Chris Malton wrote:
> Thanks to the accidental discovery of the ratchet emulation mechanism of
> the C6C (I never bother to read the manuals!) I now have a very reliable
> elevate system.
You mean the "latched" servo mode that was specifically added for
elevate control? Those design guys at Cheap Control Systems sure are
smart ;-)
BTW: If you're using a servo for elevate control, be sure that it is
*not* directly connected to the marker/barrel assembly. Otherwise, if
the barrel hits something while the tank is moving, all of the dynamic
load will be transferred to the servo arm, which will almost certainly
break it, the servo hub or servo gears. Two good indirect mounting
approaches have been battle-tested in the Cromwell and SU-100.
The Cromwell uses a capstan approach that uses the servo to drive the
elevate axle, which takes all of the heavy shock. The servo capstan is
connected to the drive axle using fishing line, which also gives under
stress to protect the servo.
The SU-100 uses a offset cog approach in which the servo sits underneath
the marker and turns an offset cog to wedge the marker higher. The cog
itself is supported underneath, so there is no strain on the servo hub
from the barrel. Gravity and/or a weak spring pulls down on the marker
to oppose the wedge.
The Tiger is completely servo-free by using a very strong 6rpm gearhead
motor as the elevate control. Two low-amp relays drive the motor as
directed by the custom PIC controller. A cheap servo and two
micro-switches could also do the same thing from a standard receiver or
C6C. The elevate motor is so sturdy that a direct arm linkage to the
marker is possible (we know it is sturdy enough because the Navarone Gun
survived a direct full-speed hit by the Cromwell square on the barrel
and it didn't show any damage at all).
In all cases, however, the marker/barrel assembly should be precisely
balanced over the pivot point to reduce operating load on the motor and
offset springs/pistons used to reduce oscillations. These two "passive"
design elements significantly improve the performance of the elevate system.
Frank P.
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