Hi,
I'm making my own small rc car with a 3D printed chassis.
So I can't insert a DC motor in a prebuilt gear system on a chassis, I have to insert a gearbox.
I have all the hardware/software interface but I miss some mechanical parts.
I'm looking for:
a kit with a DC motor and a gear set (with almost no reduction) to transmit the motion to the wheel shaft (diameter of the shaft depending on the set I find). In practice a gearbox without reduction.
a steering kit to connect to a micro servo
In practice all the mechanical parts to be mounted on a 3d printed chassis and controlled by an Arduino board.
All suggestions are well accepted
Sorry, a "stirring kit" doesn't make much sense. Do you perhaps mean steering (turning left or right)? If so the simplest is just to mount the front axle directly on the servo. It's crude but it can work for very small cars.
But perhaps more details of the size and layout of your "3D printed chassis" would help us understand what you need.
jremington:
A shaft coupler is a "gearbox without reduction".
Get them at servocity.com, which is a great source for robot parts.
This is not exactly what I was looking for, I can't find a coupler with the motor shaft entering and the long wheels shaft exiting.
Maybe it's my fault.
slipstick:
Sorry, a "stirring kit" doesn't make much sense. Do you perhaps mean steering (turning left or right)? If so the simplest is just to mount the front axle directly on the servo. It's crude but it can work for very small cars.
But perhaps more details of the size and layout of your "3D printed chassis" would help us understand what you need.
Steve
Of course it was "steering", I wrote fastly from the smartphone yesterday.
For the scheme I sketched something some weeks ago but the size depends of course on the mechical parts, that are the most difficult parts to be found, indicatively it should be like 15-20 cm long.
As you can see from the scheme I was searching for the green mechanism.
Then I will decide the board (now I'm thinking about the Lolin D32 with BT support) or arduino nano/micro with some BT/Wifi shield. It's almost the same for me, the arduino part is the simplest one.
The 3d printed chassis is to be modelled once I have all the pieces to put together, with their exact space occupation.
Bjack795:
This is not exactly what I was looking for, I can't find a coupler with the motor shaft entering and the long wheels shaft exiting.
Maybe it's my fault.
I thank you very much but I'm really astonished.
These are all very complicated solutions for a simple problem that is transmission from a motor to the wheels axle.
It's incredible that no one is producing a gearbox with ratio close to 1.
There are commercial gearboxes for every ratio lower than 1:12 that are too slow and no gearbox of that type for the simple motion as it is.
It's incredible that no one is producing a gearbox with ratio close to 1.
I don't think you have looked very hard, but even if true, that would not be at all incredible.
How many people do you think would want to buy one?
Start thinking like a manufacturer, who has to pay someone to design, build and test gizmo prototypes, then make, market and sell tens of thousands of gizmos to earn any money at all.
I have used a lot of tamiya mini4WD when I was younger but the gear stuff is mounted on the chassis and I can't do the same because my tolerances in 3D printing doesn't allow this precision or I can't trust completely my ability in constructing the gears.
I mean that they produce some kits with interchangeable ratios but a ratio of 1:12 is 10 times less rpm, so it's 10 times slower (more torque of course but not anybody is looking for high torque).
In my opinion is not so stupid to think an easy way to connect a motor and an axle, on YouTube I saw some people putting the axle directly in the motor shaft, pulling out the original shaft.
This creates some problems but it means that some people are looking for a solution like this
Bjack795:
on YouTube I saw some people putting the axle directly in the motor shaft, pulling out the original shaft.
This creates some problems but it means that some people are looking for a solution like this https://youtu.be/IzuzqiTT4D0
It is very unlikely that a small DC motor can drive wheels of a small car directly without reduction gearing. Those little motors run at several thousand RPM which is much too fast.
Your video shows an interesting modification that I might be tempted to try for other purposes. Be aware, however, that even the very cheap motors are likely to have a polished hardened steel shaft and a replacement un-polished un-hardened shaft may wear out itself or the bearings very quickly.
Robin2:
It is very unlikely that a small DC motor can drive wheels of a small car directly without reduction gearing. Those little motors run at several thousand RPM which is much too fast.
Your video shows an interesting modification that I might be tempted to try for other purposes. Be aware, however, that even the very cheap motors are likely to have a polished hardened steel shaft and a replacement un-polished un-hardened shaft may wear out itself or the bearings very quickly.
...R
Ok let's do some computations.
Taking this std motor
