| Sysop: | Amessyroom |
|---|---|
| Location: | Fayetteville, NC |
| Users: | 43 |
| Nodes: | 6 (0 / 6) |
| Uptime: | 96:06:46 |
| Calls: | 290 |
| Files: | 904 |
| Messages: | 76,426 |
I've been using my late 90's Husqvarna 350 to cut slabs from a large log, to >fit it into my sawmill. It's a high end homeowner saw, not for commercial >use, and I already damaged the plastic housing by running flat out too long >on a 90+ day. I've been idling and then stopping when the cylinder fins >exceed 350F on an IR thermometer. Does that sound reasonable, too much or
too cautious?
"Charlie+" wrote in message >news:89k19jlledmumfehiklp9jbvmhjumukecm@4ax.com...
On Thu, 11 Jul 2024 21:45:08 -0400, "Jim Wilkins" <muratlanne@gmail.com> >wrote as underneath : ...
Have you a fin painted (HT) matt black to measure on? Otherwise your
reading with IR maybe low if looking straight at Al? Running rich will
help cool it down a little .. Sorry no experience here on actual running >temps! C+
---------------------------
I also have thermocouples and a thermal imager. Generally on a heatsink the >imager shows a temperature spread greater than the error from not adjusting >for emissivity, I've left it at the default 0.98 on the IR thermometer and >drill a small hole for a K thermocouple at the indicated hottest spot in the >rare case that I need more accuracy. Typically the place damage will occur
is hidden internally anyway, so comparing IR readings to known values for >similar conditions has to be enough. On power semiconductors a base-emitter >or other diode voltage drop at or corrected to minimal current is a good >indication of actual internal device temperature.