Re: StereoZoom microscope repair
- From: "Stackclimber" <stackclimber@xxxxxxx>
- Date: Wed, 4 May 2005 20:15:15 -0500
You might try this: Have you turned the microscopes around or positioned
yourself so that your left eye is peering into the right optical track?
Maybe its your eyesight (hopefully not). Good luck.
J
"Chuck Olson" <chuckolson01@xxxxxxxxxxxxxxxxxxxxx> wrote in message
news:f76dnSbHJKju4evfRVn-tg@xxxxxxxxxxxxxx
>I know, I know, send it back to the factory or to a repair center. But that
> costs money, and I don't learn anything if I do that.
>
> I have a couple of 0.7 to 3.0 Bausch & Lomb microscope pods that are
> messed
> up - - one white one that requires eye convergence for less than a foot
> away
> to superimpose the images, and a black one I just bought that is okay
> horizontally but has a vertical offset. They don't look like they were
> dropped or anything, but the left eye optical path seems different from
> the
> right eye path. It may be my imagination, but the right side of each
> instrument looks good.
>
> I think just about any technician or engineer who needs to work with
> today's
> surface-mount technology needs a good zoom microscope, so there must be a
> lot of them around. I paid $15 for the black one today, complete with
> stand.
> Okay, I should be able to afford some repair expense to put this thing
> back
> in shape, but what's it going to go for after it's fixed - - $100? Can I
> get
> it repaired for $85? I don't think so. And I Google-searched all over for
> some hints as to how to adjust or repair this brand of microscope, but
> there's not a single post that I could find that was any help. I guess all
> the repair techs have signed a non-disclosure agreement or something.
>
> Getting down to business, I opened up my black $15 microscope and found a
> series of mirrors in the section that allows interpupillary adjustment,
> and
> two movable lenses on each side in the zoom section. The mirrors all
> appear
> to be positioned by contact with machined surfaces on pivoting aluminum
> castings. It doesn't look like these can move around unless one breaks
> loose
> from the glyp they put around the edges of the contact areas. Looking into
> the empty eyepiece holes, the left eye sees a bright elongated spot (8 to
> 10% of aperture area) outside the aperture at about 10:00 at all zoom
> settings that is not present in the right eyepiece hole - - looks like a
> sneak path or a chip out of a mirror. The image offset of the left when
> eyepieces are in place is about 1/6 of a field diameter low compared to
> the
> right, and could be converged with eyesight set for 6 ft away, if the
> vertical offset were not present. This offset is exactly the same at all
> magnifications. The white microscope behaves exactly the same at all
> magnifications, also.
>
> In the zoom section, turning the zoom control rotates a pair of cam shafts
> grooved for pins that drive Nylon pads along guides. Each lens is fastened
> to its Nylon pad by a couple of screws, and it appears possible to adjust
> lens tilt by loosening the screws a bit. I have resisted the temptation to
> see what happens when the screws are loosened, but is this the only
> adjustment for optical convergence we have? It looks pretty sloppy and
> difficult to control.
>
> So have any of you dug into your microscope and figured out how to fix it?
> Do any of you with B&L training care to guide an old EE to make something
> good out of the junk he finds at a flea market?
>
> Thanks for all your help,
>
> Chuck,
>
>
.
- References:
- StereoZoom microscope repair
- From: Chuck Olson
- StereoZoom microscope repair
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