Does Counterbalancing Weight Differ From Concrete Weight in a Spinning Mould?

[lwasmund]

I am forming a concrete utility pole centripetaly in the mould (lathe). I need to have it form with an aperature(box shaped hole). I need to place a box to form the hole for the aperature and it needs to be of proper weight. the weight the concrete would of been had there been no aperture. It is best if i place the box in without it being of the desired weight, and counter balance it on the outside of the mould. My question is would the wieght needed to counterbalance the pole when spinning need to be different then the aproximated weight of the concrete(403lbs). Since the weight is on the outside of the mould?

thanks

 

[lwasmund]

I understand a little about physics. My main study is civil eng. I am looking for the factor that I can add to my equation to calculate for the difference with the counterbalance being on the outside. think of a ball on a string. except no the ball isn't on a string but held in orbit by the perimeter. How much mass/weight do I need to counterbalance. When it is to counter 403lbs of misplaced concrete.

 

[oswaler]

I would first clarify that the term "centripetal force" refers to the force that keeps an object moving in a circular path. In this case, the centripetal force would be provided by the lathe as it spins the concrete pole. The weight of the pole and the box would also play a role in determining the centripetal force required to keep it in motion.

To answer your question, the weight needed to counterbalance the pole when spinning would indeed be different from the approximated weight of the concrete. This is because the weight of the box and its contents would also contribute to the overall weight that needs to be balanced. Additionally, the placement of the weight on the outside of the mould would also affect the distribution of the centripetal force.

In order to ensure the stability and balance of the concrete pole while spinning, it would be important to accurately calculate the combined weight of the pole and the box and adjust the counterbalancing weight accordingly. This can be done by considering the dimensions and weight of the box, as well as the distribution of the weight on the outside of the mould.

Overall, it is important to carefully consider the weight and distribution of all components involved in order to achieve the desired result of a properly formed pole with an aperture.