3-Phase Dual Trans – Pt II

So .. use whatever CAD program that works for you. Me .. I use Sketchup. The cool thing about using such a CAD program is that you have a virtual model. You can hide components as you wish and create diagrams as needed.
PinsAndBoltLocationsOnCrossbarI copied the crossarms to one side so I could get a good view of the locations for the bolts and pins.

The left side is the view from the front. These are all bolt locations .. in fact too many. The ones in the center actually have a vertical 4×4 at that location .. but it does show the center where those vertical members will go.

The right side is the same crossarms as viewed from the top. These are all pin locations (pins for insulators) except where noted.

I just placed the stripwood 4×4 below each of the diagrams and marked the locations of the holes. The bolts will be Tichy#8035 .. O scale – 3″ washer, 1.5″ sq. bolt. The pins will be Dritz “Extra-Fine Glasshead PIns” from the sewing section at WalMart .. 0.018″ dia.

HangingI copied the structure to one side and deleted everything but the poles and crossarms. I will then be able to use this to locate the cross arms on the poles.

This will be simple ‘eyeballing’ the locations and should be “good nuff” .. hopefully since that is how I will do it.

JigAt first I just taped the poles to the ‘Hanging’ diagram but quickly discovered that would not work so I created a jig. Two 1/4″ bolts, 3/8″ sq. wooden clamps and a couple of thumbscrews. The wooden clamps have a radius filed where they clamp to the poles (picked up a pack of two medium sized round files from Lowes, used for sharpening chain saw blades). This should work for both notching the poles (lower one already done on the “it didn’t work taped jig” .. and for gluing together.
finishedsorta-900Everything mounted .. just need wiring up. The large insulators on top will get the high-voltage lines at some point.