[Shop-talk] angle grinder spindle adapter

[john niolon]

I have two Milwaukee grinders
a 6145 with a 
1/2"-13 spindle   and
a 6148 with a 5/8-11 spindle...

I can't find grinding rocks or cut off discs with a 1/2 arbor hole plus I have a large box full of 5/8"

I've looked for a spindle adapter for 5/8-11 to 1/2-13 and can't find one
I can find 5/8-11 to M10 1.25   and 5/8-11 to 3/8-24 

I wonder if any have found such
or
if I bought the 5/8-3/8 adapter  would there be enough meat in the 5/8 to 3/8 
to bore and tap to 1/2-13

that would be for a qualified person to drill/tap...   I'm not qualified or have the tools to do it
I would think the most precise way would be on a lathe, right ??


suggestions ??

thanks
john
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