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  #1  
Old 10-12-2017, 12:38 PM
andmancrex andmancrex is offline
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Default Para Ordnance LDA Hammer and Sear Location. HELP!

Im sure im not the first to ask you this question. (Please see attachments)

I was wondering if you can help me out with to Sear Hole Location from the center of the Slide Stop Pivot Hole (YELLOW in attachment)
To the LDA Sear Hole (PINK in attachment)?

What is (DOWN)?
What is (ACROSS)?

I got a 80% frame (LDA Single Stack Officer 3.5 length barrel) from Sarco Inc. and i cant find that dimension anywhere.
Not knowing much about the Lda at that time of purchase.
I already have all the parts to complete this build but that hole location.

I know i can convert to single action but i dont want to do that yet since i already have all the double action parts.


If you "cant" help, can you please point me in the right direction?

I am building a Universal Drill/Slide cut fixture with drill bushings for single and double action (LDA) so these numbers wont be a mistery anymore and i will share to whomever needs them.
I know there's fixtures on the market already but not for the LDA Sear Hole Location.
If I am missing any details please let me know.

Please no smart remarks.
We are adults here.
I know im a noob, and you were once one too.


Thank you very much.

Andy O.
Attached Images
File Type: jpg 20170531_114549.jpg (51.0 KB, 50 views)
File Type: jpg 20170531_114715.jpg (47.5 KB, 33 views)
File Type: jpg 20170531_114756.jpg (46.1 KB, 32 views)
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  #2  
Old 10-12-2017, 3:04 PM
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t0rin0 t0rin0 is offline
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It looks like you already have the holes drilled. How did you do that if you don't know where they are supposed to be? With a jig? And are they different than a regular single action 1911? If so, hopefully someone else will chime in. If not heres your direction:

Step 1) look at the pinned post in this forum about blue prints

http://www.calguns.net/calgunforum/s...d.php?t=863039

Step 2) click on the PRINTS link

http://www.klstottlemyer.com/prints-drawings-etc.html

Step 3) scroll to the bottom for the 1911 manuals, click on Volume 2 and go to page 70

http://www.klstottlemyer.com/ewExter...Kuhnhausen.pdf

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  #3  
Old 10-15-2017, 9:26 PM
rrwallace rrwallace is offline
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Quote:
Originally Posted by t0rin0 View Post
It looks like you already have the holes drilled. How did you do that if you don't know where they are supposed to be? With a jig? And are they different than a regular single action 1911? If so, hopefully someone else will chime in. If not heres your direction:

Step 1) look at the pinned post in this forum about blue prints

http://www.calguns.net/calgunforum/s...d.php?t=863039

Step 2) click on the PRINTS link

http://www.klstottlemyer.com/prints-drawings-etc.html

Step 3) scroll to the bottom for the 1911 manuals, click on Volume 2 and go to page 70

http://www.klstottlemyer.com/ewExter...Kuhnhausen.pdf

t0rin0,

andmancrex is looking for information on the light double action version of Para Ordnance's 1911.

Your best bet is to have someone with an LDA measure it for your. Have you tried the forums.1911forum.com for PO LDA owners?

Check at the bottom of this link https://www.m1911.org/technic27.htm This has very good tear down info and the provider of this info listed his email address. You might ask him to measure this for you.

or, this guy is selling his. he might help you...

http://www.calguns.net/calgunforum/s...highlight=para

Last edited by rrwallace; 10-15-2017 at 9:45 PM..
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  #4  
Old 10-21-2017, 10:46 AM
andmancrex andmancrex is offline
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@rrwallace,you are correct.

I got a legit print from an LDA and made my own drawing on SolidWorks and saved it as a PDF based off of the three holes, slide stop, Hammer hole, and sear hole. Here's the drawing link, since I can't upload from my phone.

https://forum.m1911.org/showthread.p...p-Hammer-Print
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  #5  
Old 10-23-2017, 7:07 PM
Burton32 Burton32 is offline
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thanks I've also been looking for this info to be able to finish one of these up.
what size drill bits are used for the hammer/ sear pin holes?
and do you have a location for the msh hole?
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  #6  
Old 10-24-2017, 6:49 AM
tr6guns tr6guns is offline
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The hole dimensions are on the print.
As I don't have the double action parts in my hand I would have to take your word for the Hole sizes but the sear looks like it is the same as in a 1911.
The Slide stop is the same as a 1911.
the Hammer has a 0.019" difference
the Grip safety has a 0.007" difference
So if you drill undersize you can always ream to the right size.
( If locations are Exact ) And thank you for your work on this question that has been asked too many times without being answered..
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  #7  
Old 10-24-2017, 9:43 AM
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ar15barrels ar15barrels is online now
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Quote:
Originally Posted by andmancrex View Post
@rrwallace,you are correct.

I got a legit print from an LDA and made my own drawing on SolidWorks and saved it as a PDF based off of the three holes, slide stop, Hammer hole, and sear hole. Here's the drawing link, since I can't upload from my phone.

https://forum.m1911.org/showthread.p...p-Hammer-Print
When you get to a real computer, can you post the picture or the PDF file here as well.
I do not seem to have a login on that other site.
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  #8  
Old 10-25-2017, 7:14 AM
tr6guns tr6guns is offline
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Here is the Pic..
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File Type: jpg Draw1%20Hammer%20Sear%20Location.jpg (23.6 KB, 63 views)
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  #9  
Old 10-25-2017, 9:20 AM
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Quote:
Originally Posted by tr6guns View Post
Here is the Pic..
Thanks.

To the OP: are the dimensions on your drawing rounded to 2 decimal places, or are they truly only 2 decimal place dimensions?
0.010" is a lot of tolerance on a hole diameter/location.



It's normal to call out dimensions to 3 decimal places.

A comparison to a standard 1911:
Feature, X, Y, Diameter, LDA X, LDA Y, Diameter
Slide Stop(origin) 0, 0, 0.201, 0, 0, 0.20?
Safety, +3.368, -0.210, 3.38?, -0.20?
Hammer +2.973, +0.016, +2.98?, +0.02?
Sear +2.602, -0.252, +2.75?, -0.68?
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Last edited by ar15barrels; 10-25-2017 at 9:37 AM..
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  #10  
Old 10-26-2017, 6:47 AM
tr6guns tr6guns is offline
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If memory serves me, ( which is questionable at 76 ) All the location dimensions are the same as a 1911 Except the sear, from what I have heard.. So depending on how the measurements were made, and what was used to measure, everything is close Except the Sear...
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  #11  
Old 10-26-2017, 9:01 AM
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Quote:
Originally Posted by tr6guns View Post
So depending on how the measurements were made, and what was used to measure, everything is close Except the Sear...
That was my guess from looking at how similar the dimensions are.
It looks to be just manufacturing tolerances and measuring error that throws his drawing off.
But that then makes me question the accuracy of the LDA sear hole.
I suppose 0.010" won't matter as you can always fit the part to the frame to make it work, but it's always nice to be as precise as you can...
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  #12  
Old 10-26-2017, 11:53 AM
andmancrex andmancrex is offline
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All the holes are in the same location as a 1911 except the Sear location and the hammer hole diameter is smaller on the Lda.

Here is another drawing i made.

FYI!
My dimensions are for the LDA Officer Frame!

Sure you can be within 0.010".
Its not rocket science guys. Lay it out, center punch, center drill, then drill. don't let the drill walk.
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File Type: jpg Draw1 Para Image.jpg (82.4 KB, 11 views)
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  #13  
Old 10-26-2017, 11:57 AM
andmancrex andmancrex is offline
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Quote:
Originally Posted by Burton32 View Post
thanks I've also been looking for this info to be able to finish one of these up.
what size drill bits are used for the hammer/ sear pin holes?
and do you have a location for the msh hole?

Lower left .160 dia hole
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File Type: jpg Draw1 Para Image.jpg (82.4 KB, 9 views)
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  #14  
Old 10-26-2017, 12:16 PM
andmancrex andmancrex is offline
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Here's a labeled drawing.
Sorry for the mess.
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  #15  
Old 10-26-2017, 4:10 PM
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Quote:
Originally Posted by andmancrex View Post
Here's a labeled drawing.
Sorry for the mess.
Please increase the dimensions to 3 decimal points.
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  #16  
Old 11-20-2017, 10:49 AM
wafflehammer wafflehammer is offline
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Default andmancrex is still both a gentleman and a scolar

would you like me to put these into autoCAD for you use? My job though not specifically drafting foces one to cut their teeth on CAD and I would have no problem, especially given a decent officers/c6.xx CAD outline for reference.


Otherwise it's off to CAD I go, if you want I'll PM you the CAD and or DXF/DWF/PDF and won't step on your jiggy toes!
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