small angle/rotary encoder ?

S

Stef Mientki

Guest
I'm looking for a small angle (or rotary) encoder,
I would like to have the following specs:

- (absoluut) angle over minimal 300 degrees
- diameter < 20 mm
- thickness < 10 mm
- accuracy +/- 2 degrees
- small quantities (10 .. 100)

Any ideas ?

Stef Mientki
 
The smallest absolute encoder I can find is 32mm X 32mm, 9 bit, gray Scale /
natural binary. Too big? Jay


--
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"Stef Mientki" <s.mientki@mailbox.kun.nl> wrote in message
news:bmhest$53$1@odysseus.uci.kun.nl...
I'm looking for a small angle (or rotary) encoder,
I would like to have the following specs:

- (absoluut) angle over minimal 300 degrees
- diameter < 20 mm
- thickness < 10 mm
- accuracy +/- 2 degrees
- small quantities (10 .. 100)

Any ideas ?

Stef Mientki
Click to expand...
 
http://www.photocraftencoders.com/SR12.htm


Jay

--
..
----------------------------------------------------------------------------
"I'm pullin' for you; we're all in this together", Red Green
----------------------------------------------------------------------------
..
..
"Stef Mientki" <s.mientki@mailbox.kun.nl> wrote in message
news:bmhm2p$291$1@odysseus.uci.kun.nl...
happyhobit wrote:

The smallest absolute encoder I can find is 32mm X 32mm,
well I could live with that,
can you give me the type ?
thanks,
Stef
9 bit, gray Scale /
natural binary. Too big? Jay
Click to expand...
 
"Stef Mientki" <s.mientki@mailbox.kun.nl> schreef in bericht
news:bmhest$53$1@odysseus.uci.kun.nl...
I'm looking for a small angle (or rotary) encoder,
I would like to have the following specs:

- (absoluut) angle over minimal 300 degrees
- diameter < 20 mm
- thickness < 10 mm
- accuracy +/- 2 degrees
- small quantities (10 .. 100)

Any ideas ?
Click to expand...
With that accuracy you can use a potentiometer. Vishay has some.
Don't look under potentiometers, but at this location:

http://www.vishay.com/resistors-variable/motion-transducers/

Maybe model 140-3-???? (continous rotation) is useable.
Lifetime 500000 revolutions, not too impressive.

There are others, but your space is really tight.

--
Thanks,
Frank Bemelman
(remove 'x' & .invalid when sending email)
 
On Tue, 14 Oct 2003 20:22:23 +0200, Stef Mientki
<s.mientki@mailbox.kun.nl> wrote:

I'm looking for a small angle (or rotary) encoder,
I would like to have the following specs:

- (absoluut) angle over minimal 300 degrees
- diameter < 20 mm
- thickness < 10 mm
- accuracy +/- 2 degrees
- small quantities (10 .. 100)

Any ideas ?
Click to expand...
Absolute might be tough. US Digital has some relative encoders
that are only about 11.4 mm thick and 21 mm diameter.
http://www.usdigital.com/products/e4/

--
Rich Webb Norfolk, VA
 
"Rich Webb" <bbew.ar@mapson.nozirev.ten> wrote in message
news:a72povsj338j2nakj8gfve0vbemt1cnsap@4ax.com...


Absolute might be tough. US Digital has some relative encoders
Click to expand...
Relative? Sorry but it's Absolute or Incremental.

Jay
 
If you are only looking for one or two of these, take apart a cheap mouse
and use the opto encoders. Two encoder wheels, and a matched pair of
emitters/receivers.


"Frank Bemelman" <bemelmanx@euronet.nl.invalid> wrote in message
news:3f8c6263$0$2722$1b62eedf@news.euronet.nl...
"Stef Mientki" <s.mientki@mailbox.kun.nl> schreef in bericht
news:bmhest$53$1@odysseus.uci.kun.nl...
I'm looking for a small angle (or rotary) encoder,
I would like to have the following specs:

- (absoluut) angle over minimal 300 degrees
- diameter < 20 mm
- thickness < 10 mm
- accuracy +/- 2 degrees
- small quantities (10 .. 100)

Any ideas ?

With that accuracy you can use a potentiometer. Vishay has some.
Don't look under potentiometers, but at this location:

http://www.vishay.com/resistors-variable/motion-transducers/

Maybe model 140-3-???? (continous rotation) is useable.
Lifetime 500000 revolutions, not too impressive.

There are others, but your space is really tight.

--
Thanks,
Frank Bemelman
(remove 'x' & .invalid when sending email)
Click to expand...
 
Rich Webb wrote:

On Tue, 14 Oct 2003 20:22:23 +0200, Stef Mientki
s.mientki@mailbox.kun.nl> wrote:


I'm looking for a small angle (or rotary) encoder,
I would like to have the following specs:

- (absoluut) angle over minimal 300 degrees
- diameter < 20 mm
- thickness < 10 mm
- accuracy +/- 2 degrees
- small quantities (10 .. 100)

Any ideas ?


Absolute might be tough. US Digital has some relative encoders
that are only about 11.4 mm thick and 21 mm diameter.
http://www.usdigital.com/products/e4/
Click to expand...
Thanks, that's indeed almost within my limits.
Stef


>
 
Travis Hayes wrote:

If you are only looking for one or two of these, take apart a cheap mouse
and use the opto encoders. Two encoder wheels, and a matched pair of
emitters/receivers.
That might be a very good idea.
Click to expand...
Or maybe the current optical mouses (800 dpi !) ?
But I need 10 ..100 devices ;-(
Stef
"Frank Bemelman" <bemelmanx@euronet.nl.invalid> wrote in message
news:3f8c6263$0$2722$1b62eedf@news.euronet.nl...

"Stef Mientki" <s.mientki@mailbox.kun.nl> schreef in bericht
news:bmhest$53$1@odysseus.uci.kun.nl...

I'm looking for a small angle (or rotary) encoder,
I would like to have the following specs:

- (absoluut) angle over minimal 300 degrees
- diameter < 20 mm
- thickness < 10 mm
- accuracy +/- 2 degrees
- small quantities (10 .. 100)

Any ideas ?

With that accuracy you can use a potentiometer. Vishay has some.
Don't look under potentiometers, but at this location:

http://www.vishay.com/resistors-variable/motion-transducers/

Maybe model 140-3-???? (continous rotation) is useable.
Lifetime 500000 revolutions, not too impressive.

There are others, but your space is really tight.

--
Thanks,
Frank Bemelman
(remove 'x' & .invalid when sending email)
Click to expand...
 
Are you looking for an absoluut (absolute) or incremental encoder?

For what application?

If all you're looking for is a digital panel encoder than Grayhill,
Panasonic, Tasoku, CTS, Clarostat and Bourns all make products that would do
what you want.

What do you want?

Jay



"Stef Mientki" <s.mientki@mailbox.kun.nl> wrote in message
news:bmita3$cmm$1@odysseus.uci.kun.nl...
Rich Webb wrote:

On Tue, 14 Oct 2003 20:22:23 +0200, Stef Mientki
s.mientki@mailbox.kun.nl> wrote:


I'm looking for a small angle (or rotary) encoder,
I would like to have the following specs:

- (absoluut) angle over minimal 300 degrees
- diameter < 20 mm
- thickness < 10 mm
- accuracy +/- 2 degrees
- small quantities (10 .. 100)

Any ideas ?


Absolute might be tough. US Digital has some relative encoders
that are only about 11.4 mm thick and 21 mm diameter.
http://www.usdigital.com/products/e4/

Thanks, that's indeed almost within my limits.
Stef
Click to expand...
 
happyhobit wrote:

Are you looking for an absoluut (absolute) or incremental encoder?
the best would an "absolute", but I can live with incremental.

For what application?
Goniometer, for measuring the angle of human joints, like the finger.
Click to expand...
The totalsize of this thing should be in the order of a pocket knife.
If all you're looking for is a digital panel encoder than Grayhill,
Panasonic, Tasoku, CTS, Clarostat and Bourns all make products that would do
what you want.
Most of them are potmeters, which have far too much height.

What do you want?
Well the E4 of US digital looks quiet suitable,
Click to expand...
a little bit smaller would even be nicer ;-)

Stef
Jay



"Stef Mientki" <s.mientki@mailbox.kun.nl> wrote in message
news:bmita3$cmm$1@odysseus.uci.kun.nl...


Rich Webb wrote:


On Tue, 14 Oct 2003 20:22:23 +0200, Stef Mientki
s.mientki@mailbox.kun.nl> wrote:



I'm looking for a small angle (or rotary) encoder,
I would like to have the following specs:

- (absoluut) angle over minimal 300 degrees
- diameter < 20 mm
- thickness < 10 mm
- accuracy +/- 2 degrees
- small quantities (10 .. 100)

Any ideas ?


Absolute might be tough. US Digital has some relative encoders
that are only about 11.4 mm thick and 21 mm diameter.
http://www.usdigital.com/products/e4/

Thanks, that's indeed almost within my limits.
Stef
Click to expand...
 
Stef Mientki wrote:
For what application?
Goniometer, for measuring the angle of human joints, like the finger.
The totalsize of this thing should be in the order of a pocket knife.
Click to expand...
Just thought I'd check to see if you knew about other methods of doing this
which are potentially very small - fiber optics and flex sensors.

Mitch Berkson
 
Frank Bemelman wrote:

"Stef Mientki" <s.mientki@mailbox.kun.nl> schreef in bericht
news:bmhest$53$1@odysseus.uci.kun.nl...

I'm looking for a small angle (or rotary) encoder,
I would like to have the following specs:

- (absoluut) angle over minimal 300 degrees
- diameter < 20 mm
- thickness < 10 mm
- accuracy +/- 2 degrees
- small quantities (10 .. 100)

Any ideas ?


With that accuracy you can use a potentiometer. Vishay has some.
Don't look under potentiometers, but at this location:

http://www.vishay.com/resistors-variable/motion-transducers/

Maybe model 140-3-???? (continous rotation) is useable.
Lifetime 500000 revolutions, not too impressive.

There are others, but your space is really tight.
Thank you all for responding !
Click to expand...

I just found a very nice potentiometer, N-15 from Piher,
Don't know yet if it's accurate enough,
but it's really small (15*15*4.5 mm).
http://www.piher-nacesa.com/pdf/n15.pdf

Stef Mientki

>
 
Does all the encoding have to be inside that package?
A good quality pot and a(an?) SMT ADC might work.

Good Luck!
Rich

Stef Mientki wrote:

I'm looking for a small angle (or rotary) encoder,
I would like to have the following specs:

- (absoluut) angle over minimal 300 degrees
- diameter < 20 mm
- thickness < 10 mm
- accuracy +/- 2 degrees
- small quantities (10 .. 100)

Any ideas ?

Stef Mientki
Click to expand...
 
Did you try looking at the Mouser Website or Digikey. They have 1000'sof
components and very cheap any size shape smell and color
"Stef Mientki" <s.mientki@mailbox.kun.nl> wrote in message
news:bmhpq0$42o$1@odysseus.uci.kun.nl...
happyhobit wrote:

http://www.photocraftencoders.com/SR12.htm

thanks Jay,
but it's much to "thick" or "heigh", >8 mm ;-(
Stef


Jay
Click to expand...
 
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