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Tube Thickness

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/07/2009 at 23:12
donlipa View Drop Down
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Does anyone know the general specs for the thickness and type of alloy of the metal tubes of say the Monarch vs. VX-III vs. Elite 4200 vs. Conquests etc.  Just wondering if there is anything to different brand's durability claims.  I'm talking thickness of the steel wall not tube diameter.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/08/2009 at 08:04
Horsemany View Drop Down
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I don't know the specifics but I will tell you the tubes are aluminum not steel.  One indicator of tube thickness may be to look at the weight in similar sized scopes.  For instance if you find 2 brands that are both 44mm with similar length and no AO compare the weight.  That might tell you something.  There was a thread going here about whether heavier or lighter scopes were more durable under the forces of recoil.  AFAIK Burris makes some of the most robust tubes made.  I've toured the plant and watched them machine the tubes from solid aluminium stock.  Burris scopes are usually quite heavy compared to other scopes too.  Unfortunately they don't have as good of optics as the models you asked about IMO.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/08/2009 at 08:32
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 Just a little hard to comprehend how just slightly thicker walls of aluminum would add any significant weight to a rifle scope.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/08/2009 at 10:49
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If the aluminum is 6061 (T6), it will have a density of about 2.7gm/cc. Lets assume a 30mm tube, a 50mm objective, a total length of 12.5 inches. If we let the objective/eye piece be 1/2 of the length of the scope, we can make a SWAG about the weight of the housing vs wall thickness.

With these factors, a one millimeter wall thickness would have a total weight of about 1.9 ounces. A two millimeter wall thickness would have a total weight of about 3.8 ounces and a three millimeter wall a weight of about 5.7 ounces.

The Zeiss website shows their Diavari 2.5-10x,50 scope to have a 56mm diameter for the objective housing; a 3mm wall thickness. The weight is listed as 15.9 ounces. These scopes use Fluorite lenses, which is lighter than glass.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/08/2009 at 12:50
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Got it.  So different glass can affect weight as much or more than wall thickness. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/08/2009 at 13:25
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There is a lot more glass in a scope than aluminum alloy, so that would be the primary source of weight.

Then you also have to keep in mind that some mounting and adjustment components are made of much heavier  materials, like brass and/or stainless steel.  Although these components are comparatively small, they add some weight.

If anything, from weight stand point tube thickness is the least of your concerns.

ILya
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/08/2009 at 16:05
Horsemany View Drop Down
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Koshkin
 
Got any ideas for the OP?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/08/2009 at 16:14
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Originally posted by Horsemany Horsemany wrote:

Koshkin
 
Got any ideas for the OP?


OP???

ILya
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/08/2009 at 16:24
Horsemany View Drop Down
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The "original poster".  Do you have any ideas how he could deduce which scopes have thicker tubes?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/08/2009 at 16:49
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Big and heavy tactical scopes will tend to have thicker tubes: Nightforce, etc.

You can get some idea by looking a the thickness of the wall around the objective lens.  Still, it varies a little as you get to different sections of the scope.

Generally speaking, thickness of the tube walls taken as a standalone parameter is one of the least important factors in scope durability (within certain limits of course).  Most scope failures have nothing to do with scope tube thickness.  It is all about the quality and design of internal components.

ILya
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/08/2009 at 17:01
Horsemany View Drop Down
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[QUOTE

Generally speaking, thickness of the tube walls taken as a standalone parameter is one of the least important factors in scope durability (within certain limits of course).  Most scope failures have nothing to do with scope tube thickness.  It is all about the quality and design of internal components.

ILya
[/QUOTE]
 
I couldn't agree more.  In fact some lightweight scopes are known for their durability according to some.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/08/2009 at 17:13
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....if you need thicker walls on your tube take some Viagra?


                                           Shocked        sorry couldn't help it.


Edited by rifle looney - January/08/2009 at 17:13
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: January/08/2009 at 17:17
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Speedy    Good thinking.
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