Thread: Looking for Pim {PID } sizing information for HT oven

Originally Posted by BaronJ

I assumed that was what you meant !

A clamp amp will give you the current/wattage rating. Just add 10% for a safety margin. I would expect around 3 Kw.

2400w would be the maximum on a 10 amp circuit.

Originally Posted by Techo1

2400w would be the maximum on a 10 amp circuit.

Hi Lex, Guys,

I forget that your circuits have a ten amp rating, whilst we have 13 amp fused plugs.

Baron J

I believe I am covered as far as the capacity of the outlet because I have a couple of 10 amp outlets, as well as the 15 amp outlets, to cover lathe and and welding.

The use of the oven will be intermittent so its a matter of unplugging one machine and plugging in the other.

There is 25 KW solar on the shed so operating costs will be minimal.

Grahame

Originally Posted by Ropetangler

Apologies for the thread hijack, but do you use cyanide for colour case hardening. If so that may be hard to get unless you have mates working at a gold mine

I was going to go the ground animal products route ie bones, horns etc never though of hooves - (thanks Grahame) - I read an autobiography of exploration in the mid 1800's in South America the writer explained how to reharden his flintlock frizzen by wrapping it in animal leather, throwing it into the campfire and then retrieving it in the morning once the fire has cooled - a camp fire story ? I don't know.

Family guy,

Have a look over in our Gunsmith forum for the links to colour case hardening. I shall post some how to links.

It will make it easier to search for the future when members are seeking same information.

Grahame

Hi Graham

You can buy components and put together a controller quite cheaply if you wish - there are many youtube videos etc showing how others have done it. Inkbird controllers often seem to get a wrap but I have no real experience so can't comment.

I wanted to let you know that there is a local plug and play option supplied by AA kilns whilst I am sure not as cheap as you could DIY, there is the bonus of someone who knows what they are doing supporting the product. Just something else to think about and hope it helps.

kiln PID controllers (aakilns.com.au)

Back in post three I mentioned an add-on controller that I had. It is from AA kilns and cost me a bit over $200 in 2012 according to the invoice.
Contact details are here or as per Dangermouse's post.
DSCN9177 (Small).JPG DSCN9178 (Small).JPG
Outside is simple. The PID with a go button and an indicator light - the PID will power up but not apply heat to the element (I guess primarily to allow you to change the settings before heating) until you hit go.
DSCN9180 (Small).JPG DSCN9179 (Small).JPG
Inside shows the PID, power on relay and the SSR. I was actually glad I opened it up because there was a loose wire in there and it looked like it was slightly heated. The terminals on the SSR are spades and crimped but the terminals on the rest are screw down and should probably be crimped into a fork terminal as well rather than wire under washer.
DSCN9181 (Small).JPG
Principle of operation is simple. Plug the furnace (with it's control turned up to Max.) in the outlet on the back and plug the plug into power. The thermo couple will control power to the element, both to a set temperature as well as a rate (degrees per minute etc).

Michael

Some information. Most likely a Muffle Furnace, Selby gear was made in Melbourne, they had a repair centre on Glen Stuart road (Near Norman Turner and Nottage) Magill in Adelaide, I had my muffle furnace repaired in the 80's
They are now only a Foundation That support scientific research

Back in Jan 2022 I added a new heater bed onto my 3D printer.
https://metalworkforums.com/f319/t20...er#post1994005
The original bed was I think 250W and was firmware restricted to ~100ºC.
The new heater is 750W and controlled by an external Inkbird PID and used to heat the 3D printer glass bed getting it up to temperature a bit quicker

The Inkbird kit cost me $40
https://www.ebay.com.au/itm/32208214...Bk9SR7bQrsnmYQ
Screenshot 2023-03-31 at 6.14.34 am.png
It came with a 25A SSR, a large heat Sink for the SSR, an up to 400ºC K type thermocouple and the PID unit.
For a bit more units are available with up to 1000ºC TCs and 40A SSRs

Despite the cheap price the Inlbirds are a quality unit and have a good reputation.
I made a tempering oven (up to 400ºC) for the mens shed using one of these and my mate has used many of them on coffee machines

Originally Posted by BobL

Back in Jan 2022 I added a new heater bed onto my 3D printer.
https://metalworkforums.com/f319/t20...er#post1994005
The original bed was I think 250W and was firmware restricted to ~100ºC.
The new heater is 750W and controlled by an external Inkbird PID and used to heat the 3D printer glass bed getting it up to temperature a bit quicker

The Inkbird kit cost me $40
https://www.ebay.com.au/itm/32208214...Bk9SR7bQrsnmYQ
Screenshot 2023-03-31 at 6.14.34 am.png
It came with a 25A SSR, a large heat Sink for the SSR, an up to 400ºC K type thermocouple and the PID unit.
For a bit more units are available with up to 1000ºC TCs and 40A SSRs

Despite the cheap price the Inlbirds are a quality unit and have a good reputation.
I made a tempering oven (up to 400ºC) for the mens shed using one of these and my mate has used many of them on coffee machines

BobL

So would I be looking for, the PID unit, a 40amp SSR, a heat sink, and a 1000C Thermocouple the HD with the ceramic sleeve ?
Grahame

Originally Posted by China

Some information. Most likely a Muffle Furnace, Selby gear was made in Melbourne, they had a repair centre on Glen Stuart road (Near Norman Turner and Nottage) Magill in Adelaide, I had my muffle furnace repaired in the 80's
They are now only a Foundation That support scientific research

Thanks China,
It could be as you say.

The capacity is pretty small being an oven dimension aperture measuring 150 x 80 x 260mm.

For me thats plenty big enough for knives and even small muzzleloader lock vee springs.

Now I an curious as to what a muffle furnace does? Googled it and it seems to fit the description.

Ta muchly

Grahame

Originally Posted by Grahame Collins

BobL

So would I be looking for, the PID unit, a 40amp SSR, a heat sink, and a 1000C Thermocouple the HD with the ceramic sleeve ?
Grahame

Inkbirds will work with a K-TYPE thermocouple (~50 TO 1300ºC) - leg
https://www.ebay.com.au/itm/22229628...EAAOSwHsRYEwLK
However then you will need to supply your own ceramic sleeve.

Best this would be to buy the PID and SSR from inknird and then buy the K-type TC separately

K-type TCs in ceramic sleeves can be bought on EBay
https://www.ebay.com.au/itm/40413167...3ABFBM7uLHu-dh

My work rebuilt a heap of our furnaces and tossed all the type R thermocouples. hundreds of them!

I thought I struck gold (actually platinum) when I saw them in the skip, unfortunately the platinum wire had been recovered (and now the sparkie's driving a new car hmm...)

I did grab all the crimped stubs that were left and dissolved off the copper in nitric acid, I was able to recover a couple of grams platinum.

I also grabbed a couple of ceramic sleeves for when I build my own furnace.

IMG_2776.jpgIMG_2775.jpg