I recently cut thru a bunch of spot welds using an Eastwood spot weld cutter.
One thing I did was to use some 3-in-1 oil as a lubricant for the but. I
figure that if they use lubricants and cooling fluids on machine tools, it
will help preserve the bit.
I'm still using the original bit after 30-40 welds, so it must have done some
good.
I did buy a small pumch to dimple the weld center prior to using the Eastwood
tool. I found this helps keep the tool centered until the bits have carved a
path in the metal. This is also helpful on welds on curved surfaces.
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