I just completed a project with servos that came in the kit. I have some ideas for new projects and need more servos. I have searched several venders but noone lists the degree it will turn. I don't want to buy a servo without knowing if it turns 90*, 180* or 360*. There are some specs for each servo on the websites like:
Speed
Stall Torque
Dead Band Width
But I need the degree of motion. Is there some way of knowing how far it will turn before I buy it?
Exactly how much motion do you need ?
Most standard servos move though something close to 180 deg - some a bit less, some a bit more. I am not aware of any that only move 90 deg.
If you want more than 180 deg with position control you need a sailwinch servo. They can usually turn through 3 full revolutions and that is usually stated in the spec.
If you don't need position control you can use a continuous rotation servo (or convert a standard servo to continuous rotation). They allow you to control speed and direction, but not position. In effect they are geared DC motors with in-built controllers.
...R
Thanks for the input. I will probably get a few different kinds and play around to see what they are capable of.
I just built a small sentry gun toy. I want to build a bigger one that will use bigger servos than the 9g that I have. I have the VisualSizer program to help determine which servo I need for the project (I am still designing it and dont know how much torque i need yet). I am still very new to servos. When I went to purchase them, I got alot of specs but nothing about the degree of rotation. I figured there was maybe a standard for this since it was not listed.
Thanks for your help. I wanted to make sure before buying something I don't need.
As your project involves guns (even a toy one) I won't be participating further.
The only purpose of weapons is to make someone do something they would not do voluntarily.
The world would be much better without weapons.
...R
Try a website called www.servocity.com
If I recall they had specs on the servos they sell.
https://www.servocity.com/html/hitec_servos.html
Just checked them out. Great site. Everything I need and then some. Some of it is a little pricey but I would rather use good quality parts. Thanks CrossRoads for the info.
Can always search for better prices once you know what you're after.
Take shipping costs into consideration as well, as well as cost of other components to mount the motor, wire it up, control horns & screws & stuff. Sometimes one-stop shopping works better than paying for shipping from 3 places, for example.
Robin2:
Exactly how much motion do you need ?Most standard servos move though something close to 180 deg - some a bit less, some a bit more. I am not aware of any that only move 90 deg.
Ha, if only. You are lucky if you get 150 degrees, 120 is common.
Hobby servos are exactly that, hobby components designed to operate RC planes.
If you want well engineered components to an exact specification you pay perhaps
an order of magnitude more.
Ha, if only. You are lucky if you get 150 degrees, 120 is common.
You may have gotten some bad servos or not applied proper commands to control them. I've got a lot of common hobby servos and only remember maybe one that would not rotate 180 deg. It may have had an issue such as internal pot alignment as it was very inexpensive.