[TowerTalk] Mast slippage

[Charles Gallo]

Cast Iron is “interesting”
If you get good grade cast iron, it machines like butter
If it is cooled rapidly, you get what they call chilled cast iron, which can be amazingly hard, like you either must aneal it or use a grinder (I had a casting I could not true up short of using a surface grinder)
In addition to the above, low grade stuff can be full of very very hard scrap (and is more likely to be chilled)

--  
73 de KG2V
Charlie

> On Jul 29, 2020, at 1:33 AM, K9MA <k9ma at sdellington.us> wrote:
> 
> After recently ruining several drill bits trying to drill through a cast iron fence post, I discovered there are carbide tipped bits for drilling metal. I haven't tried them on anything, let alone cro-moly, but they might work.
> 
> 73,
> 
> Scott K9MA
> 
> -- 
> Scott  K9MA
> 
> k9ma at sdellington.us
> 
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