Author Topic: Measuring mainspring strength  (Read 276 times)

Offline Navy Six

  • Top Active Citizen
  • *
  • Posts: 459
  • SASS #: 26385
  • NCOWS #: 1410
  • Liked:
  • Likes Given: 66
Measuring mainspring strength
« on: March 21, 2024, 11:13:33 AM »
I intend to conduct a series of tests on Colt style percussion pistols in regards to mainspring strength and its affect on percussion cap performance. I would like to accurately measure and compare a variety of mainsprings. I do have a trigger pull gauge and considered measuring that as I swapped out different mainsprings on the same gun. Is there a better way of doing this? I don't want my results to be based on "well, this spring feels heavier than that one". Any thoughts would be appreciated.
Only Blackpowder Is Interesting 
"I'm the richest man in the world. I have a good wife, a good dog and a good sixgun." Charles A "Skeeter" Skelton

Offline Coffinmaker

  • Top Active Citizen
  • *
  • Posts: 7605
  • Liked:
  • Likes Given: 125
Re: Measuring mainspring strength
« Reply #1 on: March 22, 2024, 09:37:06 AM »

 :) Navy Six  ;)

Well Ok, a couple of thoughts.  First thought, Trigger pull only measures trigger pull.  A poorly fit trigger can have a heavier "pull" than a well fit trigger, regardless of Main Spring.

One would have to build a jig to hold ALL subject Main Springs in a like position, then connect them to a gauge that measures the amount of "pull" required to move the action end a measured amount of deflection.  Then one would have to measure the effect of "stacking" (increased pull) over the full deflection of the spring.  Once documented, one would have to insure there was absolutely NO drag in the moving parts of the subject test action.

The results, as applied to the reaction of Percussion Caps, would then be skewed by the differentiation of material used by the manufacturers of differing cap brands.  Also skewed by the differing types/amounts of explosive material and thickness of sealant, also skewed by specific lot numbers of the various manufacturers.

The same variations would also be observed in various Main Springs, by manufacturer, based on lot numbers (unknown) and varying dates of manufacture.

Considering ALL the variables and complications, I think the objective "Gee, That one feels different" is as definitive as it's going to get.  along with measuring the specific Brisbane of the various caps.  Also, the test subjects would all have to be tested on exactly the same set of nipples.  Yule also need to arrange for a High Speed High Frame Rate camera and a skilled operator with a concurrent trigger mechanism.

Have Fun!!

Offline Navy Six

  • Top Active Citizen
  • *
  • Posts: 459
  • SASS #: 26385
  • NCOWS #: 1410
  • Liked:
  • Likes Given: 66
Re: Measuring mainspring strength
« Reply #2 on: March 22, 2024, 04:20:56 PM »
Thanks Coffinmaker. I received a response from Mike Brackett about how he does it(uses trigger pull gauge after hammer is brought to half cock. Hook gauge behind hammer face. When hammer moves record numbers).
My testing is to satisfy me as to why, some of my Colt style percussion guns will still occasionally suck caps despite:
arbor length correction
Slix Shot nipples
polished hammer face and safety notch
polished internals
One or two of my problem guns have responded to a heavier mainspring which cut down the problem significantly. I have no intention of installing a "cap rake". I feel the real problem is the darn caps. The thin construction material of caps combined with hotter caps along with generally lighter factory mainsprings has created this "perfect storm" of cap sucking, at least in my opinion. Having the opportunity to examine several original Colts, both SAA and percussion, I've noted a much heavier mainspring in all of them. Even though I am actively involved in SASS and enjoy a smooth, light action as much as the next person, if I have to go to a somewhat heavier mainspring in my percussion pistols in order to avoid problems, so be it. Besides, all this testing gives me an excuse to shoot more!
Only Blackpowder Is Interesting 
"I'm the richest man in the world. I have a good wife, a good dog and a good sixgun." Charles A "Skeeter" Skelton

Advertising

  • Guest
Re: Measuring mainspring strength
« Reply #3 on: Today at 01:21:47 PM »

Offline 45 Dragoon

  • Top Active Citizen
  • *
  • Posts: 465
  • Liked:
  • Likes Given: 123
Re: Measuring mainspring strength
« Reply #3 on: March 22, 2024, 05:31:24 PM »
 :)
www.goonsgunworks.com
Follow me on Instagram @goonsgunworks

Offline 45 Dragoon

  • Top Active Citizen
  • *
  • Posts: 465
  • Liked:
  • Likes Given: 123
Re: Measuring mainspring strength
« Reply #4 on: March 22, 2024, 05:49:59 PM »
 :)
www.goonsgunworks.com
Follow me on Instagram @goonsgunworks

Offline Professor Marvel

  • purveyor of useless items to the gentry
  • American Plainsmen Society
  • Top Active Citizen
  • *
  • Posts: 3081
  • learn from the past, or be doomed to repeat it
  • Liked:
  • Likes Given: 1118
Re: Measuring mainspring strength
« Reply #5 on: March 22, 2024, 08:28:31 PM »
Well.
Darn.

Here I was about to devote little grey cells to inventing a most ingenious and complicated contraption…
Your Humble Servant
~~~~~Professor Algernon Horatio Ubiquitous Marvel The First~~~~~~
President, CEO, Chairman,  and Chief Bottle Washer of


Professor Marvel's
Traveling Apothecary
and
Fortune Telling Emporium


Acclaimed By The Crowned Heads of Europe
Purveyor of Patent Remedies, Snake Oil, Powder, Percussion Caps, Cleaning Supplies, Dry Goods,
and
Picture Postcards

Offering Unwanted Advice for All Occasions
and
Providing Useless Items to the Gentry
Since 1822
[
Available by Appointment for Lectures on Any Topic


Offline Navy Six

  • Top Active Citizen
  • *
  • Posts: 459
  • SASS #: 26385
  • NCOWS #: 1410
  • Liked:
  • Likes Given: 66
Re: Measuring mainspring strength
« Reply #6 on: March 24, 2024, 10:39:57 AM »
You still can, Professor. I'm sure it will be a "Marvel" of ingenuity.
Only Blackpowder Is Interesting 
"I'm the richest man in the world. I have a good wife, a good dog and a good sixgun." Charles A "Skeeter" Skelton

Offline Navy Six

  • Top Active Citizen
  • *
  • Posts: 459
  • SASS #: 26385
  • NCOWS #: 1410
  • Liked:
  • Likes Given: 66
Re: Measuring mainspring strength
« Reply #7 on: March 25, 2024, 01:31:18 PM »
Well, just to satisfy myself that I wouldn't be wasting my time, this morning I did a brief preliminary test. A pair of Uberti mainsprings that came out of Cattleman(circa 1998 & 2000 and are definitely heavier than current production) were installed in my Uberti 51 Navy squarebacks. These two cap suck at the rate of 2/3 every 30 rounds or so despite everything done to them. After 60 total rounds I didn't have a single issue. No changes from usual other than the mainsprings. So I will hunt down more mainsprings of a similar weight as I intend to continue testing these two guns as well as a pair of 61 Navies and 60 Armies. I want to know about what weight mainspring is required to make these things work.
Only Blackpowder Is Interesting 
"I'm the richest man in the world. I have a good wife, a good dog and a good sixgun." Charles A "Skeeter" Skelton

 

SMF spam blocked by CleanTalk

© 1995 - 2023 CAScity.com