Switchbox is a new gearbox for FIRST robotics that has face and edge slots for easy mounting, can be quickly repaired in the field, and has two useful gear ratios: 1:20 and 1:90.
Existing planetary gearboxes' ratios aren't always optimized for what teams use them for, because of their max torque load. When these planetary gearboxes strip and break, the internal gears are hard to replace, often times requiring the replacement of the whole gearbox and motor, to save time during the heat of competition. Mounting certain gearboxes prove to be sometimes difficult because of the precision required to drill the mounting holes.
We've created an alternative gearbox to solve all of these problems. We offer 2 different gear ratios, optimized for high torque uses. Instead of a planetary style gearbox, we've created a spur gearbox to make gears easier to replace if they become stripped. To solve the issue of mounting, we've created two slots. This means that if the holes that are drilled slightly off, they'll still hold the gearbox in place.
For a while we've wanted to have the ability to use two fisher-price or other 500 series motors on the same gearbox to get more torque, and that's exactly what we did. Our solution allows you to mount one or two of these motors on the gearbox.
What rewards are available?
- A single dollar buys our our gratitude, and helps us along!
- There are two t-shirt rewards
- Stress test: we will run our gearbox under stress and publish the data online
- Switchbox gearbox with one gear reduction (20:1). This is the exact same frame and first gear stage as the other Switchbox. The only difference is that the final gear stage, axle and bearings are omitted to save money.
- Switchbox gearbox with two gear reductions (20:1 and 90:1)
- The original orange plastic prototype gearbox! There is only one of these in the world!
If you choose one of our t-shirt rewards, please go to the link below to sign up for your shirt size: http://www.customink.com/signup/1o23vdl2
There is also an unlockable reward: the Stress Test. We are committed to creating a durable gearbox that stands up to real-world robot competitions. To help further this goal, if this reward is completely reached, we will conduct a stress test and publish the results online. We will examine the effects of real-world torque and speed over time. At a minimum, we will run the gearbox for one week or until failure. Note that our exact experimental set up is yet to be determined.
What's the money for?
The $15,000 will be for an initial production of 50-90:1 Kits,
50-20:1 Kits. The money will be spent on purchasing all of the parts to make each gearbox. 60% of the money will be going towards the
purchase of the gears. 15% is going to the precision
machining of the plates and shafts. 15% is going to the purchase of the
purchase of bearings and mounting supplies. The last 10% is going to reliability and material testing to make the SwitchBox smaller, lighter and more reliable. Any money left over will go to the furthering of our product or the furthering of our robotics program.
What are the specifications?
- Dimensions: L: 7.5" W: 1.5" H: 4.2"
- Motor types: 500 series- Banebots, Andymark, Fisher Price
- Motor pinions: 12 tooth 32dp
- Mounting options: slots on either end of the top/bottom
- Mounting hole diameter: 1"x1/4" slot
- Gear reductions: 20:1, 90:1. Note: these gear reductions have been updated since our original prototype. See FAQ below for details.
- Shaft types: 3/8" hex shaft with machine rounded ends
- Shaft diameters: Idler shaft 1 1/2", Output shaft 3"
- Max output torque: 11.25 N*m, 56 N*m
Please note that these specs may change slightly as we modify the prototype to be more manufacturable. We will post news about any specification updates.
We will ship the Switchboxes to our backers starting December 15, 2012, just before
the 2013 FRC Robotics season. The ship date is based on when we receive the gears, shafts, machined sheet metal, bearings, and the other parts necessary parts for the gearbox. Then once we've gathered all the necessary materials we will assemble and ship the gearboxes.
We will make the CAD files of the finished product publicly available. This will help teams to include them in future designs, and will make it easier to modify and repair the gearbox.
How its made:
We will be purchasing most of the gears and bearings from West Coast Products. We plan to get the plates of the gear box cut from a water jet cutter at a local business then have them bent using a break. Our plan is to make the shafts in house in our shop. Then once we have all the individual pieces we will assemble the gearbox in house