[drivingpairs] Brass versus bronze bits.

Brass and Bronze are both alloys, therefore mixtures or metals. These  
mixtures can vary from manufacturer to manufacturer, and from time period to  
time 
period. Brass is softer than Bronze.
I have several bronze side piece bits with stainless steel mouth  pieces.
I have seen a brass bit break at the side piece and have had a brass buxton  
bend.
However, I have also seen several stainless steel three slot  liverpools 
fracture where the metal at the first slot was thin. I will only use  those 
with 
two slots.
 
Any metal alloy can be made hard or soft, or brittle. A good metallurgist  is 
needed to do so. Casting techniques can also affect the quality of a cast  
metal piece.
 
Kris Breyer

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