View Single Post
  #6   Spotlight this post!  
Unread 22-01-2006, 16:38
kmcclary's Avatar
kmcclary kmcclary is offline
Founder 830/1015;Mentor 66/470/1502
FRC #0470 (Alpha Omega Robotics)
Team Role: Engineer
 
Join Date: Aug 2001
Rookie Year: 1994
Location: Ann Arbor, MI
Posts: 491
kmcclary has a reputation beyond reputekmcclary has a reputation beyond reputekmcclary has a reputation beyond reputekmcclary has a reputation beyond reputekmcclary has a reputation beyond reputekmcclary has a reputation beyond reputekmcclary has a reputation beyond reputekmcclary has a reputation beyond reputekmcclary has a reputation beyond reputekmcclary has a reputation beyond reputekmcclary has a reputation beyond repute
Re: 1541 Prototype Drivetrain

Wow... VERY cool...

Quote:
Originally Posted by bombadier337
As to getting up the ramp, we can get it, but we have can't go up the middle. It has to lean against on the plywood sides.
OOC, a couple of questions:

1) Are these the 8" Andymark trick wheels, or the 6"?

2) Whose gearboxes are those? That's a sweet package! How are they
switched, and what gear ratios do they provide in high and low?

3) What sprocket pair ratio are you using between the gearbox and wheel?

We been looking at some AM trick wheels ourselves (and ordered a
few for tests... No ship yet, so we're looking at other wheels too).

We were hoping to get away with only a single speed transmission
this year. Four AM or COTS 2-speed transmissions would be very
expensive (worse, EIGHT so we'd have a practice bot too).

But my REAL fear has been that omnis simply wouldn't get us up the
ramp at ALL with a one-speed transmission, without a gear ratio set
that would "crawl" on the ground game.

Now, from what I'm reading, I'm even *more* concerned that
people are saying that they may have to be "tweaked" with some
machining, just to keep them from binding.

How long did it take you to "fix" the wheels?

Based on your experience, any comment on what ratio we'd have
to have to get 8" AM omniwheels to climb it with a full weight
bot, using one regular CIM per wheel? FYI: We ordered the white
rollers (0.9 COF) for our "testing bot", because they wouldn't
mark up the school's and sponsor's floors as much as the black
rubber ones would for demos...

I dunno... Though VERY cool, from what I'm hearing mixing this year's
ramp and AM trickwheels doesn't sound like a promising solution.
Even if they DO arrive, we may want to stick with our "other plan".

Is there someone here with more experience with them know of
a decent gear ratio to make them work with this year's ramp?

- Keith
__________________
Keith McClary - Organizer/Mentor/Sponsor - Ann Arbor MI area FIRST teams
ACTI - Automation Computer Technologies, Inc. (Sponsoring FIRST teams since 2001!)
MI Robot Club (Trainer) / GO-Tech Maker's Club / RepRap-Michigan) / SEMI CNC Club
"Certifiably Insane": Started FIVE FRC teams & many robot clubs (so far)!
2002: 830 "Rat Pack" | 2003-5;14: 1015;1076 "Pi Hi Samurai" | 2005-6: 1549 "Washtenuts"/"Fire Traxx"
2005-(on): 1502 "Technical Difficulties" | 2006-(on): FIRST Volunteer!
2009-(on): 470 "Alpha Omega" | WAFL | Sponsor & "Floating Engineer" for MI Dist 13 (Washtenaw Cnty)
2011: 3638 "Tigertrons" | 2013-(on): 4395 "ViBots" | 2014-(on) 66 "Grizzlies"
"Home" Teams: 66, 470, 1076, 1502, 4395
Local FIRST alumni at or coming to Ann Arbor (UM/EMU/WCC/Cleary)?
...We Want YOU as a Mentor! Please email me for info!
Support CDF Reputation - If a posting helped, thank 'em with rep points!
"It must be FRC build season when your spouse and children become 'Action Items 8 & 9'..."