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Rifles, Reloading, Optics, Equipment
Long Range Scopes and Other Optics
Budget Scope Advice
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<blockquote data-quote="westcliffe01" data-source="post: 791035" data-attributes="member: 35183"><p>Well, it just so happens that I work with steel too, mostly stainless steel.</p><p></p><p>But to answer your claims, I compared 6061T6 to cold drawn 1018 steel</p><p></p><p>6061 T6 Hardness, Rockwell B 60</p><p>1018 Hardness, Rockwell B 71</p><p></p><p>6061 T6 Tensile Yield Strength 276 MPa / 40000 psi</p><p>1018 Tensile Yield Strength 370 MPa / 53700 psi</p><p></p><p>6061 T6 Modulus of Elasticity 68.9 GPa / 10000 ksi</p><p>1018 Modulus of Elasticity 205 GPa / 29700 ksi</p><p></p><p>6061 T6 Shear Modulus 26 GPa / 3770 ksi</p><p>1018 Shear Modulus 80.0 GPa / 11600 ksi</p><p></p><p>Looks to me, particularly looking at the tension and shear modulus, that the values for 1018 are basically 3x the value for 6061-T6. That means that steel is 3x stiffer with 1/3 of the deflection of aluminum. Since any part of the scope mounting system will be working within its elastic range, deflection is going to be the primary consideration.</p><p></p><p>So where is your "twice as strong" data ? It looks rather like 1/3 as stiff to me, as an engineer ? I haven't heard of anyone making scope bases out of 2024 because of the corrosion problems. It will match steel in tension, but the Modulus and therefore deflection are no better than 6061.</p><p></p><p>You have any data to prove your point ? Mine came from matweb.com</p></blockquote><p></p>
[QUOTE="westcliffe01, post: 791035, member: 35183"] Well, it just so happens that I work with steel too, mostly stainless steel. But to answer your claims, I compared 6061T6 to cold drawn 1018 steel 6061 T6 Hardness, Rockwell B 60 1018 Hardness, Rockwell B 71 6061 T6 Tensile Yield Strength 276 MPa / 40000 psi 1018 Tensile Yield Strength 370 MPa / 53700 psi 6061 T6 Modulus of Elasticity 68.9 GPa / 10000 ksi 1018 Modulus of Elasticity 205 GPa / 29700 ksi 6061 T6 Shear Modulus 26 GPa / 3770 ksi 1018 Shear Modulus 80.0 GPa / 11600 ksi Looks to me, particularly looking at the tension and shear modulus, that the values for 1018 are basically 3x the value for 6061-T6. That means that steel is 3x stiffer with 1/3 of the deflection of aluminum. Since any part of the scope mounting system will be working within its elastic range, deflection is going to be the primary consideration. So where is your "twice as strong" data ? It looks rather like 1/3 as stiff to me, as an engineer ? I haven't heard of anyone making scope bases out of 2024 because of the corrosion problems. It will match steel in tension, but the Modulus and therefore deflection are no better than 6061. You have any data to prove your point ? Mine came from matweb.com [/QUOTE]
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