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A "Black Beauty" Mura to bring In the new year


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#1 havlicek

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Posted 27 December 2016 - 06:55 AM

For what might be my last motor of 2016, I rummaged around in my box-o-stuff and came up with the cleanest Green Can I could assemble, and came up with this lovely beast.  Everyone by now is most likely bored-to tears over the particulars with cleaning these things up, grinding out the inside of the can welds, centering and fixing the mags, installing the can bearing..."whatevah".  Cut to the chase...I got it all together with only the one thing that happens as often as not with these things, the end bell plastic stripped out when reassembling the hardware.  No problemo, I used my last four black buttonheads (Microfasteners doesn't have them any more!), which are longer and bite like heck for a super-strong assembly.  To go with all this beautiosity :) , I wasn't going to go with anything less than a #25.  I called up my "armature guy", and he did me up a 21/25 on a .480" stack.  This motor has what may be my last set of the correct length magnets, and a short stack just wouldn't be right anyway.  This baby will have plenty of "grunt & scream" to push a glorious lead-sled and slam the bank!

IMG_1899_zpswdypkvlk.jpg

 

The pinup shots:

IMG_1900_zpsaxecf9w6.jpgIMG_1901_zpss4dezs7k.jpg

 

The force is DEFINITELY strong with this one!

 

-john


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John Havlicek




#2 Kim Lander

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Posted 27 December 2016 - 07:48 AM

The name "Black Beauty" doesnt say it enough, thats way beautiful.


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#3 havlicek

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Posted 27 December 2016 - 08:13 AM

Thanks Kim.  I'm kinda fond of her myself!  :D

 

-john


John Havlicek

#4 boxerdog

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Posted 27 December 2016 - 09:52 AM

Outstanding as usual, John.

 

Here might be some screws:

 

http://www.fastener-...ck-oxide_1.aspx


David Cummerow

#5 Mach9

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Posted 27 December 2016 - 10:34 AM

Nice! Is that the original finish on the can? What's the best way to reproduce that finish? Merry Christmas!


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Mack Johnson
'86 Mustang footbraker
6.435 @ 104 MPH
NC Slot Car Tracks - Past and Present


#6 gc4895

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Posted 27 December 2016 - 11:10 AM

Actually love the detail in cleaning and preparing these beauties. I learn something every time and have transferred the knowledge to my own motor building attempts. Honestly, the work here has been very encouraging to me to learn to master the details necessary to assemble good, working motors. It's all in the details and learning those has been fun! Thank you for the good work and taking the time to share the "how and why".
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Mark Bauer

#7 Geary Carrier

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Posted 27 December 2016 - 11:20 AM

Hi John,

 

Beauty, yes...

 

Beast, yes...

 

Thanks,

g


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


#8 olescratch

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Posted 27 December 2016 - 01:18 PM

Speaking for myself, seeing your work only helps to make me try my best to "copy" the procedures to produce the best work that I can.  Repetition can only lead to understanding, isn't that the way they do it in schools?  Sometimes you have to beat things into "hardheads" to get them to catch on lol!  Keep on providing those of us that return here daily to see what the days lesson is about with your craft, not at all boring! 


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John Stewart

#9 Racer36

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Posted 27 December 2016 - 03:03 PM

Could you use this virgin for one of your projects, John?

I will send it to you if so.

Cheers.

IMG_1167.JPG

Dennis Dominey

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#10 havlicek

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Posted 27 December 2016 - 04:11 PM

Outstanding as usual, John.

 

Here might be some screws:

 

http://www.fastener-...ck-oxide_1.aspx

 Hi Dave...and thanks as always!  I only saw machine screws at your link.  While I could use those by tapping the end bells...or even "forcing them" and using the screw as a tap, I prefer to use #2 sheetmetal screws (buttonhead/black oxide .050" hex drive).  Microfasteners used to sell them but doesn't seem to carry them anymore.  I have them in bright/plated, and those are fine, but for this project I think black was definitely the way to go.

 

 

 

Nice! Is that the original finish on the can? What's the best way to reproduce that finish? Merry Christmas!

 

Hi Mack and Merry Christmas to you also!  The finish is just an automotive high temp "wrinkle black".  How much it "wrinkles" depends on how heavy you spray and how you cure the stuff.  It can turn out anything from slightly textured to waaaaaaay wrinkled.

 

 

 

Could you use this virgin for one of your projects John?
I will send it to you if so.

 

Hi Dennis, good to hear from you again...PM sent.

 

-john


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John Havlicek

#11 boxerdog

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Posted 27 December 2016 - 07:47 PM

John, I guess I just assumed that you tapped the endbells....I will keep looking and let you know if I find anything.

 

Tower has these, but they are shiny....

 

http://www3.towerhob...1P?I=LXD984&P=8


David Cummerow

#12 havlicek

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Posted 27 December 2016 - 08:03 PM

Hi Dave,

 

     Yep, those are the ones I got.  The original Mura screws are a sort of blunt self-tapping type, not really a "thread-cutting" screw or a machine screw.  They are also just a bit too short for the spring posts.  After one or two times, the little molded-in post insert in the end bell simply breaks off and the screw isn't long enough to grab the end bell beneath.  There were longer screws of the exact same type at some time in the past, but I don't know if they were a Mura product or not.  The good thing about #2 buttonheads is that they are slightly thicker and will also grab a stripped end bell.  The bad news is they can actually crack the end bell.  Tapping the end bell is certainly a good way to go as well, but involves some extra steps.  I may have to go that way at some point, but the shiny versions are a choice...although not 100% correct.

 

-john


John Havlicek

#13 havlicek

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Posted 27 December 2016 - 08:26 PM

OK...so now Microfasteners has the screws again, so I stocked up and got some extra in #0 size as well for installing end bells.

 

-john


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#14 boxerdog

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Posted 27 December 2016 - 09:18 PM

Good info...what size are those neat little screws Bill B has???


David Cummerow

#15 havlicek

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Posted 28 December 2016 - 06:19 AM

Hi Dave,

 

     Those should be #0 size.  The trick is in finding them with an .050" hex drive, as some use a smaller allen wrench, and I just realized the ones Microfasteners has use a .035" wrench DAGNABBIT :)

 

Anyway, here's a link to their website in case anyone is looking:

http://www.microfasteners.com/

 

-john


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#16 wbugenis

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Posted 28 December 2016 - 09:23 AM

Good info...what size are those neat little screws Bill B has???

 

The screws I have are   self tapping,  0.210" long      0.055'" dia    Black button head   .050 hex


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William Bugenis

#17 Mark Johnson

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Posted 28 December 2016 - 09:29 AM

the rjr screws were my favorite 



#18 havlicek

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Posted 28 December 2016 - 04:30 PM

Those screws that Bill B. has are excellent.  They're long enough to bite when the short ones have stripped.  DEFINITELY hook up with Bill if you need can/end bell screws and tell him John sent you.  :D

 

-john


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John Havlicek





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