Today in my shop (sanding table)

[Gene Howe]

I do have Sketchup with me. If you need further clarification give us your dimensions and I can draw up what I said.

I'm "text to plan" challenged. If you could post the Sketchup plan for a 24X24 box, I'd appreciate it a lot.

Thanks,
Gene

[paul269]

reible,

Great photos which captured some lovely Sunday weather. I was probably driving up I-294 about the time you were doing your work. Had to do a bunch of family stuff at O'Hare Airport. Saw the Aurora signs and figured you were catching every ray of sun and breath of air out there!


You could have waved when you passed me by the windmills.

[reible]

After extensive testing and playing I found out a few things about my sanding table.

I got the new peg board with the smaller holes. The performance is still not where I hoped it would be.

This is were I started to attempt some testing. First no matter how much of the table top surface I covered I could not get the vacuum to starve or at least enough to hear. That means I have a leaky system. So long as it can find a place to get air it is happy but that does little to help it work better.

I also did some testing with paper combs, those that might have worked with electronic equipment this was a common way to see where air flow is and more important isn't. I had to go to a tissue type paper to see the results. A second area of testing has to do with smoke, and no I do not mean building a fire to see what happens... remember punk sticks??? We short of a source of them I used incense, pine seemed like a good choice.

I tried a lot of things, the idea of sloped sides was a flop, that perhaps is do to the vertical space or lack of in my design. The air flow was of course best at the point over the port but was lacking the heft even there. The placing of the workpiece over the center did as I expected with better air flow right next to the work piece.

Trying to make the box air tight will take some more effort, I think some aluminum tape like they use for auto repairs and some duct work might be the ticket. A whole new way of attaching the hose is needed, the sticking it in the hole despite the taper did not work well.

So after telling you all that and doing some more looking at the system I have convinced myself that the simple solution will be to open the hole to 4" and connect to my dust collector. After reviewing several design of boxes this large I think this is for the best.

Winter is closing in so I don't know if I will have time to make the changes and test anymore until spring but for those of you waiting to see if the vacuum was going to work, well sorry that is not looking good.

Ed

[fjimp]

When I purchased the Sand Flee one thing I noted is that even with the dust collector attached most of the sanding residue ends up inside the reservoir box of the sand flee. Which really isn't all that bad as one can easily clean that reservoir out. Yes there is still some clean up around and outside of the tool. Then again the only time I don't need to clean up my shop is those days I don't use it. Jim

[mickyd]

Turbulent vs. laminar air flow is most likely going on here. May be a very difficult design problem to solve. Fluid (air) mechanics ain't easy.

[reible]

Hi, if you think of it there is no way that there is any laminar flow... all those ruff holes in the pegboard, a very short vertical depth in the cabinet, the ribbed vacuum hose... not to mention the pulse of the dust deputy. Eddy currents at every edge, nook and cranny... everywhere!

May be now is a time to invest in a way to do schliernen photography.... always love watching "air".

Ed


Turbulent vs. laminar air flow is most likely going on here. May be a very difficult design problem to solve. Fluid (air) mechanics ain't easy.

[etc92guy]

Aluminum sticky tape may be a tough go........When I built my dust collector under my table saw I used silicone caulk......That may be a little easier...