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Re: [ATM] Another machining question, please

Yes, you can use a forstner bit on aluminum, just keep it well lubricated with oil and go slowly, 
   
  or...
   
  You can use a COUNTERBORE which is designed for the metalworking job. See:
   
  http://cgi.ebay.com/AIRCRAFT-Counterbore-15-16-x-3-16-NEW-in-BOX-32-67valu_W0QQitemZ190082145190QQihZ009QQcategoryZ12578QQssPageNameZWDVWQQrdZ1QQcmdZViewItem
   
  for one item of this type. With this one, you will need to put in a 3/16 pilot drill or bushing to accurately align the hole but if the workpiece is clamped down well enough and the drill press is robust enough, you can sometimes do without the center drill/bushing... 
   
  I recommend this not be done unless you would class the job an "emergency" and not make a regular practice of using a counterbore this way.
   
  Ken Hunter
   
  

Thomas A Simmons <tasimmons@raytheon.com> wrote:
  I want to have 3 flat bottom holes ~ 3/4 to 7/8 inch in 6061 Aluminum. I
don't have access to a lathe


or mill, but do have a benchtop drill press.Could I drill the holes to
depth with common metal drill bits


and then run a Forstner bit down after it? All I really need flat is a 3/16
inch lip for a nut to rest on. I would


assume this would ruin the Forstner bit...





Since I'm effectively "homebound now" due to medical issues, taking it
locally to a machine shop or


shipping it anywhere isn't going to work.





Tom


Too stubborn to quit being an ATMer

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