Check out my first novel, midnight's simulacra!
Dankdryer improvements: Difference between revisions
From dankwiki
(→Models) |
No edit summary |
||
| Line 2: | Line 2: | ||
==Models== | ==Models== | ||
Rather than mounting the RC522 directly onto the bottom of the top chamber, we print a short mount for it (building the mount into the hotbox would make it very difficult to print). This reduces the heat directly transferred to the RC522, without adding new connectors. The necessary screw holes into the bottom of the chamber already exist. | * Rather than mounting the RC522 directly onto the bottom of the top chamber, we print a short mount for it (building the mount into the hotbox would make it very difficult to print). This reduces the heat directly transferred to the RC522, without adding new connectors. The necessary screw holes into the bottom of the chamber already exist. | ||
* I changed the motor mount from a rectangular to a trapezoidal prism, and then cut an inverted trapezoidal prism out from its center, reducing material costs for the cool chamber. I raised the air shield to cover the entirety of the load cell. | |||
I changed the motor mount from a rectangular to a trapezoidal prism, and then cut an inverted trapezoidal prism out from its center, reducing material costs for the cool chamber. I raised the air shield to cover the entirety of the load cell. | * I moved from a [https://en.wikipedia.org/wiki/Worm_drive worm drive] to a more efficient [https://en.wikipedia.org/wiki/Hypoid_gearboxes hypoid gear]. This reduced the choppiness of the platter rotation. | ||
I moved from a [https://en.wikipedia.org/wiki/Worm_drive worm drive] to a more efficient [https://en.wikipedia.org/wiki/Hypoid_gearboxes hypoid gear]. This reduced the choppiness of the platter rotation. | |||
==Electronics== | ==Electronics== | ||
Revision as of 07:25, 25 October 2024
In an earlier article, I designed and constructed a high-temperature filament dryer. Before I was even done putting together the first design, I was thinking of improvements for reliability, efficiency, cost, and ease of assembly. I've put some of them into effect, and the results are most pleasing.
Models
- Rather than mounting the RC522 directly onto the bottom of the top chamber, we print a short mount for it (building the mount into the hotbox would make it very difficult to print). This reduces the heat directly transferred to the RC522, without adding new connectors. The necessary screw holes into the bottom of the chamber already exist.
- I changed the motor mount from a rectangular to a trapezoidal prism, and then cut an inverted trapezoidal prism out from its center, reducing material costs for the cool chamber. I raised the air shield to cover the entirety of the load cell.
- I moved from a worm drive to a more efficient hypoid gear. This reduced the choppiness of the platter rotation.
Electronics
- Let's toss the TB6612FNG motor controller. We only need one direction of rotation, so we control the motor with an RFP30N06LE N-channel MOSFET, a 1N5817 Schottky diode, and a 10K resistor. The n-FET goes on the ground side of the motor, and the diode runs in parallel with the load (i.e. is connected to the motor's two pins). The resistor pulls down the gate lead. This eliminates four net (AIN1, AIN2, STBY, AO2, APWM go away; we add GATE) wires while adding one resistor, a net reduction of seven joints. I'm not certain that it's actually any cheaper, though; it might actually be more expensive.
- It's not easy finding a good logic level MOSFET for 3.3v! The RFP30N06LE will only pass about 20% of its rated amperage at 3.3v...but that's more than enough for our needs (the TB6612FNG could only sustain 1.2A, after all).
- The LM35 is operating in a nasty thermal environment, and on about ten centimeters of poorly-shielded AWG22. Let's give it some bigger boxing gloves. Put a 0.1µF bypass capacitor across its power and ground leads. Put a 75Ω resistor and a 0.22µF capacitor in series between the signal and the wire.
