Re: Pinging Harold & Susan


"Ed Huntress" <huntres23@xxxxxxxxxxxxx> wrote in message news:...

"Harold and Susan Vordos" <vordos@xxxxxxx> wrote in message
news:LcScj.41179$G23.13344@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx

"Ivan Vegvary" <ivan@xxxxxxxxxx> wrote in message
news:MmRcj.2734$si6.1329@xxxxxxxxxxx
Hi Harold,

I followed your thread regarding diamond vs. silicon wheels. One point
of confusion. Steel should not be ground on diamond. How come the
Drill Doctor and my el-cheepo knife sharpener use diamond impregnated
wheels? Is it simply a matter of short life time and I buy a replacement
wheel? Or there alternative cutters for consumer quality products?

Thanks,

Your Jazz listening buddy from Oregon
Ivan Vegvary


I think you'll notice that the surface speed of these devices is well
below a critical threshold.
Where the problems begin is at red heat. If diamond is run on steel
at low surface speed, such that it doesn't get hot----no problem. Once
up to the heat of ignition, however, carbon begins transferring to iron,
which has an affinity for carbon. This process rapidly dulls diamond. If
you touch the base metal of brazed carbide tools to the diamond wheel (it
happens occasionally), there is an almost instant change in grinding
characteristics. It can be attributed to some loading of the wheel, but
the diamond is also dulled in the process. The wheel often requires
dressing to restore its qualities.

How do you dress diamond wheels? I wasn't aware they could be dressed, but
I've never had much to do with them, except for some old castoffs I
salvaged.

Oh, wait a minute. Are you talking about using a single-point diamond to
dress diamond wheels on a surface grinder? That I've seen. I was thinking
about the wheels on a bench grinder. Can you dress them the same way?

--
Ed Huntress


.

Relevant Pages

  • Re: tool grinding
    ... green or diamond wheels on steel. ... well/long machining steel. ... Biggest single tip is to keep your wheels "dressed" so they will ...
    (rec.crafts.metalworking)
  • Re: Plus one for ALDI and nearly minus one for ALDI
    ... brand-name wheels. ... Diamond is diamond after all so I ... inboard for things like nicking the inner cutting edge of end mills ... If you stick to 100 mm wheels they cost about 10 quid up to 17 quid ...
    (uk.rec.models.engineering)
  • Re: Carbide Pedestal / Bench Grinders
    ... for diamond wheels. ... with "green" wheels. ... adustable table) or lap by hand with diamond hone or fucking concrete ... shit & keep'em in the dark) ...
    (alt.machines.cnc)
  • Re: Plus one for ALDI and nearly minus one for ALDI
    ... better than it should be cutting four year old concrete with flint+quartz ... about half as long as one of my £40 brand-name wheels. ... faithful old Cronos diamond cup wheel but the edge is a tad rounded so you ... If you stick to 100 mm wheels they cost about 10 quid up to 17 quid ...
    (uk.rec.models.engineering)
  • Re: tool grinding
    ... > sharpen tool steel on a green wheel. ... I'm thinking about getting a diamond ... Diamond wheels should never be used for grinding steel or iron unless the ... Green wheels are silicon carbide, and, like diamond wheels, are readily ...
    (rec.crafts.metalworking)
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