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dekarate

Potentiometer vs Servo Rotation

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HI

I have hacked a Hitec HS-805BB (big and heavy duty servo) hoping to improve the rotation angle. I replaced the internal pot with an external that is also the axle on the gearbox. (Need even more torque 4:1 box). The original pot was 5K, so I tried a 10K pot and got about 60 degrees rotation. Then a 1K pot yielded about 110 degrees rotation. If I keep going small resistance will I get to 180 or 200 degrees? Using servo to drive arm to flip an R/C truck over when it gets inverted. 110 degrees doesn't sweep around far enough. I guess one solution would be to take out pot and put in limit switches, but that is just one more failure point. Any insight would be appreciated.

Thanks

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If you are going to add a gearbox anyway then why not add a remote pot geared to give what ever rotation you need.

Terry

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The pot is used as a true voltage divider and in this app it will not offer predictable results when you use other values. Instead, use the stock pot and add a series resistor in each outside terminal leg. Start with 2.2K's and then increase as needed.

Keep in mind that you will eventually cause a stalled servo situation, which will either break the pot, the servo stops, or damage the motor.

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See the site of servo city and your problem can be ove in a short time....www.servocity.com

Hans Delemarre, The Netherlands

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