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Which USB "microscope" for measurement / poor mans shadowgraph?

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Fergus OMore:
Yes, but there is a lot more. I'm guessing  :loco: that there is a bit using an occular which is similar to what is being offered in  Hemingwaykits

However, I suspect that you will want to have Advanced Machine Work by Robert H Smith as an aide memoire. Still on the net- ancient but brilliant.

Regards

Norman

PekkaNF:
I'll check it bit later

I have:
Accurate Tool Work (1908)
http://archive.org/details/accuratetoolwor00stangoog
few pages of microscopes

and

Modern toolmaking methods
http://archive.org/details/moderntoolmakin00jonegoog
that has some inspirational measurement stuff

BUT they still don't convice me to make centering microscope and definately not one, that has great likelihood of working good enough to justify this soujours.

Pekka

srm_92000:
Just to add to my post a little (Did anyone see it?)

Once you have a mark on screen you can just use the mill handles to measure anything. my main use is to measure things that are flexible specifically razor blades, but pitch of screws, thin sections etc. would be easy.
as edge finding or lining up to a punched mark goes it's simple.
I can easily repeat within .025mm and with care .01 or less.
once linear dimensions are taken it's easy to just draw it in a free CAD package to get any angles or other info needed.

 :coffee:

AussieJimG:
I built one like yours Steve, using the innards of a Logitech webcam. As you say, having the sensor on axis is not a big deal. I was worried that it described a cone when the quill was rotated. In retrospect, that probably did not matter either.

But I put it to one side when I realised that the 640x400 pixel resolution of the (free) CentreCam software would not give me the accuracy I wanted - not down to 0.01mm. Perhaps if I had bought the updated software it would have been alright.

Jim

Fergus OMore:
Jim,
        A note here about Centrecam. I registered with Trethewey and have a number but all that registering does( did) was to remove the 'free' thing.  As indicated, Centrecam still has a  long way to go- and I've waited a long time. Moreover, I contacted him about the known problems using a higher level of Windows. I simply gave up. It cost me £20 or so to register and whilst I appreciated the potential, I was wasting my time.
N

Pekka,
That leads me to raise other questions about the viability of your plans. Years and years ago, I was involved in quality control and inspection and whatever. This was with access to a great deal more in measurement equipment than I have now in my small home workshop. OK, I have or had a lot of stuff far beyond the average home workshop but  I am going to question whether you have the backup equipment to go beyond what Geometer( Westbury?) possessed- and was able to construct from it.

Having said that, there are a lot of places which I visit where 'my finished work' is still in place( it's lasted well) but I would be the first to realise that it could not have been done with what I have -in my own workshop now- even with computers and whatever instead of a 'guessing stick'

I hope that I haven't upset you.

Norman

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