Quote:
Originally Posted by 854 bears
I am doing a little off season project and experimenting with different ways to mount the drive motors to save space. My current design involves a set of spiral bevel gears, with one mounted directly onto the CIM shaft and the other on an axle supported on both ends. I don't have any experience using or mounting bevel gears, but during my research one source said that these type of gears puts a strong horizontal force on the shafts. All I am wondering is weather or not the CIM will be able to handle this force, or if I need to support the other end of its drive shaft. I don't have many specifics yet, but the gears will most likely be a 3:1 reduction.
PS. these plates will be CNC'd so everything will be precisely aligned, and built strong.
Any suggestions or thoughts will be greatly appreciated.
Thanks,
Team 854
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Jim's already addressing the thrust issues with you, so I won't be addressing that here. My concern is the gear ratio. 3:1 is a little low unless you plan on using very small wheels. (I'm assuming direct drive from the second bevel gear).
Here is a good general guide line when working with the CIMs to make sure you don't overload them.
The KOP Toughbox is a 12.75:1 ration gearbox. In addition, the output and wheel sprockets give an additional 22:15 reduction. So, 12.75*(22/15)= 18.7:1 total reduction. Now, the KOP wheels are 6in. dia. Therefore, 3.1417*6= 18.8 in circumference.
One quick way to look at this is, design for approximately
one revolution of the CIM for 1 inch travel. This is for a 150 LB. robot and it is
only a rule of thumb.
Now, from experience, +/- 25% on these numbers works, but is not always optimal. Make sure you take into account what you goal is: Speed, Torque, Longevity etc.
Your milage may vary.