[TheForge] Binders on Abrasive wheels

[Peter Fels & Phoebe Palmer]

Good thinking! Makes sense.
But the lead lined central hole is at least 1",
so unless this wheel is a worn down remnant of a much larger wheel,
it probably wasn't for a hand crank grinder. 
Low RPM overhead line shaft or pedal power is a possibility,
but this seems to be a uniform manufactured wheel ,
rather than an old  one of natural stone.

On Oct 12, 2013, at 10:14 AM, Charles wrote:

It might have been designed for a hand crank grinder where there is less speed and pressure and where its free cutting properties would be very welcome.   

Charles


________________________________
From: Peter Fels & Phoebe Palmer <artgawk at thegrid.net>
To: Charles <xlch58 at swbell.net>; Blacksmithing List Sponsored by ABANA <theforge at mailman.qth.net> 
Sent: Saturday, October 12, 2013 11:41 AM
Subject: Re: [TheForge] Binders on Abrasive wheels


That's certainly what's going on here Charles.
Never saw one as soft though.

On Oct 12, 2013, at 9:20 AM, Charles wrote:

The binder varies depending on how fast of a cut the wheel is designed for.  A real fast cutting wheel can have a soft binder.  This means new edges are being presented constantly rather than having to wear through dull edges on the cutting particles. 

Charles 


________________________________
From: Peter Fels & Phoebe Palmer <artgawk at thegrid.net>


Query: I pulled an old ( don't know how old...WW2 old?) 8"X1" grinding wheel out , dug up
some centering hardware and hung it on my bench grinder.
It cuts gratifyingly quickly on hard steel!!     It also wears really fast!
Looks to be around 60 grit with darkish grains in a grey matrix.
I'm wondering if the binder has gotten soft with age and it's dangerous?
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