Re: [ATM] (not) grinding with diamond

[Douglas S Angle <Douglas.S.Angle@can.dupont.com>]

James Crombie wrote:
> The new blade may be clogging and need to be cleaned with a aluminum 
oxide 
dressing stick to expose the diamond grit.

I tried this on both blades.  The diamond easily cut through the dressing 
stick.  It also easily cut a piece of scrap glass held freehand against 
the cutting surface.

> Try using a permanent marker on the blade to see if there is any rubbing 

of the steel or aluminum of the blade on the glass.

I haven't tried marker yet.  There are no wear marks on either the steel 
or aluminum blade, except possibly right at the edge where the blade meets 
the diamond.  I was expecting that the blade would only cut on the extreme 
edge, so this portion wouldn't be in contact, but there may be enough flex 
in the system.  I'll try the marker tonight to get a better idea of where 
there's contact.  If it is rubbing on the non-diamond portion, what do I 
do about it?  I undercut as much as I could on the second blade, using a 
scraper on a wood lathe.  I don't have the means to machine the steel one.

> Normally on a surface grinder this blade would run at 1500 -2000 
> rpm and would grind very small amounts, .0002" per pass. 

Should I speed it up?

Scott Milligan wrote:
> I suspect that the diamond matrix has become clogged with glass frit, 
and
> needs to be dressed to return to the initial performance you say you had
> gotten. 

See above

> Pyrex is somewhat notorious for clogging up diamond tooling.

Good to know because the next job will be pyrex.  However the current one 
is plate.

Thanks,
-Doug

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