Kiln control.

[Douglas JohnstonParticipant @douglasjohnston98463]

Posted by Micky T on 16/11/2017 12:40:23:

Doug

you will need to replace the supplied thermocouple with a type K thermocouple that are available on ebay which would reach the required heat range

**LINK**

Mick

You are probably correct Micky, I just wanted to check with someone who had tried it in practice.

Doug

[mark gallimoreParticipant @markgallimore42326]

Wow – thanks for all the advice chaps – much appreciated.

The reason for powering the element from 110v is simply that I have a large reel of an unknown resistive element wire. Diameter 1.48mm. This is quite heavy duty and has too low a resistance for a small domestic furnace. It's not magnetic and hence I think it's a nichrome material. I want about 2 kw heating power and so supplying it with 110v meant I did not have to use a silly excessive length of wire. I have a 110v transformer, PID controller and both burst fire and phase angle controllers – so I have the kit – it's just finding the most sensible way to arrange it all. The most simple way was for me to use the controllers on the input to the 110v transformer since I already know they will function with 240v ac. My concern was feeding the modified waveform into the transformer and finding it caused heating losses within the transformer. Ultimately, if all else fails I'll reluctantly buy a finer gauge element.

[mark gallimoreParticipant @markgallimore42326]

I think my concern was addressed by a couple of the posters mentioning a) locating the phase / burst controllers on the output rather than the input of the transformer (I will need to check minimum working voltages) and the assymetry issue causing dc currents in the transformer.

I had considered the "cheap" E-Bay furnaces (1kg / 2kg capacity) but I read several comments suggesting the elements fail easily and you have to replace both element and central ceramic tube. I want to be running this at 1300C – at it's limit – hence my thinking of using my heavy duty wire to give it more robustness (shock resistance and longer oxidation resistance).

[not done it yetParticipant @notdoneityet]

Not totally sure, but at 1300 I think you are running in crusilite element territory.

[Brian Sweeting 2Participant @briansweeting2]

Interested to know what you will be using this kiln for, 1300°C is a lot of heat.

[not done it yetParticipant @notdoneityet]

NDIY I've responded to your message.

Neil

[mark gallimoreParticipant @markgallimore42326]

I was too slow realising my mistake….. 1100C and not 1300C – but thanks for pointing it out

[ASFParticipant @asf]

Posted by not done it yet on 16/11/2017 11:07:00:

Surely if one clicks accidentally on the ignore button there is a confirmation request before that poster is ignored?

I see no way of unblocking, if that were the case. I've never blocked anyone, to my knowledge. And usually if a post were to be blocked, the missing posts would be indicated (for continuity), even if the post were missing? Forum has some peculiar quirks, it seems.

Go to My Posts and you will see your posting My Postings and My ignored members you can then deselect an ignored member

[JasonBModerator @jasonb]

Posted by Michael Gilligan on 16/11/2017 11:31:04:

I think you can administrate blocked members via the 'Settings' menu

… but I'm on the 'bus at the moment, and one demo is enough.

You can manage ignored members by clicking "My Posts" on the top green bar

NDIY you are not ignoring any members so not sure why you can't see the posts.

[JasonBModerator @jasonb]

Posted by not done it yet on 16/11/2017 16:01:22:

NDIY I've responded to your message.

Neil

Neil, were you emulating NDIY and forgot to change back when you replied?

[Neil WyattModerator @neilwyatt]

Looks like it… and he was ignoring Douglas!

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