Hi All, For those who haven't already discovered this fact, the
motors and motor mounts used in player grands with the Duo-Art system
are far from uniform.
Until the past couple of weeks, I never had a reason to note any
particular differences between the motors and motor mounts in
'Duo-Art grands' (grand player pianos fitted with the Duo-Art
reproducing player mechanism). All of the ones I've worked on or
rebuilt had their own motor and motor mount. So, I never had
occasion to look for a replacement motor or motor mount.
Now that I've been 'on the hunt', I've discovered that the company
used a number of different motor manufacturers and the motor mounts are
also different. However, it also seems that the primary dimensions of
the motors are basically the same. In other words, they are the same
diameter, the same length and the specifications are almost identical.
On the other hand, the motor mounts vary in length and width, and the
way the motor is secured to the mount also varies. Furthermore, some
of the mounts have hooks that are used to connect the mount to the
rotary pump while others are screwed to the pump via pieces of flat
steel. Making matters more complicated, the distance between hooks
varies by as much as an inch.
The only thing I can figure out is that the various size difference in
the motor mounts probably corresponds with differences in the size of
the piano, i.e. smaller mounts in smaller pianos, and larger mounts in
larger pianos. But that's just a guess. I've made no attempt to find
out whether this is a fact.
If someone has more information about all these differences, I would
appreciate hearing from you either privately or via the Digest.
John A Tuttle
Brick, New Jersey, USA