I agree with Randy and Lloyd. Gears should be reserved for the lift-arm motor. The motors have plenty of speed already for the drive wheels and a good amount of power too. If you need more speed, just go with bigger wheels, you don't need gears. If the lift arm motor needs to lift a heavy load, the motor will not be able to hold the load in position when it is not being driven. In this case, putting a small gear on the motor that drives a larger gear that attaches to the lift arm will allow the motor to hold the heavy load in place. Also, if the lift arm motor needs to control an attachment that spins on an axis perpendicular to the motor's axis, using those 4 pronged knob gears works well. Andy Cougar Spirit -----Original Message----- From: First Lego League in Virginia and DC [mailto:[log in to unmask]] On Behalf Of Randy Greene Sent: Monday, October 18, 2010 1:03 AM To: [log in to unmask] Subject: Re: [VADCFLL-L] VADCFLL-L Digest - 16 Oct 2010 to 17 Oct 2010 (#2010-95) I agree with Lloyd. Con: Extra complexity, more for the kids to learn, more possibility of things to go wrong. Pros: Extra torque or extra speed if needed. My take: I would only suggest gears to the students for an arm motor if needed. Randy Greene Fairfield Court Eaglebots #1999 -----Original Message----- Date: Sun, 17 Oct 2010 19:12:47 -0400 From: Lloyd O'Hara <[log in to unmask]> Subject: Re: GearsVsNoGears ------=_NextPart_000_000F_01CB6E2F.48C09510 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I can give you my personal perspective. Only use gears, if you need = gears. If you need to gear up or down then it's worth it. If you don't = need to gear up or down, they become one more moving part that can go = wrong and/or cause inconsistency. I've always liked the idea of = simplicity, the less things that can go wrong, the better. Lloyd ----- Original Message -----=20 From: Hemamalini Manapakkam=20 To: [log in to unmask] Sent: Sunday, October 17, 2010 6:50 PM Subject: [VADCFLL-L] GearsVsNoGears Hi All, Can anyone give the pros and cons of using gears in their robo. Thanks in advance. Technobots -- To UNSUBSCRIBE or CHANGE your settings, please visit https://listserv.jmu.edu/archives/vadcfll-l.html and select "Join or leave the list". -- VADCFLL administrative announcements are sent via VADCFLL-ADMIN-L. Visit https://listserv.jmu.edu/archives/vadcfll-admin-l.html to subscribe. -- To UNSUBSCRIBE or CHANGE your settings, please visit https://listserv.jmu.edu/archives/vadcfll-l.html and select "Join or leave the list". -- VADCFLL administrative announcements are sent via VADCFLL-ADMIN-L. Visit https://listserv.jmu.edu/archives/vadcfll-admin-l.html to subscribe.