 |  | | | |  | |  |  | Home Made Power Adjuster For The Discovery |  | |  |  | |
 Posted: Thu Dec 10, 2009 9:39 pm |
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| Mark5043 |
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| Joined: 12 Apr 2009 |
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Well I was pretty bored today so I thought I would take a crack at making a power adjuster for my Disco.I used a 8-32 plastic screw cut down to about a half inch,as a spring guide,and a 10-32x1 steel cap head screw to make the adjustments with.It's a-little "caveman",but it didn't cost anything.I just went through my toolbox,and found these goodies.I did buy a pack of springs a few days ago but the O.D is just a-little too big at 5/16th's.I haven't been able to find the correct O.D.,and wire diameter that I'm looking for locally. I'm looking for a heavier spring,and heard that the 22xx springs are a bit beefier?
I assembled the parts using the stock spring,and I do notice a considerable difference.....  I cracked off a few crow mags,with the adjuster turned about 2 turns out from coil bind,and it really hammers the pellet trap now....  No way to measure fps,because I don't have a chrony yet....but the caveman power adjuster works pretty damn good...... 
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| Posted: Thu Dec 10, 2009 10:07 pm |
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| rsterne |
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| Joined: 15 Jan 2008 |
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| Location: Coalmont, BC |
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I have three questions for you....
Where is the end of the adjusting screw when you are at "coil bind"?....
This leads to question 2 - If you are screwing the adjuster out to the point where the end of the adjusting screw is past (or even flush with) the end cap.... what keeps the back end of the spring centered?....
The reason I ask is that on my velocity adjuster, the shoulder on the adjusting screw (3/8"-16NC) that the end of the spring sits against ends up flush or slightly forward of the end of the end cap when I'm at coil bind.... The adjusting screw has an integral guide forward of that shoulder to keep the spring centered....
In addition - Is the head of the plastic screw small enough to fit inside the end plug when you back off the adjuster?.... I ask because it looks significantly bigger than the spring....
You've come up with a simple and elegant solution.... I would just be concerned about the back end of the hammer spring getting out of line and possibly kinking the spring is all.... Just something to check if you haven't already.... 
Bob |
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_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal: Too many to count! |
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| Posted: Thu Dec 10, 2009 10:14 pm |
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| Mark5043 |
| Silver Status Member |
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| Joined: 12 Apr 2009 |
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| rsterne wrote: |
I have three questions for you....
Where is the end of the adjusting screw when you are at "coil bind"?....
This leads to question 2 - If you are screwing the adjuster out to the point where the end of the adjusting screw is past (or even flush with) the end cap.... what keeps the back end of the spring centered?....
The reason I ask is that on my velocity adjuster, the shoulder on the adjusting screw (3/8"-16NC) that the end of the spring sits against ends up flush or slightly forward of the end of the end cap when I'm at coil bind.... The adjusting screw has an integral guide forward of that shoulder to keep the spring centered....
In addition - Is the head of the plastic screw small enough to fit inside the end plug when you back off the adjuster?.... I ask because it looks significantly bigger than the spring....
You've come up with a simple and elegant solution.... I would just be concerned about the back end of the hammer spring getting out of line and possibly kinking the spring is all.... Just something to check if you haven't already....
Bob |
Good points.I did have to remove some material from the plastic screw head,with my Dremel to make it seat flush with the back of the end cap.At coil bind I have about a 1/4 inch or so of the adjustment screw protruding from the end cap."This is eyeballing it,and not an actual measurement".I see what your saying about the plastic screw moving too far forward of the end cap,and kinking the spring.It seems to be okay,as the bolt slides back nice,and smooth,and locks okay.Should I be concerned about wear to the sear,etc. using a power adjuster? |
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| Posted: Thu Dec 10, 2009 11:05 pm |
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| sniper |
| Silver Status Member |
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| Joined: 28 Nov 2008 |
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| Location: Star, Idaho |
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now i'm repeating myself......
EVERYONE WITH A PCP!!! BUY A DAMN CHRONY!!! |
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I believe in gun control,
If there's a gun around I
want to be controlling it....... |
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| Posted: Thu Dec 10, 2009 11:17 pm |
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| rsterne |
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| Quote: |
| At coil bind I have about a 1/4 inch or so of the adjustment screw protruding from the end cap |
That means you have nothing holding the back end of the spring centered.... I think there is a good chance it will get out of line and either kink the spring or at the least prevent you from cocking the gun.... Perhaps the plastic screw head has a depression in it from the adjuster rotating against it which might help prevent this.... perhaps not.... I personally wouldn't take the chance.... How about at least drilling a shallow recess in the plastic screw head so that it stays centered on the adjusting screw?....
I don't think you have to worry about wear on the sear, I use a stronger spring and haven't seen any wear.... The front of the hammer is hardened.... You should however, smooth and polish both of these surfaces.... You will be rewarded with a smoother let-off with less creep.... DON'T change the angles, just get rid of the ridge on the sear and smooth and polish to at least an 800 grit finish (shiny!)....
Bob |
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_________________
Dominion Marksman Silver Shield - 5890 x 6000 in 1976, and downhill ever since!
Airsonal: Too many to count! |
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| Posted: Fri Dec 11, 2009 1:13 am |
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| Mark5043 |
| Silver Status Member |
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| Joined: 12 Apr 2009 |
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| rsterne wrote: |
How about at least drilling a shallow recess in the plastic screw head so that it stays centered on the adjusting screw?....
Bob |
That is a good idea,and it did enter my mind while I was putting it all together.I think I'll tear it down in the morning,and see what is going on,and tailor it a bit...... |
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| Posted: Fri Dec 11, 2009 1:24 am |
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| Mark5043 |
| Silver Status Member |
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| Joined: 12 Apr 2009 |
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| sniper wrote: |
BUY A DAMN CHRONY!!! |
What...the "Holy cow the shots are way louder,and went through the padding,and dented the crap out of my pellet trap method doesn't work"?......   I know it's time to get one,and do it the right way.... |
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| Posted: Fri Dec 11, 2009 6:39 am |
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| Crosman140 |
| Senior Member |
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| Joined: 13 Dec 2008 |
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| Location: USA |
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| Mark5043 wrote: |
| sniper wrote: |
BUY A DAMN CHRONY!!! |
What...the "Holy cow the shots are way louder,and went through the padding,and dented the crap out of my pellet trap method doesn't work"?...... I know it's time to get one,and do it the right way.... |
I chrony mine with phone books. 
How fast was it? Fast!  |
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_________________
My Critter Gitters
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