Question about Fisher Micromaster I Binocular Microscope

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Loose mechanical stage

Hello, the stage on my Micromaster I compound microscope is loose. By simply touching, not turning the X or Y stage adjustments, I can cause the whole stage to shift along the y axis slightly. Is there something that can be tightened to prevent this?

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SOURCE: The mechanical stage adjustment on my fisher

The gear that runs along the stage is probably loose. It is held in place by three screws. If the gear is nots parrallel with the X/Y axis gear it will bind. My guess would be that it is the two outer ones that are loose, thereby creating a see-saw affect.

Posted on Dec 30, 2010


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Can I readily remove the stage from a Micromaster I, in order to examine a larger object (eg.violin) ? And then reinstall it without damage? Thanks Sam

Yes you can. Probably the best way is to remove the whole focusing assembly, otherwise once you remove the stage, you will have the sub-stage (where the condenser is) in your way. To remove the entire focusing assembly, you will first need to remove the sub-stage. On the left hand side of the sub-stage arm you will see a tiny set screw. It should be a flat head one, and you don't need to remove it all the way, but you have to back it of a ways. Once the screw is backed off far enough, the sub-stage can be lower down to a point at which it will come off. That will expose 4 hex screws; remove those 4 screws and the entire focus assembly will come off.

That should give you enough room for a violin to fit under it, but you are still going to have issues with focusing in on it. With the focusing assembly gone, there is no way to easily adjust your focus. You will literally need to act as the focusing assembly by lifting it up, or pursing it further way. You will also run into an issue with light... there isn't going to be any, but you can use an external light source from above, like a desk lamp or better yet a flash light; something that has a focused light would be best. Ideally this would be a fiber optic light source.

If you haven't already bought a microscope yet though, I would strongly consider getting the right type of microscope for this, which is a stereo for magnification of 100x or below, or you could do it will a transmitted inverted metallurgical microscope for magnifications above 100x. Where you might be able to get the micromaster to work, it really isn't the most ideal candidate for this type of application.

Feb 02, 2011 | Fisher Micromaster I Binocular Microscope

1 Answer

The mechanical stage adjustment on my fisher scientific micromaster does not go (either to the left or right) as far as it previously did. I am no longer able to read the entire field of a rafter cell...

The gear that runs along the stage is probably loose. It is held in place by three screws. If the gear is nots parrallel with the X/Y axis gear it will bind. My guess would be that it is the two outer ones that are loose, thereby creating a see-saw affect.

Dec 29, 2010 | Fisher Micromaster I Binocular Microscope

1 Answer

What is the function and the purpose of the parts of the microscope ?

Starting at the bottom of the Compound Microscope scope working up: The base of the scope houses the illumination system and the field lens. It also provides weighted stablility.
The field lens is where the light comes out of the base. This lens focuses the light from the bulb directly into the substage condenser.
The arm of the scope supports the rest of the scope.
Directly above the field condenser is the substage condenser. The substage condenser collects the light and condenses it further into a more concentrated beam of light. With the substage condenser you can control the amount of light and to some degree the defraction of light. This is helpful in adjusting the "contrast" in the image.
Working up, you find the "stage" which is a platform to support the specimen. The stage may or may not have a specimen holder and a set of specimen holder control knobs.
The magnifying lenses are called the objectives. They look like barrels pointing down at the stage. These are usually marked 4x, 10x, 40x, and 100x. These magnifications are further multiplied by the power of the eyepieces which are usually 10x. So, when using the 4x you are actually seeing the specimen at 40x and when you are using the 10x objective you are actually seeing the specimen at 100x and so on. The 4x is used to "scan" the specimen so that you can find the most interesting area and then focus in further on that region. It is very hard to find exactly what you want to focus in on starting with the higher magnifications. Always start with the low magnifications, 4x or 10x.
The objective lenses are mounted on a rotating turret for easy selection.
Moving on up the scope is the head. It is comprised of the eye tube and the eyepiece. If you have two eyepieces your scope is referred to as a "Binocular Compound Microscope". If you have only one eyepiece, your scope is a "Monocular Compound Microscope".

Sep 27, 2010 | C And A Scientific IExplore Scope

1 Answer

My premiere microscope MS-01 Ultra will not focus

There is what is called a "stage stop" screw. Its purpose is to limit the specimen from rising high enough to contact the objective lens. The "stage stop" screw is directly behind the black stage platform in plain sight and very easy to access. It is a thumb screw and sits vertically. Simply loosen it a bit to allow the specimen to rise high enough to focus.

Jul 25, 2010 | Premiere Microscopes MRJ-03 Microscope

1 Answer

My stage is no longer moving with the knobs.

With one hand push the stage down, and with the other turn the coarse adjustment down. It's a cog alignment issue. The coarse adjustment cog should be turning in order to catch the stage track.

Feb 19, 2010 | Celestron 44320 Trinocular Microscope

2 Answers

My microscope drfits out of focus, how can I fix this?

The problem is that the stage is heavy and the adjustment screws are loose. You need to tighten the coarse adjustment knob screws in order to create more friction so that the stage stays put. That, or don't adjust anything and keep holding on to the coarse adjustment while you're using it.

Nov 19, 2009 | Boreal WW3111900 Microscope

1 Answer

Stage slowly falls causing unfocus

Try holding the Right knob so it does not move, whilst firmly moving the Left knob towards you (clockwise), this is the adjusting method used on Zeiss Jena 1960's High End microscopes, e.g Eduaval & Ergaval.
Good luck,
Alan Mowle

Mar 05, 2009 | Science & Laboratory

1 Answer

Problem with MF-02 binocular microscope stage

I think your problem lies in the way the stage is limited upwards. On top of the stage, right behind it where it slides against the arm, there should be a little screw.  This screw limits the movement of the stage to a certain point upwards.  If the limit exceeds the adjustment gear and its opposing track, then the stage just goes up one notch and then it clunks down.  If you screw it down the stage is limited further down, if you screw it up it's limited a bit higher.  The point of this screw is to prevent objective and slide damage.  Try adjusting this little screw a bit further down and see if it still 'clunks' when you turn it up.  After that we may work on properly adjusting it.  If not, please post again with whatever detail you can provide to aid you with this problem further.

May 28, 2008 | Premiere Microscopes MF-02 Binocular...

2 Answers

Focuser broken

Not really a solution, but anything is better than a posting that get's NO response. It sounds like the rack and pinion drive has collapsed. If you're good with your hands and have a knack for things mechanical maybe you can dissassemble the stage mounting and see how it's meant to work. If something has come loose rather than broken maybe you can fix it. If teeth have stripped from the drive gear - you may be unable to effect a repair. I guess trying to fix it is better than doing nothing. Have a good 2008


Jan 05, 2008 | Meade 8200 Monocular Microscope

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