Why is frame material missing on my J frame?

[1sailor]

My M&P340 has that same bevel. It's definitely machined that way on purpose (at least on mine it is).

 

[Kernel Crittenden]

My M317-3, which is, of course, an alloy J-frame, and about 8 months old, has that bevel. It's symmetric and neatly done, and anodized along with the rest of the frame. Definitely part of the CAD/CAM program that machined the frame, so you know it's there on purpose. Never noticed it until today.

 

[BlackTalonJHP]

I've examined the picture closely and I believe what we are looking at is a small piece of black vinyl electrical tape stuck to the frame. This might prevent the cylinder from closing completely.

 

[bigggbbruce]

duplicate..

 

[bigggbbruce]

I've examined the picture closely and I believe what we are looking at is a small piece of black vinyl electrical tape stuck to the frame. This might prevent the cylinder from closing completely.

Good eyes.. But no..

Tape is to cover Ser# so we can't steal the gun..

 

[pittpa]

My M&P340 has that same bevel. It's definitely machined that way on purpose (at least on mine it is).

My 340 PD does not have the OP's feature. It is square all the way up and down that part of the frame.

 

[Truckin]

My 438 and 638-2 have the same bevel.

Weight reduction?????

 

[indie_rocker]

My recent production 642-1 has the same bevel. I never noticed it until this post and honestly thought mine was squared off. I've owned it for almost a year!

Also, I don't think it weakens the frame in any way. It's a pretty small bevel.

 

[torizus]

Checked a couple 642's, same bevel cut. This is a real stumper so I'm going with the old standby explanation for past bevel cuts in weird places.

It's a black powder bevel/chamfer !

That's my story and I'm stickin to it.

 

[Kernel Crittenden]

My 340 PD does not have the OP's feature. It is square all the way up and down that part of the frame.

What's the vintage?

 

[Coastie762]

This thread got me curious so I checked my accumulation of alloy-framed J's. I found one, a 637-2 purchased new in 2007 that did NOT have a beveled frame as depicted by the OP. This gun (serial prefix DAJ) appears to be late 2006 production, special order code 6284.

Of the other four alloy J's, all are of more recent production (one in 2012, two in 2015 and one in 2017). All of these have the frame bevel. I don't know why it's there, but they all shoot like they are supposed to.

 

[Pondoro]

What's the vintage?

That is the right question. If production changed at some point, from non numerically controlled machining to numerically controlled, then someone wrote a set of commands that moved tools. Tool paths are critical to the tool not hitting stuff that it shouldn't hit, and to speed production. Some machined "features" are produced by the programmer choosing a specific tool path and are not requested by Engineering. I'm not saying this did happen, just floating a possibility.

Another possibility- the company has a lot of problems with small cracks in their forgings. The cracks show up in the same area. They scrap the bad forgings but worry about tiny unseen cracks slipping through. So they just start machining that area off all the time. Again I'm not saying this happened, it is just a thought.

So if this shows up after a certain date the ideas I raised are possible explanations. In either case Engineering should have been asked, "Is this ok?" Generally they are asked. Not always.

 

[ABPOS]

My 442-1 no lock 2013 production has it.

 

[Sevastopol]

Maybe S&W is farming out some of it's production to Ruger.

 

[BlackTalonJHP]

Maybe S&W is farming out some of it's production to Ruger.

Well the OP made no mention of it rattling when he handled the gun so I'm thinking Ruger had no role to play here.

 

[RGVshooter]

Ok so I took a closer look at my 642-2 model and yes, mine also has that bevel that you guys are talking about... I can't seem to figure out for what reason it's there other than perhaps prevent/reduce fouling.

 

[Stevens]

Neither of my J frames has that bevel. They are a 642-2 purchased late 2005,
and a 63-5 purchased mid 2018. Both purchased new
I think Pondoro, in post 32 may be right. Could be to facilitate machining processes.
Steve W

 

[4306]

Just picked up an M&P 340 and it has the bevel.

 

[mscampbell2734]

My circa 2002 442-2 does not have the bevel. It DOES show wear in that area that if it was beveled would not be there.

SO I'm thinking it was a design change to prevent the wear. When it happened I have no idea.

 

[JDinAZ]

4306

What that comes from is the fancy yoke screw on the current production models has a plastic spring loaded tip. Let's the tip of the yoke screw drift a bit fore and aft with the crane movement.

And or a little vertical play between the yoke stud O.D. that slides into the frame and the I.D. of the hole it slides into.

A couple thou is all it takes to make it rub.

Both will make the crane to rub against the frame and create the spot you are showing.

My 329PD has a bit of the same thing going on. The 438 doesn't have it yet.

When I get time I'm going to order an old school solid yoke screw and fit it in the 329. If the solid yoke screw doesn't work in the new production frames I'll wind up firing up the machines and making a new yoke screw for mine.