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post #1 of 17 (permalink) Old 08-17-2013, 12:53 PM Thread Starter
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Default Dust Collector Spec's

In my first post on this forum, I asked about about making a dust collector and got really good advice - Dust Separator 101. I'm now looking to buy a container to fit with a Thien Separator. I will be using a 1 HP shop vac. A couple of questions: 1) does the size of the container make a difference, assuming that it is well-sealed? Looks like I can get a drum anywhere from 12 gal. up through 50 gal. 2) the vac hose is about 1.5 inches. With 1 HP, will it be able to draw enough to use 4" tubing? Alternatively, if I use 2" tubing, am I likely to have clogging?

Thanks for all the terrific information on the forum. I'm entering a new world here, and you are providing maps!
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post #2 of 17 (permalink) Old 08-17-2013, 03:21 PM
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Hank, since you will have to empty this drum when it is full I would tend to go smaller rather than larger. Some prefer larger so they don't have to empty it as often. Personal choice on this one.

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post #3 of 17 (permalink) Old 08-17-2013, 11:15 PM
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Quote:
Originally Posted by hankh View Post
In my first post on this forum, I asked about about making a dust collector and got really good advice - Dust Separator 101. I'm now looking to buy a container to fit with a Thien Separator. I will be using a 1 HP shop vac. A couple of questions: 1) does the size of the container make a difference, assuming that it is well-sealed? Looks like I can get a drum anywhere from 12 gal. up through 50 gal. 2) the vac hose is about 1.5 inches. With 1 HP, will it be able to draw enough to use 4" tubing? Alternatively, if I use 2" tubing, am I likely to have clogging?

Thanks for all the terrific information on the forum. I'm entering a new world here, and you are providing maps!
Hank,

Okay... (Hightlighted in red) You have my curiosity. You mentioned 1.5" vacuum hose and 1HP...

Let me explain my curiosity on that: With that small of hose then saying 1HP, I'm thinking you are referring to a shop vacuum instead of a Dust Collector.

My concern there, making it personal to me and what I have... I have a 2HP Wet Dry Shop Vac. It has 1-1/4" Hose and doesn't move much air. It does okay vacuuming through 1-1/4" vacuum attachments, hooked to a router or Miter saw, but not much else. The vacuum in inches isn't very good on it either. In fact I wonder why I still keep it around, except that it is small and portable. I can take it to jobsites.

Then I have a commercial truck mount wet/dry vacuum. It came with 2" hose. It has 2-stage impellers and pulls 105 inches of vacuum. Just about enough to suck up a bowling ball... Enough that It started to collaspe a steel 35 gallon drum when I was testing it. Motor wise it is 1.8HP. Vacuum wise, it pulls 104.6 inch W/L at 113.9 CFM. If I hook it to a 4" line, the throughout is less. Sort of like doing hydraulics and going from a small cylinder to a large... the "area" affected decreases. It does great on all things I have except my planer and my cabinet saw. This I have set up filtered on top of a 35 gallon barrel with the input hoses setup as a cyclone in the barrel... What it doesn't have in CFM, it makes up for in high vacuum pressure.

Then I have the dust collector. 2HP motor, 7-10 w/l, 1250cfm. It can do any DC needs I have. It doesn't have a lot of vacuum pressure (most DC's don't.) But it has mass airflow.

So all 3 of those say they are rated at around 2HP. There are big differences between those 3. Dust collection itslef works with the particles being suspended in the air as it travels... then separates in the cyclone or theil from centrifugal force and the decrease in air speed, causing the particles to loose suspension and separate from the air...There is actually some physics involved with that and you can tune your separator by regulating the airflow through it. Not enough or too much airflow and the separator doesn't work as well. (And yes, the separator needs to be airtight for it to work.)

So back to that curiosity- What are you using as your vacuum source? If it doesn't have a high enough vacuum pressure -or- high enough CFM, then it won't be able to suspend and carry high volumes or dust or shavings through the hose (will build up and clog).

EDIT-- Example of a disconnect in HP "ratings" for shop vacs: 20 gallon shop vac says it's rated at 6.5 peak HP. But 110volt @ 1200 watts calculates out to 1.046 HP (electrical hp).

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Last edited by MAFoElffen; 08-18-2013 at 12:09 AM.
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post #4 of 17 (permalink) Old 08-18-2013, 08:24 AM
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Default But . . . with a planer

Don't know if you've got a planer, but several years ago I quickly learned that the tank for my Shop Vac filled up really fast. With a mid-size steel garbage can, weight has rarely been a problem (but I'm only in my 70's). Also quickly learned that the Rubbermaid trash cans collapsed if I used them.
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post #5 of 17 (permalink) Old 08-18-2013, 11:34 AM
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Bob-

Good point.

I find for me, about 30 to 35 gallons is a good size. Doesn't take up a lot of room. Not really heavy (shavings). Doesn't fill up too fast.

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post #6 of 17 (permalink) Old 08-18-2013, 02:39 PM
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Default Free Drums ANYone?

Hank,

Mike (MAFoEllfen) knows about 187% more about this subject than do I. One thing that I do know about is how to get great drums (often) for FREE. Locate a chemical plant and let them know what size you need, they will almost always have a room-full of "sample drums" from Container Manufacturers or Container Distributors. Also, If a seamless plastic 55 gallon drum will work for you, check into CAR WASH services - they usually have more than they can get rid of and they often have two holes in the top that will work perfectly for your dust-collection needs. I use a lot of drums in my businesses and I do not think I have ever had to buy one! By the way - don't let the fact that plastic garbage cans have failed in your past cause you to think ALL plastic drums are wimpy! Dependant on the hazard level of the chemicals to be stored, some plastic drums can be quite HEAVY-DUTY! Also, it doesn't take ROCKET-SCIENCE to add a wheeled base for your drum - so heavy weight may become less of a concern! Good luck,
Otis Guillebeau from Auburn, Georgia

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post #7 of 17 (permalink) Old 08-18-2013, 02:41 PM
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By the way, and somewhat off-subject; did any of you know that 73.8% of all statistics are MADE-UP-ON-THE-SPOT? It's true - check for yourself!

Otis

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post #8 of 17 (permalink) Old 08-18-2013, 03:32 PM
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Originally Posted by OPG3 View Post
By the way, and somewhat off-subject; did any of you know that 73.8% of all statistics are MADE-UP-ON-THE-SPOT? It's true - check for yourself!

Otis
Only 25% of the people actually checked to see if that statistic is correct and they are the ones who noted that though the number is correct for 2012 it has increased to 74.33% in2013.

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post #10 of 17 (permalink) Old 08-18-2013, 06:49 PM
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Quote:
Originally Posted by OPG3 View Post
By the way, and somewhat off-subject; did any of you know that 73.8% of all statistics are MADE-UP-ON-THE-SPOT? It's true - check for yourself!

Otis
100% correct.......

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