Author Topic: F.A.M.E. Mod for Mrods  (Read 7830 times)

Dairyboy

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F.A.M.E. Mod for Mrods
« on: August 24, 2016, 08:25:19 AM »
I just hafta commend the guy 22synrodn/triggertreat for coming up with this mod! Did it to both my .22 and .30 which were both having problems with cocking and the .30 was so bad it was jammed. All I did was this mod didn't change anything else and now they both cock as smooth as butter! If you have the means to do so I highly recommend it. I haven't checked my tunes yet but is supposed to really tighten ES and SD as well.

This post is from the man himself explaining it

"In my view, the biggest problem with the mechanics of the Marauder and other similar guns is hammer drag.  I’ve been trying to find a better way to limit this drag in my DIY SSG and have found a simple, DIY way to do this and have decided to share my idea with others.

I introduce to you the F.A.M.E mod which stands for Friction Assist Marauder Enhancement.

My idea lifts the rear of the hammer up and off the air tube which drastically reduces the friction/drag between the two and eliminates galling.  I find my strings are more uniform and the cocking effort much easier and smoother.  Also dirt and dust does not affect the hammer nearly as much or as often.  My ES and SD numbers have dropped a considerable amount as well.

You can hone the air tube and polish the hammer but still can’t eliminate as much drag as this mod can.  The washer sliding on the top of the air tube has far less friction than the hammer to air tube friction.  The 1/4" tubing keeps the hammer centered and off the sides of the metal slot further reducing drag.

Another benefit is that the power hungry shooters among us can have increased spring ratings and still have reasonable or at least doable cocking effort.

Here is a comparison of two very similar tunes with and without the mod and shows how much more uniform the mod makes the string:



Here is a top view of the F.A.M.E mod installed in my Internal DIY SSG setup.  I’ve been using this mod on and off for quite some time now and the differences are very evident to me.  So much so that I don’t want to tune without it.  The nylon spacer on the end of the bolt is not part of the F.A.M.E mod but is another mod I added to the DIY SSG to reduce rebound noise from the bolt hitting the gap adjuster.



Here are more details and the parts needed to do the mod:



Here is the mod to the breech needed to clear space for the washer to slide.    You only need to remove just enough of the slot to allow for the thickness and width of the washer used.  You can substitute the steel washer for a brass or bronze one that may slide better and last longer.



If you’re just curious is to how much drag reduction this will give you, you can do a quick test by installing the 1/4” tubing and washer to the hammer lug, tuning it correctly and running your hammer back and forth to feel the difference it makes before trimming the breech.  I think you will be pleasantly surprised at the difference as I was when testing it for the first time."
« Last Edit: August 24, 2016, 10:36:29 AM by Dairyboy »


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Bob La Londe

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Re: F.A.M.E. Mod for Mrods
« Reply #1 on: August 24, 2016, 10:31:25 AM »
What is the F.A.M.E. mod? 
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ncrary

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Re: F.A.M.E. Mod for Mrods
« Reply #2 on: August 24, 2016, 03:29:59 PM »
Bob,

F.A.M.E mod which stands for Friction Assist Marauder Enhancement.

It is pretty well documented in the photos in the OP.
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Dairyboy

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Re: F.A.M.E. Mod for Mrods
« Reply #3 on: August 24, 2016, 03:43:19 PM »
I did edit my post to include the whole low down on the mod.
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Re: F.A.M.E. Mod for Mrods
« Reply #4 on: August 24, 2016, 08:34:14 PM »
Thank you.  Makes perfect sense

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3BI5

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Re: F.A.M.E. Mod for Mrods
« Reply #5 on: August 24, 2016, 11:46:02 PM »
I'm using this mod with first gen NBH. It got rid of all the cocking issues, but in my case it didn't help to tighten the ES and SD.

Dairyboy

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Re: F.A.M.E. Mod for Mrods
« Reply #6 on: August 25, 2016, 05:54:39 AM »
I'm using the last style of NBH and it too helped with any cocking problems but I haven't checked ES or SD yet to see if that changed but cocking smoothness alone was well worth it
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Re: F.A.M.E. Mod for Mrods
« Reply #7 on: August 25, 2016, 08:42:46 AM »
I wonder if acetal buttons pressed into the hammer so it rides on them instead of against the tube might have the same affect? 
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wilsonj1018

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Re: F.A.M.E. Mod for Mrods
« Reply #8 on: August 25, 2016, 11:22:52 AM »
probably would work to the same effect bob.
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3BI5

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Re: F.A.M.E. Mod for Mrods
« Reply #9 on: August 26, 2016, 12:07:29 AM »
I've been thinking about trying teflon buttons on the NBH hammer. Maybe start with buttons on the underside or trigger side only. My NBH is very early version gen1 and it's very loose on the airtube. I have a regulated set up with good effiency but the ES and SD numbers are too random. I have one string in my testing logs where I got something like 0.8% ES over 24 or 32 shots. This was before going regulated. I was trying ceramic based "dry" lube. Well it wasn't a real dry lube suitable for airguns. It had ceramic particles in carrier oil. It worked for one string and not minute longer. But that one string was one smooth one. But anyway it gave clear indication that the hammer sticking in the airtube was atleast one major reason for the random ES and SD numbers.   

Bob La Londe

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Re: F.A.M.E. Mod for Mrods
« Reply #10 on: August 26, 2016, 08:19:00 AM »
Graphite spray lubes have a carrier that fully evaporates from what I can tell.  I use Drop-Out all the time for lead casting, but any of the aerosol graphite lock lubes should work. 

Another might be Super Lube Silicone lube.  I've never used it, but when my dad owned a contract post office its what they used in all the post office box locks that got gritty and started having problems.  He swore it didn't hold dirt like other lubes. 

Teflon buttons sound like another good option.  I think I would go for a three point design with a three pockets on the hammer for the buttons to rest in, and the net diameter of the three points being just a smidgeon smaller than the tube.  This way the hammer would stay stabilized in the center of the tube.  The fit into the hammer would not even even need to be super tight. 




 
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3BI5

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Re: F.A.M.E. Mod for Mrods
« Reply #11 on: August 26, 2016, 10:41:55 AM »
I've been using graphite spray, it works, but it doesn't last very long. It needs a new spray after a couple of fills. 

Three point design may not be possible considering the shape of the hammer and sear slot in the airtube. I was thinking about twin buttons riding close to the sear slot. Something like .187 holes drilled in the hammer and just push in a piece of teflon rod. Actually the F.A.M.E mod should work as the third point keeping the things aligned.

Bob La Londe

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Re: F.A.M.E. Mod for Mrods
« Reply #12 on: August 26, 2016, 10:53:57 AM »
You are right, but also the three points do not need to be classically aligned.  Alternatively you could do 4 points, but then I think you are just adding drag back into the equation. 
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int3man

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Re: F.A.M.E. Mod for Mrods
« Reply #13 on: August 26, 2016, 09:04:05 PM »
You are right, but also the three points do not need to be classically aligned.  Alternatively you could do 4 points, but then I think you are just adding drag back into the equation.
We used to use Button on Piston skirts back in the day!  All the Hemi's had them.  Those were the days.

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3BI5

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Re: F.A.M.E. Mod for Mrods
« Reply #14 on: August 28, 2016, 12:51:49 AM »
Piston skirt coatings on the hammer could also be one thing to try. They should last quite long in this kind of application and also would increase the diameter of the hammer for a better match to the airtube.