In building the Ivatt Class 2 I came across the problem of attaching the slide bars to the motion bracket. I wanted some way for the slide bars to be easily separated from the motion bracket rather than soldering the slide-bars to the motion bracket so that I could separate the components into their individual elements.

This was my solution – dove tail joints at the end of the slide bars.

Slide bars

The slide bars are made using mild steel to give them the right colour, rectangular bar stock was milled to give an L shape of the correct dimensions. The last 1/16″ of the slide bar has a small bevel filed at the end.

Motion bracket

For the motion bracket I then got a small length of steel bar and filed it to a H section. The top section of the H was then carefully under cut using a triangular needle file so that it would fit the bevel on the slide bars.

Slide bar and motion bracket

The H section was placed on the slide bars with the cross head fitted to ensure the correct spacing. The H section was then carefully sweated to the motion bracket.

Ivatt 2 motion

The finished result – no screws, no soldering yet easy to separate.