base pin

base pin

[′bās ‚pin]
(design engineering)
pin
Mentioned in ?
References in periodicals archive ?
Next, with a rawhide mallet, or some other similar object, tap the wedge on the right side of the frame, and drive it through to the left side until it clears the cylinder base pin slot that it is wedged into.
As with all Sheriff's Models, the USFA version has the "black powder" frame, with the base pin held in place by a screw through the front of the frame, and they are traditional single actions which means you only load five rounds and keep an empty chamber under the hammer.
The Casull uses one of the simplest, most positive methods for anchoring the base pin imaginable.
Having taken apart dozens of cap-and-ball revolvers over the years, I "knew" the screw was there to keep the wedge (normally with a long trough milled in the upper surface) from being lost once it was free of the cylinder base pin.
The major difference between the 1900-era sixguns and the EMF reproduction is in the cylinder base pin sytem, which, unlike the older Colts, also serves as a hammer block safety device.
Some of these variables in producing an accurate revolver include placement and alignment of chamber pilot holes, chambers in relation to pilot holes, the cylinder base-pin hole and the two holes in the frame which accept the base pin, cylinder stop notches, the threaded portion of the frame and threads on the barrel, barrel centered in the frame, the cylinder bolt notches and the cylinder bolt itself and how they mate together, placement of the cylinder bolt in the window in the bottom of the frame, tension on the pawl when the sixgun is at full cock, and the chamber throats.
A rawhide mallet and a rod were required to free the carbon-caked base pin from the frame.
A Bisley hammer is fitted, the recoil shield and loading gate are scalloped to cut weight and give a classic appearance, an oversize locking base pin is installed and, for security and just plain good looks, a lanyard ring is added.
The one hang-up we both experienced was in removing the cylinder base pin from the frame.
This is made easy by the fact the cylinder base pin is spring-loaded and when pushed in at the front the base pin is unlocked and can be removed and the cylinder with it.
Colt introduced a frame wherein the cylinder base pin was secured by a transverse spring-loaded latch.
When a single action's cylinder doesn't fit the base pin correctly, it exhibits itself in several ways such as a pin jumping forward under recoil and/or allowing a lot of play in the cylinder.