I didn’t get any pictures, or if I did, I can’t find them, but after building the work support out of 1.5″ x 1.5″ x 11ga angle iron that measures 58″ x 34″ this will give me plenty of space to clean a fender and possibly a bumper.
I started with cutting out the hopper out of 18ga sheet which I then clamped to the work support frame.
I was going to use a spring loaded trap door at the bottom of the hopper to allow me to drain it and replace the media when necessary. The trap door I’m using came from TP Tools, so I made a spacer out of some steel I had laying around and clamped it in the hopper.
I kept cutting out the 18ga sheet to make the other two sides and ended up with a decent funnel shape. When I was in high school I worked at a HVAC company where I made plenums. I sure wish I had the sheet metal brake and spot welder that I used in that shop. I then proceeded to tack weld it together.
After everything was together I moved on to fully welding the joint and grinding it smooth.
I double-checked that the trap door would fit the hopper.
When this was done, I turned it over and added seam filler to the joints. The idea is to make a box that is air tight enough that the vacuum will draw air through the inlet and not all over the place. I don’t want it leaking like a sieve. It’s not a good picture but it’s all I have from this step.