The Valentine's elevate system now uses the servo saver from a Mardave Meteor
RC car to insulate the elevate servo from any shocks that the gun barrel should
encounter - assuming that the Valentine ever move under it's own steam.
pete.> Date: Sun, 16 Nov 2008 14:28:14 -0500> From: [EMAIL PROTECTED]> To:
[email protected]> Subject: [TANKS] Re: Elevate problems> > > 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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