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The revolutionary underlying principle was that advances in machine tool control that expedited the making of jigs were fundamentally a way to expedite the cutting process itself, for which the jig was just a means to an end. Thus, the jig borer's development helped advance machine tool technology toward later NC and CNC development. The jig ...
A horse wearing an English bridle with a snaffle bit, the end of which can be seen just sticking out of the mouth. The bit is not the metal ring. Horse skull showing the large gap between the front teeth and the back teeth. The bit sits in this gap, and extends beyond from side to side. The bit is an item of a horse's tack.
A curb bit works on several parts of a horse's head and mouth. The bit mouthpiece acts on the bars, tongue and roof of the mouth. The shanks add leverage and place pressure on the poll via the crownpiece of the bridle, to the chin groove via the curb chain, and, especially with a "loose jaw" shank, may act on the sides of the mouth and jaw.
A jig grinder is a machine tool used for grinding complex shapes and holes where the highest degrees of accuracy and finish are required. The jig grinder is very similar to a jig borer , in that the table positioning and spindles are very accurate (far more so than a manual milling machine or lathe ).
Gag snaffle Similar in shape to a snaffle, with a mouthpiece and a ring on either side. Each bit ring has two holes: one on the top and one on the bottom. Gag cheekpieces, made of rounded leather or of rope, are run through these holes. The end on these cheekpieces, after passing through both holes, have a metal ring to which the reins are ...
If the bit has a 1.5" cheek and a 4.5" lower shank, thus producing a 1:3 ratio of cheek to lower shank, while the ratio of the cheek to (upper + lower) shank is 1:4, and producing 4 pounds-force of pressure on the horse's mouth for every 1 pound-force (4 newtons per newton) placed on the reins.