2019-05-06, 11:52 AM
Getting the Thermistor "In Place."
I knew I bought that metric hardware kit for something.
The heating block has a threaded hole in it. This is where the screw (that secures the thermistor) screws in.
Right next to the hole is a little divot in the heating block. This is where the thermistor head goes.
The head of the screw is supposed to be large enough to cover enough of the divot so that the thermistor head does not fall out of the divot. The screw head is not large enough.
Q3D had a novel way to keep the head in place. They routed each wire lead around opposite sides of the screw, tightened the screw down ridiculously tight, crushed the wires and damaged the thermistor.
Great job, guys!
Anyway, the solution seemed simple to me. Get an M3 washer, just like I did for the adjustment screw on the extruder. Just don't tighten the thing down, crazily. Cover the hole.
Now, I was hoping for an M3 flat washer, but I did not have one of those on hand. Instead, I checked my metric hardware kit that I bought at Rural King, a year or two ago.
The kit was still shrink wrapped. I had never used it. I SHOULD have taken it with me to work on my Toyota Radiator, as we were scrambling to find some fresh metric hardware (grrrrrr!). But, that is now all a bridge underwater.
The smallest the kit went was M4, and they did not have flat washers. They had split washers.
Strangely enough, the absolutely wrong hardware worked swimmingly. Instead of a thick flat washer, it was almost like a coil of wire. Because this "wire washer" was M4, it was actually spread out enough to cover the hole, but because it was a "wire washer" it was small enough not to cover the whole hole, and let the wire leads come out.
I would have taken pictures, but I am having problems with my smartphone right now. It is taking a long time to charge. When I get a chance, I will take some pics.
Stay tuned.
I knew I bought that metric hardware kit for something.
The heating block has a threaded hole in it. This is where the screw (that secures the thermistor) screws in.
Right next to the hole is a little divot in the heating block. This is where the thermistor head goes.
The head of the screw is supposed to be large enough to cover enough of the divot so that the thermistor head does not fall out of the divot. The screw head is not large enough.
Q3D had a novel way to keep the head in place. They routed each wire lead around opposite sides of the screw, tightened the screw down ridiculously tight, crushed the wires and damaged the thermistor.
Great job, guys!
Anyway, the solution seemed simple to me. Get an M3 washer, just like I did for the adjustment screw on the extruder. Just don't tighten the thing down, crazily. Cover the hole.
Now, I was hoping for an M3 flat washer, but I did not have one of those on hand. Instead, I checked my metric hardware kit that I bought at Rural King, a year or two ago.
The kit was still shrink wrapped. I had never used it. I SHOULD have taken it with me to work on my Toyota Radiator, as we were scrambling to find some fresh metric hardware (grrrrrr!). But, that is now all a bridge underwater.
The smallest the kit went was M4, and they did not have flat washers. They had split washers.
Strangely enough, the absolutely wrong hardware worked swimmingly. Instead of a thick flat washer, it was almost like a coil of wire. Because this "wire washer" was M4, it was actually spread out enough to cover the hole, but because it was a "wire washer" it was small enough not to cover the whole hole, and let the wire leads come out.
I would have taken pictures, but I am having problems with my smartphone right now. It is taking a long time to charge. When I get a chance, I will take some pics.
Stay tuned.
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