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Posted by on June 16, 2006, 7:50 am
I figured I could use floppy arms for precision positioning. By useing
the same mechanical drive as the one positioning the magnetic head in a floppy:
http://www.ohs.rcs.k12.tn.us/Technology/Floppy%20Drive.jpg (178kB)
---------
| Motor | ==============[Head]======
--------- ^
|
This "screw"
So where does one get/buy "screws" like this ..?
Preferebly slightly longer. like 200mm ;)
Posted by Fulliautomatix on June 16, 2006, 8:19 am
> I figured I could use floppy arms for precision positioning. By useing > the same mechanical drive as the one positioning the magnetic head in a floppy: > http://www.ohs.rcs.k12.tn.us/Technology/Floppy%20Drive.jpg (178kB) > > --------- > | Motor | ==============[Head]====== > --------- ^ > | > This "screw" > > So where does one get/buy "screws" like this ..? > Preferebly slightly longer. like 200mm ;) >
Dunno...I have used a piece of threaded rod and a stepper motor for
positioning
Same idea
Posted by on June 16, 2006, 11:09 am
>> So where does one get/buy "screws" like this ..? >> Preferebly slightly longer. like 200mm ;) >>
>Dunno...I have used a piece of threaded rod and a stepper motor for >positioning
>Same idea
I have thought of that too. But I guess speed will suffer. Maybe it also is
more prone to jameing ..?
Posted by ian dobson on June 16, 2006, 11:15 am
Hi,
Have a look at old inkjet printers. I salvaged a 30cm long thread (it
actually has 6 threads that run parallel to each other) from a old cannon
BJ.
Regards
Ian Dobson
Home of the Atmel based UDP mobile web cam http://www.planet-ian.com All mails scanned with av-filter.pl (F-Prot / perl)
>I figured I could use floppy arms for precision positioning. By useing > the same mechanical drive as the one positioning the magnetic head in a > floppy: > http://www.ohs.rcs.k12.tn.us/Technology/Floppy%20Drive.jpg (178kB) > --------- > | Motor | ==============[Head]====== > --------- ^ > | > This "screw" > So where does one get/buy "screws" like this ..? > Preferebly slightly longer. like 200mm ;) >
Posted by on June 16, 2006, 2:55 pm
>Have a look at old inkjet printers. I salvaged a 30cm long thread (it >actually has 6 threads that run parallel to each other) from a old cannon BJ.
Could you post any picture ..? (curious)
Any other parts you found useful?
I looked inside a still working hp5550-usb, it uses tractordrive with some
plasticfilm/opto feedback loop to control sideways motion.
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> the same mechanical drive as the one positioning the magnetic head in a floppy:
> http://www.ohs.rcs.k12.tn.us/Technology/Floppy%20Drive.jpg (178kB)
>
> ---------
> | Motor | ==============[Head]======
> --------- ^
> |
> This "screw"
>
> So where does one get/buy "screws" like this ..?
> Preferebly slightly longer. like 200mm ;)
>