I have found the cheapest servos to be at Hobby King. www.hobbyking.com They take a long time to fill orders and if you are only getting a couple servos shipping will be more expensive then the servo. Cheap servos are dicey, try to look at the reviews when you pick one or google them a bit.
I don't know which servo to choose because they don't tell you if its 180 degrees or not.if you know any other places who sell 180 degrees servo for cheap?
What size are you looking for? Micro, Mini, Standard, Giant scale? Sometimes the small ones are rated in grams. Aside from that (not that I'm an expert) I think 180 degrees is a general maximum throw. 360degree is usually special case or modified and "I've" never heard of a positioning servo with significantly more throw than 180 degrees. Someone may know of some though.
Erco has a knack for finding servos REALLY cheap. If you're not in a hurry, watch the Robots and General sections for his post.
Otherwise, HiTec has excellent quality servos, generally with excellent docs. I purchased six HS-322HD for $36?? + free shipping from Tower during a special. I'm not sure what your budget is.
On HobbyKing, their data isn't always the greatest. If you look below the product it'll have customer reviews. It's not uncommon for someone to have a full spec list in their post... you are assuming it's accurate of course.
Then there is ebay for the greatest deals. Again you are assuming the data accuracy if any or if you can find it for the knock-offs.
I KNEW I shoulda left that bit out! Wow 1260 degree positioning....
I looked for a little bit. I found one site that claims the Turnigy servo they have for sale is +/- 90degrees, but they use their own part number which means nothing. That's all I could find, sorry.
I can't recall a time when I tired to move a servo +/- 90 degrees but couldn't.
Hmmm, well maybe not quite. I do remember having trouble getting a full 180 degrees on occasion. So I would say that +/- 80 degrees is really common, perhaps more.
The cheap HobbyKing servos I linked to in your other thread would rotate at least 180 degrees. If you look at the video in my QuickStart servo tester thread, you can see the servos move over there full range.
I'll test the other servos I have and let you know which ones will rotate a full 180 degress.
Dynamixel AX-12+ robot controllers (more expensive than normal hobby servos) can rotate continuously but you can only get position feedback on 300 degrees of the motion.
Here are three cheap servos I learned about here on the forum.
HXT900 Mini-Servo $2.69. These appear to have 180 degrees of rotation. HX12K Metal Gear $7.97. These are really strong for the price. While the physical stops would allow 180 degree rotation they only rotate about 135 degrees. These are really easy to modify to countinuous rotation. The screw that holds on the servo horm has a 3M thread. The same as JR metal gear servos. This makes it easier to use modified servo horns that might be thicker than the original servo horns (such as wheels). Vigor VS-10A Monster Servos $11.99. The physical stops on these also allow 180 degree rotation but they rotate less than the HX12K servos (about 120 degrees).
I assume you mean the HXT900? It has three wires. The picture on the product page does make it look like there are only two. I used two of the HXT900 servos in the video of the QuickStart servo tester. I think you can see it has three wires in the video.
Roboticsmaster128
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Erco has a knack for finding servos REALLY cheap. If you're not in a hurry, watch the Robots and General sections for his post.
Otherwise, HiTec has excellent quality servos, generally with excellent docs. I purchased six HS-322HD for $36?? + free shipping from Tower during a special. I'm not sure what your budget is.
On HobbyKing, their data isn't always the greatest. If you look below the product it'll have customer reviews. It's not uncommon for someone to have a full spec list in their post... you are assuming it's accurate of course.
Then there is ebay for the greatest deals. Again you are assuming the data accuracy if any or if you can find it for the knock-offs.
If you find a servo that fits your price range, sometimes this website has the full specs: http://www.servodatabase.com/servos/turnigy
Sail winch servo.
I looked for a little bit. I found one site that claims the Turnigy servo they have for sale is +/- 90degrees, but they use their own part number which means nothing. That's all I could find, sorry.
-Phil
Hmmm, well maybe not quite. I do remember having trouble getting a full 180 degrees on occasion. So I would say that +/- 80 degrees is really common, perhaps more.
I'll test the other servos I have and let you know which ones will rotate a full 180 degress.
Dynamixel AX-12+ robot controllers (more expensive than normal hobby servos) can rotate continuously but you can only get position feedback on 300 degrees of the motion.
http://www.pololu.com/catalog/product/522
-- Gordon
HXT900 Mini-Servo $2.69. These appear to have 180 degrees of rotation.
HX12K Metal Gear $7.97. These are really strong for the price. While the physical stops would allow 180 degree rotation they only rotate about 135 degrees. These are really easy to modify to countinuous rotation. The screw that holds on the servo horm has a 3M thread. The same as JR metal gear servos. This makes it easier to use modified servo horns that might be thicker than the original servo horns (such as wheels).
Vigor VS-10A Monster Servos $11.99. The physical stops on these also allow 180 degree rotation but they rotate less than the HX12K servos (about 120 degrees).
I assume you mean the HXT900? It has three wires. The picture on the product page does make it look like there are only two. I used two of the HXT900 servos in the video of the QuickStart servo tester. I think you can see it has three wires in the video.