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Speed 900-gear ratio
Alex, 100mm wheels will be WAY too fast for matts ratio. They are 5:1 and he just wanted the fastest he can get without burning the motors out and in a single stage.
The way you have drawn the gearbox will work, but with a 10:1 reduction on a single stage is quite alot and might not fit it in. I personally would build a 2 stage gearbox.
You havent stated what sort of speed you want so these ratios are just guesses. Do you want it really fast, real slow for easy control of in between?
Ploughbot is a fast featherweight with a theoretical speed of 9MPH, people say all these fancy speeds but they arent quite real.
Work out the sort of speed you want, it depends on the type of robot it is. I would Aim for the 8/10mph unless it needs to be really accurately driven.
Easy to work out the ratio you need.
Speed of motor divided by the ratio used. That gives RPM of the wheel, then work out the circumfrance of the wheel (diamtre x 3.124) that will give you the distance travelled in mm per rotation, turn that into metres.
Multiply that by the RPM at the wheel which will then give you metres per minute. Divide by 60 to get m/s. Then multiply that by 2.237 to get MPH.
Its worth making a note of that and tring to learn the rough workings out of ratios/velocities as it will help you alot.
Alex, 100mm wheels will be WAY too fast for matts ratio. They are 5:1 and he just wanted the fastest he can get without burning the motors out and in a single stage.
The way you have drawn the gearbox will work, but with a 10:1 reduction on a single stage is quite alot and might not fit it in. I personally would build a 2 stage gearbox.
You havent stated what sort of speed you want so these ratios are just guesses. Do you want it really fast, real slow for easy control of in between?
Ploughbot is a fast featherweight with a theoretical speed of 9MPH, people say all these fancy speeds but they arent quite real.
Work out the sort of speed you want, it depends on the type of robot it is. I would Aim for the 8/10mph unless it needs to be really accurately driven.
Easy to work out the ratio you need.
Speed of motor divided by the ratio used. That gives RPM of the wheel, then work out the circumfrance of the wheel (diamtre x 3.124) that will give you the distance travelled in mm per rotation, turn that into metres.
Multiply that by the RPM at the wheel which will then give you metres per minute. Divide by 60 to get m/s. Then multiply that by 2.237 to get MPH.
Its worth making a note of that and tring to learn the rough workings out of ratios/velocities as it will help you alot.
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