tamiya 3 speed truck gear box

thingiverse

update 4/1/2020 changes i have made the inner shafts are now 5 sided i did this to get more meat on the frist drive gear also the shafts are hollow to allow a 2.5mm hanger to be used as a metal inner shaft i have changed the shift shaft to metal 2.5mm hanger with a locking spacer in the middle the lock spacer can be used on both ends as stops like the e clips but find it is not necessary glue all the parts on shaft 1 this will make this more solid with the metal hanger in the center glue the ends of shaft 2 end 1 and end 2 if you don't there will be enough play for middle gear to skip also the box seperator bars are also hollow to allow for a metal hanger insertion the only ones that nead it are the 2 top that hold the shaft 1 suports to help from middle gear skiping i have also made this gear box to be used with 540 and 550 motor this is because i am using the 550 in the tamiya truck and this will allow people to upgrade to the new 3 speed with out the now what the hell am i suposed to do with this other motor or there is no way in he double toot picks i am buying another motor to tell you the truth i like the 550 setup better the 540 motor is just to fast but the 550 now has power to pull but not to fast to drive indoors update this gear box now uses 6700zz bearings i have added diagram stls and picture diagram of shaft 1 and shaft 2 the shift shaft refer to one of the completed stl the combined print stls are set so that they 1-xx number 1 is closest to the motor on both shafts two hints print everything on rafts and take a marker and label the parts while they are still on the rafts also use white grease on all the bearing surfaces and gears while you are putting it together do not use any other kinds of oil abs and pla absorb any oils you try to apply i did not do this as i was printing removing adjusting reprinting getting all parts to mesh properly so now i have to take the whole thing apart again to get white lithium on the bearing surfaces if i have totaly confused all of you i consider my day complete just kidding if there are any questions on this gear box do not be afraid to ask it is extremely complicated i have made this so that there are not as many parts but still ???? ok so i have ben playing with my tamiya truck and the one thing missing in my tamiya king hauler download is the single speed gearbox while it work at mid range it does not have the extreme power of the tamiya gearbox so i have ben wanting this gear box for some time to put into my uploaded truck so hear it is i am going to use this trany in the next truck which will be a heavy wrecker triple axle rotator and i wanted the most powerful trany i can put into it this does seem to work realy well but the shift arm you will have to be creative to find the right spring weight i have looked through my springs and have found some springs that came off of one of my g scale train engine it is larger round but the length is correct and it is light enough to be shifted with a servo and not to powerful enough to bend the shift arm it is fine balance the shift arm is made for e clips i do not have any at the time so i just used some wire to wrap at the e clip positions at this time i do not see any way of making this with bought bearings and still be able to be 3d printed but am considering figuring out a way ??? this was the most complicated gear box i have created to date hope i do not have to do any more like this it was a nightmare trying to figure out how the thing worked with out tearing apart my very expensive truck