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Carbine Club Datasheet Question |
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m1a1fan
Hard Corps Got Para? Joined: Jan 01 2016 Location: Virginia Status: Offline Points: 1736 |
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Posted: Apr 24 2017 at 6:01pm |
I have the newly updated CCDS and I'm hoping the experts can help me fill it out. On page two I'm not sure where to look to answer the following questions:
Receiver firing pin cut Extra cut on the bottom of the receiver Thanks! |
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sling00
Hard Corps Joined: Apr 21 2016 Location: Tennessee Status: Offline Points: 941 |
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Looks like this may be the "Firing pin mating cut" and "retracting cam" shown in NL 341-3? It also discusses "no cut" and "cut" on that same page. Perhaps the "extra cut" referred to on the CCDS? Personally I didn't even attempt page 2. Is the CCDS you have the 01-01-11 revision or is there a newer one somewhere? Thanks
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RedSpecial
On Point Joined: Apr 03 2016 Location: PBC, FL Status: Offline Points: 124 |
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I didn't know there was a page two...
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-Neil
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m1a1fan
Hard Corps Got Para? Joined: Jan 01 2016 Location: Virginia Status: Offline Points: 1736 |
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@sling - Thanks, I'll check those out. This is my first attempt at page 2. The datasheet was updated recently to include an additional page courtesy of newscotlander. It is optional but provides additional information for collectors. I normally use the back of the datasheet to fill in things like which parts are blued, parked, etc... and the additional page makes it much easier and is well formatted.
@Red - Check the link and you will see there are now two pages for the DS http://uscarbinecal30.com/forum/uploads/4/CC_-_DataSheet_rev4__1-1-11.pdf |
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Lupus Dei
Hard Corps Club Secretary Emeritus Joined: Nov 09 2015 Location: CCC Status: Offline Points: 1417 |
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Page two was a recent addition that was made by Chris Albright for his own use. We thought it useful due to adding things such as blued/park/white for certain parts.
the firing pin cut can be sort of seen here Sounds like a good task for someone to make a tutorial for page two!
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Louis Dey
Admin www.uscarbinecal30.com/forums |
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m1a1fan
Hard Corps Got Para? Joined: Jan 01 2016 Location: Virginia Status: Offline Points: 1736 |
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Thanks Lupus.. I'll volunteer to make a tutorial once I'm finished writing some potential articles for the club.
So little to do, so much time.....Strike that, reverse it...carry on. |
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NewScotlander
Grunt Advanced Collector Joined: Jan 02 2016 Location: New York Status: Offline Points: 682 |
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Sorry for the confusion on this. As previously stated, I made page two for my own use and abbreviated some things. The "receiver firing pin cut" is technically referred to as the "firing pin retracting cam mating cut" in TM 9-1276. Below is the article in NL341.
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m1a1fan
Hard Corps Got Para? Joined: Jan 01 2016 Location: Virginia Status: Offline Points: 1736 |
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Thanks newscotlander.
No confusions, just more data for collector's to note, document and learn about. Thinking I might update the form again to include some type of "scratch pad" for miscellaneous information. The amount of information about carbines can be overwhelming at times, but that is a good thing. |
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W5USMC
Moderator Group Joined: Apr 29 2017 Location: Missouri Status: Offline Points: 2949 |
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So I have now completed three data sheets, on my Rockola my S'G' and my Inland, I even almost completed page 2. Which led me to this post about the firing pin cut and the extra cut on the bottom of the receiver. Only issue I am having is telling the difference between 33 degree and 45 degree on the firing pin mating cuts, not really sure how to measure.
First picture is my Rockola which I believe to be a 33 degree cut? The second pic is my S'G' which I think is a 45 degree cut? The 3rd pic is my Inland which I think is a 33 degree cut? Am I correct in what I am thinking or are they all the same cuts?? All three have the extra cut on the bottom of the receiver.
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Wayne
USMC Retired NRA Life Member |
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W5USMC
Moderator Group Joined: Apr 29 2017 Location: Missouri Status: Offline Points: 2949 |
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And here is a pic of my winchester, no extra cut on the bottom of the receiver. I am still having trouble deciding between 33 and 45 degrees for the firing pin mating cut.
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Wayne
USMC Retired NRA Life Member |
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m1a1fan
Hard Corps Got Para? Joined: Jan 01 2016 Location: Virginia Status: Offline Points: 1736 |
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Hard to tell for sure, but think you cut assessment is correct.
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sling00
Hard Corps Joined: Apr 21 2016 Location: Tennessee Status: Offline Points: 941 |
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I "guess-timate" by the symmetry of the cam cut-out. If they look pretty even on both side then 45. If noticeably longer on one side then its a 33. I'll look for a small clear plastic protractor and see if that helps.
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sling00
Hard Corps Joined: Apr 21 2016 Location: Tennessee Status: Offline Points: 941 |
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I haven't found any definitive reference to what the cam angle is referenced so my guess is perpendicular to the bolt. Drawing a line that best fit the curve of the cutout on the eject side of the receiver, with a cheap plastic protractor I measured amazingly close to the listed 45 and 33 degrees.
???
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W5USMC
Moderator Group Joined: Apr 29 2017 Location: Missouri Status: Offline Points: 2949 |
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Thanks sling00, that was a great help. I have a protractor but I was not sure where I was supposed to be holding it to get the measurement.
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Wayne
USMC Retired NRA Life Member |
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sling00
Hard Corps Joined: Apr 21 2016 Location: Tennessee Status: Offline Points: 941 |
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Like I said that is my best "guess-timate" for point of reference and I welcome any better answer. Using my protractor looks like all yours, including the S'G' are 33s? Note your pic of the S'G' is at a slight angle which slightly skews the actual angle. However keep in mind that's me trying to hold a straight edge and protractor on a swiveling monitor.
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jackp1028
Hard Corps Joined: Jan 01 2016 Location: Cloudcroft, NM Status: Offline Points: 1273 |
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Does anyone have access to the original engineering drawings for the receiver? What does that show? I've only seen detail dimension drawings for the Type 6 TH, Type 5 slide and Type 4 stock.
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JackP
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New2brass
Moderator Group Dan Pinto, Photo Editor Joined: Nov 29 2015 Location: CT Status: Offline Points: 4627 |
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Just a thought, as I have not checked. It the 33 and 45 in relation to the bolt position? Meaning the degree of rotation before the firing pin is allowed to start to move forward.
Looking at an early Underwood the cam cut is long. A 5 mill Inland it is an abrupt cutout. If you hold the FP in and slide bolt you will see how it prevents firing pin from slam firing until it is locked in place. earlier receiver may allow slam fire.
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m1a1fan
Hard Corps Got Para? Joined: Jan 01 2016 Location: Virginia Status: Offline Points: 1736 |
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That's the part I don't get. I see the arrows, but I'm not sure where to measure the angle.
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floydthecat
Hard Corps Joined: Oct 13 2016 Location: Mississippi Status: Offline Points: 1996 |
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New2brass is suggesting it's not the angle of the cut in the bridge, it's "degrees of rotation" of the bolt. To me...it means they altered the point at which the FP becomes blocked by the bridge. The point at which this occurs depends on the slope and shape of that notch. |
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m1a1fan
Hard Corps Got Para? Joined: Jan 01 2016 Location: Virginia Status: Offline Points: 1736 |
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Ok, thanks. Didn't see sling00 got out the protractor and edited the picture. Makes sense now.
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