[Noisebridge-discuss] Filling order for MA3 Miniature Absolute Magnetic Shaft (Rotary) Encoders

[Michael Shiloh]

hey corey! nice to see you here!

isn't dead reckoning flawed? or are you tolerant of these flaws?

Corey McGuire wrote:
> Hey all, new to the list but been to NB a dozen times.
> 
> I am filling out an order for a project Christie and I are working on.  
> The application we have is, we need position sensing for steering and 
> dead reckoning for robots.  There are a number of considerations and 
> we've had a tough time finding one thing that does it all:
> 
>     * Absolute encoding
>     * High Resolution (positions per revolution)
>     * Cycles (many as low as 20,000 revolutions!)
>     * Size
>     * Pin-out (many encoders require up to 8 digital IO each)
>     * Price
> 
> But with the advice of the good Dr. Foote, we may have found what we 
> need.  It's almost too perfect!
> 
> http://tr.im/abmag
> 
>    1. It's got Absolute encoding
>    2. It has 10bit or 12bit resolution.  Up to 4096 positions per
>       revolution! (We were going to settle for 16!)
>    3. Cycles are in the millions, depending on the load
>    4. .3" in diameter
>    5. 3 pins
>    6. As low as $36 for single orders
> 
> Ok, so these are 5 times as expensive as the encoders we were going to 
> use, but the cheap encoders meant we were either going to need serious 
> hardware to read all the data, or we were going to need an Arduino per 
> encoder.  They may still have been cheaper, but not when considering our 
> labors.
> 
> There are two models I am interested in.  They are identical except that 
> one uses bushings and one uses ball bearings.  The ball bearing model 
> has a long life, can operate at higher speed, is less weight and may be 
> smaller.  The price difference starts at $6.
> 
> If anyone else is interested in getting in on an
> 
> MA3-P10-125-N
> 
> Quantity 	Price
> 1	$36.00
> 10	$31.54
> 50	$27.78
> 100	$23.89
> Over 100 	Call for quote
> 
> 
> MA3-P10-125-B
> 
> Quantity 	Price
> 1	$41.80
> 10	$37.34
> 50	$33.58
> 100	$29.69
> Over 100 	Call for quote
> 
> 
> We are interested in getting a bulk order in, not just to lower price, 
> but because we thought others might be interested, and the more 
> interested people we have, the more brains we have to pick should there 
> be problems.
> 
> What say ya'll?
> 
> Ciao!
> 
> -- 
> Success is a tasty spirit distilled from bitter failure
> --Coreyfro
> 
> 
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