Tag: machine stack

Welding Exercise: Strength Training Machine Weight Stack Pin

Strength training weight stack pin with an additional ring, photo 1 by Don Tai

Strength training weight stack pin with an additional ring, photo 1 by Don Tai


This is a strength training machine weight stack pin from a city gym that needed some alterations. I enlarged the hole on the handle to add a ring. The steel of the ring was from a garage door spring, so is high strength steel. I then bent the ring to allow the pin head to be threaded, bent the ring back into alignment, and then welded it shut. I used SMAW 6013 at 40 amps, but should have used 70amps.

The ring is 1/4″ 6mm thick and is not easily bent. I cut the garage door spring lengthwise, resulting in many rings, but they are slightly twisted. These then need to be bent into alignment. My welding is a work in progress, meaning I need a lot of improvement. Welding rings is interesting because you cannot get an angle grinder into the middle of the ring.