Re: [CAD_CAM_EDM_DRO] Re: sourcing motion control parts - steel vs aluminum

Hello friends

I have one ( think helpful suggestion). I am designing some industrial mechanical application. There are very important stiffness.

Ron, Aluminum isn�t significant problem because if you have some problem with it I can organize some aluminum detail in Poland (manufacturer have lowest price) but:

Lets assume that we want to compare two beam aluminum VS steel with following dimension: 100x80 (mm)

WE DON�T CARE AT STRENGTH OR STRESS IN CONSTUCTION !!!!!!!!! first of all we need high stiffness (precision and low time of working) and other condition automatically will be realized.

The Young Modules for steel is 300% higher than for aluminum alloy (steel 21e10 and aluminum alloy type 6xxx: 6.9e10)

But the density of steel is about 290% higher than for aluminum alloy.( 7.9 VS ~2)

Conclusion:

When we use the same general dimension of profile and:

For example 1 mm thick for steel beam the mass will be almost the same when we use 3 mm thick(300%) for the same general dimension aluminum alloy profile. And mass of both will be almost the same and stiffness will be the same to!!

If you see the specialist machines like robots and you see that they are made form aluminum. Remember: that is not alloy aluminum type 6xxx( standard) or 7xxx( really hard for airplanes construction), generally you can get only this types of profiles. For very fast machines like your or robots they use special type of aluminum alloy like Aluminium+Beryl. (they do this only for special order).



Generally don�t lose the time. Use steel profile because this is much cheaper and mechanical effect is the same. If you want use aluminum lets do that but generally for nice appearance ;)


Mat.

turbulatordude <davemucha@...> wrote:

--- In CAD_CAM_EDM_DRO@yahoogroups.com, R Rogers
wrote:

> Considering the cost and compromise in strength, I would opt for

some steel square tube and a buddy with a welder. The aluminum
extrusions do look nice though and probably ample for a small gantry
router.

> Ron
>

I ran thru this when I designed a router table.

The small table top units are about equal with a lot less finish time
for the 80/20

When you get into a 4x8ft table and need 20 pieces 4 foot long at $12
a foot, you see a 4 digit price very quickly.

Dave







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