= fix/WheelGrinder =

 * 2024-11 left at bus stop opposite Takanini station
   * Bad state - switch missing and all wiring lose inside housing.

== Markings / Identification ==
 * Damaged name plate on the front
   * M?215A
   * Wheel Grinder
   * LEISTUNG ? HP ?
   * VOLTS 220 / 240V
   * CYCLES 50 Hz
   * RPM 2840 ?PM
   MADE IN JIANGSU STEEL
   GRINDER FACTORY CHINA

== Chat GPT wiring suggestion looking at resistance in wiring ==
 * Assumptions is this is a 3 speed configuration

==== Best Guess - one speed ====

|| Power AC      || Connect To  || Description ||
|| brown(live)   || switch -> ( '''black''' + cap-in )|| ||
|| blue(neutral) ||<#00ff00> green      || likely main winding ||
|| green/yellow  || chassis earth point ||
|| cap-out       ||<#ff0000> red        || start winding  ||

==== Possible Three-Speed Configuration: ====

    High Speed:
        Uses the shortest path (e.g., <bgcolor=”#ff0000”>Black to Red: 17Ω) for the main winding, resulting in the highest speed.
    Medium Speed:
        Uses the intermediate path (e.g., Black to Green: 45Ω), engaging more of the winding for reduced speed.
    Low Speed:
        Uses the longest path (e.g., Green to Red: 61Ω), engaging the entire winding or adding auxiliary windings, resulting in the lowest speed.
|| Mode      || Ω  || || ||
|| Low    || 17 ||'''black'''     ||<#ff0000> red   ||
|| Medium || 45 ||'''black'''     ||<#00ff00> green ||
|| High   || 61 ||<#00ff00> green ||<#ff0000> red   ||

The capacitor would remain connected to the start winding (red) to assist in phase shift during startup, regardless of speed.

==== Three-Speed Wiring Logic: ====

A three-speed motor typically requires a switch capable of selecting different winding configurations. Here's how the connections might be arranged:

    Capacitor:
        One terminal connects to red (start winding).
        The other terminal connects to the power supply or black (main winding).

    Power Connections:
        High Speed:
            Live (Brown): Connects to black.
            Neutral (Blue): Connects to red.
        Medium Speed:
            Live (Brown): Connects to black.
            Neutral (Blue): Connects to green.
        Low Speed:
            Live (Brown): Connects to green.
            Neutral (Blue): Connects to red.

==== Three-Speed Switch: ====

To control three speeds, you’ll need a rotary switch or a selector switch with at least three positions:

  1.  Position 1: High speed (shortest path, Black to Red).
  1.  Position 2: Medium speed (intermediate path, Black to Green).
  1.  Position 3: Low speed (longest path, Green to Red).