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Also used a water brake for testing a 270 hp high speed induction motor driven by an inverter that could output 3 phase about 1000 Hz. The amount of water in the dyno was controlled to very the relationship of speed to torque.

I worked with electrical engineers designing 400 Hz 3 phase induction motors for pumps in aircraft. They had to meet a tight performance curve. They had the simplest dyno for short runs to collect data points. A pulley for a flat belt which was nylon flat strap. (what you see on a exercise...

These are the documents I have obtained for a Atlas 10 inch F size I am including the 12 inch because this is a derivative of the 10 inch I chose the Sears but I also have the Atlas similar document.

I have an atlas lathe F series. I totally modeled the lathe and it is on "grab cad" as a step file. The version of freeCad I used is older but it does come up in the latest version. Just not as friendly and each part is individually modeled and put in complete in that version. Where now it...

The Alternators in a car generator is this circuit. Which maybe a Item you could use.

Not totally surprised. The major use of induction motors that I read about decades ago was it rural India and connected to the grid.

Just crunching through the number on the first site. Not believing the power factor that I back calculated. Need a measured current at load. Not the motor must be run above synchronous by about the same speed as difference for the motor. 10 W 110 VAC .7 Amp AC 50Hz 1350 rev/min...

I am a mechanical engineer that know a single phase motor can be turned to a generator so did some searching. https://en.wikipedia.org/wiki/Induction_generator If you want to get deep into the weeds try this...

My first suspect that the Arduino is just too slow because it has to perform a lot of steps between the sparks. It is a general processor and you need a dedicated processor which the ICs you can buy for ignition.

The Greeks craftsmen created accurate patterns of holes with the simple use of a protractor. We have trigonometry calculators. Do you have a flat parking lot like a a church that isn't used for a few days. distance between two marks is twice the radius time the sine of half the angle. (180...

One simple test if you have one plate already. Use the 3D printer to make a duplicate. We do know that holes are smaller because the plastic has some width and spreads out but if it is uniform around a hole then a drill will ream the hole to the correct dimension. This is a common practice...

Don't like the drill idea that go with something you can do with a small gage solid copper wire taped to the printing head or better yet clipped to it. Then place the steel disk in a shallow tinfoil pan like for a pie. Obviously some centering feature such as a printed pin or pins. Electro...

What is the accuracy of home 3D printers? - Quora Answer: Generally, most modern consumer-grade 3D printers are capable of producing models with an accuracy of around 0.1mm to 0.2mm, which is sufficient for most hobbyist and prototyping purposes. About steel. I wouldn't use a twist drill...

The goal is to put effectively a center punch equivalent into a steel disk. Then use a drill press and a centering sharpened drill or centering drill followed by a reamer. And I would make sure the motor is well mounted so the cut is repeated.

Electro chemical etch can have close tolerances, is basically the opposite of electro plating, no harsh chemicals, not complex set up. I am thinking of thin of printing 3d on a thin plate as the electrode, tap the bottom. Then etch out the exposed metal leaving the shap of the printed plastic...

For you that have a 3D printer and think it is accurate. Mount a brush toy motor with a small drill of center point and mark up the Dividing plate. https://www.thingiverse.com/thing:4858421 Another posting is https://hackaday.io/project/174733/instructions That is for an ender and has...

For you that have a 3D printer and think it is accurate. Mount a brush toy motor with a small drill of center point and mark up the Dividing plate. https://www.thingiverse.com/thing:4858421 That is the hardware. To get the printer to move correctly is what I have been looking for...

A way to get accurate holes to make your own plate is to realize that the error is the same when for a hole that are on a 6 inch disk or A 3 yard disk. Drill a hole through the three tightly aligned. Need to match a dowel center punch and dowels for alignment. Now with a dowel in a plug...

May not find this metal strip, however; printers that use punch holes to drive the paper would work also. Not very strong but accurate. Make your own strip with this as the template. Get a punch that matches the diameter of the hole lift it off the metal and punch on a bar of metal a group of...

Sand dunes work on the principle that as air rises the entrain heavy sand drops out. So the cyclone isn't needed for removing the sand. Much of the sand will settle out where the nozzle isn't pointing. Just putting a tee with a drop out closed leg out of the box. You see the same trap used...