Rattle Spray Can Micro Spray Booth With Turntable

I can't tell you how many times I have wanted to spray something and haven't had anywhere suitable to carry out the procedure, I have taken things outside, I can't suspend them properly, there is a need to rotate the part or component, the items I am talking about are not usually big objects, invariably they are small, I need a spray booth with some sort of extraction, Lighting and a rotating turntable with adjustable speed control.

I don't have a spray gun or Air-Brush so usually its a spray paint can or rattle can as they are often called.

Looking online these spray booths are quite expensive and run up to $200 and are very basic.

So the framework will be plywood based, with a diy wireframe filter, there will be 12v LED Lighting, and there will be a turntable which I can control the rotating speed of in increments.

The turntable electronics will be an Arduino based 28BYJ stepper motor and potentiometer for speed control, LED lighting will be 12v LED strips to the sides of the spray booth.

Should be an interesting build:

Suitable pieces of scrap plywood 3mm and 12mm

Suitable filter material

Galvanised wire

Hot Glue sticks and gun.

28BYJ stepper motor

Potentiometer 10k

Arduino Uno or Nano/Servo Shield

Stepper motor adapter.

12v Led strip

On/off rocker switch

12v Power supply

2 Helping hands

The first task is to construct a plywood framework for the booth, I had a small sheet of 3mm ply and I marked this up with what I thought would be a useful size going on the projects I had previously wanted to spray.

Marking this out I had 2 angled side pieces and I wanted a base to house the electrical components etc, I cut the main components out using the table saw, once the sizes were more manageable I moved to the band saw.

I just held the components together and used Hot Glue to secure, I made the base first and then moved onto the sides, I did use an angle to ensure the plywood was plumb prior to gluing, I then cut a 12mm piece of plywood for a brace across the back of the booth top and bottom

I had a piece of 3mm ply with a good warp, I thought I would use this for the roof of the booth, the curve would look ok.

For the back of the booth I made a removable filter element which consisted of a plywood frame clamp with galvanised wire uprights to clamp the filter material, to the back of this there is a removeable plenum chamber connected to the hose of my workshop vacuum with a 3D printed adapter, this chamber will be screwed to the sides of the booth in 4 places.

This is not the best extraction but it takes away the fumes from the booth when spraying, its not like we are spraying a car or something big, and the vacuum is a fair distance away from the spraying area, a better idea would be an inline fan and extraction tube going out through the wall or something, but keeping costs down and using what we have to hand is a priority with diy.

So with the framework complete its time to work on the filter element.

So my idea with the filter is to keep it simple, I'm using 2mm Galvanised wire lengths @ 230mm vertically, these are secure to the front internal top and bottom rear plywood horizontal pieces, I guessed the distance apart for these, its not really important as long as it holds the filter in place then I will make a plywood surround with vertical galvanised wire lengths, this surround can then be secured into position using 2no hinges and a simple turn lock enabling it to trap the filter and also be removable to replace the filter, I didn't have any small hinges so I designed and made some simple 3D printed ones.

This is the beauty of Fusion360, its a Sunday, I could go out and buy a couple of hinges from a diy store but non are nearby so lets make some along with something to secure it in the closed position, it feels so much better when you have made a part or component rather than buying something.

The hinges don't have to be anything fancy, they are not seen, please take a look at the screen shots, it will give you more of an idea than me trying to explain the process, I've never made a hinge before but I know what a hinge looks like and the principal.

I make a 30mm x 14mm rectangle and work the design from that, from one of the ends create a circle, and then offset it to 2mm, then extrude it to 10mm then use the mirror tool and centre plane and mirror this for the other end, to make the other half of the hinge, I offset from the inner part of the inner hinge circle and extrude this until it sit's nicely between the 2 outer hinge parts make this a new body, from the top of the original hinge, offset this to 0.02 the project it and extrude it to the correct depth, I now need to extrude the centre part of this hinge to meet the sleeve of the hinge we made earlier, extrude to object and join, I then filleted until it looked the part, 2 screw holes per hinge half and job done, I 3D printed them which took 34 minutes and then cleaned the holes out with a 2mm drill, I used some 2mm rod for the hinge pin, cut this to length and put a dot of superglue on the ends to secure the pin.

My thinking with the electrics is to have a rotating turntable of which I can control the speed of, this will be a 28BYJ Stepper motor used in conjunction with a potentiometer, there will be 12v LED Strip which will be on plywood stand offs allowing cling film to be wrapped round to protect LED's when Spraying, there is an on/off switch, power will be provided with a 12v Power supply with a Barrel connector.

I will control the Stepper Motor via a ULN2003 driver using an Arduino Nano and Servo Shield for easy connectivity and a 10k potentiometer to control the turntable speed.

The code for the Arduino and stepper motor is just one of the examples in the Arduino built in examples.

The electrical installation will be underneath in the base and I will install switches etc to the right hand side with a plywood surround as not to get any spray paint on the switches and knob, all cables will be secured with hot glue.

The final thing to do is to put it all together:

For the Turntable I am using a piece of 4mm Ply I cut this into a circle, to secure this to the stepper motor I am using an adapter which in turn is secured to the shaft with Allen screws, I cut a hole through the base just over the diameter of the stepper motor and with the turntable secured to the stepper I drop this through the hole and then glue a length of wood to the bottom of it and made a couple of stand offs and then secure the whole thing with hot glue.

I use my dremel and a drill to create the holes for all switches etc and solder these up in situ.

I make a removable enclosed plywood surround for the rear of the booth, I can use my shop vacuum for extraction, not ideal but will take the fumes away.

Would be rude not to give this bland plywood a coat of paint and I have a spray can with matt black, its for metal but it will do.

So for not too much money we have a fully functional mini spray booth,it's not the best paint finish but I just used what I had to hand, I had all the material to build this apart from the filter material.

This booth is basically held together with Hot Glue, but its really solid, and really looks the part, its very functional and can be used indoor or outdoor.

Ideal for spraying small components, with Speed control turntable, Lighting and Extraction, I've wanted something like this for so long, cant wait to use it in earnest, why didn't I make one earlier:(

Hope you enjoyed this Instructable and see you in the next one.