Re: [Emc-users] What is the life of a rotary encoder?

2017-03-01 Thread Jon Elson 
On 03/01/2017 04:40 PM, Steve from Tube Gauge wrote:
> 
>   
> 
> 
> Hi, I have a 1988 First CNC mill that I am considering 
> retrofitting to accept LinuxCNC. The motors are Fanuc red cap with 
> 1 ppr.  How long will these encoders last? They are all ready 
> 29 years old. I have other machines with dying encoders and linear 
> scales and it usually starts with the marker pulse. I just wonder if 
> money is better spent on new normal encoders rather conversion systems to 
> work with the old Fanuc stuff. That being said, sometimes the newer 
> stuff is less durable than the old components.
The Fanuc red cap encoders are VERY well built.  If you 
don't drop them, or get coolant inside them, they should 
last practically forever.

OK, the 1 count ones are from the earlier series, before 
they went to the serial type.  I have several of those here, 
and they are still going strong.  The 1 line encoders 
provide 40,000 quadrature counts/rev, and they have the 
commutation signals also (which do need a converter).  You'd 
need to machine a mechanical adaptor for other encoders, and 
then get them phased to the motor windings.

Jon

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Re: [Emc-users] What is the life of a rotary encoder?

2017-03-01 Thread andy pugh 
On 1 March 2017 at 22:40, Steve from Tube Gauge  wrote:
> How long will these encoders last?

If they are from 1988 then I would expect them to use LEDs rather than
filament bulbs, so they ought to last a long time.

But then, they have already lasted a long time :-)

They are probably in a good part of the bathtub curve, actually. And
would you be replacing them with anything of the same cost/quality?

-- 
atp
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