| Original
Year |
1977 |
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| Parts and Construction |
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| Alternate Model(s) |
Implements, Saw, Punch Press |
| Back to Main Model |
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851/952 Additional Information |
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Parts and Construction
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Parts and
Instructions
This model contains 315 parts (pictured). Most are standard
plates and a few bricks. At upper left are the Technic beams and
the axles and gears have also been separated.My instructions from 1977 were printed in poster form. The main instructions are one big foldout sheet with 25 steps, and the alternate model instructions are another sheet which also shows "blueprints" of the main model. There are no parts lists for each step like you would expect from Technic. Later editions of this set would have a conventional instruction booklet with individual step parts lists. There are also photos of how to motorize both the main and alternate models with the optional 4.5V 870 Motor. Like all Expert Builder sets, this model also came with a booklet showing many ideas of how to make alternate models by combining the parts of this set with other sets |
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Construction
The following images show the construction at intermediate stages.The first image shows the steering assembly. The second image shows the begining of the chassis with the gears for the PTO. |
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Alternate Model(s)
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Implements
Instructions were included for 4 additional implements for the rear of
the tractor. The first 3 do not have any moving parts, while the
4th rotates as the tractor is driven. |
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Saw
This saw reciprocates as the crank is turned. Not exactly
stunning, but a good example of the kinds of simple machines which can
be built from these parts with minimal effort. It uses 3:1 gear
reduction and one of the offset holes in the 40 tooth gear. |
 Click to see an animation of the saw in motion. |
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Punch Press
I am only guessing that this is a punch press since it is very
difficult to tell. In any case, the fairly complex motion
combines the rotation of the punch with the translation of the table
and is mesmerizing to watch. The offset holes in the 40 tooth
gear are used with linkages to control the motion. |
 Click to see an animation of the press in motion. |
