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Thread: Centring Microscopes
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24th October 2013, 10:03 AM #31
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Well most of my post from late last night it a complete load, so best forget it.
Hi Michael,
Not that easy, at least the first attempt.... I found that out the hard way and it had me scratching my head for a day or so. Moving the mirror from one end like that changes the angle sure, but it also alters the distance of the mirror from the point the spindle and scope centrelines intersect. Which in my case meant that although I was moving the mirror by huge amounts the error stayed pretty much the same lol. Hope the sketch makes sense.
Having sketched that I'm thinking if the mirror was hinged from the other end, that might fix things?(at least for this error)
Such a simple little project
Most of this wouldnt matter as much if the scope didnt slide.
Stuart
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24th October 2013, 11:09 AM #32
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Something quick and rough. I think rotation about the arbor centreline might work via a pair of screws. Height adjustment is another thing. Mirror angle adjustment is something else. TF I have the Isoma.
Marcel.jpgLast edited by Anorak Bob; 24th October 2013 at 07:35 PM. Reason: FF? Thank not fank!
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24th October 2013, 11:41 AM #33
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Hi BT,
Yeah, the notches and two grub screws is what I was getting at with this.
https://www.woodworkforums.com/attach...marcel-200.jpg
Though granted it helps that I know what I was trying to show
Couple of other things, remember if you're going to go to the trouble of getting the 45deg spot on you have to get the 90deg spot on as well(though thats a little easier)
Have you worked out how you're going to make oval mirror?(though a large enough circle would do)
Having a tube for the Marcel is going to cost you Z.
Can you check the 92mm focal length? I measure mine at 72mm. Which is enough to force changes to the design. Not sure if its differences between the scopes or us.
Stuart
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24th October 2013, 12:55 PM #34
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Stu,
Your mention of an oval mirror highlights another oversight on my behalf. The Isoma utilises a rectangular mirror but the Isoma has a short focal length. Marcel's objective lens is 15mm in diameter, far larger than the Isoma's. I need to check for vignetting, I'll take home a circle template.
Whilst perusing Deutsch Ebay early this morning I found this. Maybe an enticement for someone with more Z than I. Zentriermikroskop ISOMA ZP72 Swiss made Top Zustand | eBay BT
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