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Ot: Dishwashers

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tooki:

--- Quote from: madires on January 24, 2021, 03:57:39 pm ---You got strange ideas about making you own PCBs! ;) I use UV-A to transfer the PCB layout to the photoresist and sodium hydroxide for developing the photoresist afterwards.

--- End quote ---
Please use the “quote” function so we know who you’re responding to... (I assume you’re not talking to me, since I did not suggest using it for PCB developing.)

madires:
I meant you both, i.e. themadhippy and tooki.

jmelson:

--- Quote from: themadhippy on January 23, 2021, 03:49:14 pm ---

thers a uv option,so not only washing the boards but developing them to.Wonder if it can cope with etching fluid instead of water?

--- End quote ---
From bad experience, I can say there are FEW materials that can stand ferric chloride!  I built a spray etcher many years ago.  the etchant ate nylon screws that held the pump together, turned vinyl hoses into a gummy mess, and ate the magnetic coupling in the pump.  Not to mention, of course eating practically any metal except pure titanium.

Plexiglas (acrylic) was about the only thing it didn't seem to harm, whihc was what the bulk of the machine was made of.

Jon

tom66:

--- Quote from: SpecialK on January 23, 2021, 02:58:10 pm ---That Bob looks decent.  However, £349 is about $610 CAD for which I could get a decent full size machine. 

The bigger problem for North America is we only have 1875W available at the outlet unlike European's that have 3120W available.  Since you aren't getting water from the hot water faucet, you would need to heat that 3 or 4 litres from room temperature.

--- End quote ---

My Bosch dishwasher only has a 2100W heating element - that's not much more than the capacity of an American outlet.  It runs from cold water and gets to 70C.
Since the water is recycled through the machine there is little need for a powerful heating element - but a more powerful element will allow the dishwasher to get to temperature more quickly.

Regarding dish locations in a dishwasher, I read an interesting paper (only parts, this guy did his whole PhD thesis on dishwashers!) ...
https://etheses.bham.ac.uk/id/eprint/6590/9/PerezMohedano16EngD_sizereduced.pdf

Broadly speaking, it's better to load more heavily soiled dishes towards the middle of the machine.  I've been using this technique for some time.  It's not failed me yet.  The bottom rack also likely has slightly higher pressure, as the pump is not fighting gravity as much to get water up there, so I would expect the spray pressure to be a little better, so the most soiled items go on the bottom rack.

tooki:

--- Quote from: madires on January 24, 2021, 04:17:50 pm ---I meant you both, i.e. themadhippy and tooki.

--- End quote ---
|O Please explain, then, what “strange” ideas I have about PCB making, since I didn’t say anything about the topic other than the fact that UV-C isn’t appropriate for exposing resist.

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