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Hey... I got shafted! ;)


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#1 havlicek

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Posted 20 April 2018 - 07:19 AM

This is another variant of the Mabuchi FC280 "doorlock" motor, this time the long shaft one. Aside from the same adaptation of the open end for a standard D motor endbell (this time a Parma), I also shortened the can to get rid of the old tabs. I was going to machine both ends of the can anyway, so I just went a little farther on the open end, because there's still plenty of room in there for a slightly-longer-than-26D stack length and full length comm. 

The result is a can that's not as tall as a 26D, and significantly shorter than a C-can...* a nice size for a motor for either a vintage type chassis or a more modern one, a motor that could go inline, anglewinder or even full sidewinder with no problems.

*If course, there's no real need for so much shaft, so it will get cut down to a reasonable length. :)

IMG_2706.JPG
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John Havlicek




#2 old & gray

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Posted 20 April 2018 - 07:36 AM

John,
 
This looks like a very interesting project but the one word that keeps coming to mind is - 'Pinocchio.'
Bob Schlain

#3 Racer36

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Posted 20 April 2018 - 07:39 AM

Motor in the front... business in the back...

Dennis Dominey

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#4 Rob Voska

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Posted 20 April 2018 - 07:40 AM

How about using it for a mid-motor inline car?
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#5 havlicek

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Posted 20 April 2018 - 07:51 AM

Hi guys,
 

Motor in the front... business in the back...

 

How about using it for a mid-motor inline car?

 
For sure, the idea of a "mid-engine" layout occurred to me, but those sorts of things are best left to the builder. For that to be the way to go, a second support bushing would have to be engineered into the chassis, further aft of the motor bracket, because the design would put extra stress on the shaft where it exits the can... more "leverage." That wouldn't be a difficult thing to do, but I think a "smart" thing to do.


John Havlicek

#6 Lone Wolf

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Posted 20 April 2018 - 09:05 AM

Flawless as usual.   :good:

 

If I ever need a motor for this I know where to go.   :)  

 

DSC03056.JPG

 

"They say that cat Shaft is a bad mother#@*$%, John Shaft."  Isaac Hayes


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Joe Lupo


#7 Geary Carrier

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Posted 20 April 2018 - 09:51 AM

Ahh, the old shaft.

 

What did you do with the can bearing?

 

Looks real good, John...


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


#8 Jaeger Team

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Posted 20 April 2018 - 11:08 AM

This looks like a very interesting project but the one word that keeps coming to mind is - 'Pinocchio.'

 

Of course, like "Mastro Geppetto," JH is a carpenter, too.


Maurizio Salerno

#9 havlicek

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Posted 20 April 2018 - 02:11 PM

What did you do with the can bearing?

 

I swapped it out for a modern 5mm oilite. On these cans, after machining the bushing flange flat, a 5mm still fits well enough to not have to go to a 6mm.


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John Havlicek

#10 Alchemist

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Posted 21 April 2018 - 09:48 PM

Hi John,

 

I've never seen a stock motor with that long of shaft.

 

In this configuration, does the shaft, being that long, "whip" at the pinion end of the shaft and prevent it from being applied as a mid-engine inline setup?

 

Would you need some sort of stabilizing bracket for the shaft end, to run in an inline configuration?

 

Thank you.

 

Ernie


Ernie Layacan

#11 havlicek

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Posted 22 April 2018 - 06:02 AM

Hi Ernie,

Per my post above:

 

 

 

For that to be the way to go, a second support bushing would have to be engineered into the chassis, further aft of the motor bracket, because the design would put extra stress on the shaft where it exits the can... more "leverage." That wouldn't be a difficult thing to do, but I think a "smart" thing to do.

 

 

I *think* that, besides a bracket to hold the motor to the chassis (*although the motor could be only soldered in place), a bracket to hold the shaft closer to the crown/pinion, as well as the rear axle would be a smart move.  That would be like Joe's mid-motor inline Mabuchi above.  His has a shaft coupling and shaft extension, so it would be even more important in that case, but the same physics are in play with such a long shaft.


John Havlicek

#12 Alchemist

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Posted 22 April 2018 - 10:32 PM

Hi John,

 

Thank you for the kind and patient reply.

 

I apologize for having overlooked that information.

 

Ernie


Ernie Layacan

#13 havlicek

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Posted 23 April 2018 - 05:07 AM

...always welcome Ernie.  Speaking of all this, I got the arm done.  39T/#27awg, and it should be a VERY fast critter.

IMG_2708.JPG


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John Havlicek





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