Getting more interesting every day.....this V-3

[Bill Calfee]

Getting more interesting every day.....this V-3


CYA friends:


We're in uncharted waters with this new V-3...

Either by clever design or blind luck, we're getting a new perspective on the most consistent rimfire ignition in the world, MD-PAS.

And it's most citing....

Like the mind blowing thing I discovered today.


___________________________




I've been measuring spring rates.


I use a 20 pound scale that I place a fixture on top of, and the whole thing sits on my drill press table so I can use the spindle of the drill press to apply pressure to the spring.


To keep the spring from flexing I mount a common twist drill in a small machinists vise.


The Jacobs chuck, of the drill press, is opened enough so it will easily slide over the drill, and at the same time compress the spring.


I have a simple height gauge mounted beside the drill.


I visually bring the tip of the Jacobs down till I can see the absolute thinnest crack of light between the chuck tip and the top of the gauge.


This is not a perfect system, but, I'll bet I'm within a half pound of a sophisticated spring rate measuring instrument.


Your friend, Bill Calfee

_______________________

This picture is of the set-up....very simple, but pretty accurate.

__________________________________

______________________________________

The first thing I did was to zero out the weight of the vise, drill and spring.

_____________________________________

_________________________________


This first test is with a full length Pepper spring.

It tested at 24 pounds and 2 ounces, which is almost exactly what I got the last time I tested a Pepper, some years ago.

This is @ 1.750" compression length.

By the way, this is a 20 pound scale, so the dial is on its second swing.

_______________________________________

______________________________

CYA frends:

Now this is mind blowing...


The cut down Pepper I'm driving the .033" width firing pin tip on my V-3 with, only has 8 pounds rate at 1.750" compression.


A lot of folks use the Pepper, with over 24 pounds of rate at 1.750", including me, to drive MD-PAS ignitions to what I'm driving this .033" width V-3 pin to, with only 8 pounds rate at 1.750" compressed length.


This is mind blowing......


Actually mind blowing is an understatement.

________________________________

________________________________


I'm starting with just 8 pounds, and doing the same thing, even easier, than I used to do starting at 24 pounds...

Yes, mind blowing is most certainly an understatement.....

 

[Todd Earhart]

This set up is closer than one would think. If I have alot of springs to check I prefer this way over the intercomp. On springs this low its only 2 tenths between the two test. 8 psi is amazingly low.
Todd

 

[Bill Calfee]

The tiny V-2 spring

The tiny V-2 spring


CYA friends:


This tiny V-2 spring has a diameter of .230" as opposed to .240" diameter for the Pepper, Wilkinson, Harper and E-Turbo springs.


So I thought I'd check its rate.


And it blew my mind...


This little V-2 spring rate is 6 ounces greater than the cut down Pepper that I'm driving my .033" width pin with.


_____________________



Some perspective:


I'm doing with 8 pounds of spring rate what I used to do with 24 pounds.........


And please keep something in mind here that is absolutely fascinating:


When the firing pin in this V-3 starts forward, propelled by only 8 pounds of spring rate, that rate doesn't increase as the pin moves forward.


That 8 pounds of rate diminishes as the pin moves forward.


How in the world is this thing doing this?


I'll tell you how.......it's called being totally "free".


____________________


CYA friends, when Jeff Patterson and I ran the free test on this V-3, and then Tom Wilkinson confirmed his V-3 was the exact same way, I've been more impressed with this "freeness" than anything I've seen in the advancement of rimfire accuracy in years.


Your friend, BC

_____________________


This little V-2 spring actually has 6 ounces more rate than the cut down Pepper I'm killing it with in this V-3.

____________________________

______________________

CYA friends, I'm driving this .033" width pin, to exactly the proper depth, with exactly the proper relief off of my mechanical stop, with just 8 pounds of spring rate...

And this is all being done with the "consistency" of MD-PAS ignition as a bonus.

This is mind blowing.
___________________