I decided that the 3mm ply was going to go into the vac bag at the same time as the back panel, so 5 @ 0.6mm mahogany veneers were sliced up:
There's quite often some online discussion about the most dangerous tool in the 'shop, but there's absolutely no question in my mind that it's a Stanley knife with a new blade, especially when it's used with an ordinary, thin steel rule. I've been to A&E
twice when the knife jumped the rule and went straight across my thumb; I still have the scar
s on my lh thumb to bear witness. I now only
ever use the thick edge of Maun straight edge for cutting veneers.
This is the stuff needed for glueing the 'lay-ups':
I decided not to use the small Gluebot as it was virtually empty; the black speader was dropped into the water jar as soon as the glue's been adequately spread. Starting with the Ash back, the first joint was hung over the edge of the bench:
...and a smear of TB3 run down the joint on the two veneer edges....all joints glued in the pic. The face walnut lay-up was treated in the same way and then glue was applied to the substrate only, making sure that there's a decent coverage, inc the all important edges. The lay-ups were quickly assembled and then nudged into position, bearing in mind that there's plenty of waste at the sides to be trimmed off later. Once it's about right, copious amounts of masking tape:
...were used at the corners and sides to hold everything in more or less the right place before it's placed in the vac bag, after which it's sealed and the suckage applied:
When the dial needle hits the buffers it's pulling a full vacuum; also shown in the bag is the 3mm plywood being glued. After a couple of hours, both bits were extracted from the bag; the tape can be easily lifted with water, a sponge and a cabinet scraper. This
can't be done if a non-waterproof glue (eg TB1) is used as the veneer will lift! Don't ask me how I know :eusa-doh: :eusa-doh:
Unfortunately for reasons best known to itself, the mahogany veneers refused to glue together in the vac bag, so they were left overnight:
...between cauls with a bunch of cramps on, which seemed to do the trick when I took them off this morning. Once all the old tape and general grunge was cleaned of the walnut:
..the glue joint is all but invisible (as it should be) but it's easy to tell there are two book matched veneers because of the grain pattern. Were they to be slip matched, it would appear to be a continuous sheet of walnut as the joints can't be seen. Working from the walnut joint line, the panel has also been marked out and the waste cut off so there's about 6mm or so left for fitting later into the rebate - Rob