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(Topic ID: 127701)

DIY: Repair 20-10293 Reed Switch


By lyonsden

5 years ago



Topic Stats

  • 60 posts
  • 11 Pinsiders participating
  • Latest reply 8 days ago by swinks
  • Topic is favorited by 41 Pinsiders

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There are 60 posts in this topic. You are on page 2 of 2.
#51 4 years ago
Quoted from german-pinball:

A friend of mine made a 3D-grafic and we want to put it on a 3D-printer the next days and want to see the result.

Nice!

#52 4 years ago
Quoted from lyonsden:

... Most of these are mounted below plastic (ramp, insert), so 9mm range is probably too much. ...

Thats ABSOLUTLY correct - my grafics above are in this way misleading, as I drawed a playfield and not a plastic ramp or so. As far as I know, none of these reed switches is used through wooden playield. 3-5mm range should be OK, so the magnets could be weaker - my guess only.

#53 4 years ago
Quoted from german-pinball:

Thats ABSOLUTLY correct - my grafics above are in this way misleading, as I drawed a playfield and not a plastic ramp or so. As far as I know, none of these reed switches is used through wooden playield. 3-5mm range should be OK, so the magnets could be weaker - my guess only.

Yes -- that is my thought as well: 3-5mm sensing should be perfect.

#54 4 years ago
Quoted from DDDwingmaster:

I did some experimenting with parts laying around. Using two 10x2mm round magnets and a 15mm reed contact, a ball could be detected 9mm away. Impressive. With two 3x2mm round magnets the sensing distance was about 3mm. Need to order some more more size magnets like 5mm and 8mm magnets to test.
...

What magnets did you use? Neodym or Ferrit? Neodym are much stronger ...

#55 4 years ago
Quoted from german-pinball:

Thats ABSOLUTLY correct - my grafics above are in this way misleading, as I drawed a playfield and not a plastic ramp or so. As far as I know, none of these reed switches is used through wooden playield. 3-5mm range should be OK, so the magnets could be weaker - my guess only.

Safecracker uses them under wood - the top three rollovers use them.

#56 4 years ago
Quoted from Coyote:

Safecracker uses them under wood - the top three rollovers use them.

OOPS - thanks for the hint!!! Did not look under the playfield of my SC for a long time.

Here is an intersting link about magnets:

https://standexelectronics.com/products/permanent-magnets/

#57 4 years ago
Quoted from german-pinball:

What magnets did you use? Neodym or Ferrit? Neodym are much stronger

I tested with neodym ones (unknown strength rating). These where the only ones I had laying around.

Near the maximal sensing distance the ball is not attracted very much. Moving the ball over the sensor you can just feel it. I think on an angled playfield the ball will just roll of it.

I would not think using different magnet material would make much of a difference.
The pinball need to capture enough of the magnetic field for the reed to react. So it would always be attracted to the magnet. The magnet strength would likely be the main driver for sensing distance. That sets the field strength around it.
Possible differed reed contacts would improve the sensitivity, and thus decreasing the change in field strength needed.

Nice design. It looks like an injection molded part. Hope you can find the correct size and strength magnets for it.

5 months later
#58 4 years ago

I just published on thingiverse a 3d printable sensor pinball sensor with instructions how to build one. See here: http://www.thingiverse.com/thing:1652237. The maximal distance to detect a pinball is about 4.5mm.

tn_IMG_20160619_132648_(resized).jpgtn_IMG_20160619_132638_(resized).jpg

#59 4 years ago
Quoted from DDDwingmaster:

I just published on thingiverse a 3d printable sensor pinball sensor with instructions how to build one. See here: http://www.thingiverse.com/thing:1652237. The maximal distance to detect a pinball is about 4.5mm.

Nice work! This is exactly the missing piece that people need to build their own from scratch.

4 years later
#60 8 days ago

just found this thread and wanted to ask a question dddwingmaster / german-pinball / lyonsden

firstly this is a great thread and want to make this type of magnetic reed switch for a personal mod and your thingiverse article looks good dddwingmaster as well as all the other info especially the graphics german-pinball .

Question: on the thingiverse design there is no diode and on the graphic and original bally/wms there is a diode - what is the purpose of the diode?

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