7 replies to this topic

[havlicek]

     Pablo needed an end-bell-drive arm for a sano FT16D build he's doing.  He asked for a #29 awg arm with mild timing on a .550" long stack, but also for an arm that would finish at .540" diameter.  So, that means pressing an arm with .560" diameter lams, so it could later be ground to it's final O.D.  Working out a wind, I landed on 52/29 which worked pretty much dead-bang as a reverse wind...so who am I to argue?  Having the reverse wind in my mental rolodex has opened-up more possibilities for all sorts of things.  Here, the larger diameter arm and #29 wire just worked together.

[Pablo]

      Perfect

[Kim Lander]

SWEEEEEET.

[Alchemist]

Hi John,

 

Please pardon my "lack of knowledge", but what is the purpose of a "reverse wind"?

 

Thank you.

 

Ernie

[Rotorranch]

Hi John,
 
Please pardon my "lack of knowledge", but what is the purpose of a "reverse wind"?
 
Thank you.
 
Ernie

I was wondering the same thing.

 

Rotor

[Pablo]

I found this using the Slotblog search feature. Typed in "reverse wind" and clicked the green button:

 

http://slotblog.net/...e-reverse-wind/

[Alchemist]

Hi Paul,

 

Thank you for the reminder that there is the "SEARCH" feature!

 

It's appreciated!

 

Ernie

[havlicek]

I found this using the Slotblog search feature. Typed in "reverse wind" and clicked the green button:

 

http://slotblog.net/...e-reverse-wind/

 

Thanks Pablo

There are all sorts of little tricks and techniques involved with what seems like such a simple thing...winding a neat coil of magnet wire around armature poles.  *As always, the way I happen to do these things is not what should at all be seen as "the right" way...just "my way".  How/where you cross over from each layer to the next, the direction you wind around the stack, even the place you start on each pole (*as in this "reverse" of wind), how you connect to the com (*regular vs. "hemi"), how you reinforce the coils so they don't collapse as you get to the upper layers, how you tension the wire, the "shape" of the coils, how you deal with skinny wire vs big wire...and probably more as well.  After winding many hundreds of these things, you start being able to recall what to do for a given scenario.

Unfortunately, I'm always having to do different winds and on different stacks, so I often start out by doing one pole to try and land on a pattern and wind for the arm and wire gauge.  That's what I did here, and it quickly became apparent that a reverse wind was a good option.  I can force a 50/29 on these .560" lams onto 4 layers, but as a five layer coil, it's pretty much a natural by adding two extra turns.

On the smaller lams, 50/29 (G12) is something I wind a lot of, and I do those my "regular" way.  Whatever works!