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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