1.
Overview
Summary
This
drawing update set (added May 2006) is used
to build a control unit for the 4-track
Zellner Yard automatic switching block.
The "new"
template Sheet 59 shown on this page,
replaces the earlier & smaller template
Sheets 9 (2 track control) & Sheet 39
(expansion from 2 to 4 tracks).
Too Many
Drawings? (Drawing Overload)
You
may find all the drawings confusing. You
could probably build a 4-track unit using
just two drawings: Drawing #59 (the
template), and Drawing #38 (track wiring).
The other
15 drawings (parts lists, dimensions, initial
operating conditions, etc) contain
information that I have had to tabulate in
the process of building my unit, and I thougt
it might be useful to document it for future
use.
When To Use
This Model 402 Template
Use
this Model 402 template if you want to build
a 4-track control unit from "scratch".
When To Use
The 1651 & 1653 Templates
If
you already have a 2-track unit built per the
Model 1651 design, then you can add the #1653
Helper Control Unit to expand from 2 tracks
to 4 tracks, as described in Section D1, 4
Track Expansion.
2.
About The Drawings
The 3 New
Drawings
There
are 3 new drawings as shown below
- Sheet
51 "Cover Sheet"
- Sheet
59 "Template For Control Unit"
- Sheet
61 "Parts List & Costs".
The Remaining
Drawings
For
the remaining drawings, use the drawings from
the previous 1654 design, as shown on web
page F3. Browse the "Cover Sheet" following
next, for a list of these drawings.
The
PDFs
Use
thee PDF (Portable Document Format) drawings
in the next Section D2, if you want to PRINT
the drawings. Note the PDF directory has the
above three new sheets 51, 59, and 61; plus
copies of all the applicable older model
1653/1654 drawings, required for a complete
drawing set.
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