Butt Joint Gap Or is it called Barrel lug/ frame Gap?

[45D]

Well technically end shake is a term used for revolvers with bushings on the end of the cylinder and is a separate measurement from barrel/cylinder gap which will be bigger/wider than true end shake gaps.
End shake gaps set up with cylinder bushings typically are no more than .001 often half that where as the smallest barrel cylinder gap I have ever seen is on Dan Wesson smokeless cartridge revolvers set at a very tight .002.
Also barrel cylinder gap is almost never equal distant at 3,6,9, and 12 o'clock (especially with open frames and arbors) usually being tighter or looser at 6 and 12 o'clock which has a lot to do with if they shoot high,low or off to one side.
This is why when a very large gap has to be tightened up than the lower lug (pivot point) needs adjusted as well to keep the barrel/cylinder gap as equal distant as possible as the wedge draws up the barrel on arbor to the frame.
The wedge is so powerful in it's cam action and off set from bore line that it can actually pull the muzzle out of line if the arbor end is not fit up tight in the well. So the arbor should fit the end of the well and the lower lug should butt up tight at the same time ideally leaving the barrel cylinder gap equal distant around it's perimeter at what ever gap one prefers.
I personally always prefer to set the gap at the top a bit tighter than the bottom as when the ball hits the forcing cone and the arbor radial tolerance slack is removed the gap will be more coaxial/equal distant (in line) with the bore.

Technically, "endshake" is fore and aft movement of the cylinder . . . whatever revolver it's in. GAP, is determined by the presence of a bushing or gas ring. Therefore, technically, the measurement of the "gap" is taken with the cylinder pushed forward. Since there is no bushing or gas ring available normally on an open-top platform revolver, the gap (a defined opening) will be "0". So, on an open-top platform, all you really have is "endshake".
On a Richard’s Mason or '72 Open Top, there's a spacer and a gap can indeed be "dialed in" with zero endshake. With Jedi Knight and Tame Bill's revolvers, there was also an issue with "headspace" clearance from the factory (along with short arbors and all the other "shortcomings"). Needless to say, their revolvers run like "Outlaw Mules" now!!!

As far as the chamber/forcing cone/barrel attitude is concerned, once the arbor situation has been dealt with, the forcing cone can be addressed. The most important factor is the assembly will be the same each and every time so that an accurate loading/ result can be achieved and maintained.

Mike

 

[Curtis Lee]

MIke I am searching Bore cylinder alignment. ANy thoughts?

 

[M. De Land]

Technically, "endshake" is fore and aft movement of the cylinder . . . whatever revolver it's in. GAP, is determined by the presence of a bushing or gas ring. Therefore, technically, the measurement of the "gap" is taken with the cylinder pushed forward. Since there is no bushing or gas ring available normally on an open-top platform revolver, the gap (a defined opening) will be "0". So, on an open-top platform, all you really have is "endshake".
On a Richard’s Mason or '72 Open Top, there's a spacer and a gap can indeed be "dialed in" with zero endshake. With Jedi Knight and Tame Bill's revolvers, there was also an issue with "headspace" clearance from the factory (along with short arbors and all the other "shortcomings"). Needless to say, their revolvers run like "Outlaw Mules" now!!!

As far as the chamber/forcing cone/barrel attitude is concerned, once the arbor situation has been dealt with, the forcing cone can be addressed. The most important factor is the assembly will be the same each and every time so that an accurate loading/ result can be achieved and maintained.

Mike

The very reason it is a differentiating term is because while included in barrel/cylinder gap with either design of bushing, gas ringed or bushing-less cylinder it is a distinctly separate tolerance applicable to specific design.