PS90 Owners I Need Your HELP!

Discuss rifles chambered for the 5.7x28mm; P90, PS90, and AR57.
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starfury
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Re: PS90 Owners I Need Your HELP!

Post by starfury » 23 Dec 2011, 14:02

I was finally able to confirm today that the PS90 rate reducer is made of machinable Tungsten HD17 (at 17gm/cc). I took the reducer out of my PS-90 and tested it on a Bruker XRF spectrometer (http://www.bruker-axs.com/handheldx-ray ... metry.html" onclick="window.open(this.href);return false;) at the office and sure enough the spectrum shows 90% Tungsten, ~7%Nickle and ~3% Iron, so it is slightly magnetic (no copper in the alloy). Also, there is no stainless steel clad – no spectrum ratios for the various types of stainless.

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Re: PS90 Owners I Need Your HELP!

Post by ddouglas » 23 Dec 2011, 16:30

What is a "rate reducer"?

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Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 24 Dec 2011, 00:55

starfury wrote:I was finally able to confirm today that the PS90 rate reducer is made of machinable Tungsten HD17 (at 17gm/cc). I took the reducer out of my PS-90 and tested it on a Bruker XRF spectrometer (http://www.bruker-axs.com/handheldx-ray ... metry.html" onclick="window.open(this.href);return false;) at the office and sure enough the spectrum shows 90% Tungsten, ~7%Nickle and ~3% Iron, so it is slightly magnetic (no copper in the alloy). Also, there is no stainless steel clad – no spectrum ratios for the various types of stainless.
Nice I already have the cad file for a heavier reducer. It will be just a matter of getting some of the Tungsten HD17 to my machine shop.
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Re: PS90 Owners I Need Your HELP!

Post by SoCal Gunner » 24 Dec 2011, 05:54

panzermk2 wrote:
SoCal Gunner wrote:Engrave one, sell it to me and I'll buy another raffle ticket!

We are about to send out case gauges to be laser engraved. I will send out about 10 of the weights and have them done.
:?:

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starfury
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Re: PS90 Owners I Need Your HELP!

Post by starfury » 24 Dec 2011, 09:38

When you are looking, there are also machinable grades HD17.5, 18 and 18.5 which are heavier (1.5gm/cc for the HD18.5). - so by going with your new square design and a heavier alloy you can increase the weight by over an ounce.

http://www.mi-techmetals.com/hd-typical.htm" onclick="window.open(this.href);return false;

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Re: PS90 Owners I Need Your HELP!

Post by ddouglas » 24 Dec 2011, 09:45

I ask again: what is a "rate reducer"?

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Re: PS90 Owners I Need Your HELP!

Post by starfury » 24 Dec 2011, 09:50

It’s the cylindrical weight in the slot on the side of the bolt. By making it heavier (increasing the inertial mass of the bolt) it cycles slower. This can help for hotter loads allowing the bolt to stay in battery for slightly longer (letting pressure drop off) and reduce the magazine popping issues some are having.

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Re: PS90 Owners I Need Your HELP!

Post by ddouglas » 24 Dec 2011, 12:05

Ah ha! Thank you for the information.

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Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 24 Dec 2011, 14:18

ddouglas wrote:Ah ha! Thank you for the information.
In the FA P90 it sets the FA firing rate.
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Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 24 Dec 2011, 14:20

starfury wrote:When you are looking, there are also machinable grades HD17.5, 18 and 18.5 which are heavier (1.5gm/cc for the HD18.5). - so by going with your new square design and a heavier alloy you can increase the weight by over an ounce.

http://www.mi-techmetals.com/hd-typical.htm" onclick="window.open(this.href);return false;

It may be awhile though. This is our very slow session, yearly INS payment will be due and all the money I flushed having the prototypes made really put a dent in my R&D budget.
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Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 04 Jan 2012, 18:47

The first round of testing of a repair to the shaved off/mold issue where the receiver retention button sits have been completed.

As noted at the beginning of this thread some PS90's have shaved off polymer here on the foreword section of the opening making it easier for the receiver to pop out during firing and sometimes when the bolt slams foreword alone.
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Re: PS90 Owners I Need Your HELP!

Post by Cyberfly » 05 Jan 2012, 06:07

I'm curious how you repair damaged polymer? I doubt that a two part resin would hold with repeated use, especially such a small area that gets repeatedly abused like this one. Or are you looking at another way to correct the problem other than repairing the polymer?
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Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 05 Jan 2012, 15:32

Trying an epoxy resin. The problem is the polymer used was from the outset designed to be solvent resistant. Most epoxies are un able to get a bight into the polymer.
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Re: PS90 Owners I Need Your HELP!

Post by Cyberfly » 06 Jan 2012, 06:43

That's sort of what I was thinking. Even if you could rough it up to give it more of a surface area to bite onto, it still would have trouble holding simply bacause of the wear and tear that this particular area is subject to.
Good luck with it Jay, and keep us updated. Curious minds want to know...
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Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 06 Jan 2012, 07:19

Might look into a stronger spring for the take down button.
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Re: PS90 Owners I Need Your HELP!

Post by rcpd34 » 04 Jul 2012, 10:31

Subscribed with interest.

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Re: PS90 Owners I Need Your HELP!

Post by PursuitSS » 20 Jul 2013, 07:20

I ran across this on the "other" Forum:

http://fnforum.net/forums/f27/ps90-stock-46394.html

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Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 20 Jul 2013, 12:49

As you can see old news here. FNH supposedly changed their manufacturing process. I was told the reason this happens was related to how the workers remove the stock halves from the form weakening that area. I tried placing a metal clip in the much like our mag lip protectors but there is not enough clearance to allow for metal thick enough with withstand operation. The thickest clips I could fit in there would still shear in less the 20 rounds.


What needs to bee done is that seem should be moved off center and a stainless steel block molded into the stock.
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Re: PS90 Owners I Need Your HELP!

Post by PursuitSS » 20 Jul 2013, 13:10

panzermk2 wrote:As you can see old news here. FNH supposedly changed their manufacturing process. I was told the reason this happens was related to how the workers remove the stock halves from the form weakening that area. I tried placing a metal clip in the much like our mag lip protectors but there is not enough clearance to allow for metal thick enough with withstand operation. The thickest clips I could fit in there would still shear in less the 20 rounds.


What needs to bee done is that seem should be moved off center and a stainless steel block molded into the stock.
My .02, if someone (Elite) :D would offer a stronger takedown spring, I don't see how this damage could occur.

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Re: PS90 Owners I Need Your HELP!

Post by panzermk2 » 20 Jul 2013, 21:54

PursuitSS wrote:
panzermk2 wrote:As you can see old news here. FNH supposedly changed their manufacturing process. I was told the reason this happens was related to how the workers remove the stock halves from the form weakening that area. I tried placing a metal clip in the much like our mag lip protectors but there is not enough clearance to allow for metal thick enough with withstand operation. The thickest clips I could fit in there would still shear in less the 20 rounds.


What needs to bee done is that seem should be moved off center and a stainless steel block molded into the stock.
My .02, if someone (Elite) :D would offer a stronger takedown spring, I don't see how this damage could occur.

Tried it and it still does. Not enough room in there for a spring strong enough to make a difference. I have another fix that can be applied to bad stocks but have not had enough time to throughly test it.
Jay Wolf
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Be'ein Tachbulot Yipol Am Veteshua Berov Yoetz
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