I need to 75 lbs across a flat surface at between 3 ft and 9 ft per min. with a three inch wheel I think I need a notched belt system with a gear motor where the drive rpm is between 12 and 36 rpm. if this is difficult to attain could go to a 4 inch wheel. I just need a rheostat as this need not be remote controlled. could you recommend a gear motor , wheel , notched belt gears , that you supply that I might be able to use. 12 volt DC would be preferred.
Thank You, Ed McCall
To confirm, you want just one wheel connected to a timing pulley, and the timing belt will be mounted to the surface to create a “track”? If so, given the weight, you might instead opt for a chain and sprocket. Will the weight be supported by free spinning wheels? A quick calculation is to convert the RPM to radians per second and multiply that by the circumference to get the linear velocity per second. Start with this tool to get an idea of torque and RPM:
robotshop.com/blog/en/drive- … -tool-9698
Even though you might suspect the surface to be flat, at least put in a 2 degree angle to compensate for static friction. Tell us what you get, and if you can provide a basic sketch of the setup, it will help us understand better.
this device is driven by one wheel but is balanced on four. it is guided manually, but I need to control the speed to between 3 and 9 ft per min., it holds a heat gun and is used to weld to materials together. I’m using the battery for weight and power, and hand guiding it along the seam. I can use a wheel with some kind of sprocket or a timing belt as the wheel.
I think the rpm of the gear drive should be around 100 with a 3 inch wheel and less with a 4 inch wheel
Can you use the tool in the previous link to get an idea of the torque and RPM? From there we can suggest a motor. Given that it’s quite heavy, you’ll likely need something like:
robotshop.com/en/12v-5310-rp … motor.html
robotshop.com/en/banebots-p8 … x-256.html
yes that sounds about right before I order I need to make sure about the wheel , a three inch wheel would give me up to 16 ft per min which would be fine.do you have a 3 inch wheel that would work. I also need a way to vary the speed.
Wheel or sprocket?
Ex: Roughly 3" diameter: robotshop.com/en/aluminum-sprockets-48t.html (be sure that it matches the chain you intend to use)
Note that you’ll also need a compatible hub.
You would use a DC motor controller to vary the speed. Take a look at the following article for how to do so:
robotshop.com/blog/en/how-to … oller-3695
