Note Viewer

Lyle found a bevel box by andymark that seemed promising. the cim could fit in to the box through a planetary gearbox by andymark. The bevel box had a reduction of 2:1 and had the input and the output at a 90 degree angle. The planetary box had a reduction of 3.67:1. This put our speed at over 20 (adjusted) this is hogher than we need, so less than ideal. The total cost for the planetary gearbox and the bevel box was around $250 per wheel ($1000 combined). the issue with this was that the output shaft was 3/8 inch. None of the vex hubs to mount mecanum wheels could use 3/8 hex shaft, so we were stuck at this pont. We considered a shaft sleeve as well as a coupler. Finally, we discovered another gearbox that would work. No planetary gearbox was required. In additiopn, the output shaft was 1/2 inch hex shaft.  The reduction was high enough that a single gearbox would work. this gearbox is extremely easy to mount to sheetmetal and has a 90 degree angle just like we need. This conserves space on the inside of the bot and makes removal of gearboxes extremely simple. The total cost for this one was $200. We are waiting on clamp subteam to tell us the dimensions of our drivetrain and we still need to design the back of the drivetrain to hold together the two sides sufficiently. It will be four inches thick and around 2 feet long. The sides should be around 6 iniches thick.

Bevel Gearbox 1: http://www.andymark.com/product-p/am-2796.htm

Planetary Gearbox: http://www.andymark.com/AM-Planetary-Gearbox-p/am-0002.htm

RAW Box: http://www.andymark.com/RAW-Box-p/am-2372.htm

We figured out a good gearbox to use after a lot of struggle with the shaft sizes. Lyle worked with clamp subteam to figure out the cavity size for a while. 

We need to find a way to mount the gearbox. this should be quite simple, as it has ample mounting holes. We then need to design the back of the drivetrain to withstand the forces of each side pushing and pulling on each other. Finally, we need to design the shape of the drivetrain, the layout of the plates, then cad. Eventually we wil have to learn how to use graphite grease, but this will be an issue to resolve in a LOONG time.  We may have to allocate space for a cable for lifter. 

Figure out the gearbox mounting and the way to ensure the drivetrain is strong enough in the back. If we finish this, we can start making our BOM. Note: we will need graphite grease instead of white lithium grease. We need to work with mechanical to think about where to place electrical compnenets eventually. 

We are certainly on schedule. We have the whole design almost worked out. We should be able to get the dimensions and layout figured out by Friday and CAD might be done as earlyt as a week before the deadline (if all goes well).