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Pastimes : Don't Ask Rambi
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To: JF Quinnelly who wrote (16247)1/8/1999 12:29:00 AM
From: Jacques Chitte  Read Replies (1) of 71178
 
For small arms, there are three ways to rifle a barrel.
The oldest method is to cut the rifling. After the hole is drilled and reamed with specialized tools - a long cutting bar called a broach is inserted and drawn through on a helical path. Each time the cutter is advanced a ten thousandth. Twenty to fifty passes later, a groove is carved. Then the barrel is rotated sixty or ninety degrees - and the process is repeated.
Some companies still offer broach-cut barrels.
The second way is button rifling. A reverse cast of the bore profile is machined in some very hard material, typically tungsten carbide. This is then drawn or pushed through the bore in a single pass. Very quick and leaves a finished bore surface every time. Not so easy to get a consistent twist rate though. Most premium aftermarket barrels are button rifled.
The third way to make a rifled barrel is to cold-forge (hammer) a thick steel tube onto a cast of the bore - a mandrel made of tungsten carbide. The big rifle makers pretty much all use this approach.

Field pieces have many deep grooves. I saw a three-inch gun with about thirty grooves a good eighth of an inch deep. This requires a large soft driving band to surround the projectile.
Poli-Grip or Skippy straight from the frij should work with gerbils.
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