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Positioning subject with floppy drive head

 
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acerola



Joined: 13 Dec 2006
Posts: 251
Location: Hungary

PostPosted: Fri Jan 25, 2008 9:26 am    Post subject: Positioning subject with floppy drive head Reply with quote

I'm still thinking about positioning subject for stacking. One of my idea is stepping motors. There are a lot of stepping motor available in different equipments. eg.: Printers, drives.

One of my idea is positioning the subject with the head of floppy drive. It's main advantage, that it can easily controlled via computer. It's cheap. It must be accurate. The downside is that the distance between tracks are only 0.19 mm. It is not enough for small subjects.

What is the subject size when it can be usable in practice?
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Péter
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elf



Joined: 18 Nov 2007
Posts: 1345

PostPosted: Sat Jan 26, 2008 1:55 pm    Post subject: Reply with quote

Can you post some pictures of the setup?
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acerola



Joined: 13 Dec 2006
Posts: 251
Location: Hungary

PostPosted: Sat Jan 26, 2008 1:56 pm    Post subject: Reply with quote

I do this setup today. I have to search the internet to position the floppy head, but it turned out to quite easy. There is a direction pin and a stepping pin on the floppy disk interface.
So I put a switch to the stepping pin and whenever I wanted a step I pushed it.

The result is here I'm not quite satisfied with it. It is a day and a half work of researching, assembling, photographing and keeping my 8 month old son out of the way.
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Péter
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acerola



Joined: 13 Dec 2006
Posts: 251
Location: Hungary

PostPosted: Sat Jan 26, 2008 1:59 pm    Post subject: Reply with quote

elf wrote:
Can you post some pictures of the setup?

It is a complete mess. I don't have dedicated working place, I do it on the kitchen table. I take a picture with a compact camera. I did not see it yet.
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Péter
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DaveW



Joined: 04 Aug 2006
Posts: 1702
Location: Nottingham, UK

PostPosted: Sat Jan 26, 2008 2:08 pm    Post subject: Reply with quote

I often wondered if you could reverse the principle of levers to produce small steps on a slider, provided there was not much play in the system. That is couple the short end of the lever on the pivot side to the slide through a linkage and then have some form of adjustment screw acting on the long end of the lever.

Advancing the screw by one turn at the long end of the lever then would only move the slide a minute amount at the short end of the lever. The longer the long end of the lever in proportion to the short end the other side of the pivot, the smaller would be the steps? Just a thought.

DaveW
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acerola



Joined: 13 Dec 2006
Posts: 251
Location: Hungary

PostPosted: Sat Jan 26, 2008 2:22 pm    Post subject: Reply with quote

Yes I thought about it. But I'm not too good in mechanics. And it has a rotation movement in it if you don't use sliders at the end.

I'm thinking on making the same with a CD drive. It must be a better stepping resolution.

So this was the setup. Once again it is a makeshift setup. Embarassed



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Péter
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DaveW



Joined: 04 Aug 2006
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Location: Nottingham, UK

PostPosted: Sat Jan 26, 2008 3:02 pm    Post subject: Reply with quote

Don't like that big "Z" of waggly wire Peter. I would think oscillation would take quite a while to settle after each step movement disturbed it?

DaveW
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acerola



Joined: 13 Dec 2006
Posts: 251
Location: Hungary

PostPosted: Sat Jan 26, 2008 3:09 pm    Post subject: Reply with quote

You are right, but the result was not that bad. All I can rely on is the shortness of the flash light.
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Charles Krebs



Joined: 01 Aug 2006
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PostPosted: Sun Jan 27, 2008 5:55 pm    Post subject: Reply with quote

Péter,

Clever. A lever arrangement, with a long and short arm as Dave mentioned would allow you to set proper movement increments.

Charlie
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acerola



Joined: 13 Dec 2006
Posts: 251
Location: Hungary

PostPosted: Mon Jan 28, 2008 2:26 am    Post subject: Reply with quote

Thanks Charles. I'm still thinking on it. But you gave me another idea.
Using a level mechanism with changeable ratio. (Now I think Dave just mentioned the same) In that way I could set the stepping for each subject.

I will try the CD Drive also. I will ask some spare parts in out IT department to start with.
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Cyclops



Joined: 05 Aug 2006
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Location: North East of England

PostPosted: Wed Mar 12, 2008 3:42 am    Post subject: Reply with quote

Wow i'd never seen this,amazingly inventive
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