[GreenKeys] Wrong cam on model 15

[Harold Hallikainen]

Interesting! I thought the difference between holding and pulling were:

Pulling: Armature pulled by magnet requiring stronger magnetic field. This
resulted in the coils being in series with a current of 60 mA.

Holding: A cam pushes the armature to the magnet and releases it at sample
time. If the armature stays, it's a mark. If it falls, it's a space. Not
as much magnetic flux is required to hold the armature compared to what is
required to pull it. So, the coils can be put in parallel for 60 mA (30 mA
in each coil instead of the 60 mA for pulling), or the coils can be put in
series for 20 mA.

Is the only difference between holding and pulling the presence of the cam
to push the armature up and the wiring of the coils (parallel vs series
for 60 mA)? Or are there other changes?

Harold
https://w6iwi.org


On Sat, September 14, 2024 8:53 pm, Steve Kittelsrud wrote:
> Hi All,
>
> I have been working on my model 15 and found something tonight that I hope
> explains all of my issues that I have been having. I have a holding magnet
> on my machine, and I found i have a cam on the main shaft for a pulling
> magnet. My cam is stamped with a 'CX' and it should be stamped with an
> 'M'.
> I have a parts order into Paul, but am hoping I just need the new cam,
> along with the correct retaining disk on the end.
>
> Would this cam mixup allow for 'almost' perfect copy with very little
> range
> on the rangefinder?
>
> Am I going to find that I need other supporting parts when I change out
> the
> cam?
>
> Hoping this fixes my issues, I am practising my stress reduction
> meditation
> working on this machine. I feel it is so close to working perfectly, but I
> keep failing to get there....
>
> Thanks all!
> --
> Steve K.
> KB0WSV
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