ChrisNH

NHBlog-1.jpg Edit: The second part of this with the completed spray booth is here.

I have started work on a home made spray booth. I am using a 273 CFM squirrel cage blower:

http://www.grainger.com/Grainger/items/1TDR3

The structure is made with 1/2" birch plywood. I have sanded and rounded the outside edges. Before I am done I will putty them and sand again.

The booth is designed to accept 16x20x1 furnace filters. These are available for around $5 at home stores. They would be even cheaper if ordered by the case.

There is a 4" plenum behind the filter in the back. The main spray area is 20" wide, 18" deep, and 15.5" high once the roof is on.

The roof is being assembled so I can swap out glass or plexiglass windows with a light above. I figure this would make it easy to clean and also give me an option to spray directly down from above if the need arose.

NHBlog-2.jpg The close up shows how I ripped off pieces of 1/2" ply to make the rails that hold the filter. I am hoping when the blower is going the filter gets sucked back against the rail forming a seal.

The filter itself is a little smaller then 16x20. I would recommend getting the filter you plan to use before you start cutting wood.

The challenge I am facing now is finding a good way to mount the blower in the back. I didn't think that through very well. It is solvable.. my goal is to have it running next week.

I do plan to apply a coat or two of Binn I have left over from a bathroom project to seal the wood. The white will hopefully help increase the brightness in the booth, at least until it gets oversprayed. 

 NHBlog-3.jpg 

This week I have also started making a mold of the bridge abutment I would like to use. Underneath is a Chooch resin casting. I will cast it using plaster of paris which will hopefully be easy to shape into what i need.

I am using the method described in Dave Frary's scenery book to make the mold. First, I completely cleaned the piece then sprayed it with wet water. I did 4 layers, letting each dry over night. Then I did a 5th layer, put in cheese cloth, and painted it over again. I let that dry then put two more layers on, letting each dry 24 hrs.

Thats it for now. I will post some pics of how my casting goes later this week as well as any progress I make on building the spray booth. I am pretty excited to finally have that going together.

I have not made progress on my water scene. I am still pondering how I want to handle that. I may bite the bullet and tear out the facia so I can bring the level of the water up substantially.

Chris

“If you carry your childhood with you, you never become older.”           My modest progress Blog

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MarcFo45

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Chris,

I'll be watching you build your paint booth and learn from your mistakes ...  That is not a nice thought but it is the plain truth of the matter.  I received my Dayton blower from Ebay seller. I got the model yours replaced,  a 4C447 for   

You say 20 X 18 X 15.5. Box looks almost square from the front. Is that a typo ?   Looks like you have a slant to the back that may bring it to your 15.5 mesurement. 

I stand 6'5. I'm contemplating building the booth into the top section of a tall cabinet and use the lower sections  for storage. This will make for  short ducting run out thru the wall.  Since the run will be short I'm looking at making it downdraft, maybe.

Marc

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ChrisNH

That was actually the

That was actually the dimensions of the spray area.

The box itself was designed to be 24x20x16. The slant in the back was imitating commercial spray booths. Its actually 5" in the back, not 4", sorry. The filter area is 1". That leaves 18" from the filter to the front of the booth.

While I originally planned it to be 16 in high, I forgot to account for the height of the base when I put on the sides. However, I turned it to my advantage, now the top will help hold in the filter.

Right now this booth will go on my table, not very hight. However, I will evenentually make a stand on it so I can have it at a higher height that is usable when standing. I need to clear out an area first.

Good luck!

Chris

“If you carry your childhood with you, you never become older.”           My modest progress Blog

Reply 0
Bill Lane

Nice Design, Economical

I bought a commercial unit spent about $200 it's nice, I think yours will come in a lot cheaper and do the same thing. Are you going to add a light? If I may make a suggestion line the inside of your booth with white poster paper or card stock the white will brighten the inside and when it gets loaded up with paint you can remove and replace it, helps to keep the booth clean.


 

Reply 0
ChrisNH

Thanks

Thanks.. I hope the design works out once I have the blower attached.

I bought the blower for $64 shipped on ebay. I have spent about $25 on wood, plexiglass, and electrical. Another $5 for the filter The final cost should be around $100. If I was not needing to be extra frugal because of my new little family I would maybe need to consider if it was worth it.

There is still another $20-$30 to spend to do the HVAC stuff to vent out the basement window, but that would happen regardless of whether a bought the booth made or not.

Thats a good idea about the white poster board. I am planning to paint it white inside.. but installing some clips so I can quickly swap out poster board sheets would be a nifty idea. If it was steel I could just use magnets.

Chris

“If you carry your childhood with you, you never become older.”           My modest progress Blog

Reply 0
MarcFo45

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Clips or those blue stick'em gum like blobs for kids.  

Are you planning to insert the filter from the top ? thru a slot.

Marc

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ChrisNH

Yes

Yes, exactly. I am thinking a little door over the slot to help keep the seal.

Chris

“If you carry your childhood with you, you never become older.”           My modest progress Blog

Reply 0
johnP48

paint spray booth

Another cheap skate working on a paint booth.  I got my blower from Ebay too,  using Ace Hardware dryer hose ( foil version ) for duct work.  Also bought some bult filter material instead of prefab unit ( cheaper ).  Will use a couple of pieces of hardware cloth ( coarse screen ) to sandwich the media.  This allows a little more flexability in filter shape.

Mine is a little larger, holds a Rubbermaid 24" lazy susan ( I model in 1/4" scale ).

Back corners are trimmed off at 45 degrees to follow turntable, blower will mount in a corner to reduce overall depth.

Still working on lights,  planning on using compact florescents ( saves energy )  Mounting two in the top side ( shadow control ) in recessed cans or behind facia to keep booth area clear.

Love the idea of the poster board liner.  How about sanding disk adhesive to hold the poster board in place?

Current project: making Aluminte RTV molds for roofs for Intermountain AAR box cars ( no longer in production )  Have reefer,  Murphy, and Deadnaught(?),  making a mold from an Atlas 40' w/ diagonal panels.  That will be all the major types used in the steam/diesel ( post war ) period.

 

 

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ChrisNH

Lighting

I will post an image up with my next Blog post.. but I made a hole with a lip in the roof of the thing that I have a 11x14 plexiglass sheet sitting in. I will replace with glass later. I put a 100watt CFL (6500k to match the layout lights) in a 10.5"" clamp light shining through that and it seems to give really nice light. The window can be popped out any time for cleaning.

I will consider more lighting if shadows become a problem but it didnt seem to be.

Chris

“If you carry your childhood with you, you never become older.”           My modest progress Blog

Reply 0
BlueHillsCPR

What a timely thread...

since I have just begun thinking about a spray booth!  I like the idea of using the posterboard too.  Even thumbtacks would work to attach the sheets.  I'm looking forward to seeing the progress on your booth too.

 

Reply 0
TheK4Kid

paint booth

I like your paint booth. Several years ago, I had left over plywood and some other left over wood from a home improvement project, so rather than spend a lot of money on a professional booth, I made my own.

I haven't read how to post pictures on here yet, but I'll take a look at it and see if I can post a couple pictures of mine.I had an old roll around TV cart I set it on top of, and like you I bought a blower from the local Grainger dealer.I used the metallized dryer hose to an outside vent on the house I installed, and when I'm done, I can disconnect the hose, and roll the paint booth out of my way and store it off to the side of the shop.My blower sets on top of my booth and is removeable so I can store the booth easier in less space when not in use.

Mine is 24 inches deep, almost 30 inches wide, and 13 inches high, with a flourescent enclosed light under the top side of the roof of the booth. My furnace filter is in the bottom, I built like a manifold andd put apiece of pegboard for the floor of my booth so mine is a downdraft setup, but not a lot different from yours.It does a great job, and my only real expense was the blower motor and light, and filter, but it is also larger than any pro booth I looked at, so I can paint just about any hobby related item in it.

Ed

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ChrisNH

Love to see some pics

I would love to see some pics.. when I finally go to redo my workshop area I may rebuild as a downdraft booth.

 

Chris

I don't know if you saw.. but I have a post with the completed booth here

http://model-railroad-hobbyist.com/node/492

Everything got out of order when I went back and fixed all the image spacing in my blog posts.

 

“If you carry your childhood with you, you never become older.”           My modest progress Blog

Reply 0
jeffshultz

Binn?

What is Binn? It sounds like it might be some sort of low-maintenance coating, but I've never heard of it before.

Thanks!

orange70.jpg
Jeff Shultz - MRH Technical Assistant
DCC Features Matrix/My blog index
Modeling a fictional GWI shortline combining three separate areas into one freelance-ish railroad.

Reply 0
Scarpia

I think it's BIN

BIN is a primer coat material that hides imperfections and stains in the base material (read knots) from Zinsser. Great stuff, I've used it for years (really useful for when you want to paint over that 1960's & '70's paneling).

 


HO, early transition erahttp://www.garbo.org/MRRlocal time PST
On30, circa 1900  

 

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ChrisNH

Its a primer/sealer

Its a primer sealer for interior work.

http://www.homedepot.com/webapp/wcs/stores/servlet/ProductDisplay?productId=100398380

I had some left over from a bathroom project I did.

Chris

“If you carry your childhood with you, you never become older.”           My modest progress Blog

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