is glued to the slate with Liquid Nails. Prior to gluing I clamped the bars in place, gapping them from the longer bars with washers. This ensures that the slate can be removed/re-set without too tight of a fit, which could then snap the slate. With the bars and spacers in place I drilled a pair of holes for each side. I took off each of the short tubes and ran a bead of Liquid Nails along the top, then pushed them up into place and tightened them into place with bolts.
While the glue set I wiped all the metal down with acetone, then began etching the metal on the base and the sculptures with chemicals, encouraging rust and copper tones. Once this bit in, I hit with liver of sulfur to tone things back. Over the course of the weekend I continued to spray the forms with water and/or chemicals to further activate the oxidation process.
Some steel alloys had high iron content and turned deep orange, while other alloys reacted more to the liver of sulfur going gray or black. The variety of oxidation adds to the effect of long hard use.
Today was spent getting the two machines to mount onto the slate. This was a bit of a trick, as they wanted to roll off or just slide off sideways- steel wheels on slate is like skates on ice. I came up with a system that keeps everything from sliding or running off either end, all with a run of small angle-iron attached to a riser of square-tubing. The square tubing sleeves over a smaller square tubing that seats into the big runs of square-tubing supporting below the slate. With a bolt run through both sizes of tubing to keep everything in place, and also allowing it to be removed, so that the slate top can be removed for transport. It is fairly well hidden from the front, although it runs the entire length of the forms and the slate. This is an important consideration, as there will be as much as 200lbs of granite added onto the already weighty machines.
The metal of the slurry spreader is an odd steel alloy that is resistant to rust. With heat and multiple chemicals it began to etch, and it has a great relationship with the marble that represents the slurry spray. The spreader seems as if it has taken years of fine spray from the marble.