Matthew Masail wrote: ↑
Mon Jan 14, 2019 7:23 pm
Yes I am making rosette tiles. this is my first guitar. the spokeshave did a perfect job thicknessing very evenly, though I understand the overall need for the type of control granted by something like the Fleta jig for fine tuning - Thank you for explaining it!
I am not clear about the set up you use, I imagine the printer's quoins are used as clamps and the UHMW and non stick cauls, but what is keeping the strips in alignment? perhaps I don't understand what the quoins really do.
Hi Matthew - The UHMW plastic is the caul - I use it in 3/8" thicknesses or so, which I get at a plastics store. The quoins come in various styles and sizes (see picture). And like you suggest, they are used as clamps here and in their original use in typesetting. On the extreme outsides are a piece of wood clamped to the bench, inside that (on each side) are the quoins, and then the UHMW. In between these two (wood, quoin & UHMW) assemblies, is the tile. I first hold the block of columns (which is the tile, but about 7" long), together with my fingers. Everything gets pretty slippery, so you can move it around pretty easily. The down side is it is very easy to get it uneven in thickness and out of square. Also, I tried HHG, which I use for almost everything else, but for my tile process, it was too hot on my fingers! Once the assembly is set-up, I hold it with my fingers and make sure everything is square and in-place. Then, I slowly tighten the quoins - not much because I don't want to squish wood. Check, and then add a top piece held very lightly with clamps.
For small titles, like the very outer ring of a rosette, I don't use cauls. And, for assembling each column that will be part of a tile, it depends on whether I am assembling a long and wide glue-up that will then be sliced into many columns, or a one-off, where I first cut the long thin pieces and glue them into a single column. In the latter case, I just use two steel rulers between which are a glued-up flat bundle of sticks, which I hold until the column is dry enough to set aside and do the next one. But in a big tile, I follow the process above.
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