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Posted by Steve on September 18, 2006, 4:44 am
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> On 17 Sep 2006 03:27:05 -0700, jontom_1uk@hotmail.com wrote:
>
>>Having eventually sorted out which mill to buy I'm now short of
>>something to "collect", my thoughts have turned to a small Surface
>>Grinder (Eagle?), but do I need one? Do those of you lucky enough to
>>own one use it very often or is it an ornament in the corner? Would I
>>be better getting a Tool and Cutter grinder first as I still haven't
>>built one. As always any advice would be most appreciated.
>>
>>Best regards
>>
>>Keith
>
> I have a small grinder, Dronsfield Eagle Mk2, and find it very useful.
> It doesn't take up much space (single garage shared with the wifes
> laundry) and i've used it quite a lot since I had it.
>
> I re-ground the saddle on my ML7, together with the gib strips and
> saddle strips, resurfaced the boring table then the base of the
> dovetails before scraping them back in, ground flats on hard ejector
> pins for a fixture I made,and have quite a few other little jobs lined
> up for it.
> When I get one of the Stevenson ER spin indexers I intend to use it to
> do a little bit of basic cylindrical grinding on it too.
>
> I have a 0.040" elastic wheel that can be used to quickly cut-off
> hardened stock once I turn up some new thicker wheel spacers to clamp
> it on the arbor. It's a very useful workshop toy really<g>
>
> The only downside is that I have no dust extraction and I have to
> cover everything else in the workshop before I use it, and be careful
> about cleaning up the dust afterwards.
>
> I do like a ground finish on a job, but that's because I've got so
> used to it on just about every surface of the mould tools I've been
> involved with for the last 30 years.
>
> My grinder was old when Gods Dog was a puppy and has a little bit of
> concave wear in the middle, so I can only get as flat as half a thou'
> or so on longer items, but thats usually more than good enough for
> what I need.
>
> Peter
I treated myself to a Beacon Superior a couple of years ago. (Eagle/Capco
size) I also got a DCE Autodrytex dust extractor because I didn't fancy me
or my tackle eating dust. I don't regret it at all and the finish is very
satisfying. I looked at the crank webs for my Dad's Clayton for example
and thought 'did we make those'.
On the cutter grinder front, he has a TCG so I can nip down to use it.
Steve
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Posted by on September 18, 2006, 9:24 am
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Steve wrote:
> > On 17 Sep 2006 03:27:05 -0700, jontom_1uk@hotmail.com wrote:
> >
> >>Having eventually sorted out which mill to buy I'm now short of
> >>something to "collect", my thoughts have turned to a small Surface
> >>Grinder (Eagle?), but do I need one? Do those of you lucky enough to
> >>own one use it very often or is it an ornament in the corner? Would I
> >>be better getting a Tool and Cutter grinder first as I still haven't
> >>built one. As always any advice would be most appreciated.
> >>
> >>Best regards
> >>
> >>Keith
> >
> > I have a small grinder, Dronsfield Eagle Mk2, and find it very useful.
> > It doesn't take up much space (single garage shared with the wifes
> > laundry) and i've used it quite a lot since I had it.
> >
> > I re-ground the saddle on my ML7, together with the gib strips and
> > saddle strips, resurfaced the boring table then the base of the
> > dovetails before scraping them back in, ground flats on hard ejector
> > pins for a fixture I made,and have quite a few other little jobs lined
> > up for it.
> > When I get one of the Stevenson ER spin indexers I intend to use it to
> > do a little bit of basic cylindrical grinding on it too.
> >
> > I have a 0.040" elastic wheel that can be used to quickly cut-off
> > hardened stock once I turn up some new thicker wheel spacers to clamp
> > it on the arbor. It's a very useful workshop toy really<g>
> >
> > The only downside is that I have no dust extraction and I have to
> > cover everything else in the workshop before I use it, and be careful
> > about cleaning up the dust afterwards.
> >
> > I do like a ground finish on a job, but that's because I've got so
> > used to it on just about every surface of the mould tools I've been
> > involved with for the last 30 years.
> >
> > My grinder was old when Gods Dog was a puppy and has a little bit of
> > concave wear in the middle, so I can only get as flat as half a thou'
> > or so on longer items, but thats usually more than good enough for
> > what I need.
> >
> > Peter
>
> I treated myself to a Beacon Superior a couple of years ago. (Eagle/Capco
> size) I also got a DCE Autodrytex dust extractor because I didn't fancy me
> or my tackle eating dust. I don't regret it at all and the finish is very
> satisfying. I looked at the crank webs for my Dad's Clayton for example
> and thought 'did we make those'.
> On the cutter grinder front, he has a TCG so I can nip down to use it.
>
> Steve
Thanks guys, as always a good spread of opinion to inspire a bit of
thought. Certainly appears to fit in the "nice to have" bracket. As
usual I hadn't considered the mess it might produce and am concerned
that my little Westfield might not be improved by being covered in
grinding dust. Still if Peter can keep it off the wife's washing I
suppose I can keep it off a car. As Steve says I'll need to look into a
dust extractor.
Funny how I was paranoid about wear in a secondhand milling machine but
hadn't given it a thought for a grinder. Would Peter N's experience of
"half a thou" wear be typical or should I look out for much worse?
As Peter F says I have an inkling that this might join the pile of "I
will use it - sometime" machines but I do like a good finish. Will a
single phase grinder produce a decent finish? My only experience at
evening classes some years ago was on three phase machines and one of
those was distinctly worse than the others when it came to quality of
finish.
Some interesting points re the T&CG, I think I would take the pay a
professional sugesstion that Nick made if I was located somewhere near
a suitable company. Sharpening drills/endmills etc is not a science
that particularly interests me but to be able to do it must be
pleasing. A little more cogitation required I think.
Thanks again to all
Best regards
Keith
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Posted by Andrew Mawson on September 18, 2006, 9:38 am
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>>SNIP<<
> > Steve
>
>
> Thanks guys, as always a good spread of opinion to inspire a bit of
> thought. Certainly appears to fit in the "nice to have" bracket. As
> usual I hadn't considered the mess it might produce and am concerned
> that my little Westfield might not be improved by being covered in
> grinding dust. Still if Peter can keep it off the wife's washing I
> suppose I can keep it off a car. As Steve says I'll need to look
into a
> dust extractor.
>
> Funny how I was paranoid about wear in a secondhand milling machine
but
> hadn't given it a thought for a grinder. Would Peter N's experience
of
> "half a thou" wear be typical or should I look out for much worse?
>
> As Peter F says I have an inkling that this might join the pile of
"I
> will use it - sometime" machines but I do like a good finish. Will a
> single phase grinder produce a decent finish? My only experience at
> evening classes some years ago was on three phase machines and one
of
> those was distinctly worse than the others when it came to quality
of
> finish.
>
> Some interesting points re the T&CG, I think I would take the pay a
> professional sugesstion that Nick made if I was located somewhere
near
> a suitable company. Sharpening drills/endmills etc is not a science
> that particularly interests me but to be able to do it must be
> pleasing. A little more cogitation required I think.
>
> Thanks again to all
>
> Best regards
>
> Keith
>
Finish is down to choosing the right wheel, balancing it properly,
ensuring that the motor and pullies are balanced so as not to
introduce vibration, and that the wheel spindle bearings are correctly
adjusted. All these factors make a vast difference to surface finish.
A lot of surface grinders have plain bearings for the main spindle,
and these need to come up to temperature if working to fine
tolerances - leave the machine running and reciprocating 'in air' for
an hour or so before use.
Personally I am only happy surface grinding when using coolant - it
keeps the nasty dust well under control and keeps the work at an even
temperature. Although I do have a dust extractor plumbed to my J&S 540
I try at all costs to avoid dry grinding.
AWEM
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Posted by =?ISO-8859-1?Q?Nick_M=FCller?= on September 18, 2006, 11:43 am
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> Sharpening drills/endmills etc is not a science
> that particularly interests me but to be able to do it must be
> pleasing.
That is an argument to buy _any_ tool. Do not adopt to that thinking, it
will ruin you! :-))
Nick
--
The modular DRO
<http://www.yadro.de>
Engine models
<http://www.motor-manufaktur.de>
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Posted by willowkevin on September 18, 2006, 1:55 pm
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i'd like to ask a question ! ive recently seen a boxford t n c grinder ,
it came with a wheel extension and magnetic base so it could also be
used for surface grinding ! are these any good ? ive sharpened a few
cutters back in my apprentice days , but am wondering how good the
machine would be for surface grinding ? (apart from size limitations !)
--
willowkevin
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