Moved from Revolvers 45 to Present section

[Scotter260]

I have two questions regarding endshake and timing and believe I'm using the proper terms but please correct me if I'm not.

First question is how do you check for endshake? I checked my 65-2 today at lock-up and the front of the cylinder moves slightly from side to side with the crane (term?) moving slightly away from the frame. Didn't check front to back as I just read to check that also.

Second question is do Smith .22 revolvers have different timing than larger calibers? The reason I ask is that sometimes when I pull the trigger on my K-22 CM the cylinder turns with the trigger pull up to a point and then spins ahead into position while the trigger seems to catch towards the end of the stroke. It feels like staging but the gun is doing it, not me. (I don't stage either, I try to "roll" it through from beginning to end.) Not sure if this is a timing issue.

Thanks for any replies,
Scott

 

[Scotter260]

I have two questions regarding endshake and timing and believe I'm using the proper terms but please correct me if I'm not.

First question is how do you check for endshake? I checked my 65-2 today at lock-up and the front of the cylinder moves slightly from side to side with the crane (term?) moving slightly away from the frame. Didn't check front to back as I just read to check that also.

Second question is do Smith .22 revolvers have different timing than larger calibers? The reason I ask is that sometimes when I pull the trigger on my K-22 CM the cylinder turns with the trigger pull up to a point and then spins ahead into position while the trigger seems to catch towards the end of the stroke. It feels like staging but the gun is doing it, not me. (I don't stage either, I try to "roll" it through from beginning to end.) Not sure if this is a timing issue.

Thanks for any replies,
Scott

 

[john traveler]

Scotter,

The S&W K frame actions are identical in rimfire and centerfire. Timing, lockup, hand/ratchet interface, endshake, etc are the same. What you are feeling is the difference in weight (momentum) between the moving rimfire and centerfire cylinders. The rimfire cylinder, having more steel with the smaller chambers, tends to continue in motion until lockup. The centerfire cylinder, weighing less with larger chambers, has less tendency to do this. What you are feeling in the trigger is indeed staging, and can be felt more readily in the rimfire guns and also in centerfires with actions smoothed out.

Checking for endshake is simple: using an auto mechanic's feeler gauge measure the maximum and minimum barrel-to-cylinder gap. The difference is endshake. Ideally, this will be around 0.001", but many good functioning guns will have more than that. Centerfire B-C gap should measure somewhere around 0.005" to 0.012" maximum. Rimfires should a couple thousandths less than those figures.