Tommy Styrvoky Posted May 9, 2014 Posted May 9, 2014 I'm planning to build a transmission for a King Tiger in 1/15 and it will weigh around 7-12 LBs. Any idea if a technic drive ring or 16t gears will be able to withstand a 1;1 ratio and a 12:20 ratio when being supplied by a XL motor ( there will be 1 gearbox and motor per side)? Quote
Jim Posted May 10, 2014 Posted May 10, 2014 Moved it over here! You will have a better chance to get an answer. Welcome to Eurobricks by the way! Quote
MrNumbskull13 Posted May 11, 2014 Posted May 11, 2014 If you brace it properly you should be fine. I've never broken a gear, it's all about bracing IMO. Quote
Milan Posted May 11, 2014 Posted May 11, 2014 I would not use driving rings. They tend to force themselves out of clutch gear under torque, and are hard to keep them there. Make your own gearbox with double bevel gears- 1:1 and 12:20.They will withstand XL motors in any occasion. Just brace them at both sides. Quote
andythenorth Posted May 11, 2014 Posted May 11, 2014 (edited) Related - any comments on using knob wheels in a PF drive train? Setup would be: L Motor, knob wheels (90º), 12t double bevel-> 20t double bevel in portal axle frame, Power Puller wheel. (1 motor per wheel). I have broken lots of 12t single bevel gears in other mocs. Wondering about using the knob wheels for a 90º turn I need to do. They're high friction though. Alternatively I could do the 90º with bevels and make them easy to replace. Thoughts? Also anyone split a 20t single bevel? Edited May 11, 2014 by andythenorth Quote
Zerobricks Posted May 11, 2014 Posted May 11, 2014 Related - any comments on using knob wheels in a PF drive train? Setup would be: L Motor, knob wheels (90º), 12t double bevel-> 20t double bevel in portal axle frame, Power Puller wheel. (1 motor per wheel). I have broken lots of 12t single bevel gears in other mocs. Wondering about using the knob wheels for a 90º turn I need to do. They're high friction though. Alternatively I could do the 90º with bevels and make them easy to replace. Thoughts? Also anyone split a 20t single bevel? Ungeared or low geared power puller wheels + bewel gears + inertia + fast motor direction changes = broken gears. I suggest you to try to use normal gears if you can, bewel ones are quite weak. Quote
andythenorth Posted May 11, 2014 Posted May 11, 2014 (edited) Apologies for going off-topic - interestingly the L motor will shift the Power Puller wheels easily on a flat smooth surface, and will run over large obstacles if already moving fast. But on slopes the motors stall, and then the overload protection kicks in on either the battery box or motor (can't tell which). One motor per wheel. A stall on one seems to suck power from the other (same battery box). Not surprising - gearing is only 12:20. Need to rethink Edited May 11, 2014 by andythenorth Quote
Tommy Styrvoky Posted May 11, 2014 Author Posted May 11, 2014 Moved it over here! You will have a better chance to get an answer. Welcome to Eurobricks by the way! thanks Quote
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