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Ptychodus04

Water Trap Dust Collector

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aerogrower

Can you dehydrate and reuse the medium, or just toss it?

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Ptychodus04
1 hour ago, aerogrower said:

Can you dehydrate and reuse the medium, or just toss it?

 

You should be able to recover the medium. Most will remain in your blast cabinet, this just clears the air by collecting the fines. 

 

My use of abrasion is rather limited (I prefer to scribe as much as possible) so I don’t bother trying to save spent abrasive.

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Phevo

Thanks for the plans of the collector, I don't have a micro blaster yet but one day this will hopefully come in handy ;)

 

I have one question regarding the depth of tubing comming from the cabinet, if I understood correctly then it goes down to just about 50mm above the bottom of the bucket, so while the vacuum is running the air from the cabinet is forced through the water, bubbles up and is then sucked out with the vacuum cleaner ?

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Ptychodus04
21 hours ago, Phevo said:

Thanks for the plans of the collector, I don't have a micro blaster yet but one day this will hopefully come in handy ;)

 

I have one question regarding the depth of tubing comming from the cabinet, if I understood correctly then it goes down to just about 50mm above the bottom of the bucket, so while the vacuum is running the air from the cabinet is forced through the water, bubbles up and is then sucked out with the vacuum cleaner ?

 

The lengthe of the pipe is dependent on the amount of water you want to keep in the collector. You want to pipe to be a centimeter or so above the surface. You are significantly increasing the velocity of the air by necking the inlet from the 2.5” vac hose to 1.25” pipe. This forces the dust particles to make significant contact with the water, thus trapping the particles before they are drawn out of the top.

 

This is functionally different than a water bong where the tube is submerged and the dirty air bubbles up. This design requires a container stronger than a paint bucket as the suction of the shop vac can crush the weak walls of the bucket before the air can bubble up.

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Phevo
3 hours ago, Ptychodus04 said:

 

The lengthe of the pipe is dependent on the amount of water you want to keep in the collector. You want to pipe to be a centimeter or so above the surface. You are significantly increasing the velocity of the air by necking the inlet from the 2.5” vac hose to 1.25” pipe. This forces the dust particles to make significant contact with the water, thus trapping the particles before they are drawn out of the top.

 

This is functionally different than a water bong where the tube is submerged and the dirty air bubbles up. This design requires a container stronger than a paint bucket as the suction of the shop vac can crush the weak walls of the bucket before the air can bubble up.

 

Thank you for the clarification

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Ptychodus04

:1-SlapHands_zpsbb015b76: You’re welcome. FYI, this is a general fine dust collector.  It does not have to go on a cabinet to work. You can simply lay it next to the material you are working on and it will pick up the fine dust. 

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Ptychodus04

Update: My heavy duty Rigid shop vac was causing me grief with this setup. The suction is so strong that the water was getting pushed so hard by the air coming from the dip tube that it was getting sucked out the top and into the shop vac. Thus, defeating the purpose of the water trap. 

 

A simple fix fix took care of this problem. I cut the top off another 5 gallon bucket, cut a hole for the dip tube and drilled a bunch of small holes on the opposite side. This goes into the bucket and allows the water to splash around below without getting picked up by the suction of the shop vac.

 

The eye bolt allows me to lift the piece out to dump the mud that collects.

3282D896-1337-451A-AB31-EB17CEBCA81D.thumb.jpeg.f974236d229d00c81acb46617f839199.jpeg

 

 

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Ptychodus04

Addition as installed.

 

782EF3F6-8581-466A-85C6-E29DEBBEDC4F.thumb.jpeg.0b621c93bb71d61c49f97afbf13e9442.jpeg

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Ptychodus04

I now have around 5 hours of dust collection using the modified trap and have not found any water getting pulled into the vac. I would label this a success.

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jpc

My one question is as follows:  Can you run a shop vac for an evening's wort of dust collection, or will that burn out the motor?  Also, this sounds like it is quite loud.  Get it!?... Sounds Like.. Loud...   

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steelhead9
2 hours ago, jpc said:

My one question is as follows:  Can you run a shop vac for an evening's wort of dust collection, or will that burn out the motor?  Also, this sounds like it is quite loud.  Get it!?... Sounds Like.. Loud...   

Ha ha! They definitely sound loud. I used to use a shop vac before I got a "real" dust collector. I found they would normally last about 6 months of heavy use.

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Sagebrush Steve
On 11/2/2017 at 5:05 PM, Ptychodus04 said:

Cut 2 holes in the lid and assemble the threaded adapters. Silicone in place.

 

cut short piece of pipe so there’s about 2” of air at bottom of bucket when assembled. Connect 90 to ship vac. Connect straight coupling to extra hose using hose clamps. 

 

Add water ti bucket until just just below draw tube. 

 

Now, you can collect all the fine dust from preparation without burning up your ship vac. Total cost around $40 USD.

 

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Let me make sure I get this right.  The piece of pipe that extends down into the bucket is connected to the straight coupler that goes to the hose extension, not the 90 degree coupler that goes to the vacuum, right?  Or do I have that backwards?

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Ptychodus04
1 hour ago, Sagebrush Steve said:

Let me make sure I get this right.  The piece of pipe that extends down into the bucket is connected to the straight coupler that goes to the hose extension, not the 90 degree coupler that goes to the vacuum, right?  Or do I have that backwards?

That’s right. The straight one connects to the dip tube and the 90 connects to the shop vac. You can do it the other way, or even do both 90s or both straight. Just make sure the hose from your blast cabinet connects to the pipe with the dip tube and the shop vac connects to the one without it.

 

I chose the different types more so I don’t accidentally hook it up backwards while distracted. If you hook the shop vac to the dip tube side, you’re guaranteed to suck all the water out, even with the modified design I just made.

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Ptychodus04
8 hours ago, jpc said:

My one question is as follows:  Can you run a shop vac for an evening's wort of dust collection, or will that burn out the motor?  Also, this sounds like it is quite loud.  Get it!?... Sounds Like.. Loud...   

I have a heavy duty Rigid vac that is “quieter” than most. I think it’s somewhere around 75-80 dB. Still loud but nothing compared to a standard shop vacs at around 100 dB.

 

If you trap the fines, the shop vac will last much longer than if you don’t as they are what burns up the motor.

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