The 55 Project
A Brief Survey of the Powder Measure Market After the Introduction of the
LYMAN IDEAL MODEL No. 55 POWDER MEASURE
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The  more words coming
Lyman Pistol Accumeasure  Powder Measure 1987 - 1998
180 Degree
135 Degree
225 Degree
90 Degree
270 Degree
315 Degree
45 Degree
0 Degree
Click on the thumbnails to view this measure from different angles.
Front View
The set screw on the bottom of the body releases the rotor from the body.  The brass charge cavity housing is coupled to the rotor
by means of two roll pins that precisely locate the two components relative to each other and also transmit the rotary motion from
the crank handle to the rotor/charge cavity assembly.  Each brass charge cavity numbered 10 or less has two charge cavities of
different capacities.  Then the brass charge cavity assembly is turned so the S is showing to the outside, the smaller of the two
cavities lines up with the powder flow. In the fashion when the L is facing outward, the larger of the two charge cavities is active.  
This arrangement allows one "plug" to provide two different charge settings.  In the left two photos it can be see that the charge
cavity is drilled in from different sides of the brass rotor at different locations along the longitudinal axis.   The same rotor is
shown in both the two left hand photos.  Charge cavities from 11 through 15 have but one charge cavity because the size
precluded drilling two without interference.
Product Packaging Details
The basic input and output system of the body, shown without
hopper.  The screw seen in the right photo secures and
releases the rotor assembly into the body.
The 12 rotor assortment sold sometime later after
the introduction of the measure in the plastic box
shown above.  The box was also sold separately
The full set of rotors are shown above.   Sizes 1 through 10
provided two charge cavities each and rotors 11 through
15 provide one charge cavity each.  A total of 25 individual
charge settings were obtained.
Two anomalies shown above for the trivia buffs.  The
number 6S rotor was stamped both with the standard
"Number-Letter" and assumed the user with know that
the number preceded the letter knowing it was not a "9".  
It was also produced with an underscore on the "6" to
differentiate it from a "9".  The second anomaly is the
Number 11 rotor with the "X" marked over the "L",
probably the result of a shop screw up.
                Measure
Year      +3 Rotor      12 Rotor     Single      Measure
                Kit                Kit            Rotor         Alone
                         
1987        $24.94        $49.95        $5.95        $19.95
1988        $28.95        $49.95        $5.95        $19.95
1989        $29.95        $49.95        $7.00        $19.95
1990        $31.95        $49.95        $7.00        $21.00
1991        $32.95        $49.95        $7.00        $22.00
1992        $32.95        $49.95        $7.95        
1993        $33.95        $49.95        $8.25        
1994        $22.95        $44.00        $7.25        
1995        $33.95        $46.00        $7.25        
1996        $35.00        $46.00        $7.25        
1997        $35.00        $46.00        $7.25        
1998        $35.00        $46.00        $7.25        
Price History taken from Lyman Catalogs.  Note the reduction in 1994
and the subsequent restoral.  Wonder what was going on there.  The
measure alone was not offered after 1991.  This measure was not
listed in the 1999 catalog nor was it seen again.
March 1987 Chart of Rotor Charge Weights
for selected powders
March 1987 Instructions and Illustrated Parts Breakdown for the Accumeasure.   This single bi-fold sheet, printed
both sides was supplied with the measure.