Ruig,
Thank you for the pictures. Is the longer spring in the picture the original recoil spring? Or did you shorten the original spring to accommodate the second spring? Do you have any data for the shorter spring - wire diameter, number of turns, turns/cm?
My understanding is that the second spring acts like a buffer, bringing the slide to a more gradual stop. So the second spring must be stiffer and does not compress until the long spring is fully/almost fully compressed.
How much softer is the recoil?
Regards,
Fred
[1] Every pistol has its own peculiar properties [2] Laying on all mentioned above: lenght of your springs may be different with mine [3] Cut springs by little steps, until you'll like, like works your cartridge "loading/shell's unloading" system [4] I have no possibility to say exactly "recoil reduce degree"... i just can say: "softer" as never before.
Long spring (IZh35's nature spring):
lenght: 80mm (normal state)
turns: 53
Short spring (TOZ35's firing pin's spring):
lenght: 24mm (normal state)
turns: 13
Metal partition (between springs):
WxHxD = 10mm x 8mm x 2mm
hole diameter: a little bigger than pin
Last edited by ruig on Fri Mar 31, 2006 5:08 am, edited 1 time in total.
Ed,
I don't know whether Wolff will do a custom spring, but they do offer various spring assortments. See http://www.gunsprings.com/1ndex.html and look in their general purpose springs listing. I am going to order their light duty and heavy metric packages and see if one will come close to the TOZ firing pin spring. Big problem (for me) will be to find some IZH recoil springs. Maybe some in the Wolff kit will do. Now I just need to find my old mechanical engineering handbook with all the spring formulas. :-)
You don't need the manual, you just need to measure the compressed length and it would be fairly simple to remove it and the rod and measure the force required to compress it to that length.
I bet it's on the order of 5-6 pounds, so a trigger scale may work.
I take it you are talking about the IZH-35. The IZH-35M supposedly already has reduced recoil to suit rapidfire matches, or are they the same in this regard and therefore the 35M also needs a spring job?
I was looking for the Toz 35 firing spring wire diameter..
My intent was not strictly for recoil reduction, but mainly as a possibllity to buffer slide/bolt impact. From what I have treied so far, this method will increase the force of the impact when the slide closes up against the chamber face.
On mine, I would have to cut the original IZH slide spring for the slide to go back enough to pick up a round from the magazine.
diopter wrote:My intent was not strictly for recoil reduction, but mainly as a possibllity to buffer slide/bolt impact.
When I disassembled and cleaned my IZH-35 on Saturday, I wondered:
Has anybody here experimented with a (plastic, nylon, rubber) buffer piece between the front of the frame and the (rather lightweight) slide, to dampen the impact when using faster ammunition (such as e.g. Federal's "American Eagle", which is quite accurate in my gun, but causes doubling)?
Alexander
Last edited by Alexander on Mon Dec 08, 2008 7:29 am, edited 2 times in total.
diopter wrote:My intent was not strictly for recoil reduction, but mainly as a possibllity to buffer slide/bolt impact.
When I disassembled and cleaned my IZH-35 on Saturday, I wondered:
Has anybody here experimented with a (plastic, nylon, rubber) buffer piece between the front of the frame and the (rather lightweight) slide, to dampen the impact when using faster ammunition (such as e.g. Federal's "American Eagle", which is quite accurate in my gun, but causes doubling)?
Alexander
The peening of the bolt face on the breach is what causes headspace to be reduced and results in doubling.
Alexander wrote:
Has anybody here experimented with a (plastic, nylon, rubber) buffer piece between the front of the frame and the (rather lightweight) slide, to dampen the impact when using faster ammunition (such as e.g. Federal's "American Eagle", which is quite accurate in my gun, but causes doubling)?
I've thought about it, but adding a plastic buffer is not straightforward. Simply adding a buffer, reduces the slide travel and this may effect ejection and/or feeding. The recoil spring can be shortened to allow for the thickness of the buffer, but of course this will effect spring force. Finally, there is the selection of an appropriate material for the buffer. Life is too short; I would rather spend my time just shooting a very nice pistol :-)
Fred
Just pull it over barrel block and front sight onto the barrel.
It's been on mine for a couple of years now. Plain plumbing O Ring.
Mine was occasionally doubling before the o ring even after removing metal peening.
No problems since.
But I have switch to a Pardini as mine main tool.