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Posted by Adrian Godwin on January 30, 2008, 6:54 pm
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> Adrian Godwin wrote:
>>
>>
>>>wonderful what you can pick up on ebay). One thing I don't have is the
>>>arrangements for mounting and polishing specimens. You might get away
>>>without mounting, but you need to be able to get a good flat polish on
>>>the surface before etching. Normally successively finer water washed
>>>emery papers, then if I remember correctly we used 6micron and then 1
>>>micron diamond paste on a rotating table a bit like a record deck, but
>>
>>
>> I have a metallurgist's "belt sander" - it has a much superior
>> belt-tracking arrangement than the usual hardware-store version,
>> facilities for keeping the sample and belt wet, and a wash sump.
>>
>> It's a bit bulky, though - I'd swap it for a more ordinary linisher
>> as long as it had reasonable belt control.
>
> Thanks for the offer. I don't have a linisher around to swap for it, though.
>
> Just out of interest, what make and model is it? I might look out for a
> similar one.
>
It's a Metaserv C1850A (read off the plate - I have no idea if that's good
or bad!). Here's a picture :
http://www.flickr.com/photos/23312780@N04/2228532703/
I was planning to strip it down and use the mechanism to make something
more suited to my needs, but it seems a shame if someone needs it as-is.
I'm sure we could come to some arrangement if you or Steve want it.
I notice there's also some sort of diamond grinder on ebay - maybe
this would do for finishing ? Needs a bit of work ..
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&rd=1&item=260205896898
-adrian
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Posted by Christopher Tidy on January 29, 2008, 2:34 am
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Cheshire Steve wrote:
<snip>
> I qualified as a metallurgist, but my work has taken me away from that
> now, but I have a hankering to get the capability back, and have
> slowly acquired a small furnace, microscope, and hardness tester (its
> wonderful what you can pick up on ebay). One thing I don't have is the
> arrangements for mounting and polishing specimens. You might get away
> without mounting, but you need to be able to get a good flat polish on
> the surface before etching. Normally successively finer water washed
> emery papers, then if I remember correctly we used 6micron and then 1
> micron diamond paste on a rotating table a bit like a record deck, but
> with more grunt. Steel etching is a fairly quick affair with 5% nitric
> in ethanol (referred to as Nital), or maybe 10%. Different etchants
> could be used for other metals.
Just out of interest, what microscope do you have? I've been looking at
a Watson "Standard Metallurgical".
> The core of metallurgy is understanding how heat treatment changes the
> microstructure of metals and hence modifies the properties, and
> understanding this means understanding the phase diagrams which show
> the solid state transformations, and then understanding how changing
> the cooling rate changes the microstructure. Much of the rest of
> metallurgy overlaps with other disciplines, for example fatigue
> failure, crack growth, overlap with mech eng; corrosion, plating,
> extraction, refining, overlap with chem eng; and ores and minerals
> overlaps with geology. For my money the best book I have seen on this
> 'core' aspect is Metallography of Phase Transformations by Chadwick,
> it really links the phase diagrams to the microstructure. I still have
> my copy as well as my notes from the lectures back in the 1970s - so
> if you want me to look some things up then drop me a line. I may even
> have some microstructure photos, though generally we drew them by hand
> - that way the significant features had to be appreciated by the brain
> cells. It reminds me of the quote that lecturing is the art of
> transferring information from the notes of the lecturer to the notes
> of the student without passing through the minds of either - it is of
> course not true!
Thanks very much for the reference and the offer. Sorry I missed the
reference on Sunday. I read the posts here rather hurriedly.
Best wishes,
Chris
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Posted by Cheshire Steve on January 29, 2008, 5:12 pm
Please log in for more thread options > Cheshire Steve wrote:
>
> <snip>
>
> > I qualified as a metallurgist, but my work has taken me away from that
> > now, but I have a hankering to get the capability back, and have
> > slowly acquired a small furnace, microscope, and hardness tester (its
> > wonderful what you can pick up on ebay). One thing I don't have is the
> > arrangements for mounting and polishing specimens. You might get away
> > without mounting, but you need to be able to get a good flat polish on
> > the surface before etching. Normally successively finer water washed
> > emery papers, then if I remember correctly we used 6micron and then 1
> > micron diamond paste on a rotating table a bit like a record deck, but
> > with more grunt. Steel etching is a fairly quick affair with 5% nitric
> > in ethanol (referred to as Nital), or maybe 10%. Different etchants
> > could be used for other metals.
>
> Just out of interest, what microscope do you have? I've been looking at
> a Watson "Standard Metallurgical".
>
>
>
> > The core of metallurgy is understanding how heat treatment changes the
> > microstructure of metals and hence modifies the properties, and
> > understanding this means understanding the phase diagrams which show
> > the solid state transformations, and then understanding how changing
> > the cooling rate changes the microstructure. Much of the rest of
> > metallurgy overlaps with other disciplines, for example fatigue
> > failure, crack growth, overlap with mech eng; corrosion, plating,
> > extraction, refining, overlap with chem eng; and ores and minerals
> > overlaps with geology. For my money the best book I have seen on this
> > 'core' aspect is Metallography of Phase Transformations by Chadwick,
> > it really links the phase diagrams to the microstructure. I still have
> > my copy as well as my notes from the lectures back in the 1970s - so
> > if you want me to look some things up then drop me a line. I may even
> > have some microstructure photos, though generally we drew them by hand
> > - that way the significant features had to be appreciated by the brain
> > cells. It reminds me of the quote that lecturing is the art of
> > transferring information from the notes of the lecturer to the notes
> > of the student without passing through the minds of either - it is of
> > course not true!
>
> Thanks very much for the reference and the offer. Sorry I missed the
> reference on Sunday. I read the posts here rather hurriedly.
>
> Best wishes,
>
> Chris
Its a Vickers M12a - I don't remember how much I paid for it, but very
happy. However I waited quite a while for a metallurgical one that was
at a good price and within driving range - this was in Liverpool.
The top photomicroscopes I used were Zeiss - but you are talking money
for one of those.
Best Regards
Steve
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Posted by Christopher Tidy on February 2, 2008, 3:52 pm
Please log in for more thread options Cheshire Steve wrote:
<snip>
> Its a Vickers M12a - I don't remember how much I paid for it, but very
> happy. However I waited quite a while for a metallurgical one that was
> at a good price and within driving range - this was in Liverpool.
>
> The top photomicroscopes I used were Zeiss - but you are talking money
> for one of those.
In the end I decided to buy the Watson "Standard Metallurgical"
microscope. It should be with me in a week or so. If I get any great
pictures, I'll post them for everyone to see!
Best wishes,
Chris
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Posted by Christopher Tidy on January 27, 2008, 8:31 am
Please log in for more thread options Cheshire Steve wrote:
<snip>
> You realise you need a metallurgical microscope - i.e. one which
> illuminates from above. The majority of microscopes illuminate from
> below.
>
> You don't say why you want to do this - are you teaching yourself
> metallurgy, or hoping to provide a technical service ? Its an
> interesting area, and a lot of science goes into understanding what
> you see. I can recommend a good book if you are interested.
Yes Steve, I'd be interested in your book recommendation.
I already have "Practical Microscopical Metallography" by Richard
Greaves and Harold Wrighton, if that's the one you're thinking of.
Best wishes,
Chris
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