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Rifle Scopes How does the USO EREK knob work… is it Magic?

gunlove

gunlove

Sergeant
Full Member
Minuteman
Oct 6, 2007
259
15
40
Ft. Campbell, KY
#1
How does this mysterious EREK knob actually work?

Maybe if I actually understand how this damn thing works, I would have less trouble! Like many people I think my EREK knob must be a lemon (and this is my 3rd). Or perhaps it is really magic. If it is, USO should really have told us about it, so that we could perform the needed atonements, light the correct incense, say the right prayer, or whatever it is that needs to be done to make our EREK knob happy with us.

I have heard the EREK enables the shooter maximize elevation adjustment. How can this be? I would think elevation would be straight forward; the erector goes up to the top of the tube and down to the bottom. So, how can the EREK give the user more elevation than this?

My Procedure:
1. Set the knob to bottom out
2. Loosened the 2x cover screws and adjusted the dial to read zero.
3. Used the center screw with the allen wrench to adjust my 100 yard zero.

My Result (failure):
My shot group was about 5 inches low and using the center screw I couldn’t get the reticle low enough (while the knob was bottomed out). By low I mean: I kept the rifle mounted solidly on target and watched the reticle travel down toward my shot group. Note, I didn’t have to hold this EREK knob in order to turn the center screw, unlike the other two I own. The center screw didn’t stop turning but the reticle halted on its way down toward the shot group. I turned it about another quarter turn without the reticle moving and it made a horrible sound! So I stopped that. I figured if the knob is really magic, it must have really been mad then. I went back the other way with the center screw and the reticle sat still for the same fraction of the turn and then picked up and started moving up again.
5-25x Milestone Erek on a Surgeon 591 action (20 MOA), USO 34mm rings 1.13"

Pictures or Diagrams would be Awesome!

I read the shitty directions (I still don’t know what a collimater is or if am I supposed to have one) and watched the videos:
http://www.shootingvoodoo.com/index.php/videos/
http://www.youtube.com/watch?v=uRruWk9eZpw&feature=player_embedded#at=13
http://www.youtube.com/watch?v=CUU7iyl1aFE
http://www.youtube.com/watch?v=-zyaQrQ0K8U
 
#2
Re: How does the USO EREK knob work… is it Magic?

I adjust the knob to bottom out then go .5 MIL's up. Then I used a laser boresight to get an initial zero, I just held the knob and using the cover with the hole in the center adjusted the erector screw with an allen wrench. I made the final adjustments on paper and was done.
 
#4
Re: How does the USO EREK knob work… is it Magic?

When a scope is received new, I insert allen into erector, then hold that and turn to bottom plus one mil. Then I use the center to zero while holding outer.

If you don't set the knob to bottom out while holding the erector you are just bottoming the erector out like a normal scope. If you do that and have to start over "spin" the scope in and start over.


http://vimeo.com/13563857
 
#5
Re: How does the USO EREK knob work… is it Magic?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: sobrbiker883</div><div class="ubbcode-body">
http://vimeo.com/13563857
</div></div>

I don't even have one and that seemed pretty damn strait forward to me.
 
#6
Re: How does the USO EREK knob work… is it Magic?

How does this mysterious EREK knob actually work?
I do not have one, but here's what I thank. To adjusted the dial to read zero & line up the Hash marks on the scope. The magic is in the name EREK, T-PAL, ect!
 
#7
Re: How does the USO EREK knob work… is it Magic?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tipper</div><div class="ubbcode-body">How does this mysterious EREK knob actually work?
I do not have one, but here's what I thank. To adjusted the dial to read zero & line up the Hash marks on the scope. The magic is in the name EREK, T-PAL, ect! </div></div>

You "thank" a little off.....

The EREK stands for <span style="font-weight: bold">E</span>rector <span style="font-weight: bold">RE</span>positioning <span style="font-weight: bold">K</span>nob. You can adjust the outer knob independent of the actual erector's travel. Simply put, you can put the outer knob so that it only turns "up" and bring the reticle's point of aim to the point of impact by adjusting the erector cell directly while holding the outer knob still leaving the scope with only as much "down" adjustment available as you wish, and the rest being all "up". Comes in handy.

Now I remember why the name's familiar! You were posting crap in my for sale thread a while back with the same level of ignorance...
 
#8
Re: How does the USO EREK knob work… is it Magic?

I think when you go with the larger tube diameters, the EREK won't always be able to adjust for zero with the knob bottomed out.

I had one on a 30mm tube and it worked fine. A friend's 35mm scope doesn't have enough adjustment in the screw to get a zero with the knob bottomed. He runs it with the screw all the way out, and the knob just ends up where it does. In his case, I think it hits zero at around 1/4 to 1/2 turn from where the knob bottoms.

I think you'll just have to do the same, but you could ask USO what they recommend.
 
#9
Re: How does the USO EREK knob work… is it Magic?

My two 35mm's run just fine set up as directed (as do scottmilk9's. Tim3gun's, 00MGN's, LH Gina's, most of the Sin City Precision guy's, etc...).

If your friend's 35mm is having problems like that he should contact USO. The entire reason to get the 35mm tube over a 30mm is for the adjustment range.
 
#10
Re: How does the USO EREK knob work… is it Magic?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: sobrbiker883</div><div class="ubbcode-body">My two 35mm's run just fine set up as directed (as do scottmilk9's. Tim3gun's, 00MGN's, LH Gina's, most of the Sin City Precision guy's, etc...).

If your friend's 35mm is having problems like that he should contact USO. The entire reason to get the 35mm tube over a 30mm is for the adjustment range.</div></div>

last 35mm I had was a total of 120 moa
 
#12
Re: How does the USO EREK knob work… is it Magic?

When I was trying to zero my first SN-3 EREK and was having trouble, I called USO right from the range and they talked me through it.

 
#13
Re: How does the USO EREK knob work… is it Magic?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: DWood</div><div class="ubbcode-body">When I was trying to zero my first SN-3 EREK and was having trouble, I called USO right from the range and they talked me through it.

</div></div>

Same, same
 
#14
Re: How does the USO EREK knob work… is it Magic?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: DWood</div><div class="ubbcode-body">When I was trying to zero my first SN-3 EREK and was having trouble, I called USO right from the range and they talked me through it. </div></div>
<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Kombar</div><div class="ubbcode-body">I think when you go with the larger tube diameters, the EREK won't always be able to adjust for zero with the knob bottomed out.</div></div>

I actually called USO from the range yesterday. They told me to consider a 200+ yard zero. …However, I am not convinced of this yet.
I can set a zero about 1/3 before the knob bottoms out. From there is has tons of the reticle down travel necessary for long range (using the large knob). However, when the knob is bottomed and I am using the center screw, I can’t the reticle down far enough.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: sobrbiker883</div><div class="ubbcode-body">When a scope is received new, I insert allen into erector, then hold that and turn to bottom plus one mil. Then I use the center to zero while holding outer.
If you don't set the knob to bottom out while holding the erector you are just bottoming the erector out like a normal scope. If you do that and have to start over "spin" the scope in and start over.
http://vimeo.com/13563857
</div></div>

I will definitely try this next trip to the range. But I would really like to know how it works. I thought the EREK was merely an independent way to adjust elevation. However, it seems to be more complex.

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: XxMerlinxX</div><div class="ubbcode-body">Have you tried an animal sacrifice? </div></div>
I should probably do this too; I believe my neighbor may have a spare dog.
 
#15
Re: How does the USO EREK knob work… is it Magic?

Here's what I imagine...
EREKKnob.jpg
 
#17
Re: How does the USO EREK knob work… is it Magic?

My EREK knob almost cost me my sanity. I spent 3 range sessions trying to get it set (about 6 clicks up from bottomed out). I'd go back home, put the solid cover on it, and the knob would spin freely without any clicks.

I finally figured out that the center screw was contacting the bottom of the solid knob cover. I called USO and asked them to pull a new cover from stock, and see if there was a recess machined into the bottom of the cover above the center adjustment screw (mine didn't have the recess). There was, and they sent me the replacement cover.

Now my "magic knob" works perfectly.
 
#18
Re: How does the USO EREK knob work… is it Magic?

Gunlove,

I think I spoke to you yesterday. I did not know you bottomed out your knob and tried to go from there.
1. Turn your erek counterclockwise all the way till it stops
2. Turn your center screw counter clockwise until you meet resistance
3. Move your centerscrew clockwise while looking through the scope until you notice the reticle start to move then stop.
4. Turn your knob clockwise until it stops.

Now from here I think you didn't want any "down" travel so from here you should be good to go with maximum travel out of your scope. If you still have problems e-mail me at [email protected]. I get e-mails on my phone if your at the range give me a phone number and I will shoot you a call so we can get this squared away.

Jason
 
#19
Re: How does the USO EREK knob work… is it Magic?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: XxMerlinxX</div><div class="ubbcode-body">Have you tried an animal sacrifice? </div></div>

Now that was funny.
 
#20
Re: How does the USO EREK knob work… is it Magic?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ssgtkyle</div><div class="ubbcode-body">Gunlove,

I think I spoke to you yesterday. I did not know you bottomed out your knob and tried to go from there.
1. Turn your erek counterclockwise all the way till it stops
2. Turn your center screw counter clockwise until you meet resistance
3. Move your centerscrew clockwise while looking through the scope until you notice the reticle start to move then stop.
4. Turn your knob clockwise until it stops.

Now from here I think you didn't want any "down" travel so from here you should be good to go with maximum travel out of your scope. If you still have problems e-mail me at [email protected]. I get e-mails on my phone if your at the range give me a phone number and I will shoot you a call so we can get this squared away.

Jason </div></div>

So if I mount this scope on a rifle and use 20moa or 5.5MIL up travel to get a 100yd zero, the EREK adj. can be used to gain the 20MOA of up back an not loose my zero?
 
#21
Re: How does the USO EREK knob work… is it Magic?

tipper


Do you have a boresighter? It can be achieved or very close to it. Are you mounting the scope on a flat rail?
 
#22
Re: How does the USO EREK knob work… is it Magic?

Yes mounting the scope on a flat rail, would like to stay in the working center of travel an not bottom the it out up or down.
 
#23
Re: How does the USO EREK knob work… is it Magic?

Are you local? Typically we set up our scopes with 20 MOA down unless the customer tells us they are mounting it on a flat rail. If your local you could bring it in and we can set you up.
 
#24
Re: How does the USO EREK knob work… is it Magic?

I also had trouble with mine setting it up. Really wasnt a big problem there was some difference in the top cap plate. the screws were not catching enough threads with the orings installed. uso sent me a new cap and screws and all is well.I do understand that the instructions seem confusing at first but you must just visualize what is taking place when you do this process.
 
#25
Re: How does the USO EREK knob work… is it Magic?

gunlove -

Consider the EREK with milestone on your next USO. It's the same knob but has a harder detent every 10th click. I have it on mine and love it. If you make it to the Juniper Swamp Match you can check mine out. It's awesome!

I zero mine 1 mil low and then dial up 1 mile to zero. The EREK w/ milestone makes it a piece of cake and it's super fast.

Welcome to NC btw!
 
#27
Re: How does the USO EREK knob work… is it Magic?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: THEBEARRRRRRJEW</div><div class="ubbcode-body">Turn right to go up, turn left to go down.
wink.gif
</div></div>

You talking POI or POA?

OP-Its just a little bit of science, not rocket science. Let Jason help you when you have it in hand at the range.
 
#28
Re: How does the USO EREK knob work… is it Magic?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: THEBEARRRRRRJEW</div><div class="ubbcode-body">Turn right to go up, turn left to go down.
wink.gif
</div></div>

No shit..

you are a helpful one aren't you
 
#29
Re: How does the USO EREK knob work… is it Magic?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ssgtkyle</div><div class="ubbcode-body">Gunlove,

I think I spoke to you yesterday. I did not know you bottomed out your knob and tried to go from there.
1. Turn your erek counterclockwise all the way till it stops
2. Turn your center screw counter clockwise until you meet resistance
3. Move your centerscrew clockwise while looking through the scope until you notice the reticle start to move then stop.
4. Turn your knob clockwise until it stops.

Now from here I think you didn't want any "down" travel so from here you should be good to go with maximum travel out of your scope. If you still have problems e-mail me at [email protected]. I get e-mails on my phone if your at the range give me a phone number and I will shoot you a call so we can get this squared away.

Jason </div></div>

Will try the next range session; probably tomorrow.
 
#30
Re: How does the USO EREK knob work… is it Magic?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: THEBEARRRRRRJEW</div><div class="ubbcode-body">Turn right to go up, turn left to go down.
wink.gif
</div></div>

You could also try:
Up, down, up, down, left, right, left, right, A, B, A, B, select, start.
 
#35
Re: How does the USO EREK knob work… is it Magic?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: gunlove</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: THEBEARRRRRRJEW</div><div class="ubbcode-body">Turn right to go up, turn left to go down.
wink.gif
</div></div>

No shit..

you are a helpful one aren't you

</div></div>

lol no need to get testy. It can only go 4 directions. Trial and error, man
 
#37
Re: How does the USO EREK knob work… is it Magic?

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: ssgtkyle</div><div class="ubbcode-body">Gunlove,

Awesome.. I will try and find a schematic at work tomorrow and post it on here. </div></div>



I would like to see one posted.
 
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