BEI Engineering Resources for Motion Control Systems

Engineering Resources for Motion Control Systems















 

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) Motion Control Round-up )
Dear Reader,

BEI Newsletter ReaderFor the newest readers of our monthly newsletter, welcome.  And for those of you who have been regular readers - welcome back.  With each newsletter, I usually get some comments back from the readership.  Whether it's a positive comment or just pointing out my spelling errors, I do appreciate the feedback.  It's always satisfying to hear from our readers and we always learn a little something in the communication.

Based on comments we receive I think we have some of the most interesting (and interested) newsletter readers of any group.  I want to thank-you for your continued support of BEI Sensors and your continued comments.  Keep it up.  Now . . . on with the show.
Are you HIP to IP?

BEI Ingress ProtectionYou've probably seen the abbreviation IP used when describing the intended operating environment for industrial products.  Most people understand that IP stands for Ingress Protection, but not everyone that specifies or buys industrial products may understand how to use the IP rating.  Here's the short course.

IP ratings are a shorthand to describe the product's ability to operate through exposure to solids and liquids (specifically water).  The construction of an IP rating includes two numbers, the first number is resistance to solid object penetration on a scale of 0 to 6, where 0 = no special protection and 6 is dust tight.  The second number indicates susceptibility to water ingress where 0 = no protection 8 = complete continuous submersion in 1 m or more of water.

Generally speaking the more "open" the product casing is the more susceptible it is to ingress by solids and liquids and the lower the IP rating. For example IP 31 means it will keep out objects greater than 1mm in diameter, and is protected from dripping water.  By contrast IP 66 means that the product is dust tight and can tolerate strong water jets.

There is also a special case of IP69K which was developed specifically for washdown environments in the food and beverage industry.  It entails testing with a high pressure spray directed at specific angles against the product body as it rotates through 360 degrees.  Generally higher IP ratings represent a more environmentally robust and more expensive product.

You also want to be wary of specifications that carry two different IP ratings for a single product.  For example if the product is rated IP65, but the connector on the product is rated IP54 it means that the connector is really the environmental weak point and you may incur extra expense in trying to protect the connector.

For a more detailed discussion on this subject check out this link.

 

Get Smart
BEI Montessori"We especially need imagination in science. It is not all mathematics, nor all logic, but it is somewhat beauty and poetry."

"We cannot create observers by saying "observe," but by giving them the power and the means for this observation and these means are procured through education of the senses"

"If education is always to be conceived along the same antiquated lines of a mere transmission of knowledge, there is little to be hoped from it in the bettering of man's future"

" . . .education is a natural process carried out by the human individual, and is acquired not by listening to words, but by experiences in the environment."

As you might surmise, these quotes come from an educator and one of some renown.  Maria Montessori, whose schools bear her name, believed passionately in the innate ability of children to learn. Teachers, in her view, did their best work when they sought to nurture and serve this ability rather than to corral it.

She was the first woman physician in Italy in 1894 and she opened a school in 1907 to use her philosophy to teach children in the slums of Rome.  She met with great success and from that beginning, spread the word of her methods throughout Europe, India and the US.

To learn more about this pioneering woman, her ideas and her life, just click on her picture above.  You will find several fine biographies in the link.

 

Can you solve it?  

This month's puzzler solution doesn't rely so much on troubleshooting as it does on the specialized knowledge about absolute encoders.  Like so many customer phone calls, this one involved a systems integrator who had to build a simple conveying system with some equipment that he had inherited.  Since he was on a tight budget he was attempting to make it all work without having to buy additional hardware.  He was struggling with the fact that his absolute encoder was counting "backwards" and he had no "direction control" bit to activate which could reverse the direction of count.  He gave us the model number of the encoder.  It was not a BEI model, but since we keep a pretty extensive library of encoders from all sorts of manufacturers we were able to find a specification sheet.  We discovered one simple fact about the encoder that allowed us to help solve his problem - what was it?

Answer:  It turns out that the encoder he was using had a parallel gray code output.  Gray code is a type of  "symmetric code" which reads the same both forwards and backwards, with the exception of the Most Significant Bit (MSB).  Most manufacturers of this type of encoder include not only the MSB signal but also the inverted MSB signal.  By connecting the inverted MSB instead of the MSB, he was able to reverse the direction of the encoder directly without any other changes.


Blogging Ahead  
We take a quirky look at feedback and how you can use it in your everyday life.  It just might change your relationship to the world.  Click on the BLOG link to read and share your thoughts.
You're Not Gonna Believe This
There are all sorts of amazing things under the sun.  But this BEI Pencil Sculptureone just seems incredible.  Sculpturers have been working in all sorts of media for years.  It varies from clay and wood to marble and metal.  But why anyone would undertake to carve common pencil lead is beyond me.

What's more, the artist does it while it's still in the pencil.  Yes, that's right.  That skinny little spike of brittle carbon impregnated clay is what this guy works on.  Check out the results in the picture on the right.  Click the picture if you want to see more.  It is truly amazing art.
THANKS FOR READING
I appreciate your time this month.  Thanks for thinking of BEI Sensors and give us a call if we can help with your application.  See you next month.
Sincerely,
 

BEI 

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Scott Orlosky
In This Issue
Are you HIP to IP?
Get Smart
Can You Solve It?
Blogging Ahead
You're Not Gonna Believe This
Product Spotlight
Product Spotlight
BEI LT25

Here's a clever device that could be just what you need.  It's a linear cable transducer with a standard encoder quadrature output. The cable makes for flexibility in installation in difficult environments.  Click the picture to learn more.
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