parts

bitternboy · Post by **bitternboy** » Wed Feb 09, 2011 3:57 pm

Thanks

Andrew_Hibberd · Post by **Andrew_Hibberd** » Wed Feb 09, 2011 7:51 pm

I am curious as to what you are planning for this servo, is it not too small for a feather?

bitternboy · Post by **bitternboy** » Wed Feb 09, 2011 8:50 pm

I was planning on using two to power a simple gripping claw. The description of the servo doesn't mention metal gears so I'm pretty sure it has plastic ones, I therefore figured the claw should look a bit like this...
http://i883.photobucket.com/albums/ac35 ... edclaw.png
...so as to be flexible and prevent the motor stalling.

Jonny · Post by **Jonny** » Wed Feb 09, 2011 8:58 pm

why not just get a couple of torqier metal geared servo's for cheaper

bitternboy · Post by **bitternboy** » Wed Feb 09, 2011 9:09 pm

I haven't managed to find a metal geared servo for less than ?15 with more than 10kg/cm torque.

terminaldamage · Post by **terminaldamage** » Wed Feb 09, 2011 9:15 pm

To be frank, that setup won't cut the mustard in a featherweight robot and will be hugely ineffective in battle. Even with two servos, the claw won't have enough power to hold another robot let alone crush one. You'd be much better off using a commercial linear actuator unit or home-made threaded rod/cordless drill combo actuator. For the ?30 it would cost to get two of those servos, you could pick up a decent actuator on eBay.

I don't want to dampen your spirits or discourage you from building a featherweight but using servos as weapons in this weight class simply won't work. The new beetleweight class is probably the last weight class where you can use servos before you have to start thinking about something bigger and more powerful.

Jonny · Post by **Jonny** » Wed Feb 09, 2011 9:26 pm

i was considering using 2 of these in a beetleweight:

turnigy 31kg torque metal geared servo, ?15 each

i agree with jamie though for a feathwerweight, you can get a better crush for less with an actuator. if you're still interested in servos i can dig up the link if you want. saved it on my iphone awhile ago

bitternboy · Post by **bitternboy** » Thu Feb 10, 2011 7:59 am

A setup like that is a bit, I feel, beyond the reaches of my ability. How much torque would you need from the claw to be able to hold a featherweight in place, whether it be from servo, actuator etc. ?

BTW don't worry about dampening my spirits, I've got most of the parts anyway.

bitternboy · Post by **bitternboy** » Thu Feb 10, 2011 4:38 pm

http://www.technobotsonline.com/motors/ ... otors.html ?

Team Orr · Post by **Team Orr** » Thu Feb 10, 2011 7:04 pm

to be completly honest, servos just wont cut the mustard, im using a linear actuator on 12v with 600+ kg's of crush, and a 5/9mm welded steel claw, and thats basicly what it takes to make a effective crusher/grabber...servos wont hold any featherweight down, and probably strip right away.

you would be better off buying a actuator off ebay, or if you cant do that ditch the crusher idea or just mount it on a beetleweight, because as jamie says thats the biggest weightclass that it will have any effect in

also, i dont understand your question, are you asking if those motors would work instead if the servos, it will probably have a better chance, but still wont have much effect