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Unread 21-04-2003, 07:16
Matt Reiland's Avatar
Matt Reiland Matt Reiland is offline
'The' drive behind the drive
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Quote:
Originally posted by DougHogg
Thanks for the info. If you don't mind my asking,
a) Did you ever have a problem with drawing so much juice from the battery that you lost power temporarily?

b) Why do you want to use something other than the air cylinders for shifting?

c) Since weight is always an issue with us, how do you plan to make your gear box smaller?
No Problem Doug,

a.)First, the gear ratio worked pretty well such that in high we had plenty of speed and power and we never drew so much that we had a power problem at all this year. Along the same line, next year we will make a specific left and right gearbox to keep the drills rotating the same direction to keep left right performance identical. Ratios:

From Drill to CIM Drill (Think it was 16 tooth to 48 tooth) welded to a 16 tooth and pressed onto the CIM motor. CIM mated to a 50 tooth gear which also drives a 20 tooth gear, output gears were a 50 tooth for high and a 80 tooth for low.

b.)Why would you want to use something other than air? Well our robot wasn't using the pneumatic system for anything else except for shifting this year, and if it was we ate at least one cylinder of the four for shifting some teams used two. Shifting with the 45 transmission can be done with a very light push or pull so I am looking into using a spring loaded linkage similar to a gas RC car throttle so that the servo will go to it's preset position and apply spring force until the shift is engaged. By using only 1 cylinder we also used up valuable space in the chassis for the linkage of the two transmissions. All in all it works fantastic as it is but I think we can get the same performance in a smaller lighter package (Team 45 also shrunk theirs this year)

c.)Weight & Size - The first thing to do is to look at the gear ratios. The final output stage was 1:1 in high and 4:1 in low with the High output gear an 80 tooth 20 pitch fairly heavy gear. Rather switch to 2:1 in high and 1:2 in low. We will get rid of the three finger dog mates and mill the mate into the output gears like 45 did this year. All of the heavy steel gears will not only be drilled but also the web between the hub and the teeth will be reduced considerably. The gears all start as solid steel with a large steel hub. To remove weight always look to the steel first for the biggest bang for the buck. Also for construction of the gearbox we will use some of the info gained from Team 111. Notice in many of their designs the nice 90 degree break on all of the flat plates, our gearbox plates were all 1/8" and all of them are wavy from the forces applied to them this year

Truly a wonderful design Team 45!
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