[GreenKeys] calibrating speed on a 14 and 15

[Howard Weeks]

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...
>