First the rambling... When I build a 1911 from parts I feel like I've really done something and almost break my arm patting myself on the back. Then I realize what JMB did and how many parts on the gun do more than 1 thing and how well it"s worked for so many years and it's humbling.
Now, when you cut the lower lugs on the barrel you usally stop when the thumb safety will go into the notch on the slide or there about. I'm wondering what advantage/disadvantage there is from cutting more and moving the barrel/slide further toward the front? Wouldn't this be the same as moving the VIS back? Or is the optimum when the link has the proper angle? How much will timing be affected? I need another sleepless night to think about all this.
It would not be the same as moving the VIS back. The distance between the VIS and slide stop pin would be the same regardless of what you do to the barrel lugs.
Quote:
...when you cut the lower lugs on the barrel you usally stop when the thumb
safety will go into the notch on the slide or there about. I'm wondering what
advantage/disadvantage there is from cutting more and moving the barrel/slide
further toward the front?
On the assumptions that the thumb safety notch/breechface distance and the slide stop pin hole/thumb safety pin hole distance are within specs, use the thumb safety notch as your guide for when to quit cutting.
Some slides have extra material on the back to allow blending to the frame, and if you use the back of such a slide as your guide to quit cutting you may cut too much off the barrel's lower lugs. FWIW, those on a mid-spec GI barrel measure 0.112" from front to back.
Thats right RobL, but the barrel could be in battery farther forward or back in relation to the slide stop pin and VIS because it is pivoting on the link.
I don't think you understood my question. I'm not asking how to do it I want to know what would happen if you took off .005, .010 or more off the lug in effect moving the barrel/slide .005, .010 farther forward. If someone came into your shop with a 1911 that had the feed ramp adjusted by a Dremel until the nose of the cartridge was sticking on the bottom edge of the barrel would this help any?
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If someone came into your shop with a 1911 that had the feed ramp adjusted
by a Dremmel untill the nose of the cartridge was sticking on the bottom edge
of the barrel would this help any?
Why didn't you give this information in your original post? Not too many of us are clairvoyant.
Anyhow, whacking more off the lugs so the barrel & slide sit farther forward in battery has absolutely zero affect on how far aft the barrel sits on the bed when linked down.
What is VIS? Excuse the newb question please.
Vertical Impact Surface: the part of the frame the back of the lower lugs hit during linkdown. Sometimes with a "bowtie" cut. Niemi will be along shortly with a nice drawing and/or photo, no doubt.
Howzabout a pic instead? PICTURE 404