Possible to use quick extrusions high-precision assembly?

[Etienne_the_industrial]

Hi all,

As most of you know, quick aluminum extrusions are great to save design and manufacturing time, but have some downside in term of quality level and durability (screws tend to losen-up overtime) (see "Design A" as typical quick extrusions and bracket that can be bought on McMaster)


In "Design A", positioning of the 90' bracket in the groove is done by a "straight locator" creating a slack of 0.025''


In "Design B", positioning of the 90' bracket in the grove is done by a "tapered locator" eliminating the slack as the screw is tighten.


If "quick extrusions" were done like "Design B" could we use them for high-precision machines (e.g., CNC machine) or tooling?


Thoughts?

 

[JohnRBaker]

I suspect that this item should be posted in a different forum. This one covers Drafting Standards and such, while your question would better fit a forum like this:

http://www.eng-tips.com/threadminder.cfm?pid=404

John R. Baker, P.E. (ret)
EX-Product 'Evangelist'
Irvine, CA
Siemens PLM:
UG/NX Museum:

The secret of life is not finding someone to live with
It's finding someone you can't live without

 

[Etienne_the_industrial]

Thanks John,