The hole is a slightly too big for the motor's shaft. I thought about hot gluing them together.
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1$\begingroup$ ..and please, don't really glue them toghether. Sinc you are going to fly a quadrotor it is likely to collide (sometime) against a wall or a door. If you break the blade or slightly damage it, then you must change motor + blade. Bye $\endgroup$– DaveDec 30, 2014 at 22:47
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$\begingroup$ That looks like a propellor. From your title I thought it might be an axe. $\endgroup$– Pete KirkhamDec 31, 2014 at 22:18
1 Answer
Which piece is the robot? This is not a robotics question.
I have to assume since you are asking a question that shows a lack of fundamental mechanical understanding, that for its intended use, precision is not a requirement.
In that case, wrap the motor shaft with some tape until you have the tightness you are looking for.
A more appropriate fix would be some form of adapter.
For any real application, the propellor size is almost certainly incorrect for that motor. A gear reduction unit is needed.