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Parts ordered back on Oct 18 for my test-lead fabbing venture have FINALLY arrived; as usual with Bang-em-Good, a mixed bag. Aside from the abysmal delivery time (Seriously USPS - 18 days from Rochester NY to Houston? What did I do to piss you off?), and the fact the stuff was shipped in a freaking poly film bag.... amazingly, it all arrived intact. The leadscrews are one of the last bits I'm pulling together to do a 1:4 layer height/dual Z mod on my Tevo Tornado; 600mm x 2mm pitch leadscrews to replace the single 550mm x 8mm pitch lead that came stock. Zero-Lash rod nuts, G2 sprockets and self-centering couplers arrived a couple weeks ago; now all I have to do is fab up bearings/mounts and the modding can begin.The leadscrews are actually pretty amazing quality, especially for $10 each; stainless steel with decent finish and somehow they actually arrived still straight, and very smooth with very little backlash in the included nuts. I'm not even sure I'll need the zero-lash nuts, especially for the amount of gravity preload in this application.
The Good, The Bad, and The UglyI was using this coax for some testing and noticed it seemed to be a little intermittent, so I had put it aside a few weeks ago. I don't remember where or when I got it but I've had it a long time. This evening I decided to cut it open and see what the deal was (I expected shoddy workmanship). My prediction was rewarded (yay me!). The bad crimp is shown at the top, and a proper unused new crimp connector at the bottom. After I trimmed into the plastic glob holding it all together - the cable pulled right out of the crimped connector as if no pressure at all was holding it - either the inner conductor crimp or the outer. So what do we see here? Oh yes - we have the shield crappily folded over and crimped not to an inner metal sleeve (as can be seen in the new crimp connector) - but to the plastic jacket!So beware all ye who buy cheap materials - you get what you pay for. Note: Check the label on the cable.
@bd - I've been using Silicone Self-fusing Tape to seal up outdoor connections for decades; ever since my teenage years doing DirecTV/Hughes satellite TV installs. Stuff is effing magic for sealing against weather, though the claims of it holding against pressure are greatly exaggerated. mnem*Tool-Dwagon-ily*
Do I need help?
Quote from: lazarusr on December 08, 2018, 07:55:07 pmDo I need help?Depends. Do you have a matching arbitrary generator?
Still getting the hang of that... and of getting a level coat of hairspray.
Possibly an obtuse question, but a PTC heater should have the same temperature regardless of the environment right? Providing the environment's temperature is lower. Any environmental difference should just contribute to getting to temperature quicker.
Controlled by what if anything exactly?If it is just connected to a fixed source it will provide X additional watts of heat energy to the environment or area. So higher ambient with X watts additional will yield a higher resulting temperature.
They are supposed to be intrinsically safe against getting to hot and catching fire or melting depending on how they are made or surrounded by. In effect they are just a resistor with VERY positive temperature coefficient. I would call it a safety and not a set temperature. Try this spec sheet. Wattage dropping off with increasing temperature also a curve of increasing inlet temp over outlet temps. http://www.spxtransformersolutions.com/wp-content/uploads/2017/11/PTC2-1.pdf