Straif is a canadian cliche

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WhatIsOurLimits
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Re: Straif is a canadian cliche

Post by WhatIsOurLimits »

You should come down to NC some time Straif xD
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Straif
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Re: Straif is a canadian cliche

Post by Straif »

Will do buddy, need to organize something for 2017.

Straif
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Re: Straif is a canadian cliche

Post by Straif »

Blood for the blood god, shells for the shell throne. Terrifying done Washington!
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Straif
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Re: Straif is a canadian cliche

Post by Straif »

So this happened!!! Thank-you Oregon folk for the meet up!
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Dark 2016 meet up
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xXSniperXx
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Re: Straif is a canadian cliche

Post by xXSniperXx »

It was a kick... the time pasted by to quick. It was lots of fun. And I look forward to future hang outs.
:cheers:

Straif
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Re: Straif is a canadian cliche

Post by Straif »

Vancouver island? Nailed it!
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Straif
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Re: Straif is a canadian cliche

Post by Straif »

Work related problem. I built this steam-generator for bending wood, but I keep burning out my hot water heater coils. I need a way to keep the coil from overheating while it boils water. If anyone has a redesign/added electric component I would appreciate your advice.
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WeaselSqueezer
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Re: Straif is a canadian cliche

Post by WeaselSqueezer »

Two, no three ways I can think of...

First way, easiest and most expensive while having an industrial touch and just enough showbiz bling:
Circuit Specialists 16VA520T20 Variac Variable Transformer, 20 Amp, 2000VA Max, 0-130V Output
https://www.amazon.com/dp/B006NG9OTI?psc=1
It will also burn out the first time you turn it on with the wiper anywhere except endstop. But maybe not. Devils in the details.

Next, a cheap motor speed controller available at the local dope plant hydroponics store might work, like this one:
https://www.amazon.com/MLCS-9410-20-Amp ... 001NIK6PC/
They're made for dirty switching inductive loads like electric motors, but the simple resistive heater element might be okay.
--> these things are $50 on the shelf at the right store and I suspect it will work *IF* and ONLY IF the amperage rating is a *FULL* 20A. No lying to yourself, this is a very easy way to turn cash into blue smoke.

Most esoteric, persnicketiest, *and* riskiest on the budget solution: Modulate the power to the element using a microcontroller produced control pulse into a solid state relay...

Digikey (digikey.com) has zero-crossing solid state relays, devices that handle 1500 watts (!) are going to cost some money. A solid state relay is like a regular relay but doesn't actually have mechanical contacts, just uses transistors inside. They can handle AC and/or DC per ratings, and the amperage rating is generally tied to the cost, 20 amps is gonna be a little pricey. Zero-crossing SSRs can change state in "Max. 1/2 cycle of voltage sine wave + 1ms", or in other words, plenty of time for you to switch a heater on and off multiple times a second. This ( http://www.digikey.com/product-detail/e ... -ND/307696 ) is a solid state relay that looks like it could handle that element. It's the cheapest of the list, so they start around $30 USD and go up.

That's a little depressing, as it will also need heat sinking (it is inherently an inefficient device) which may also include forced air cooling with a small fan. An old style electromechanical magnetic coil relay *can* be used, but the contacts and ratings of the relay will specify a lifetime, you're only gonna get a half million clicks or so, and it's gonna do this as fast as it can, like CLICK CLICK CLICK CLICK all the time and that is gonna GET on your NERVES, it makes the cost of the SSR seem reasonable really fast.

So using a variable dwell PWM signal with a minimum on/off time, we can adjust for the type of relay used. You don't want to sit there touching the stupid wires together yourself, so we need a small microcontroller to do that, and that can be just about anything from an Arduino Atmel chip to a five dollar Raspberry Pi Zero.

So... Big honking relay thing bolted to something cold, controller, and twistknob button something you can use to adjust the power up and down. If you use the Raspberry Pi option, you can have a bloody iPhone app that lets you adjust your steamer temp with it, but hey, I'm not writing that.

Now here's the funny part...

I just designed a circuit more or less to do this exact task. It features a Cypress PSoC uController driving a 20A relay with a 5V USB power source, a thumbnail sized OLED display, four silly tactile switches for program config, and a thermocouple input. I got 32K of flash EPROM that will hold about 6 pages of 'C' code which isn't written yet. I got PC boards for it last Friday DHL Hong Kong. I'll post pics when I cook it up, maybe today. I was gonna use it to control an oven for PC board manufacture :-)
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Re: Straif is a canadian cliche

Post by Straif »

Thanks for your time to respond Weasel. I will follow up on the second option and will post pics.

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WeaselSqueezer
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Re: Straif is a canadian cliche

Post by WeaselSqueezer »

Testing my take on the third option...
test_oven_thermo_bic.jpg
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I might have to get a better thermocouple calibration instrument than a Bic lighter.
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Straif
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Re: Straif is a canadian cliche

Post by Straif »

Damn,!

Straif
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Re: Straif is a canadian cliche

Post by Straif »

Tried the 2nd option, as we discussed. Seems to work, much less heat and more consistent. Unfortunately, I think I used the wrong type of pipes because I have way too much sediment. Suspecting the sediment is damaging the heating elements.
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WeaselSqueezer
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Re: Straif is a canadian cliche

Post by WeaselSqueezer »

That is exactly the model I was hoping you could get. That's great news!
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Straif
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Re: Straif is a canadian cliche

Post by Straif »

refinishing my wife's boat. First photo before spar varnish. Second after. 50/50 blend of Epifane's clear varinish, with their thinner.

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