[GreenKeys] calibrating speed on a 14 and 15

[COURYHOUSE at aol.com]

yikes We  have a general radio stroboflash here  somewhere.......
 
I feel really fortunate we were presented  with a new in wrapper  tuning  
fork  got  87.6  so  good to go that way  too....
 
Ed#
 
 
In a message dated 9/24/2016 6:20:06 P.M. US Mountain Standard Time,  
drlegendre at gmail.com writes:

(And then the newb chimed in with..)  


Can't you use a common $25.00 optical (laser) tachometer? Do the simple  
laser tachs lack sufficient accuracy or resolution for the job? What about  
good old-fashioned strobe discs, illuminated by a neon + diode  lamp?


On Sat, Sep 24, 2016 at 6:48 PM, Howard Weeks <weeksh at att.net> wrote:

The  tuning fork frequency is 87.6 vps. My memory is flakey at my age but I 
 believe the motor rotation speed was supposed to be 1800 RPM.

When  you watch the black and white blocks on the governor end of the motor 
 through the viewing slot on the fork, a motor that is running the correct  
speed will have the blocks setting still - not drifting to the right or  
left. I believe a strobe set to 87.6 flashes per second would accomplish the  
same thing.

Howard K5JCP

On 9/24/2016  3:26 PM, Richard Knoppow wrote:

Could not some other method than a tuning fork be used?  I am  not at
all familiar with the calibration procedure but it seems to me  that an
audio oscillator and counter could be used, or if its visual  could be
used to trigger a stroboscope.  This is providing the  correct frequency
is known which I suppose it is.

On 9/24/2016  2:34 AM, simon wrote:

Hi  all,

as I have two machines that are in need of speed calibration  and lack
the tuning fork but have a abundant amount of Arduino's,  oscilloscopes
and frequency generators at my disposal, what rpm are  the motors
supposed to run on. Of course these are the governed  motors with the
speed changing wheel in the external interrupter  part.

there are white and black blocks on the outside.

I  remeber reading about a electronic speed control someone build, but  I
am unable to locate the info.

Besides that, I am working on  a ESP8266 to heavy metal box, so that our
beloved machines can  connect to Wifi and do all kinds of stuff. the
Software Library used  just passed sending serial 50 baud tests. Now I am
working on  receiving part. Then finally do the internet part, but as
that part  is already done by someone else, i merely need to wite the
right  calls to the library for that. Then I will be able to attach  the
machine to IRC , twitter, whatsapp (if available) and maybe  itelex.

but first the speed  issue...




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