|
Forum Rules | Firearms Safety | Firearms Photos | Links | Library | Lost Password | Email Changes |
Register | FAQ | Calendar | Today's Posts | Search |
|
Thread Tools | Search this Thread |
February 28, 2013, 08:23 PM | #1 |
Senior Member
Join Date: April 4, 2012
Location: South Jersey
Posts: 2,217
|
What is timing in a 1911
I have heard the term a few times over the last couple of days. How do you time it and what is being acomplished?
__________________
Concentrated power is not rendered harmless by the good intentions of those who create it. Milton Freidman "If you find yourself in a fair fight,,, Your tactics suck"- Unknown |
February 28, 2013, 08:34 PM | #2 |
Senior Member
Join Date: July 1, 2001
Posts: 6,331
|
Timing is the movement of the action relative to the movement of the bullet or cartridge.
Semis rely heavily on the mag getting the cartridge against the feed lips before the slide hits the case base. Also, the slide has to push the cartridge in a controlled feed. Smacking it from mag to chamber will case a percentage of misfeeds and extractor tension issues. Angles and surfaces must be smooth enough to allow this to happen without burning off all slide energy before lock, but slow enough to maintain the controlled feed sequence. This balance must be within acceptable levels for all rounds in the mag. |
February 28, 2013, 10:05 PM | #3 |
Member In Memoriam
Join Date: March 17, 1999
Posts: 24,383
|
Timing can also apply to the unlocking part of the cycle. The link has to pull the barrel locking lugs out of engagement with the slide lugs at the right moment.
Jim |
February 28, 2013, 10:09 PM | #4 |
Senior Member
Join Date: February 25, 2013
Posts: 249
|
+1 Nathan
One of the big reasons they have some problems with a few 1911 longslides, most timing lies in the recoil spring and slide wieght , they even have different springs for plus p rounds, you can do every upgrade to a 1911 in the book to make it reliable , but a cheap or mismatched spring makes the gun a paper wieght |
March 1, 2013, 04:47 AM | #5 | |
Senior Member
Join Date: May 17, 2004
Location: NC Piedmont/Foothills
Posts: 666
|
Quote:
Timing is mechanically fixed, and the timed function will occur at its appointed place in the cycle, regardless of the speed of the cycle. Time is a function of speed and distance. If you disable the automatic spark advance in a distributor and set the ignition timing to fire the plug at 10 degrees BTDC, the plug will fire at 10' BTDC whether the engine is idling or at redline.
__________________
If your front porch collapses and kills more than three dogs...You just might be a redneck |
|
March 1, 2013, 04:58 AM | #6 |
Senior Member
Join Date: November 13, 2006
Posts: 8,286
|
One of the long established top quality barrel makers for 1911's is Scheumann Barrels.It is noteworthy that Kuhnhausen refers to them.
This link will take you to Schuemann's explanation of 1911 timing. http://schuemann.com/Portals/0/Docum...1%20Timing.pdf It has to do with the barrel being drwn down out of lockup by the link.This occurs till the underlug of the barrel contacts the frame,then the barrel stops moving to the rear,and it stops moving down.The slide continues to the rear. It is critical at this point that the locking lugs are fully disengaged. They must fully disengage during the dynamics of firing. Almost,but not quite fully unlocking is harmfull to the lugs ,both barrel and slide. The link gives a more complete explanation,and a description of checking it. Last edited by HiBC; March 1, 2013 at 05:18 AM. |
|
|