Dough Proofer Box

 My family like to buy frozen balls of pizza dough. This is a cheap way to make pizza which tastes good and can be customized. To use the frozen dough, it has to be thawed in the fridge overnight and then set out to rise at room temperature for 6 hours. But room temperature during the winter can be too cold for dough. Setting the dough on top of the DVR helps keep it warm, but I thought of a better solution.

I had a small electric cooler. It's like a tiny fridge, but uses peltier cooling. It's not very efficient and is only advertised for keeping drinks cool, not for safe food refrigeration. It has no temperature controls, just runs at full power all the time it's plugged in. I knew that it's simple to reverse peltier cooling to make a heater. Then I just needed a way to regulate the temperature. I needed a way to automatically turn it off if it gets too hot, and turn it back on if it gets too cool.

I found a thermostat that would work. It's the kind you might find on the wall to control your air conditioning or heat. It has an easy-to-read dial to set a temperature and show the current temperature. It's ridiculously large for this project, but it was on sale for only $2. I looked at the simplicity of the description and pictures on the box and incorrectly assumed it was an old school mechanical thermostat. It turned out to be a newer one, requiring a CR2450 battery plus 24 volts AC all the time.

It took some experimenting with power supplies to figure out how to get it to turn on and send signals. Then I needed to add a relay. I ordered one from Amazon, but it took longer to ship than I wanted. I finished all the other parts of mounting a project enclosure box, transformer, fuse, fan, and heat sink, then testing to make sure the thermostat measured temperatures accurately, and making sure the peltier produced heat well when run in reverse. 

I used metal strips to hold the project box onto the cooler. I also added a small board with red and green LEDs to show the status of whether the heater was on (not at correct temperature) or off (up to temperature).

I was very impatient for the relay shipment to arrive because I had finished everything else I could on this project.

Amazon Affiliate link for the relay: https://amzn.to/3qk6cpP

Finally, the relay arrived, and it took less than half an hour to install it. It worked perfectly. I haven't tested the dough proofer with dough yet, but we did use it to melt chocolate.

If you need a dough proofer, there are commercial solutions out there. Some ovens might even have a low temperature setting for this. There are probably easier ways to convert a cooler to a proofer, or at least with a smaller thermostat. But this project was good because it helped me learn about thermostats without having to spend much money.

Turning Two Broken Drills into One Working Drill

 

We had a Worx "switchdriver" that had a feature of switching quickly between two different bits by rotating the front half. This was convenient for putting a drillbit in one half and a screwdriver bit in the other, and switching back and forth quickly. Here's an Amazon Affiliate link to that drill: https://amzn.to/330y3mh

Picture from Amazon.com

Unfortunately, this drill stopped working. Griffin looked inside, but didn't want to completely take it apart until his dad figured out if it could be replaced under any type of warranty. So he put it on a shelf for about a year. When he took another look at it recently, he figured out that motor was fine but the speed controller failed.

Today, Griffin tried to use another cordless drill to help replace the handle on a garden rake. But when he started drilling, smoke came out of the motor of the cordless drill. He figured out that the motor of that Craftsman drill had burned out. 

So now Griffin had two broken drills- one with a good motor and bad controller, and another one with a good controller and bad motor. He wondered if he could combine the good parts from each to make one working drill.

At first glance, the motors looked identical. They were exactly the same size, and the gear on the motor shaft looked like it was the same size too.

 Griffin tried to fit the good motor into the other drill. First, he swapped the plastic coverplate that needed to lock onto the gearbox. 

The gearboxes did look different- one had five gears that surrounded the gear on the motor shaft, and the other had three. But that shouldn't matter if the motor shaft gear of each motor was identical. He tried and tried to get the motor to fit, but something was wrong.

Mom took a look and noticed that one gear had 11 teeth and the other had 12. Oh no! The only way to make this work would be to swap the gears from the motor shafts. Unfortunately, these gears weren't designed to come off. How frustrating!

Griffin used pliers, screwdrivers, hammers, crowbars, and a vise to pry the gear off the good motor. He got it off without damaging the motor. Next, he had to get the gear he needed off the bad motor. Unfortunately, the entire shaft came out of the motor with the gear. He was able to hammer the shaft out of the gear using a nailset. 

He transferred the correct gear to the good motor shaft, and then reattached the plastic coverplate. Success! The gears meshed together correctly and the plastic coverplate locked the gearbox on. 

Then he soldered the wires to the motor and screwed the housing back on. Success! The drill works great now. It sounds slightly rougher than it used to and the light does not work

Shoe Repair

Griffin has been walking over 10,000 steps a day as a college student on campus. This has caused him to wear out many pairs of shoes. Although the upper part of the shoes look relatively new, the soles have worn. In some pairs, the sole has cracked in half in the center. In other pairs, the heels have worn away.

Griffin decided to try repairing the newest pair to try getting more life out of them. He considered filling in the worn-away heel with hot glue, foam, wood, or rubber. Rubber seemed like a good choice (as we have seen people create soles from old tires). He finally decided to use wire insulation (probably plastic, not rubber). 

He had a scrap of 1.25" diameter wire insulation that he found on the sidewalk near a telecom box. The outside was smooth, and the inside was grooved. He flattened the wire insulation with his heat gun, and then used a pattern to cut a shape out of the plastic. Then he hot glued the plastic to the heel of the shoe. He did the same thing for the second shoe.

Now to experiment and see how long the repair will last. Which will fail first- the hot glue, the new plastic patch, or the rest of the shoe?