Cheap lazy susan's aren't very good at taking a side load. When you say you can spin the assembly by hand are you replicating the side load your belt is applying to the bearing? If you do you may find it binding. I used a lazy susan in T047 (but didn't get any good pics of the rotate setup). To keep the lazy susan centered I built a drum assembly that was attached to the lazy susan bearing that extended into the tank. Rollers where attached to the underside of the top of the hull which kept the assembly centered. The lazy susan bearing bore the weight of the turret and the rollers kept it centered. This pic shows the drum.
http://rctankcombat.com/tanks/T047/07photo-large.jpg Maybe Rob can take some more pics of Heidi and upload them to the site for a better visual explanation of how Heidi's turret swings. It's a really cool setup! If side-load binding is causing your problem I'd suggest adapting a bit of Cromwell tech to fix it. Install a 1/2" bolt at the center of rotation on your turret base plate that extends into your hull. The bolt will run through a bearing attached to the underside of your hull. Your belt sprocket then attaches to the bolt. Something like in this pic: http://rctankcombat.com/tanks/T040/13Cromwell041-large.jpg In fact, if you do something along these lines you will not have to attach the turret to the lazy susan bearing, it would only sit on top of it. Steve Tyng On Jun 21, 1:56 am, Ben Holko <[email protected]> wrote: > I started to build the turret and traverse this weekend, and it didn¹t go so > well. > > I cut out the base plate for the turret, and the top hull plate that it will > sit on. A 12² lazy susan provides the bearing, the base plate and top plate > get bolted to that and all was well with that. It had a little more > resistance than I had thought it would, but I guess the bearings in these > cheap lazy susan¹s leave a bit to be desired. > > I have a 12v geared motor from surplus center > (https://www.surpluscenter.com/item.asp?UID=2009062005294011&item=5-16... > ame=electric ) which I am using (trying) for the traverse. Together with > some mini timing belt components from Small Parts Inc (via Amazon). Problem > is however that the motor doesn¹t seem to have enough grunt, and the weak > point in the link is the timing belt components, the belt is jumping teeth > on the sprockets. > > I have reviewed all the build pages on the tanks which detail their traverse > systems, and have gained little further inspiration. According to Surplus > Center this motor has 48 lb-in of stall torque, most other motors I see have > far less than that, can anyone weigh in with the bearing/drive/torque > combination that they have found success with? > > PS: also hacked up the exhaust armor guards > > Exhaust Guards 01.JPG > 252KViewDownload > > Exhaust Guards 02.JPG > 324KViewDownload > > Traverse Failure 01.JPG > 184KViewDownload > > Traverse Failure 02.JPG > 210KViewDownload > > Turret Base.JPG > 196KViewDownload --~--~---------~--~----~------------~-------~--~----~ You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat -~----------~----~----~----~------~----~------~--~---
