This experiment was first done in the 1850’s by Léon Foucault. At the time it required the finest scientific instrument makers in Paris working to Foucault’s specification to create the experiment. It was a feat of accuracy for its age. As soon as his experiment was published it was copied around the world by like-minded scientists and instrument makers in the major cities of the day. It is a lot simpler now but requires attention to detail, good mechanical and scientific understanding.

 

Precise machining of parts is no longer an issue. Friction still is a problem and is just as much a problem as it was in the 1850’s. Fortunately good materials are now easy to come by but the friction is usually the common problem repeating the experiment today.

 

A small gyroscope like the super gyroscope can produce a few hundredths of a gram of force over a few seconds, this is plenty to rotate the gimbals and feels like quite a strong force in human hands.  

However over minutes, that is hundreds of seconds. Divide a few hundredths of a gram by a few hundred seconds and you have around 1 gram or so of force. Actually quite likely only a fraction of a gram for most experiments. Imagine the gyroscope providing just a fraction of gram of force over a prolonged period.

 

The gimbals just have metal to metal joints which cause too much friction. You need to be able to blow on the gimbals and it rotate with the force from the air.  Foucault used fine silk to suspend the gyroscope reducing friction. 

 

The gyroscope disk is well balanced but the metal frame around it is not perfectly symmetrical and weighs more on one side. Again this needs a solution.

 

All those things need to be fixed in order to reproduce Léon Foucault experiment with a modern gyro.