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Posted by the wizard on May 26, 2008, 6:42 am
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Hi to all you knowledgable and helpful people,
Enough buttering up, is there someone out there with an Eagle surface
grinder. I bought one yesterday without handbook or grinding wheel,
but at a very advantageous price.
The question is, what size wheel is "standard" and for that matter
what grit/bonding mix.do I need for good finish on steel, The grinder
will not be used in a commercial time constraint situation, so stock
removal rates are less important than finish accuracy and appearence.
Suggestions as to where I can get a copy/scan/loan of the handbook,
anyone?
Thanks in advance.
T,W
,
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Posted by Peter Neill on May 26, 2008, 7:06 am
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On Mon, 26 May 2008 03:42:08 -0700 (PDT), the wizard
>Hi to all you knowledgable and helpful people,
>Enough buttering up, is there someone out there with an Eagle surface
>grinder. I bought one yesterday without handbook or grinding wheel,
>but at a very advantageous price.
>The question is, what size wheel is "standard" and for that matter
>what grit/bonding mix.do I need for good finish on steel, The grinder
>will not be used in a commercial time constraint situation, so stock
>removal rates are less important than finish accuracy and appearence.
>Suggestions as to where I can get a copy/scan/loan of the handbook,
>anyone?
>Thanks in advance.
>T,W
>,
Standard wheel size is 7" x1/2" x1.25" bore (180 x 13 x 31.75mm),
however if you want to use a thinner wheel, you will need to make a
new hub clamp disc, as on the Eagles these tend to be specific for the
width of the wheel - important to check.
Check the wheel rotation too, (should be anti-clockwise IIRC) as the
hub clamp is held on with a normal right hand threaded nut.
As for wheel grit types, there is as much debate here as the HSS vs
Carbide debate. In general, a harder steel needs a softer wheel, and
vice versa. A 46 grit size is a good general standard to start with,
in a 38A or WA (white alumdum) material in perhaps an H hardness.
Lots of good information direct from Norton in the following link:
http://www.ind.nortonabrasives.com/Data/Element/Node/ProductLine/product_line_edit.asp?ele_ch_id=L0000000000000003789
Do be careful if you're new to grinding though, as IMO a grinder can
be one of the msot dangerous machines in the workshop.
Small light cuts (0.003" is a large cut), don't feed too fast (or too
slow), and about 0.010"- 0.015" crossfeed will give a nice finish.
And always find the high-spots first before you index a grind across
the whole part.
IIRC the handwheel for feeding the knee is indexed in half thou'
divisions.
Peter
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Posted by the wizard on May 26, 2008, 7:39 am
Please log in for more thread options > On Mon, 26 May 2008 03:42:08 -0700 (PDT), the wizard
>
> >Hi to all you knowledgable and helpful people,
> >Enough buttering up, is there someone out there with an Eagle surface
> >grinder. I bought one yesterday without handbook or grinding wheel,
> >but at a very advantageous price.
> >The question is, what size wheel is "standard" and for that matter
> >what grit/bonding mix.do I need for good finish on steel, The grinder
> >will not be used in a commercial time constraint situation, so stock
> >removal rates are less important than finish accuracy and appearence.
> >Suggestions as to where I can get a copy/scan/loan of the handbook,
> >anyone?
> >Thanks in advance.
> >T,W
> >,
>
> Standard wheel size is 7" x1/2" x1.25" bore (180 x 13 x 31.75mm),
> however if you want to use a thinner wheel, you will need to make a
> new hub clamp disc, as on the Eagles these tend to be specific for the
> width of the wheel - important to check.
> Check the wheel rotation too, (should be anti-clockwise IIRC) as the
> hub clamp is held on with a normal right hand threaded nut.
>
> As for wheel grit types, there is as much debate here as the HSS vs
> Carbide debate. In general, a harder steel needs a softer wheel, and
> vice versa. A 46 grit size is a good general standard to start with,
> in a 38A or WA (white alumdum) material in perhaps an H hardness.
>
> Lots of good information direct from Norton in the following link:http://w=
ww.ind.nortonabrasives.com/Data/Element/Node/ProductLine/prod...
> Do be careful if you're new to grinding though, as IMO a grinder can
> be one of the msot dangerous machines in the workshop.
> Small light cuts (0.003" is a large cut), don't feed too fast (or too
> slow), and about 0.010"- 0.015" crossfeed will give a nice finish.
> And always find the high-spots first before you index a grind across
> the whole part.
>
> IIRC the handwheel for feeding the knee is indexed in half thou'
> divisions.
>
> Peter
Cheers for that Peter, I knew interwebb would come in handy one day.
T.W.
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Posted by Christopher Tidy on May 26, 2008, 4:13 pm
Please log in for more thread options Peter Neill wrote:
> On Mon, 26 May 2008 03:42:08 -0700 (PDT), the wizard
>
>
>>Hi to all you knowledgable and helpful people,
>>Enough buttering up, is there someone out there with an Eagle surface
>>grinder. I bought one yesterday without handbook or grinding wheel,
>>but at a very advantageous price.
>>The question is, what size wheel is "standard" and for that matter
>>what grit/bonding mix.do I need for good finish on steel, The grinder
>>will not be used in a commercial time constraint situation, so stock
>>removal rates are less important than finish accuracy and appearence.
>>Suggestions as to where I can get a copy/scan/loan of the handbook,
>>anyone?
>>Thanks in advance.
>>T,W
>>,
>
>
> Standard wheel size is 7" x1/2" x1.25" bore (180 x 13 x 31.75mm),
> however if you want to use a thinner wheel, you will need to make a
> new hub clamp disc, as on the Eagles these tend to be specific for the
> width of the wheel - important to check.
> Check the wheel rotation too, (should be anti-clockwise IIRC) as the
> hub clamp is held on with a normal right hand threaded nut.
>
> As for wheel grit types, there is as much debate here as the HSS vs
> Carbide debate. In general, a harder steel needs a softer wheel, and
> vice versa.
Why is this? I'm curious. Is it because lost grit gets embedded in a
softer workpiece and then wears away the grinding wheel?
Best wishes,
Chris
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Posted by Peter Neill on May 26, 2008, 3:31 pm
Please log in for more thread options On Mon, 26 May 2008 20:13:11 +0000, Christopher Tidy
>>
>> As for wheel grit types, there is as much debate here as the HSS vs
>> Carbide debate. In general, a harder steel needs a softer wheel, and
>> vice versa.
>
>Why is this? I'm curious. Is it because lost grit gets embedded in a
>softer workpiece and then wears away the grinding wheel?
>
>Best wishes,
>
>Chris
The hardness refers to the strength of the bond holding the grit
together, rather than the grit itself.
A hard material will dull or blunt the grit, and if it doesn't break
off then the wheel will glaze and not cut, so a softer wheel allows
the grit to break away easier and then effectively presents a sharp
new cutting edge.
Softer materials don't wear the wheel so much, so can use a harder
bond.
Peter
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>Enough buttering up, is there someone out there with an Eagle surface
>grinder. I bought one yesterday without handbook or grinding wheel,
>but at a very advantageous price.
>The question is, what size wheel is "standard" and for that matter
>what grit/bonding mix.do I need for good finish on steel, The grinder
>will not be used in a commercial time constraint situation, so stock
>removal rates are less important than finish accuracy and appearence.
>Suggestions as to where I can get a copy/scan/loan of the handbook,
>anyone?
>Thanks in advance.
>T,W
>,