This topic has 2 replies, 2 voices, and was last updated 10 years, 2 months ago by 
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While this is a Great high quality kit http://www.superdroidrobots.com/shop/item.aspx/4wd-all-terrain-enclosed-robot-platform-with-42mm-motors/1492/
I was troubled by the single wheel bearing /floating motor solution for the design and i found that the outer bearing offered by our host are to wide to fit the space between the motor mounting stand offs and i found these http://www.ebay.com/itm/130330959585?ssPageName=STRK:MEWNX:IT&_trksid=p3984.m1439.l2649
i bought a set and they fit perfectly in the internal chassis cutouts with no fitting just tapped into place . So now my axles are supported both outside and inside on bearings and the motors no longer needs to “float” and are rigidly supported against loading and they work with the original lock collars outside and inside making it a much more durable construction and able to take my over tire segmented hard track solution without stressing the drive motors shafts at all a great $40 investment to making a superb design even better !
Glad this method worked out for you. Did you leave it as direct drive? Technically, its an over-restrained design when doing it like this, but it sounds like you were able to get everything lined up and working. We sell the bearings on our site (a little more expensive than ebay) http://www.superdroidrobots.com/shop/item.aspx/steel-ball-bearing-flanged-double-sealed-for-1-2-shaft-dia-1-1-8-od/1464/
of course for a truly HD duty dual bearing design, we have our HD ATR design that has the axle supported by two bearings and is chain driven. Of course your method is more cost effective. http://www.superdroidrobots.com/shop/item.aspx/heavy-duty-4wd-all-terrain-mobile-robot-platform-with-42mm-motors/1477/
Really appreciate you sharing your ideas. Thanks
Oh i looked at the spec`s on your bearing and they had too much width at 7/16 ” W the ones i have sourced are only 5/16″ W so they fit using the current standoffs issued in the kit and are clear of the motor plate mounting screws .
Every time i open the chassis i am astounded by the attention to detail and quality of construction of your product right down to how close the cover fits ,i have to line it up just right and give it a little thump and it seats perfectly !
The class i teach did a lot of research before they shelled out the money to buy the kit i bought for them ,needless to say no one was disappointed when they saw what they had picked out .
The class runs the “show ” i only add some tweaks like these bearings and multiple insert plates for mounting the various control iterations that are being worked on and drop in to make it better as they source and add all the other elements that did not come as part of the kit .It is a superbly designed tool to teach with !
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