1900 AE Heavy Wear Marks?

skeeter4206 · 12-28-2012, 10:46 AM

Well postino I got to agree with you. I took my other luger this morning with a coil type mainspring and I also got right around 10.5 almost 11. But it takes a more of an initial pull to get the toggle to start moving. Once It passes a certain point and start pulling slowly to the point where the hold open catch catches, it reades almost the same as my 1900. Weird cause I sure though it would be a much higher reading. I think its just that initial point of getting the spring to start compressing that just feels totally different that the leaf spring that doesnt have that kind of action.

sheepherder · 12-29-2012, 09:43 AM

Quote:

Originally Posted by skeeter4206

Weird cause I sure though it would be a much higher reading...

The coil spring Luger has a "L" shaped 'recoil lever' between the coupling link and the mainspring which the flat spring Luger does not have. I think this changes the feel of the pull...It may even provide a mechanical advantage by providing leverage that the flat spring does not enjoy...

It's been 37 years since I took all this stuff in college, and trying to plot vector diagrams to determine mechanical advantage is beyond me...

IIRC, springs are rated by the amount of weight required to compress a spring one inch...So a 36 pound mainspring should take 36 pounds to compress it one inch...

I was mildly interested in seeing how much pressure it would take to deflect the flat spring one inch...(Pic attached)...

It took 6 pounds...Unfortunately, this has no relation to anything in the real world as pertains to this discussion, as the Luger grip frame has several points that touch the mainspring and affect the mechanical advantage...

But it does give me a base to compare other mainsprings against...Without installing them...

I have been told that some gunsmiths have made replacement flat springs by milling a single piece of spring steel to the required size & shape...It would be interesting to compare those with the OEM two piece Luger mainspring readings as detailed in this thread...

12-28-2012, 10:46 AM	#1
skeeter4206 User Join Date: Aug 2012 Location: Augusta, GA Posts: 448 Thanks: 52 Thanked 88 Times in 49 Posts	Well postino I got to agree with you. I took my other luger this morning with a coil type mainspring and I also got right around 10.5 almost 11. But it takes a more of an initial pull to get the toggle to start moving. Once It passes a certain point and start pulling slowly to the point where the hold open catch catches, it reades almost the same as my 1900. Weird cause I sure though it would be a much higher reading. I think its just that initial point of getting the spring to start compressing that just feels totally different that the leaf spring that doesnt have that kind of action.