Nice Cheap Servo for Continuous Rotation Modification
I'm building one or two small mobile robots each week now (oh, how I love my new job!) and I've been modifying several different cheap standard-size servos for continuous rotation. Some are easier to mod than others, some have better fine motor control. This week's favorite is Hobby King's Turnigy TGY-S4505B .
1) It's cheap, $5.10-$5.65 depending on Int'l vs US warehouse and if you wait a while to order (discount offered)
2) Dual ball bearings for long life
3) Doesn't need the internal pot for support. Just snip off the plastic pot shaft and it's mechanically disconnected.
4) Snip a single post off the output gear for 360 degree rotation
5) Unsolder 3 pot wires (note color, they vary) and route thru a small hole in the case to an external 5-10K trimpot.
6) Excellent center stop stability
7) Excellent fine motor speed control
8) 1.75" diameter circular servo horn included makes a fine free instant wheel, just cut a rubber band "tire" out of an old road bike innertube.
It uses nylon gears, so don't overload it, but I was pleasantly surprised how well this one works. I hate re-nulling drifty CR servos every other day, and so far I haven't had to with these. A five-star thumbs-up from erco, I'm ordering more.
Edit: Servos driving 1.75" servo horn "wheels" at 6V (4xAA) gives maximum forward speed of ~7"/sec.
1) It's cheap, $5.10-$5.65 depending on Int'l vs US warehouse and if you wait a while to order (discount offered)
2) Dual ball bearings for long life
3) Doesn't need the internal pot for support. Just snip off the plastic pot shaft and it's mechanically disconnected.
4) Snip a single post off the output gear for 360 degree rotation
5) Unsolder 3 pot wires (note color, they vary) and route thru a small hole in the case to an external 5-10K trimpot.
6) Excellent center stop stability
7) Excellent fine motor speed control
8) 1.75" diameter circular servo horn included makes a fine free instant wheel, just cut a rubber band "tire" out of an old road bike innertube.
It uses nylon gears, so don't overload it, but I was pleasantly surprised how well this one works. I hate re-nulling drifty CR servos every other day, and so far I haven't had to with these. A five-star thumbs-up from erco, I'm ordering more.
Edit: Servos driving 1.75" servo horn "wheels" at 6V (4xAA) gives maximum forward speed of ~7"/sec.
Comments
So what would they call this combination of consulting and inventing? How about ConVenting? Or there's always InSulting!
Welcome to the world of work-at-home, pal! Just remember to change out of your jammies if you make a quick trip for hardware at the Home Depot.
Or send a tele-presence robot out on the chores and stay in your jammies!
And selling more... You sir, are a menace!
At least I've learned to order all I want before posting. I've previously had some good parts bought right out from under me when I shared before ordering. Only after I hoard do I turn you vultures loose to feast on the leftovers.
I still gotta figure a way to get my 5%.
I missed that initially. Very well crafted, good sir! I am indeed a paid professional InSultor.
This is the main reason I buy my hardware online.
And they're not jammies; they're work clothes!
Online? Impossible for most plumbing repair jobs from my experience. It's maddening staring at the wall of various fittings at Home Depot, trying to get all the parts, valves and NPT, street elbow parts to fit together for any particular application. Click & order will never replace brick & mortar (thank goodness) for most one-time jobs IMO.
And no, I've never had any complaints about my PJs! I keep my drop seat firmly buttoned for the most part.
"Depends", said the old fellow.
Spring RC SM-S4303R
http://www.ebay.com/itm/231493244643
My previous favorites were GWS CR servos that tolerated 7.2 volts. But these are a bit better.
High praise indeed from Martin, the Master of Mechanical Mayhem! Happy to hear you concur.