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Microscope stand as subject elevator (Z axys)

 
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Yawns



Joined: 20 Dec 2015
Posts: 139
Location: Portugal

PostPosted: Fri Aug 10, 2018 2:24 am    Post subject: Microscope stand as subject elevator (Z axys) Reply with quote

Good morning... I have no experience on this.


Do you think I can make a suitable "elevator" cuting one of those?

Lomo

https://www.ebay.com/itm/Microscope-LOMO-with-Case/292654304937?_trksid=p2485497.m4902.l9144


Olympus K
https://www.ebay.com/itm/Microscope-Olympus-Model-K-A-level-A1-Condition-Original-Case/292654305763?_trksid=p2485497.m4902.l9144
[/img]
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Pau
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Joined: 20 Jan 2010
Posts: 4381
Location: Valencia, Spain

PostPosted: Fri Aug 10, 2018 3:25 am    Post subject: Reply with quote

If your project is to cut the arm to use the stage as "elevator" the Lomo wont be adequate as it moves the arm to focus, not the stage.
The Olympus would do for positioning, but if you plan to use it as stacking device be aware that the fine focus maybe has a very short travel, so not adequate for most macro work, I'm not sure (If it moves all the coarse focus travel it would be).
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Yawns



Joined: 20 Dec 2015
Posts: 139
Location: Portugal

PostPosted: Fri Aug 10, 2018 4:06 am    Post subject: Reply with quote

Thank Pau, you for your reply...
I'm so sick tired to buy this and that online, only to find out things won't work when I get the real thing ...

My current system looks like this ... I could manage so far with the labjack but that labjack is a nightmare when I go up to 10x .. it's the second .. after a "ebay -china" one I bought an epensive one "Rexaloy", and it's the same thing .. before the screw engages well I see a diagonal travel of the insect.
The cheap macro rail for x,y works pretty good



as I am going to change the base of my system, and make a lower profile I would like t resolve the insect side for good...



I was also thinking to get another chep macro rail and make something like this



this kind of things don't look to be a solution as the travel is very small, like 5-6 mm on every axys ...



I don't know what to do honestly ...

António[/img]
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enricosavazzi



Joined: 21 Nov 2009
Posts: 1024
Location: Stockholm, Sweden

PostPosted: Fri Aug 10, 2018 5:07 am    Post subject: Reply with quote

Actually, the general type of three-axis micrometer you show in the last picture is quite adequate for positioning a subject in 3D space. Whether this specific model will do is a different question. If this specific model has too short a travel, there are bigger models with 10 mm, 25 mm or sometimes 50 mm travel. You can however use e.g. a largish aluminium or iron parallelepiped-shaped block to raise the micrometer to the approximate needed height, and slide it manually along the top of the block for a coarse position adjustment if the travel of the micrometers is not enough.

These 3-axis micrometers are typically spring-loaded, so the backlash is minimal. Unless you work at high magnification, a precision of 50 to 100 microns in the positioning of the subject (we are not talking about the precision of the z-distance between shots in a stack) is usually adequate. Virtually all 3D micrometers of this type, including cheap ones made in China, will give you at a minimum this level of precision.

Inclination about three axes can be obtained with a rotating micrometer (rather cheap) plus two tilt micrometers (usually expensive). A stack of three linear micrometers, one rotation micrometer and two tilt micrometers can be roughly 15-20 cm high, so don't place the camera attachment of your setup too low.

In general you will begin to position a subject by adjusting the inclination of the subject, and subsequently its position along x, y, z. It will be a lot easier to operate if the tilt micrometers are at the top of the micrometer stack, and the rotation micrometer between the tilt and linear micrometers.
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mawyatt



Joined: 22 Aug 2013
Posts: 1513
Location: Clearwater

PostPosted: Fri Aug 10, 2018 5:19 am    Post subject: Reply with quote

Yawns,

This SELN LGY40-R stage I got from Wemacro a quite a few years back (just ordered 2 more) have almost 15mm travel. Nice and smooth operation and have standard 1/4-20 mounts.

Best,

Edit: Just saw ES post and agree. If you use the setup as shown the vertical can be coarse positioned with the ARCA clamp and easily removed to use on another setup if desired.

BTW if you mount a small ball head on the stage as shown then you have lots of flexibility for subject positioning, I use this method often and it doesn't cost as much as the tilt option ES mentioned...but not as precise either.





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Alan Wood



Joined: 29 Dec 2010
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Location: Near London, U.K.

PostPosted: Fri Aug 10, 2018 7:19 am    Post subject: Reply with quote

Fine focus range on the Olympus K is only 2 mm.

On later models (BH, CH, BH-2 and CH-2), the fine focus operates over the same range as the course focus.

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zzffnn



Joined: 22 May 2014
Posts: 1676
Location: Texas USA

PostPosted: Fri Aug 10, 2018 1:46 pm    Post subject: Reply with quote

Fine focus travel of my LOMO microscope is indeed VERY short and not graduated. So not good for macro stacking. LOMO did offer better fine focus in their larger microscopes, but those may not be an cost effective solution. Isn't Olympus CH 's focus drive considered as a good budget solution?
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ChrisR
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Joined: 14 Mar 2009
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PostPosted: Fri Aug 10, 2018 5:12 pm    Post subject: Reply with quote

Yes Oly CH is 200µm/360º, travel about 30mm.
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