Ok, gonna show my ignorance here

[Paul]

Been a loooong time since math in school, and a little embarassed to have to ask this. If I have a hole I want to line with felt, what is the formula for figuring the length of felt to cut? Thanks guys.

[Norvin Gordon]

If memory serves me right.......

c=(pi)x d or 3.14 x dia.

[-MIKE-]

I always remember the difference between circumference and area by thinking of the Ty-D-Bol Man. The Ty-D-Bol Man goes around the bowl (circumference). Ty-D rhymes with Pi(d)

[Existential Angst]

Felt has thickness, so technically, the calc of the hole won't be correck, altho the diff could be negligible.

Another way to get a perfect fit with no calc at all is to cut it a bit long, wrap it on the hole, and just cut the overlap (winding up with two drops), for a perfect fit.

[Bill]

If you remember that there are 2*Pi radians in a circle, it also gives you C=2(Pi)r, or C=(Pi)d.

If you've had calculus, thinking of the area of the circle as the collection of "skins" having thickness dr, you can integrate C dr over the interval [0,R] to get A=Pi R^2. At least, that's one way. I just mention this for the readers that are math fans.

Bill

[Robatoy]

Did you know they eventually, after pleading and begging, put lemon in the Ty-D-Bowl, mon....? *cue some steel drums, mon*

[willshak]

A poor farmer worked long and hard to send his eldest son to college. He looked forward to saying with pride that the family finally had their first college graduate. Son grew up, went off to college. His father continued working hard to pay the tuition. Four years later, son came home with a diploma. Excited to know what the son had learned, his father asked him to tell him something. Son replied "Pi r2," which the father heard as "pie are squared." Shocked and angered, the poor old father tore his straw hat off his head in disgust, threw it onto the ground and yelled at his son: "You dingbat! Pie are ROUND...cornbread are square!"

[Sonny]

2 pi lemons are round. 2 lemon pis are round.

I learnt that on the farm!

Sonny

[marc rosen]

Are you saying you never felt the inside of a hole? =20 Marc

[-MIKE-]

What does that have to do with a toilet?

[Robatoy]

Correct me if I'm wrong, but I have a feeling this thread just went off the rails.

[k-nuttle]

I think you are right, but when the question was asked the direction was inevitable.

[Robatoy]

It does make you wonder what he is making..........

[Leon]

Well technically the thickness of the felt has noting to do with the calculation. He wants to line the hole with felt. That distance is what you will need to use to cut the felt. If he cuts the felt longer than the perimeter of the hole it will not lay flat. If he cuts the felt shorter than the perimeter of the hole it will be too short. The only length that is important is the surface. Felt thickness will compress.

What if the hole is 1/2" in diameter or smaller?

[Bill]

I was just offering another mnemonic device... I have nothing against toilets.

[willshak]

If - he measures the inside diameter and uses the formula for the inside circumference to get the length of the felt.

[willshak]

except your ass. :-)

[Bill]

Which reminds me, I've been meaning to put some felt on my toilet...

[willshak]

Don't they still make those soft padded toilet seat covers?

[Bill]

Yeah, you mean the ones that keep the seat from staying up...lol