[ATM] Re: Types of Aluminum

[James P Crombie <jpcrombie@pei.eastlink.ca>]

  As has been said, there are many types of aluminum.  For most project 
for the ATM, 6061 is probably the best choice.  If you picked the sheet 
of aluminum up from a fabrication shop it may be a 1000 series alloy.  
Mainly pure aluminum that is easy to bend and weld to but a real pain to 
drill and machine.  It is extremely gummy when drilling or milling and 
tears chunks out while doing so.  It is mainly procesed by shearing or 
punching.
http://www.efunda.com/materials/alloys/aluminum/aluminum.cfm
  As to the remarks on steel pricing, I have noticed it as well.  When 
pricing some stainless steel bar stock, I was informed there is a 10% 
surcharge on it, to cover the rising cost of nickel and chrome in it.  
It has gotten worse since then and I have been told that there are 
surcharges being applied to mild steel now as well.  Hopefully the 
pricing on aluminum will not get as bad.

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