how to find out bore size of barrel

[Ahdinko]

Or the quick cheap way
Find a friend with a barrel kit, put a few paintballs down your barrel, and then find an insert of his that matches the tightness of your barrel.

 

[Tom Allen]

ok who's the quickest to explain the vernier principle

 

[mikey601]

VERNIER

Sometimes the marking on the thimble of the micrometer does not fall directly on the index line of the sleeve. To make possible readings even smaller than thousandths, an ingenious device is introduced in the form of an additional scale. This scale, called a VERNIER, was named after its inventor, Pierre Vernier. The vernier makes possible accurate readings to the ten-thousandth of an inch.

Principle of the Vernier

Suppose a ruler has markings every tenth of an inch but it is desired to read accurately to hundredths. A separate scale (fig. 6-3) is added to the ruler. It has 10 markings on it that take up the same distance as 9 markings on the ruler scale. Thus, each space on the vernier is 1/10 of 9/10 inch, or 9/100 inch. How much smaller is a space on the vernier than a space on the ruler? The ruler space is 1/10 inch, or 10/100 and the vernier space is 9/100 inch. The vernier space is smaller by the difference between these two numbers

 

[Dark Stranger]

http://hyperphysics.phy-astr.gsu.edu/hbase/class/phscilab/vernier.html



Edit:

Mikey beat me to it

 

[mikey601]

What do i win?

 

[Lump]

some love this weekend

 

[mikey601]

some love this weekend

Get your own back time is it?

 

[Tom Allen]

VERNIER

Sometimes the marking on the thimble of the micrometer does not fall directly on the index line of the sleeve. To make possible readings even smaller than thousandths, an ingenious device is introduced in the form of an additional scale. This scale, called a VERNIER, was named after its inventor, Pierre Vernier. The vernier makes possible accurate readings to the ten-thousandth of an inch.

Principle of the Vernier

Suppose a ruler has markings every tenth of an inch but it is desired to read accurately to hundredths. A separate scale (fig. 6-3) is added to the ruler. It has 10 markings on it that take up the same distance as 9 markings on the ruler scale. Thus, each space on the vernier is 1/10 of 9/10 inch, or 9/100 inch. How much smaller is a space on the vernier than a space on the ruler? The ruler space is 1/10 inch, or 10/100 and the vernier space is 9/100 inch. The vernier space is smaller by the difference between these two numbers

But could you read it

 

[mikey601]

Well yes i can read it, understand it, no. but i can read it. I could also sell you one aswell

 

[Tom Allen]

I know, they are a pain in the arse to read, thank god for digital verniers.