Welcome! Log In Create A New Profile

Thermocouple

Posted by Wissing

Wissing

Thermocouple
November 07, 2013 12:26PM

Registered: 11 years ago
Posts: 62

Does anyone know what sort of chip I need to translate the millivolt signal from a thermocouple like the one found at Ultimachine, to the RAMPS board?

Reply Quote

CdnReprap

Re: Thermocouple
November 12, 2013 06:10PM

Registered: 14 years ago
Posts: 195

You could use either of these...

AD595( I think this is what ultimaker uses) [www.digikey.com] -----the AQ version is accurate enough.

or AD8495 is the new version but only available in SMT surfacemount and would need a firmware tweak.

Reply Quote

Annirak

Re: Thermocouple
November 14, 2013 03:33AM

Registered: 16 years ago
Posts: 401

I prefer the MAX31855 series. They give you an SPI interface.

Reply Quote

Wissing

Re: Thermocouple
November 22, 2013 06:39PM

Registered: 11 years ago
Posts: 62

I ended up ordering the kit from Makerbot... I don't have time to get it wrong smiling smiley

Reply Quote

Wissing

Re: Thermocouple
April 27, 2014 02:13PM

Registered: 11 years ago
Posts: 62

This AD595 with the thermocouple is working great... until I try to run the E0 motor. I can read accurate temperatures when extruding by hand, but not with the motor. I think it must be in Marlin somewhere... if it were electronic connections, I wouldn't think I'd get good readings at all.

Any ideas?

Reply Quote

metzindustries

Re: Thermocouple
September 19, 2014 10:43AM

Registered: 13 years ago
Posts: 93

It is really fussy that ad595. Mine gave me so many problems in the beginning. Stray voltage, and RF were constant headaches. Weirdest part was the stainless shielding would somehow affect readings if it touches the machine frame. Ended up cutting the thermocouple wire at 2 inches and running ordiinary wire to the thermocouple chip. Problem solved.

Reply Quote

Wissing

Re: Thermocouple
September 27, 2014 06:31PM

Registered: 11 years ago
Posts: 62

ha! well, I moved on. I ended up going back to the regular old thermistor. The extra range of temperature readings just isn't worth it. In fact, I really doubt that higher temperatures are the future of 3d printing. I'm betting it goes the other way - lower temperatures, with resins like Stratasys uses.

Reply Quote

metzindustries

Re: Thermocouple
September 28, 2014 11:27PM

Registered: 13 years ago
Posts: 93

I am getting a stand alone temperature controller today with a dry relay for the hot end. I really like how I can get high speeds out of the polycarbonate and .05mm layer heights. It is the easiest to control plastic I have used yet and has a high temp range so even with the crazy thermocouple readings I was able to print with it,.

Lets see about the stand alone controller results this evening.