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RAW Box (am-2372)

 
Price: $219.00

Stock Status: In Stock
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Product Usage:
All AndyMark gearboxes require grease for proper operation and long life. We suggest using our red tacky grease, am-2768. We also encourage that the user powers the gearbox continuously for 30 minutes without grease to allow the gear teeth to wear in. While we do design with short run times in mind, this 'run in' period for smooth gearbox operation, is recommended. Once this is completed, thoroughly grease the gear teeth periodically to ensure smooth operation.

NOTE: When operated correctly the angle of the worm in the RAW Box allows it to back-drive.


Product Overview:

The RAW Box is a strong, compact gearbox utilizing CIM Motors. Steel and brass worm gears are used in order to provide a setup where the CIM Motors are located at a right angle from the output shaft. Since one or two motors can be used as input for this gearbox, and the gears are made of strong materials, this gearbox can provide a high level of torque.

The worm gear shaft is driven by a spur gear. This spur gear is driven by another spur gear located on the output shaft of the CIM Motor. These two spur gears can have their position swapped in order to change the overall reduction of the gearbox. The Standard Ratio is how the gearbox is pre-assembled and shipped. The Switched Ratio is what the user can get, after re-positioning these gears.

Specifications:
  • Overall Ratio, Standard: 14.2:1
    • Pinion Gear: 12 tooth, 20 dp
    • Driven Spur Gear: 17 tooth, 20 dp
    • Worm: 0.500 pitch dia, 25 PA, steel, 5/8" hex bore
    • Worm Gear: 40 tooth, 25 PA, brass, 1/2" hex bore
  • Overall Ratio, Switched: 7.1:1
    • Pinion Gear: 17 tooth, 20 dp
    • Driven Spur Gear: 12 tooth, 20 dp
    • Worm: 0.500 pitch dia, 25 PA, steel, 3/8 hex bore
    • Worm Gear: 40 tooth, 25 PA, brass, 1/2" hex bore
  • Weight: 1.39 pounds (without motors & pinion gears)
  • Worm Shaft Material: 4140 steel
  • Output Shaft Material: 4140 steel
  • Output Shaft Size: 1/2" Hex
  • Max Output Torque: 90 foot-pounds

Included Hardware:

Design Background:
This gearbox design is heavily influenced by the two-motor Right Angle Worm gearbox made by student designer Joey Milia of FRC team 192, GRT (Gunn Robotics Team) from California. Joey and GRT came up with this successful design for the 2012 FIRST Robotics Competition. Thanks, Joey and team 192 for providing this design to AndyMark so that the robotics community can utilize this design! A picture of Joey and his initial gearbox design is below.




Average Customer Review: 4 of 5 Total Reviews: 8 Write your own review!

  0 of 0 people found the following review helpful:
 
Could be better March 16, 2016
Reviewer: Anonymous Person  
The raw boxes have served only one purpose on our team: to be a go-to system until we find something better. Unfortunately, our raw boxes we have purchased have all quickly degraded to being able to be back-driven. They have a good ratio and design, but upon receiving them, we had to oval out some of the mounting holes because of inaccuracy and we were unable to mount our own CIMs to them. In the case that these issues would be fixed, easily would have earned 5 stars.

(AndyMark Response: The product page states this gearbox is back-drivable due to the angle of the the teeth on the worm. We will make the information more clear. Thank you for the feedback.)

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  0 of 0 people found the following review helpful:
 
Excellent choice this season June 21, 2015
Reviewer: Brent from Kansas City  
We had one on the front and one on the back of our 2015 bot running chain/hook elevators.  Both lasted through 2 regionals and the Worlds without issue.  They handled the weight of 5 totes ea. without back driving.  We did have to tap holes for our encoders to mount - adding that would be an improvement.  Also, the build quality looked a little rushed and probably was due to demand.  We originally had some noise in one and had to disassemble part of it and re-align.  The CIM holes on the other were off slightly.  All in all a great gearbox though.

(AndyMark Response: Thank you for the compliments, we are looking into adding encoder mounts and will continue to work on quality improvements, thank you for letting us know.)

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  0 of 0 people found the following review helpful:
 
The RAW Box gets the job done! March 3, 2015
Reviewer: Rufus Cochran from Fishers, IN United States  
I was very impressed by the compact size, solid construction, and easy assembly of the RAW Box.  In all of our testing, the RAW Box did not back drive (tested with loads exceeding 60 lbs) while powering a simple single compound pulley system.  Well done!

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  0 of 0 people found the following review helpful:
 
A little expensive! February 2, 2015
Reviewer: Neill Nakamura from Kahului, HI United States  
I was very surprised to see how well built and compact this gear box is. Just wish the price was more reasonable.

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  0 of 0 people found the following review helpful:
 
Great Gearbox :D September 12, 2013
Reviewer: Anonymous Person  
excellent

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