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Forum topic by Havasumatt posted 575 days ago 1294 views 2 times favorited 10 replies Add to Favorites Watch
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Havasumatt

25 posts in 953 days


575 days ago

Topic tags/keywords: shop vac dust collection thein separator question dust adaptors shopvac

looking for some help. i have a 6.5 hp shop vac i use for dust collection goin through the thein separator on top of 2 five gallon bucket i put together but the buckets imploded. so i’m about to make one for a metal trash can. since the shop vac is 2 1/2 in. hose, would it be a bad idea to use 4 in. pipe for the elbow and center pipe on the new lid for the separator? i used 2 1/2 in. for the bucket model, but that seems small to use for the trash can model. i’m still gonna use the 2 1/2 in. hose, since i have two sections already and don’t want to spend more than needed for the new model. any help would be greatly appreciated!!!!!


10 replies so far

View History's profile

History

395 posts in 582 days


#1 posted 575 days ago

Ask the people in the Thien website would probably be best. I’m done designing dust collection for people, it’s not worth my time, or the headaches. A couple of members here have made it very clear that my years of experience isn’t worth anything. Goodluck.

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Havasumatt

25 posts in 953 days


#2 posted 575 days ago

hah, nice! wasn’t asking for a design just some quick advice. glad to know there’s people in here that think there knowledge isn’t worth their time to share. thanks sawsuck!

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Bluepine38

2876 posts in 1686 days


#3 posted 575 days ago

The only reasons I can think of for using the 4” fittings would be if they were less expensive, or you were
planning on going to a 4” hose system later. You have the 2-1/2” setup, so the 4” will be an additional cost,
plus you will have to buy adapters from 4” to 2-1/2”. The 2-1/2” do look small in the metal trash can compared
to the 5 gal bucket diameter, but it should not affect the efficiency. I believe Thien suggests using same size
hose and fittings.

-- As ever, Gus-the 75 yr young apprentice carpenter

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toolie

1721 posts in 1229 days


#4 posted 575 days ago

would it be a bad idea to use 4 in. pipe for the elbow and center pipe on the new lid for the separator?

yes, for the reason’s given. and try not to let one bad apple sour you on the bushel here @ LJ. there are plenty of well intentioned WWs here who are only too happy to share their knowledge and experience.

-- there's a solution to every problem.......you just have to be willing to find it.

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Lifesaver2000

508 posts in 1713 days


#5 posted 575 days ago

I started out with a 10 gallon bucket, about 14 inch diameter with 2-1/2 inch fittings and using a similarly powered shop-vac. When I broke the bucket, I upgraded to a trash can and a top-hat type separator, with a 17 inch diameter. Since I was planning to upgrade to a 4-inch dust collector, I used four inch fittings and sized the entire separator for the larger connections.

The nice thing was, the setup worked much better than my original smaller separator even with the shop-vac, and works great with the four inch dust collector.

So, if you have any expectation of switching to four inch at some point, you can go ahead and build the collector for four inch and should not have any problem using your 2-1/2 inch shop vac with it right now. That said, if you don’t think you will ever switch to four inch, then save money and stick with the smaller fittings start to finish.

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A10GAC

189 posts in 1679 days


#6 posted 575 days ago

An inexpensive option that will save your bucket/trash can/motor, etc from imploding or burning out is a central vacuum system relief valve They’re about $12; all you have to do is intall it on the collector lid and it will open automatically and relieve the vacuum overload if the line gets blocked. Super low tech and completely automatic…it gives you time to shut off the machine you’re using, turn off the duct collection and fish out whatever is blocking the line.

A few guys on the Thein site were having problems with metal trash cans imploding and someone over there engineered a rubber & mdf version of this valve. Shortly after reading the post, I was in the garage emptying our central vac and noticed this on the inlet pipe. It was kind of a “slap myself on the forehead” moment…central vac companies have been dealing with this kind of issue long before my homemade dust collector projects.

-- Men have become the tools of their tools. - Henry David Thoreau

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Havasumatt

25 posts in 953 days


#7 posted 574 days ago

thanks guys, definitely gonna get that relief valve. you know what size it is? i might just go with 4 inch set up hoping to switch to true dust collection soon besides the shop vac

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A10GAC

189 posts in 1679 days


#8 posted 574 days ago

I believe it fits in a 2” hole.

-- Men have become the tools of their tools. - Henry David Thoreau

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Havasumatt

25 posts in 953 days


#9 posted 573 days ago

ordered that relief valve and guess goin with the 2 1/2 fittings. waitin on the dust ports to come in for the top to see what the bottom openings size at for the inlet and outlet fittings. don’t have a rockler or woodcraft around here so when i need something i have to wait for a week to play with it. i’m guessing i should have ordered a handfull of fittings for the 2 1/2in shopvac size. haven’t tried the fit on regular pvc from big box. my previous bucket version was stuff i had layin around, along with alot of caulking. not good when theres a clog! probably how it imploded.

View BBrown626's profile

BBrown626

32 posts in 562 days


#10 posted 519 days ago

The plans on Thein’s site use 4” fittings for a shop vac separator.

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