Safety alert with the aluminum plate cutting.
I mentioned screwing a piece of 1/2" plywood to my wood saw table, then raising the saw blade 3/8 of an inch up through a scrap of plywood. Mainly to dampen the noise control the shavings, but also so I could soak the plywood with WD-40 to keep the blade lubed.
That worked fine for cutting a 12" wide piece off of a 22" wide sheet of aluminum.
I discovered that with last nights plate cuttings, that one side of my table saw fence was out of square with the table.
I decided to re-cut the main 9x12 piece of metal that was out of square. I wanted to trim off about 1/8 of an inch of material. ...same width as my blade.
As a reminder, I ran my saw blade up through a piece of scrap plywood thus creating a zero gap in my blade and work surface.
...not so swift an idea.
Events
slowly went awry
Ya see, cutting off this
narrow 1/8" strip, the saw blade of course created
a slight downward burr, which
slowly dug into the plywood near the blade and steered my 1/4" aluminum away from the fence and into the blade.
I stopped pushing on the piece and held the metal plate firmly down against the table and unplugged the extension cord to my saw using my feet. I mean........ it's not like I could just let go of the metal as it was binding.
I wasn't in any danger. I was standing to the side of my fence. Worst case scenario might have been launching the 9" by 12" section of metal a few feet behind the saw. I had a plywood cap over that sheet of aluminum to eliminate the shrapnel from flying all over my face. Had I let loose of the metal and it had bound against the fence and stopped the blade, I suppose the saw motor could have been damaged from seizing.
I ended up re cutting a second time. another 1/8 inch. ......and this time I left a 1/8 gap between the blade and the plywood to prevent that small bur from digging into the plywood like before. I also proceeded three inches forward, then carefully backed the aluminum sheet
out of the cut to re-spray the blade with WD-40. (blade still moving) then forward
3 inches, then slowly backed out again, re-sprayed the blade and finished the last 3 inches of the 9 inch cut.
From what I learned, is that backing out of a cut with this aluminum sheet is at least as safe if not safer than doing it with some 3/4" plywood. Just hold the piece steady against the fence as you push and keep everything doused with WD-40..... the blade, the fence and the table top surface so the metal slides easily.
I may do an MS Paint drawing to show the procedure more clearly.
So anyhow, I got's all 4 rectangles of aluminum (aluminium for you Jon)
cut and stacked together and ready for marking the layout of the contraption.
With luck it won't look too much like a '"contraption" but more like a tool.