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?
Positioning subject with floppy drive head
Moderators: rjlittlefield, ChrisR, Chris S., Pau
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.
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.
Péter
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
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
- Charles Krebs
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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.
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.
Péter