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Author Topic: Paint Booth with a Automotive HVAC fan -- Home made --Completed with video  (Read 1122 times)

Offline nkaltso

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I had enough of the fumes.  I have been rattle canning and air brushing for years in a enclosed place, were the solvents just get blown back through the house. 

The other day while painting a Honda Civic model the solvents really go to me.

So I am opening this thread to capture a build of my new paint booth.

Building a paint booth is tricky and I have several concerns,  They are:

  -- I don't want it to blow up.  Solvents, electricity, and motors with brushes will explode and result in a situation.
  --  I need to be careful of pressure loss in the system.  I want this thing to suck.
 --  what will the booth look like?

UP to now I have spent a lot of time picking a fan.

I looked at kitchen fans, bathroom fans and settled on two 120cfm fans from Amazon,  BUT

When I got the bathroom fans in the mail I sent them back.  Even though the motors were brushless the windings were in the air flow and this concerned me.

My brother in law mentioned why not go with a Automotive HVAC fan.  He got me one from a F-150.  Here are the specs of it.

  --  squirrel  cage with a motor out of the air stream
  --  Brushless motor
  -- 500 CFM (more power)
  --  25amp 12 volt draw
  -- requires a Pulse width modulated (PWM) signal (ugh)
  --Around $50
  -- I have to build a blower housing  (ugh again)

Today I purchased a PWM signal generator that can handle up to 30Amp.  I got it on Amazon for $30.  Motors will pull only the amperage that it needs 30 is greater then 25 amps so I'm good to go.

The single generator will also be used to control the speed.  If you want details on how it works let me know.

So this is were the journey begins.  The fan needs a housing and a booth.

I got some designing to do.

Wish me luck. I hope this info can help you.  Paint booths if done wrong can be very dangerous,  lets see what I learn.

Nick
« Last Edit: November 12, 2016, 10:51:24 pm by nkaltso »

Offline nkaltso

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Re: Paint Booth with a Automotive HVAC fan -- Home made (with pics now)
« Reply #1 on: September 05, 2016, 05:42:52 pm »
Here are the first batch of pics.

I decided to go with a Sheet metal stud construction.  Studs are much better to work with then wood.  They can also be grounded to keep the dust down.

The booth side framing is complete. the openings size is 18x 32.  Im using the same 16x25x1 filter that my furnace uses, so they are always in stock.

I plan to seal the gaps on the sides after I put the sides on.

So far so good.  next are the blower housing pics.

If you have any questions let me know

Nick

Offline nkaltso

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Re: Paint Booth with a Automotive HVAC fan -- Home made (with pics now)
« Reply #2 on: September 05, 2016, 05:52:22 pm »
Now for the blower housing. A lot of the build has been created on the fly, and so has this housing.

As written before I went with a brushless automotive fan with a motor outside of the airstream.

But I need to make a blower housing.

I started by sketching up a design for the housing on a sheet of MDF. 

Keeping with the sheet metal stud construction theme I cut a bunch of groves in the stud tray, and bent them into a circle around a roller.

Then I went back the the MDF board and screwed the housing into position.

From there I sketched up a few side plates in sheet metal and there you go.

Spinning the wheel by hand it works great through its 4 inch opening.

Next I need to work on increasing the efficiency by sealing gaps then mount it to the booth.

Nick



Offline RossW

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Re: Paint Booth with a Automotive HVAC fan -- Home made (with pics now)
« Reply #3 on: September 06, 2016, 03:42:58 pm »
I'm building my own too so I'm very interested in your design & progress. I'm using a Dayton motor that I spec'd out to be very similar to the one used in Pace's Peace Keeper Deluxe.

Great work so far!

Offline AlW

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Re: Paint Booth with a Automotive HVAC fan -- Home made (with pics now)
« Reply #4 on: September 06, 2016, 04:13:07 pm »
Nice work on this, Nick.  Looks very sturdy and large enough for most scifi builds.  Can't wait to see you put the 1/350 DeBoer's Reliant in there!

Offline nkaltso

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Re: Paint Booth with a Automotive HVAC fan -- Home made (with pics now)
« Reply #5 on: September 06, 2016, 08:48:12 pm »
I'm building my own too so I'm very interested in your design & progress. I'm using a Dayton motor that I spec'd out to be very similar to the one used in Pace's Peace Keeper Deluxe.

Great work so far!

Thanks,  I looked up the Pace Peace booth, and those are nice units.  I  wished i owned a press brake.

My booth is defiantly not that pretty but will work.  All i have is sheet metal studs to work with, so the cost will be under $100.

Im concerned with that Dayton motor.  If it has brushes it will explode when exposed to solvents.  My motor is a induction brushless motor.  I would recommend you look at a boat blower motor like this one form Jabsco

https://www.zoro.com/jabsco-blower-105-cfm-12vdcv-43a-3500-rpm-35515-0010/i/G1992697/?gclid=COiaoNyQ_M4CFQwIaQodgc4GcQ&gclsrc=aw.ds

I hope this gives you something to think about. Let me know if you have any more questions.

Nick

Offline nkaltso

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Re: Paint Booth with a Automotive HVAC fan -- Home made (with pics now)
« Reply #6 on: September 06, 2016, 08:55:01 pm »
Nice work on this, Nick.  Looks very sturdy and large enough for most scifi builds.  Can't wait to see you put the 1/350 DeBoer's Reliant in there!

My wife would kill me if I brought a DeBoers Reliant home.  ;)

At 3 feet thats a lot of model to hide.  Let a lone sqeeze into the paint booth

Nick

Offline Guns Akimbo

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Re: Paint Booth with a Automotive HVAC fan -- Home made (with pics now)
« Reply #7 on: September 06, 2016, 09:55:27 pm »

My wife would kill me if I brought a DeBoers Reliant home.  ;)

At 3 feet thats a lot of model to hide.  Let a lone sqeeze into the paint booth

Nick

Ha! Then it's good news that the Timeslip 8-footer was a limited production model...you'd need a full-size automotive spray booth and paint gun to just prime that beast!







Offline RossW

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Re: Paint Booth with a Automotive HVAC fan -- Home made (with pics now)
« Reply #8 on: September 07, 2016, 07:43:09 am »
I'm building my own too so I'm very interested in your design & progress. I'm using a Dayton motor that I spec'd out to be very similar to the one used in Pace's Peace Keeper Deluxe.

Great work so far!

Thanks,  I looked up the Pace Peace booth, and those are nice units.  I  wished i owned a press brake.

My booth is defiantly not that pretty but will work.  All i have is sheet metal studs to work with, so the cost will be under $100.

Im concerned with that Dayton motor.  If it has brushes it will explode when exposed to solvents.  My motor is a induction brushless motor.  I would recommend you look at a boat blower motor like this one form Jabsco

https://www.zoro.com/jabsco-blower-105-cfm-12vdcv-43a-3500-rpm-35515-0010/i/G1992697/?gclid=COiaoNyQ_M4CFQwIaQodgc4GcQ&gclsrc=aw.ds

I hope this gives you something to think about. Let me know if you have any more questions.

Nick

There's always more than one way to solve a problem, so Dayton motors use a shaded pole-type motor where it sits outside of the air flow and just spins the squirrel cage. Quite standard for this type of application. I've used a smaller one in my current spray booth for years now with lacquer spray bombs with no issues.

Offline nkaltso

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Re: Paint Booth with a Automotive HVAC fan -- Home made (with pics now)
« Reply #9 on: September 07, 2016, 07:58:43 pm »
My god that thing is huge

I can never find that let alone fit it in the door

Nick

Offline 0035redsea

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Re: Paint Booth with a Automotive HVAC fan -- Home made (with pics now)
« Reply #10 on: September 08, 2016, 05:13:14 am »
great spray booth
Julian redsea

Offline nkaltso

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Re: Paint Booth with a Automotive HVAC fan -- Home made (with pics now)
« Reply #11 on: September 08, 2016, 09:28:08 pm »
great spray booth

Thanks Julian,  I just got my connector to the fan but I have not done much on it.

Hopefully this weekend ill have time to button it up and start spraying.

Nick

Offline trekker9211

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Re: Paint Booth with a Automotive HVAC fan -- Home made (with pics now)
« Reply #12 on: September 12, 2016, 11:11:24 am »
Love the innovation Nick. This looks awesome!!!
Phil

Offline nkaltso

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Re: Paint Booth with a Automotive HVAC fan -- Home made (with pics now)
« Reply #13 on: September 12, 2016, 09:17:15 pm »
Love the innovation Nick. This looks awesome!!!

Thanks,  sheet metal is done and everything is sealed.

Wiring is next, I'll have pics soon

Nick

Offline nkaltso

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Re: Paint Booth with a Automotive HVAC fan -- Home made -- Completed w/ video
« Reply #14 on: November 12, 2016, 10:50:39 pm »
The booth is done and operational.  I also learned a bunch though this entire process.

Much of the hold up was getting the electric motor to work.  My old F-150 used a good ole resistor  board for controlling the speed.  Today a Pulse width modulated (PWM) signal is used.

Here in lies the problem.  Off of Amazon I purchased a PWM generator, but it could not create the proper duty cycle to tell the motor to turn on.

Then my brother inlaw referred me to a simple unit on amazon that was just a board with buttons and numbers.   it took 2 months to get here.   Once he figured out the correct frequency (100 Hz), voltage 9V, and the correct duty cycle (40-80) the motor works beautifully.

You can see how I ducted the vent out, and does this thing move air.  Im very happy with the results.

Ive had taken a few months off of the bench, but now I'm ready for the winter.

Here is the video link

https://www.youtube.com/watch?v=xGhcQqb6XtY

Thanks for following

Nick


 




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