the best way to remove rivets from frames etc is to use a HSS drill bit of  
aprox 3 to 4mm diameter. with an electric drill at about 1600rpm or  to  
2000rpm. be gentle with the bit as they do become delicate and hot and make 
sure  
you grip the drill well as spiraling  can occur and can damage the drill or  
you.
 
if its drilling rivets from sheet steel  or quarter plate then use a  HSS 
drill about the same diameter as the rim of the rivet and drill carefully.  
most 
of the time I would advise using a 4mm bit for most rivets to cut through  the 
centre .
 
hope this helps
 
lew


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