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Hello!
I need all possible help. With my own convolutions, something does not work out)
The eldest son (5 years old) on NG 2019 made an expensive gift. Cool typewriter on the management. But its quality is poor and testing this car in the apartment, the wheel fell off. The disappointment of his son knew no bounds.
The son asks the "almighty" father to fix it and does not understand why the "almighty" father does not repair it. And I have only one idol.
Try cold gluing to the shaft from the motor of the nut to the size of the inlet in the wheel, since the size practically matches the number 3 nut, but this idea does not inspire confidence in me, because if it still falls off, the machine accelerates to 60 km \ h, there will be problems with the remains of cold welding.

Or grab the nuts to the shaft by welding, but how to do this close to the plastic parts of the housing auto, I have no idea. Argon seems to be possible, but I don’t know for sure.
Thought to disassemble the machine and think about a new chassis, but this is definitely not for my mind)
All the same, the rest of the wheels can also fall off, as powerful motors just wipe the hitch ribs in a piece shit plastic.

There are no other ideas. I’m sure there are Knowers!
He planted it on an epoxy, apparently cracking and popping up.

In the last photo, the most problematic part, which is rubbed inside.

I'm not a writer, if anything, sorry) Yes, and here is not a literary circle))
All the best!








While writing, not without outside help, the idea came to insert a pin through a white plastic part and, accordingly, a motor shaft ... What do you think?
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43 commentary
Raf 0
Reply To quote A complaint
Cut the thread on the axis and screw a long nut onto the axis using the thread lock. It is better to take the lock in red, it will surely tighten. Well, and put your wheel on the nut. Judging by the photo, there’s just a hexagon. Take the nut longer than the axis so that it remains a part of the thread on the nut for the bolt securing the wheel from releasing from the nut. and you will be happy.
+1
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and insert veneer ...... ku

..better pin ..... t, or splint .... t. )))))
Guest Herman 0
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To purchase a hexagon ... drill a hole with a diameter from the end along the main axis of the hexagon ... so that the drive shaft of the wheel fits tightly ... first drill a hole on the edge of the hexagon in the center where the wheel drive shaft will be located ... . cut off the hexagon in size it will be a kind of coupling after .... when you dock the drive shaft with the coupling ..... in the place where you drilled a hole, drill and insert again veneer ...... ku
Author 0
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I’m ashamed to admit, but I don’t understand how to implement this. pardon
I will find the hexagon, cut to size.
On the one hand, you need to make the hole thinner than the shaft, on the other, a threaded hole. Put on a hot ... it doesn’t reach me.
If it doesn’t work out with a cotter pin, I’ll be wise with a hexagon.
Author 0
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Very thin shaft.
But with the preparation (file, core and oil) did not try ... I wanted a quick one))
I'll try on to the mind your advice!))
0
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It seems like a cotter pin will not work ...
Have you tried to experiment with the wheel hub?
+1
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The screwdriver can’t even start, the drill jumps off the shaft.

Once or twice, hold a file. then, picking up the stand, in this place to tilt. In punching - a drop of oil. We drill with a strong clamp and at very low speeds. (This will not always succeed, so it’s better not to press on the “trigger” and hold it, but to drill intermittently, with gentle pressing and releasing. Periodically add oil.)))))
Oh you, Bozhechki! ... Well then to drill that? !!!!
0
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goshad, and this junk goes 60 km / h, who told you that? In the toothbrushes, motors are even more powerful.
Author 0
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It seems that it will not work with a cotter pin ... Or else it is necessary to clamp the shaft in a vice and drill it with a machine.
The screwdriver can’t even start, the drill jumps off the shaft.


Author 0
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Very grateful to everyone for their help!
There is enough information, you need to digest it and translate it!)
Guest Eugene 0
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Yes, and from the rotation of the axis at startup will not save.
Author +1
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Quote: Tox258
Not without outside help, the idea came to insert a hairpin through a white plastic part and, accordingly, a motor shaft ... We need to find such a drill and a hairpin in the form of a carnation. These are trifles ...
What do you think?

In the message above, I meant the same thing. It’s just that my technical vocabulary did not allow me to express myself as competently and readily as you did)
Thank you

This option seems to me the most suitable, except that the axis may be too thin to drill holes in it. I’ll look for drills of the right diameter.
Guest Eugene 0
Reply To quote A complaint
There was no written welding. Put on a hot one to heat the part, the hole will expand, put on the axle. When cooling, the part will shrink and hold tight. Only difficult. A hole must be made of such a diameter so that it doesn’t put on a cold one and expands to the required diameter when heated, it is difficult to do this with such dimensions of parts it is hundredths of a millimeter, and on the other hand, you will need to cut the thread to fasten the wheel.
Guest Eugene +1
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The work is delicate, but it can be done, are the possibilities possible? It is necessary to drill a hole perpendicular to the axis and, as accurately as possible, through the center. Next, we remove the hexagon from the wheel and drill the same hole in it, perpendicular to the axis of rotation. If the hexagon is worn with a backlash on the axis, then you need to put it on glue, for example poxipol (a kind of epoxy, but better). They spread it, put it on the axis, combining the holes and until the glue has frozen, we insert the cotter pin from the piece of the same drill into the holes.When the adhesive hardens, there will be no backlash in the connection, and the cotter pin connecting the two parts will take on all the loads from turning the axis in the hexagon and from flying it off the axis. A wheel dressed in place plus glue will not allow the hairpin to come out. By the way, it will be necessary to do so immediately with all the wheels. Go ahead. Yes, most likely this axis is not an engine shaft, a plastic gear is cut on it inside, which can also crank, so I advise you to open it and see the possibility of splinting and it. I don’t advise drilling immediately in the assembly, easily having passed the plastic, it will be buried into the axis, while the metal hole will be drilled in the plastic, it will break. So we got to the metal, the plastic was removed, at the mark from the drill we drill an axis, then we put on the plastic again and already matching the holes we finish through, then the holes would match exactly. Good luck.
Guest Valery 0
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Having set the bronze hexagonal bushing on the axis hot, you can then put the bronze hexagonal bushing on epoxy glue in the wheel.
Author 0
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Not too much) I was not interested in mechanics))
Later it dawned on me about the hexagon nea
Now it comes to how to do it all)
0
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keep it so steady until it freezes
-the thing is that it may not freeze. Sometimes plastic cools and becomes "soft"
0
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Finally, the epoxy does not stick to plastic. 4 wheels driven nothing, then mona with two cars to make rollers and fly through the streets at a speed of 60 km / h. Here's the wheel still attached: to fix the wheel with cardboard with foil, and heat the plastic hole with a hairdryer so that it would almost melt, then immediately clamp it into the drill chuck. With this, the hole will narrow and then tightly fit on the axis, keep it so even until it hardens. Well, or else to dissolve part of the plastic in chloroform and pour it into the hole of the wheel, though then you also need to hold it for a while
+1
Reply To quote A complaint
What kind of welding can there be? !!! Thin all! (I correctly understood that the axis is 2.5 mm ???) The hub is made of polyethylene, so the epoxy will not really work ... Like glue ...
Actually, the proposed method (with a hexagon), apparently, will be the best ...
Sorry, but I see your "trouble with the mechanics," so I’ll explain ... (Sorry if this is too much))))
Perhaps you did not understand about the hexagon. You can find it in cheap sets of hex keys. (L-shaped ones).
0
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Well, the person pressed SHIFT - it turned out No. 3 xaxa
0
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she is on an unsupported mover !!! it explains everything
0
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Generally without leading? scratch
0
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A check is optional. Read the Consumer Protection Act. But without a check, it’s much harder to achieve something.
0
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If so, then it’s definitely not in the place where you indicated the arrow in the photo, but rather, at the very edge of the shaft. But if, over the entire remaining area, the sleeve will scroll on the shaft, then this pin will bear the entire load.
pogranec really suggested the best budget solution, pick up the hexagon, drill a hole a little less than the diameter of the shaft, and put it on a hot one. Chinese plasticine hexagons in each "three-ruble note" ("all for ** rubles") are sold.
+3
Reply To quote A complaint
How to plant for hot welding


He meant to put a new sleeve on the hot axis, when you warm up the sleeve well, it expands, sit on the cold axis, it cools and "sits down". So often metal gears on small motors are planted. Probably the best solution.
0
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At the request of "spare parts for radio-controlled cars" popped up a bunch of sites. I think you can find such a detail there. Or on Ali.
0
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And what's so complicated? If you do not find this, take a little more and sharpen the edges. By the way, there is such a plastic that “melts” in water and anything is molded from it, then it freezes in the air. Yes, and a lot of glues. For plastic special, anaerobic, etc.
Author 0
Reply To quote A complaint
Not without outside help, the idea came to insert a hairpin through a white plastic part and, accordingly, a motor shaft ... We need to find such a drill and a hairpin in the form of a carnation. These are trifles ...
What do you think?
Author 0
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You are not mistaken.
I know that the remaining wheels will fall off. Therefore, I wrote here)
Author 0
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60 km can of course just be a marketing move, but it is really very fast!
The shaft is definitely not hardened! The usual cheap alloy.

I also thought about replacing the entire axle (chassis), but I have not yet disassembled it, and I think this shaft comes straight out of the motor ... So it will not work. But you have to make out!

I wrote about the epoxy.
Author 0
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She certainly pulled out.
I think it’s going to be the most difficult to pick a facet)
Like planting for hot welding ... Well it will melt the plastic.
Author 0
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If this is important, then yes, you are right!
Author 0
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In the description, I wrote about the epoxy, immediately flies off ...
There are all 4 wheels driven.
Author 0
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Good question. Maybe it didn’t end, but the check was hardly preserved ...
+1
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60 km / h for such a machine goes
This is somewhere 17 m / s, how is it to be thrown? scratch
+1
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If I’m not mistaken, is it a transformer that changes the clearance? It’s sad to look at the quality of such “not cheap” toys. Well, the Chinese ...
With such a wretched performance of these toys, with a thin axle and a huge wheel, it is difficult to advise. This is a clean factory jamb, only to modify the file. As advised, roughen the shaft axis with a file, roughen the seat, if it's cheap.
One way or another, to develop 60 km / h with this design ... this is from a series of Chinese speakers with a diameter of 10 cm and a power of 100 watts)
IMHO, all this is garbage. The second wheel will fall off next, or the gear will fly out, or something else. I am not a pessimist, these are the realities of Chinese under (d) Christmas trees. Engage in modeling, all the best)
0
Reply To quote A complaint
60 km / h for such a machine goes 140 r / s wheels! Or a speed of almost 20 m / s, isn’t it too much? Such cogs do not hold torque at startup. From what metal shaft? If this is hardened steel, welding is not suitable. I would further disassemble it can change the entire axis to a longer one. Take a picture of the shaft close! And it’s not clear what is on it. As an option, fill everything with epoxy first by installing three pins on the axis parallel to it with pressing them into the wheel
+1
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Well, as an option, if the loads are low, you can try to put on the shaft shrink, and already put the wheel tightly on it.
+2
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As I understand it, the plastic seat simply erased and the metal shaft with slots scrolls. If this white part is pulled out, then you can remove it. Choose the diameter of the granite. Drill a hole slightly smaller than the diameter of the axis and set on a hot one. Then cut the excess and install the wheel. You can also find where you have a 3D printer and order a part there, or carve it from plastic yourself. And if glued, it is mandatory with a filler, and not on bare glue.
+1
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Quote: Dmitrij
But on the shaft you need slots, if not, grind the grinder.
Grinder? On a diameter of 2.5 mm? What file did not please?
Quote: Dmitrij
It looks like a driven wheel
It is leading:
Try to glue cold welding to the shaft from the motor


It seems to me that it is necessary to press a metal (for example, bronze) sleeve into the hub, and glue the shaft into it with epoxy, if possible, with a key.
+1
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matches nut number 3
Maybe M3?
+1
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On the epoxy sandalwood, not going anywhere. But on the shaft you need slots, if not, grind the grinder. It looks like a driven wheel, it’s a very weak mount
0
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Is the warranty over?

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