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Old 04-04-2008, 07:10 PM
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Blasting cabinet clouds up

I have a problem with my blasting cabinet getting so filled with dust that I can't even see my workpiece. The condition is particularly bad when using Black Beauty (actually a BB clone from Menards). I am using a fairly powerful shop vac to vent the cabinet but it's not even close to keeping down the cloud of dust. Anybody built their own super powerful venting system? I'd like something more permanent than the shop vac anyhow but don't know what sort of fan might be best.

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Old 04-04-2008, 07:19 PM
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Is air allowed to get in so the vac can pull the dust out?
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Old 04-04-2008, 07:23 PM
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He should be putting air into it,every time he squeezes the trigger.
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Old 04-04-2008, 07:28 PM
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Biggest problem with shop vacs is the paper based filter inside gets clogged within 30 minutes of use. Wrap the filter with a thin layer of open cell foam like some auto filters have. Then kick the side of the vac every ten minutes or so to knock the loose grit to the bottom of the vac'. Works for me.
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Old 04-04-2008, 07:34 PM
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Quote:
Originally Posted by 123pugsy
Is air allowed to get in so the vac can pull the dust out?
Yes, there is an air inlet built into the back side of the cabinet.

Quote:
Originally Posted by BOBCRMAN
Biggest problem with shop vacs is the paper based filter inside gets clogged within 30 minutes of use.
This particular shop vac has the impeller separate from the motor...so I have the filter totally removed.
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Old 04-04-2008, 08:20 PM
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I used a twin "squirell cage" blower(the motor had a shaft on both ends).

Then I vented it at the top of the cabinet, out through a partially opened window. It worked good for a long time, but eventually that evil sand wiped out the bearings Next one will have a sandproof enclosure for the entire motor with seals on the shafts.
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Old 04-04-2008, 11:12 PM
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Put a stronger light outside the window, I use two lights

Heres a two light setup. http://www.1969supersport.com/dog5.html

Rob

http://www.1969supersport.com
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Old 04-05-2008, 12:15 AM
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Is the blasting media becoming worn out? This would be the typical cause
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Old 04-05-2008, 12:48 AM
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Try one of these:
[/url] http://www.grizzly.com/products/1-HP...ollector/G8027



i do not think you can build one for this price....

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Old 04-05-2008, 01:42 AM
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Quote:
Originally Posted by CDJr
Is the blasting media becoming worn out? This would be the typical cause
hey C boy as he said, when the blasting media wears out it will create more dust. i couldn't see sheit in my blasting cabinet with worn out glass beads and it was worse with al/ox. i moved my blasting cabinet to the outside wall of my garage and let the sunshine through the veiwing window. i can see what i'm blasting and don't have to worry about the media contaminating anything in the garage. it worked so good i now have a dedicated air line running to it. i blast away and wear one of those filter masks. i have blasted tons of parts for my C-2 project. what do i do when they predict bad weather?? i cover it with a plastic table cloth with a bungie cord (it's under the roof eaves. it's always good to go in good weather.
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Old 04-05-2008, 07:16 AM
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Quote:
Originally Posted by CDJr
Is the blasting media becoming worn out? This would be the typical cause
The dust DOES get progressively worse each trip through the blaster (I'm emptying my cabinet and refilling a pressure pot rather than using the original siphon system). But even on the very first use of fresh media there is a significant cloud which makes it quite difficult to see the work. By the 3rd or 4th trip through - you can't even see the piece when held a couple inches from the glass.

Quote:
Originally Posted by robs ss
Put a stronger light outside the window, I use two lights
I'll give that another try. That's the way I used to do it but then I installed a much brighter light inside the cabinet and I was able to see pretty good using just plain blasting sand. But now that I've switched over to the "low free silica" Black Beauty type media, the dust is much worse. So I'll give external lighting another try this morning.

Quote:
Originally Posted by techron
I moved my blasting cabinet to the outside wall of my garage and let the sunshine through the veiwing window.
You CALIFORNIA guys...hrumph. Here in northern Wisconsin I have a foot of snow around my garage walls...and it's the 5th of April. Just this week we had another 8 inches of snowfall on Tuesday. And you'd have to find me a VERY heavy parka to get me to stand outside and sandblast when it's 35* BELOW zero. I'd love to get this entire blasting setup outside to keep my shop cleaner, but I'm afraid I'm pretty well stuck with keeping my cabinet indoors.

Quote:
Originally Posted by techron
i couldn't see sheit in my blasting cabinet with worn out glass beads and it was worse with al/ox.
Shoot. That's not what I wanted to hear. I was hoping I might be able to switch over to a different media to reduce the problem...but doesn't sound like that's a workable option.

I may head out to a big box store today to see if I can find a decent dust collector like Sam suggested or some sort of gigantic fan setup that I could build.

I'm now wondering if it would help if I put TWO fans on the cabinet...one sucking the dust out and the other blowing clean air in through the inlet port. Anybody ever tried something like that?
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Old 04-05-2008, 07:22 AM
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I was going to suggest a box fan with a cowling on it to hook to the vac port, then you can set it next to a window and blow the dust straight out..

Probably not the best idea but was my first thought.
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Old 04-05-2008, 07:40 AM
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Quote:
Originally Posted by Holder350
I was going to suggest a box fan with a cowling on it to hook to the vac port, then you can set it next to a window and blow the dust straight out..

Probably not the best idea but was my first thought.
I think your assement is correct. The way box fans are built the sand and grit would be into the motor in a matter of seconds and would ruin the fan. I tried this once by taking the filter out of a shop vac that sucked the air through the motor area rather than having a separate impeller...and it toasted the vac in about 20 minutes.
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Old 04-05-2008, 08:17 AM
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I bought one of the dust collectors from TIP for my cabinet...I don't work well at all. I did change from beads to the black diamond media, and using it cut down on the dust tremendously.


Big dust collectors use a centrifugal fan, (like a squirrel cage) spinning fast. Ones that work are usually noisy.

I was going to use a squirrel cage type fan on top of my cabinet, ducting it out a window or into a cloth bag, that way the sand never gets to the motor. Media will eventually eat the impellers though. I've heard of guys coating the impellers with bedliner, but then you need a bunch of motor to swing it around.

I've killed a couple of shop vacs by hooking them to my blast cabinet.

I had borrowed one like this for a while, but it sounded like a jet taking off when it ran..



Torit is one of the older names in dust collecting, maybe find one on ebay or CL. watch out though, many industrial ones are 3 phase.




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Old 04-05-2008, 08:30 AM
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You might want to check out THIS site.

Some guy who built his own cabinet, might give you some ideas.

BTW he is using a in line fan on his exhaust system, seems to be working good.

Quote:
I realized that having the fan in the dust path would probably shorten its life but I wasn't sure how bad it would be damaged. I've been using the same fan now for over three years and it's still working.
Another idea is to stretch cheese cloth over the fan, then the dust would just fall of when it was turned off.

I better hush, now I'm wanting a blasting cabinet
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