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Archive for February 27th, 2016

Kenmore Model 158: Older Foot Pedal Resistor

Based on the paperwork tucked into the sewing table, the most recent Kenmore Model 158 sewing machine in our stable dates to 1972, a bit earlier than the others, and has a metal-cased foot pedal with a wire-wound resistor:

Kenmore Model 158 - new-ish foot pedal resistor

Kenmore Model 158 – new-ish foot pedal resistor

The cord insulation stiffened up over the decades and I wanted to replace it, but the contacts in the sewing machine connector were spot-welded to the conductors with no room for teeny screws:

Kenmore Model 158 - new-ish foot pedal connector

Kenmore Model 158 – new-ish foot pedal connector

I blew out the fuzz, put it back together, and it works pretty well, modulo the usual low torque at slow speeds issue.

The discrete resistor taps produce a somewhat stepped response, but early reports suggest it’s not enough to be annoying; it’s much more stable than the carbon disks in the more recent pedals.

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