RE: hot switches7 [TANKS]

["Doug Conn" <dwconn404-at-comcast.net>]

“Smells like …. victory.”

 

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From: tanks-admin-at-rctankcombat.com [mailto:tanks-admin-at-rctankcombat.com] On Behalf Of Chrysanthos Kanellopoulos
Sent: Sunday, February 04, 2007 2:56 PM
To: tanks-at-rctankcombat.com
Subject: Fw: hot switches7 [TANKS]

 

"Ah... teh smell of burning grease in the morning chill"

 

 

----- Original Message -----

From: Chrysanthos Kanellopoulos

To: tanks-at-rctankcombat.com

Sent: Sunday, February 04, 2007 9:49 PM

Subject: hot switches

 

Ingenious?? thanx for your good words Frank and Mike, however it was only a "cheap", basic and primitive  solution (like my successive hinges for tracks, now also on my 1:16 steel Sherman). That's a tank straight from the Junkyard Wars, scale 1:6-1:10.  The speed control does the reverse, when needed.

 

There is no interference on the servo. It runs fine and is very steady and reliable. There is a plastic shaft indeed. In fact, the metal crescent is mounted on the plastic arms of the servo. These are the parts to melt down .....

What I do is every ten minutes or so I open the hatch of teh front compartment, spray the plate with CO2, cool it down (*lots of steam), shut the hatch, and off again. I then replace the 6 AMp  battery quickly with another one. It takes about a minute to replace it.

So far (10 months after) I have not fried any motor, speed control or servo. And if I did, ah... servos are inexpensive, so... no big deal.

 

However, I promise to reduce resistance as a tribute to your forum.

 

I'll keep you posted.

 

CHrys

 

 

Ingenious indeed!

Since it only needs to allow motion in 2 directions, a U-shaped or tubular arm would
provide more contact area than a spherical ball.  The contact area could be almost
as wide as the radius of the cam, if mounted in line with the center.

Because the cam is carrying high current, I'd be concerned about insulation between
the servo and the cam.  A plastic shaft is fine, but a metal shaft or metal screw
could be a problem depending on the servo design.  A plastic hub or similar in the
middle of the cam, and perhaps a couple of plastic washers, could solve this problem.

I'd also be careful to insulate the whole thing from everything around it.  Unlike a
switch or relay, these large contacts are exposed and a catastrophic short needs to
be avoided.


Mike

---- Frank Pittelli <frank-at-rctankcombat.com> wrote:
...
>   An ingenious design that combines the servo and switch into one
> component for controlling two motors.
...