Hi, Mike.
May I ask what magazine you are using to supply the paper? I've heard variously catalogue pages and fashion magazines. If you'd care to share your source, it might help.
Thank you,
Donald.
----- Original Message -----
From: "Mike Phillips" <mikep_95133@...>
To: "Homebrew PCBs" <Homebrew_PCBs@yahoogroups.com>
Sent: Sunday, August 9, 2009 7:00:05 PM GMT -05:00 US/Canada Eastern
Subject: [Homebrew_PCBs] Re: Slipping rollers on new GBC H310 (and paper testing)
--- In Homebrew_PCBs@yahoogroups.com, "sailingto" <sailingto@...> wrote:
>
> Mike, Where do you have your thermocouple checking temperature? How are you reading the mV from the Thermocouple? Are you using J or K T/C?
My DVM has a temperature input using a K type T/C. So the temperature is read directly from the DVM in F or C.
>
> I am using J (that's what I had) with the ends twisted together and silver-soldered. These twisted end is captured under one of the screws that was holding one of the thermal switches (switch removed).
I slide the T/C into the output of the laminator to get most of my readings. Sliding it into the input side is about 10 degrees warmer, but the rollers grab the tc and pull it in.
>
> I have read the T/C output with a DVM, but that was off a mV at least (when measuring boiling water at sea level (100 ft elevation)). I'm now using a 50mV meter. My best transfers seem to take place around 10 to 11mV range - 360F to 390F.
>
> If you wish I can mail you a couple sheets of the magazine paper I am using - and if you wish you can mail me a couple sheets of your HP Presentation paper to try and see how our results compare?
That's fine, we can do that.
>
> Does your digital thermometer compare pretty close to the temperature from the T/C?
Yes they are within a few degrees of each other. My digital thermometer only goes to 300F. Higher than that and it will be T/C only. I think we need to make sure we are at the same temperature range first. Being off 1mv on your J T/C, is equal to being off by 20C or 68F. That implies that your range could easily overlap my range if you are off by most of 1 millivolt.
Remember, my magazine paper transfers decently. Fine traces are not a problem. So I doubt it's a temperature issue.
Have you tried any photo paper to see if it melts?
Mike