Posted 3/20/2023 17:14 (#10149704 - in reply to #10144691) Subject: RE: Looking to build a "spray table"
Just a few points to clarify in your scope of the project
1. Keep in size how mobile you want it. Makes a big difference in what you make it out out/etc, and how big it is actually size-wise.
2. How pretty do you want it?
3. Budget, usually this also ties into #1 and #2 and what materials are used, but it should be clear what you want to spend on it.
A few tips that might be helpful (in no specific order)
1. Keep in mind how far forward/back the spray is going to spray. This will set how wide your table is, AS WELL as how much room front/back.
- With this in mind, keep special attention if you plan to use any Angled nozzles, as that might have doubled how deep it needs to be.
2. Keep in mind how high you want the nozzle. Whether you are simulating a nozzle at 20" height off crop/etc, keep in mind that will change the size as well. The other thing it'll change is how much of the spray is blown back into the spray table as well. It'll kind look like drift no way about it as you are spraying pressurized water/etc into an enclosed space (at least on the sides and bottom), so it will naturally spray back up.
- To help this, I've used the filter-y kind of stuff that they make for eavestroughs to keep leaves out. Wide enough holes for spray to get in and still be cleaned up relatively well, and random enough of a pattern that spray doesn't just bounce off of it.
3. Have a bypass for pressure regulation. In such a small package, even though you think you'd be fine enough to just have a bypass back to the tank nearer to the pump, often that will cause weird things to happen, so I'd reckon you can have the bypass flowing into the bottom of the spray table. We make pressure regulator valves for estate sprayers that can serve as an example, but there'd for sure be other options for a regulator valve that'd be suitable.
4. Size your pump properly. Just when picking a pump, don't get 2x 5GPM pumps if you are going to be spraying out max 1 nozzle per pump. So, if you are spraying only 1 nozzle/pump, maybe even a 1.2 gpm pump would be enough.
5. Bear in mind pressurer gauges somewhere nice and visual. So you can actually compare apples to apples, you are probably having to make sure you are mounting your pressure gauge visual enough that you don't have to go behind it to check gauge when setting stuff.
6. Wet boom vs. Dry boom setup: While wet boom (using a fixed pipe) is common enough on sprayers, since you are only using 1 nozzle per pump/etc, it'd probably make more sense to just use a dry-boom nozzle body. Less to mount and keep level/etc. That being said, wet boom would be easier to recognize/etc. If doing wet boom, it is also kinda handy to get some clear PVC tubing for the wet boom, so you can see what's going on inside. (Can also see any built up air stuck in the boom as well)
7. Make sure your liquid storage is big enough. Depending on how you build the bottom, but you can save a ton of liquid in the battom if you build a sump in OR if you slant the bottom to a suction 90°. Especially if you are doing anything other than water.
Anyways, just a few ideas. I'll chime in if I remember anything else.
Depending on price point, we had a plastic manufacturer that forms acrylic, and it was pretty darn reasonable for them to build them for us. They can form all the angles you might need and it is clear on the sides, which is nice as well.
Think we paid like ~$250-300 for it, and that was a 24" x 48". Probably cheaper than buying stainless or something else.