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S N A P - S H O T S  from the PROCESS of  R E S T O R A T I O N
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Due to the WOODEN BOX, the MANUS »D« came in clean conditions,
     BUT ...

  o  Carriage was not full movable to the left
  o  Arithmetic and Counter not to delete
  o  ADD/SUB Switch not working, blocked on SUB
  o  The ADD/MULT-Turn not working, blocked on ADD
  o  The ADD/MULT-Button broken

In the repair procedure came out, that some

  o  Levers were bent,
  o  Joints and sub-modules wrong or not assembled
  o  Missed part replaced wrong
     ( Horizontal needle in ADD/MULT-Turn too long )
  o  Washer under carriage FF-Cover missing
     ( Reason for frictions in carriage movement )

After a day & night work:  All functionality restored !!!

Procedure of the ADD/MULT BUTTON repair:

 (1) Made a stabilizing ring from black plastic insulator pipe
 (2) Parts are treated with 2-Component-Glue
     and folded back in position inside the ring
 (3) All filled with 2-Component-Glue
 (4) After hardening time,
     drilled the vertical & horizontal holes ...

    

The WOODEN BOX needed extra care ...

  o  Back side broken - had to be glued
  o  Missing distance piece - had to be made
  o  Locks & hinge strip rusty - WD-40 applications
  o  and after all: Wood-Oil treatment

... AND NOW:  The set is a jewel in the collection!



                                                  Status 10/24/08
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*)  P O S T S C R I P T

R E M A R K :   "It is the PURPOSE OF THE COGBAR IN THE BASE to
=============    set the carriage right for clearing arithmetic
                 unit in all positions - BUT - It doesn't work
                 for all possible conditions and positions ..."

CLEARING ARITHMETIC UNIT IN ALL POSITIONS IS A TIMING PROBLEM !!!
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Pressing the right clearing lever has to activate ...

  (1st)  The Carriage has to be shifted to the right, to
         disconnect the arithmetic unit from its input-cogwheels
  (2nd)  The reset of the arithmetic unit has to be performed

There are two critical characteristics of the COGBAR ...

  ( A )  THE SLOPE / EDGES OF THE TIPS 
  ( B )  POSITION OF THE COGBAR ( NOT ADJUSTABLE !!! )

   

With a grinder I smoothed all slopes - But more difficult:
To bring the cogbar 1 mm higher and 1 mm to the right ...

  ( a )  The horizontal pin-holes are filed oval to the left.
  ( b )  Horizontal pins are removed in order to lift the cogbar
         (Because the cogbar is hardened, filing is impossible)

  For durability, the open oval spaces beside the screws are
  filled with a piece of copper wire.

After "iterative tuning" the full functionality is now achieved !

RESULT:  The cogbar was a weak point in the design of model »D«
-------  and was discontinued in the following model »E« serie.

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© C.HAMANN   http://public.beuth-hochschule.de/~hamann   09/25/11