I would like to make a rover with gws s06 servos and off road tire5". I know the servos are not the best solution but I am beginner in robotic and I wanted to start with something simple. I use for the controller an arduino card.
My questions are :
Is it possible to adapt the tires on the servos ? Is it necessary to use a hub and which one ?
I see on this forum someone preferred hittec servos (a continous rotation version with a torque around 4,6kg). Do you think this servo is better than a gws s06 with a torque of 7.2kg ?
-How much weight my rover will be able to carry ?
Thanks for your answers. PS:
First, sorry for my poor english
Donât hesitate to correct it
I donât think any servo is going to be able to hold a 5" off road wheel let alone drive it!
I think if you want wheels that big you will have to get a gearhead motor. Otherwise you will have to go for smaller wheels, possibly ones that are mad for servos to drive?
I donât think the servo will be able to hold the wheel. Servos only have a small plastic output sprocket, they are not designed to hold large wheels.
The gearhead motors have a larger, longer, and stronger metal output shaft that can handle the extra weight of the wheels and a larger rover.
I would like to know which hub it is possible to adapt on the gws s06 ? I have already the servos. I would like to do the test even I got some problems.
You really have to give up on the idea of using servos to connect 5" wheels to! Just look at the size of the spline compared to the size of the wheels! The wheel will just rip itself off. And if it doesnât, it will move all over the place.
If you want to use servos, you will have to find some wheels that are made to be driven by servos.
If you want big wheels, you need a big drive system like gearhead motors. You will also find that motors will give you more torque, more speed, and a greater weight capacity for your robot.
If youâre still not conviced you will have to find your own way to mount the wheels onto a servo, as far as I know, there are no hubs made for such a thing. Please correct me if Iâm wrong.
Please, read between the lines. Even if your servos had aluminum horns the output gear on the horn would break because of the emensely large wheel. Servo wheels are specially made to run with servos. These are what you will have to use if you want to continue with servos.
well, actually⊠lynxmotion makes the tapped aluminum servo horn HMSH-02, and there is also servocity.com/html/servo_hub.html. We should mention though that a lot of the time these are used with metal gear and ball bearing servos as the servo itself becomes the weak link. Using this stuff on a 1422CR or its GWS equiv. servo is going to result in a very short lived servo. The plastic gears and nylon sleeve bearings just will not handle well the side load and torque one would tend to associate with a platform on 5" dia. wheels.
Iâve only worked with the GWS s06 servos enough to have tried them, and decided that I didnât like them at all. In evaluating them, I saw that the âdual bearingâ surfaces are at best only about 1/4" apart, as with most servos. While this may be well and good for servo-type applications, it simply isnât enough separation to provide the kind of rigid support that a wheel of that type and size needs, especially when you consider that those bearings are supporting a plastic shaft in a plastic case.
Even if you manage to mount the 5-inch wheels onto the servosâ output shafts, and even if you do manage to drive them around for a little while, it wonât take long before your wheels develop a lot of slop, if they even make it that far before the gears start to strip out due to misalignment and general stress on the reduction train.
I think this was what happened to my Hitec 1422CR servos I had running on WALTER. I had 3.75" tires on these servos. It appears the spline of the servos just finally stripped, which I can understand as hard as I fiddled with WALTER in testing various things. WALTER also gained quite a bit of weight at various points which also over stressed the wheel servos. I checked the horns that attach to the wheels and they look fine. This is one reason I am converting to use gear head motors for all wheeled robots I build from now on. I have the new GHM-04 motors all installed and just waiting until I can replace the motor controller to continue testing.
