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When I was doing my gear melting experiments, I used a small bead type thermocouple in contact with one of the rollers. I placed it near the end of the roller so that it wouldn't mar the contact areas. I wedged it in so that it's own springiness would hold it in place against the roller. This was good enough for my experiments, but for permanence, I would have had to find a better way. It gave reasonably repeatable readings.
BTW- My thermal controller worked great at 200C. Cannot say the same for the gears:-)
Harvey
I have a TL902 Thermal laminator with a brand name Scotch and a question along the line of thought if I may. What is the proper way to determine the temps it runs at as all the manual says is two temps one 3mil thin stock,second 5mil thicker stock? I have a MASIONE Infrared Thermometer (58 degrees to 716 degrees F). Will that be accurate when dot is ob board as soon as it can be seen coming out of lam? I am trying to figure out toner transfer and green trf transfer temps out for size before I buy a Apache ect.