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Unread 15-01-2007, 23:13
TJ4nier TJ4nier is offline
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Servo Strength

How much weight could one of the servos from this years kit hold? The part of our robot that I'm assigned to requires a servo to hold it still until told otherwise, but I'm not sure if that will work considering the size of the part compared to the servo.

But, hey, maybe it has some hidden strength deep within that teeny little black box?
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Unread 15-01-2007, 23:37
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Re: Servo Strength

http://www.servocity.com/html/hs-322...rd_deluxe.html

Says its got 51 oz/in of torque
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Unread 15-01-2007, 23:37
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Re: Servo Strength

The servos provide 42 oz-in of torque, which is relatively low compared to a high torque servo, but it still may be adequate, just depends on how much you gear it down
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Unread 15-01-2007, 23:40
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Re: Servo Strength

The servos are rated at about 40 oz-in holding torque. Not a heck of a lot. Their typical application is moving RC airplane control surfaces or steering RC car wheels.
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Unread 15-01-2007, 23:41
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Re: Servo Strength

You could have the servo hold a pin that holds the load.

We used a servo in 2004 to hold back the force or two arms on surgical tubing pivots to hang. It was difficult to pull by hand and the servo had no problem holding the pin that let them go.
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Unread 16-01-2007, 00:23
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Re: Servo Strength

Dont forget that while yes the servo may have 42 oz/in of torque, if it the piece its supporting gets jarred or knocked you will strip it out easily. I dont know if they are allowed but you can buy beefier servos with brass gears in them. Hope this helps.
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Unread 16-01-2007, 00:31
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Re: Servo Strength

Quote:
Originally Posted by amos229 View Post
Dont forget that while yes the servo may have 42 oz/in of torque, if it the piece its supporting gets jarred or knocked you will strip it out easily. I dont know if they are allowed but you can buy beefier servos with brass gears in them. Hope this helps.
Not allowed to use other servos, as far as I know.
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Unread 16-01-2007, 00:37
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Re: Servo Strength

[quote=EricH;557922]Not allowed to use other servos, as far as I know.

I was not sure, dial up is to slow to download manual
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Unread 16-01-2007, 00:38
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Re: Servo Strength

from a previous robot, don't allow servos on surfaces that can be moved by grav ity/bad humans/etc, as they WILL strip out quickly.
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Unread 16-01-2007, 11:02
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Re: Servo Strength

Quote:
Originally Posted by amos229 View Post
I was not sure, dial up is to slow to download manual
This has got to be one of the weakest excuses I have ever heard for not reading the manual.

I have dial up... Always have...

As of 2006, 44% of internet access is dial up (J.D. Power and Associates 2006 Internet Service Provider Residential Customer Satisfaction Study).

If 44% of teams did not read the manual because "all they have is dial up", FIRST would fail miserably.

JMHO.

Mike
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Unread 16-01-2007, 11:16
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Re: Servo Strength

You limited to 2 servos for the entire robot so using a servo in another postition will leave you without the pan and tilt mechanism provided in the kit. This may or maynot be acceptable for your team.
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Unread 16-01-2007, 11:19
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Re: Servo Strength

PID and encoders/pots anyone?

Can give you some help to get started if you need any... just gimme a pm/email/post.

-Q
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Unread 16-01-2007, 11:27
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Re: Servo Strength

Quote:
Originally Posted by ewankoff View Post
You limited to 2 servos for the entire robot so using a servo in another postition will leave you without the pan and tilt mechanism provided in the kit. This may or maynot be acceptable for your team.
That may have been true several years ago, but this year <R45> specifically allows additional HITEC HS-322HD Servos.

Quote:
Originally Posted by richardmcc2 View Post
The servos provide 42 oz-in of torque, which is relatively low compared to a high torque servo, but it still may be adequate, just depends on how much you gear it down
The FIRST manual used to specify that servo manufacturers typically inflate torque rating to double the actual value. So, take the 42 oz-in with a grain of salt.
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Unread 16-01-2007, 11:56
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Re: Servo Strength

Quote:
Originally Posted by ewankoff View Post
You limited to 2 servos for the entire robot so using a servo in another postition will leave you without the pan and tilt mechanism provided in the kit. This may or maynot be acceptable for your team.
Oh, really? Can you cite the specific rule that limits you to two servos?

-dave

p.s. then read <R45>.
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Unread 16-01-2007, 14:22
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Re: Servo Strength

Im sorry i was under the impression that this rule had not changed. I guess skimming some of these rules is not a good idea. Ill go back to read every single rule word for word.
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