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Snatching defeat from the jaws of victory - part I


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#1 havlicek

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Posted 23 December 2017 - 08:12 PM

     So, the other day I was epoxying a set of goofy-strong solid neos in a 26D can.  I had them pretty much set and it was dinner time, so I walked-away, ate dinner and completely forgot about finishing-off the magnets.  I only remembered about them the next morning.  Long story short(er), I screwed the pooch as it were.  Sooo, removing them involved destroying them...a lot of heat.  My fallback position was a set of really strong ceramics I had gotten from some plain-jane industrial type motor.  These measure about 15% stronger than Arcos, which means they're plenty strong.  Speaking of Arcos, using the Arco shim to install these results in a "hole" of around .590", perfect for a .560" diameter arm.  So I cleaned-up the can and headed in a new direction necessitated by my major goof.

     Sometimes I go two steps back before moving one step forward.  In order to redeem myself in the eyes of the slot gods, I drilled the can for a bracket, and the two can stay as a matched pair.

IMG_2402.JPG IMG_2403.JPG IMG_2404.JPG


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John Havlicek




#2 Samiam

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Posted 24 December 2017 - 12:00 PM

Experience is defined as learning from your mistakes.

 

What's up with that wood screw? :unknw:


Sam Levitch
 
"If you have integrity, nothing else matters, and if you do not have integrity, nothing else matters."
     Robert Mueller, special counsel (2013)

#3 James Wendel

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Posted 24 December 2017 - 12:38 PM

Looks like a sheet metal screw to me.


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You can't always get what you want...

#4 havlicek

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Posted 24 December 2017 - 01:00 PM

Experience is defined as learning from your mistakes.

 

What's up with that wood screw? :unknw:

 

Yep...it's just a thread-cutting screw (a little different from a sheetmetal screw, but pretty much the same thing) I barely "stuck" in the hole (so as not to mess up the metal) Sam for illustrative purposes, which is why I didn't screw it all the way in.  I have two hardened screws that I shortened to prevent ruining the armature, and I'll be supplying those along with the bracket and motor.  Some scratch-builders being a bit on the lazy side, I figured I'd make this motor as much "plug and play" as possible.  Still..."wood screw"?   :unknw:


John Havlicek

#5 Samiam

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Posted 24 December 2017 - 01:05 PM

I figured you just grabbed what was handy to mock it up for the pic.

 

You have mentioned a few times you are a carpenter. Any pics of what you do in wood?


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Sam Levitch
 
"If you have integrity, nothing else matters, and if you do not have integrity, nothing else matters."
     Robert Mueller, special counsel (2013)

#6 havlicek

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Posted 24 December 2017 - 05:16 PM

Built-Ins 2.jpg IMG_0001.jpg IMG_0002.jpg Master Bath.jpg


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John Havlicek

#7 Geary Carrier

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Posted 24 December 2017 - 05:48 PM

Just like your motors, Sweet...


Yes, to be sure, this is it...


#8 Samiam

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Posted 24 December 2017 - 07:08 PM

Beautiful work John.  :good: 


Sam Levitch
 
"If you have integrity, nothing else matters, and if you do not have integrity, nothing else matters."
     Robert Mueller, special counsel (2013)

#9 olescratch

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Posted 24 December 2017 - 08:18 PM

Now you know why his motors are as nice as they are, everything HAS to fit for them to come out right.


John Stewart

#10 boxerdog

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Posted 25 December 2017 - 10:40 AM

It's nice to see that there are real craftsmen out there still. 

 

Out here, many of the carpenters are called "wood butchers" for good reason.


David Cummerow

#11 havlicek

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Posted 25 December 2017 - 12:04 PM

Back on the motor!  Armature is done and ready to go out for grind/balance.  A pair of hardened screws cut to length also  Anymore than this and I'd have to build the chassis  ;)  Armature is a reverse wound #26awg making for a three-layer coil on these .560" lams from Bill Bugenis.  "This motor will kill"  :D

IMG_2407.JPG IMG_2408.JPG


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John Havlicek

#12 zipper

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Posted 25 December 2017 - 12:28 PM

Nice winds, John. I remember #26 being a lot more difficult to get neat poles than #25 for instance.


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Pekka Sippola

#13 havlicek

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Posted 25 December 2017 - 01:30 PM

Nice winds, John. I remember #26 being a lot more difficult to get neat poles than #25 for instance.

 

Thanks Pekka.  A lot depends on the laminations (of course!).  Today, there are a bunch of pretty wild lams out there, but if you only have a few to choose from (*like me), you have to sometimes fit a wind on a lam that just doesn't want to cooperate.  Winding backwards can be a real help in some of those cases, and it often makes for a more compact/stable coil that doesn't have that nasty habit of collapsing back towards the com end.  The old Mura .007" lams were the worst in every possible way for winding, even though they were apparently made from very good lamination steel and being .007" thick, made for great arms...after the torture of trying to get them neat.  :)


John Havlicek

#14 zipper

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Posted 25 December 2017 - 01:58 PM

Yes, that was the reason - I only had Mura lams.


Pekka Sippola





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