Acquire and Install Electric Motor and Pulleys

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How to Build a Air Compressor on a Budget

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What happens here

Acquire a new 5-horsepower (HP) single-phase 230-volt electric motor. The creator opted for an EMZ motor, noting its 7/8-inch shaft, which provides better pulling power for the compressor pump compared to smaller shafts. It's crucial to select appropriate pulley sizes: a 5.5-inch pulley for the motor and a 16.5-inch pulley for the compressor pump. These sizes, along with calculations, will determine the optimal rotations per minute (RPM) for efficient 15 CFM output. Mount the motor and pulleys onto the compressor setup, ensuring proper alignment and tension for the V-groove Type A belt.

Goal: Power the compressor pump with an appropriate electric motor and ensure correct belt-driven operation.

Tools and materials

16.5-inch Pulley — To be mounted on the compressor pump
5.5-inch Pulley — To be mounted on the motor shaft
V-groove Type A Belt — To transfer power from the motor to the pump
Wrench Set — For mounting and adjusting

What they say

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jeez, how am I going to power this?" Well, the old motor that came on the compressor didn't work for me. Um, the shaft was keyed all wrong and everything. So, I ended up picking up this EMZ compressor. It's a 5 horse compressor, singlephase, 230 volts, super nice compressor, continuous duty, non-reversible, thermal protective. Shaft is 7/8, which in this kind of application, you want 7/8 over something like 5/8. You know, you want something a little bit bigger to pull. So, anyways, I got ordered this one. This was about 280 bucks. So, I had this and this. Then

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