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HELP!! Need to cast or mold...need info!!!!


modelfreakca
03-13-2007, 11:58 AM
I have a RC car and i recently stripped the gear in the steering. I can`t find a gear and I tried hand cutting one from a bigger one...it lasted 1 day! (stripped again)

There are 2 gears in it and they are both the same size, so I was thinking of making a mold with the remaining one and casting the one I need. Any idea how to do it? What mold material should I use? What casting material also? The gear is in high stress as this is a high speed drift RC.


Thank you very much.


- Nick


(PS: I know I'm in the wrong forum, but I'm a model guy so it's the only place I could think of! :lol: )

MPWR
03-13-2007, 12:29 PM
Stripped a gear where in the steering? In the steering servo?

Servo manufacturers often sell replacement gears, and they tend to be pretty cheap. If it's a high stress component, home casting isn't going to be a realistic option. It would also likely be much cheaper to buy a replacement than it would be to buy casting materials.

89audiQT
03-13-2007, 12:29 PM
This may not be the way to go. You can go about casting your own, but they probably won't be strong enough to hold up if it's a running gear you're wanting to make.

Check this thread for some of the sources we use for our mold making and casting materials.
http://www.automotiveforums.com/vbulletin/showthread.php?t=680637

Here's a nice walk-through on how to use them (basically.)
http://www.automotiveforums.com/vbulletin/showthread.php?t=188447
http://www.automotiveforums.com/vbulletin/showthread.php?t=189039

modelfreakca
03-13-2007, 12:59 PM
The gear is a guiding gear....it guides a pin attached to a sensor which knows how far to straighten the wheels.

I'll post pics when I get home...I'm at school

Nick Gautreau
03-13-2007, 01:04 PM
YAY!! I finaly remembered my Username!! no more modelfreakca....lol

Nick Gautreau
03-13-2007, 02:07 PM
I have reposted with my old username....finaly remembered! lol

I have a RC car and I recently stripped the gear in the steering. I can't find a gear and I tried hand cutting one from a bigger one...it lasted 1 day! (stripped again)

There are 2 gears in it and they are both the same size, so I was thinking of making a mold with the remaining one and casting the one I need. Any idea how to do it? What mold material should I use? What casting material also? The gear is in high stress (jerks from cracks in the road) as this is a high speed RC.

The gear is 1 of 4 gears in the box; 2 gears to turn and 2 gears for the sensor to straighten out the wheels. The one stripped is a sensor gear.

I will post pics later on to show.


Thank you very much.



- Nick


(PS: I know I'm in the wrong forum, but I'm a model guy so it's the only place I could think of! :lol: )

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