About Nichrome Wire

Ti tube is maybe forty bucks from McMaster if your junkbox is bare.

Reminds me of the time I wrapped aluminum tubing around a long halogen tube. It was meant to be a source of hot air. The air pump I used had oily air and the halogen/exchanger would burn the oil and filled the place up with smoke.

Anyways..

Putting a halogen in the etchant flow had iffy negative points.

Yeah...Doable. Quick. Spacy cause it's glowing glass..

There's more thermal resistance compared to my custom heater design.. A halogen in a liebig will have thermal resistance's from: bulb gas mix + quartz glass + air gap + liebig glass

My heater design has thermal resistance's from:

imo..a halogen tube light is still a good contender.

I still want fast development iterations. (I fk up many times.) Examples: 'make board rev 1..trash...make another board rev 2...trash.. make rev

I do make multilayer but not with traditional vias. I'll google on how to neutralize the waste.

Sorry if your coffee tasting a bit metallic.

ha.

D from BC a écrit :

Hmmm, FeCl3 has Fe in it. Maybe (wild idea) you can induction heat it? Ask Tim W. to have a try at it...

I'll guess not as efficiently as a heating element. Ever see ferric chloride stick to a neo magnet? If my chemistry is not off then if the molecules won't get drawn to a magnetic field it's unlikely the ferric chloride molecules or iron ions can be 'jiggled' by an induction heater under 500watts. Guessing something to do with electron spin on Fe ions.

And then there's microwave heating.. :P

You neutralize the chemicals with washing soda (Na2CO3) - this turns it in to water and, essentially, dirt.

Cheers! Rich

Yeah, that's probably the easiest and maybe cheapest way- pyrex tray, nuke it (in a $39 oven that is reserved for that use) and do your thing. I've done that myself way back when. Probably work okay even if you had the PCB in there. Hmm... maybe rig up some baffle thingies and you could get the carousel to stir it for you.

Speaking of wild ideas.. Here's one I've been toying with..

To make a 'ghetto style' etching machine:

Power a rice cooker with H bridge at say.. 10Hz. This will alternate the magnetic field of the heating coil to move a encased neomagnet move for etchant agitation.

I just did an experiment by powering my rice cooker with 60VDC (my max bench supply). A neomagnet didn't move nor did a small bolt when the supply was pulsed. Bummer :( I might figure out why later.

But all that above craziness can be avoided by buying a chemistry hot plate/mag stirrer combo. Some ebay ones go for around $50

I wouldn't worry about surface area -- FeCl3 is pretty dark stuff, it'll absorb light quite nicely. That covers an entire 10% of the heat output. The rest can be covered by flow. Now, the downside is, the ends will get hot. Maybe you can backfill the seals with oil?

Tim

Mostly, but the copper is still a heavy metal, and I guess you might've been careless and dropped solder in there or something at some point.

Tim

Let's jump the track a bit. How about a standard glass heat exchanger and a hot water loop heated by a regular water heater?

Besides, over 90% of the heat capacity of any aqueous solution is the water anyway.

in

The extra $ is one thing, drastically helping with the thermal issues is another. Sometimes one relatively expensive part hugely improves product performance.

etcher.

Back when i started making a PWB was sufficient expense that i could not afford to make trash. More than one bad version would sink me and the product.

Perhaps you should transition into commercial software where repeated failures are better tolerated.

Yes, i am abnormally cranky lately, day job stress.

it

been=20

Getting solder in the enchant tank? Unlikely, no process need for them to ever come close. Even process issues that help keep them separated.

Your posts are also sucking. The last ten or so posts you've made didn't show up in the thread they belong in. And they aren't quoting automatically, I have to type the "> "'s myself.

Tim

I'm striving to make a compact, low volume etchant fountain. I believe inserting a 'heating rod' in the plumbing yields a compact design. A heat exchanger has more plumbing and therefore will required more etchant. Plus.... An element heater can be at hundreds of degrees but an exchanger is limited to about 100C. The less etchant ...the faster the warm up. The hotter the heater.. the faster the warm up..

didn't=20

Very weird. I get to see my newsreader's quoting before i post and it shows up then and there correctly. Could something else be causing it? I would like to hear how.

Works for me. Quote marks are added by the responder's reader, so something is hosed on JosephKK's system. ...Jim Thompson