"U" joint pic

[sawhit4]

hey do any of yall know if this will work for a U joint? i saw one make like this on a wrench and i just made a model of is out of an old dowel and a small piece of brass. the one i would use in my truck would not be wood i just used wood cuz i didnt want to waste my round metal on something that i didnt know if it would work.

[Timbo337]

It may work, but I don't think it would work efficiently. The two axes of rotation do not intersect, they are far apart which would make the joint bumpy when you spin it at an angle. It would be better if your two pins (nails) were on the same plain. I know you're not going to understand what I just said, because I barely do but if you look at other u joints, I think you'll know what I mean.

[sawhit4]

i get it. i saw this one on a wrench in my dads tool box. i found some boat U joints off of tower hobbies that i might use

[killer]

:ö: if you are going to use those u-joint on 1/87 scale... that'll be quite big u-joint for a micro scale truck!

-æ

[sawhit4]

the real u joint would be smaller and im not making a 1/87 truck. somewhere around 1/30

[Timbo337]

killer, what ujoints did you use on your 1/32 trucks? Or did you make those too?

[killer]

:ö: yes, those u-joints are handmade!... i can't find small enough and strong enough to withstand the abuse of micro off-roading, so i build one my own out of steel shafts!

-æ

[Timbo337]

You made those?!? They look very professional! Do you have a tutorial on making them? Thanks

[sawhit4]

i don think he has one but it would be very helpful if he would. i know i would use it.

[killer]

:ö:those u-joint? ei i'm glad you liked it!... tutorial?!.. a steady hand and 200% patience! no kidding!, i did not make a thread on how to make one because i just copied a 1/10 scale u-joint and make into as small as my hands can make... but the smallest one used on 1/87 is my own design and still has pending patent, so i might as well keep it for myself at the moment

-æ

[Timbo337]

Ok, so I think you use tubing on the 'outside pieces' pf the joint, but I have no idea how you would make the center piece that does all the work, sooo....whatd you use to make that center piece?

[killer]

:ö: as for the "outside pieces" yes, it's easier to make a yoke if you use a tubing, but on my trucks i curved it out of a solid steel shaft using handheld drill, as for the + in the middle, what you can do is use a 1mm brass/ steel tube drill 0.8mm hole on its side so when you insert a .8 steel/brass rod it would form the +, now cut a small solid square brass/steel that fit in the middle of the yoke, then drill 1mm on one side and drill another .8mm hole on the other side, drilled holes should intersect each other. now, you should be able to push the 1mm rod inside it and remember that you drilled a .8mm size hole on its side?, this is where you slip in a .8mm steel or brass rod, and the finished product should look like a cross with a box in the middle of it, that's how i created the crossjoint.


-æ

[Timbo337]

And thats for the 1/87 joint? Sounds really hard. I don't think I can even buy metric drillbits here in US.... but I'll look

[sawhit4]

hey timbo337 are you making a 1/87 or bigger? i have been working on my 1/30ish car today and i have made a servo esc with a bigger motor but when i hit the throttle both the steering servo and the motor turn. i am waiting for the batteries for my pack to charge cuz i think that might be the problem

[Timbo337]

Are you using pistol grip radio? Make sure they are plugged in right(the servos) I think channel 1 is throttle for pistol radios. Also make sure you don't have any mixers turned on on your radio, those usually combine the input from two channels, and would make two servos turn at the same time.

Oh, and I'm making a 1/87 right now. After I get some real electronics for Christmans, I'm going to make another from a Man 5T, and then maybe a 4wd, 1/32 or 1/87, dunno yet.