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1truckerdan
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08.16.2011, 07:08 PM

A few have filed,sanded, or turned down the shaft so 5mm pinions will fit. The shaft is hardened. Take your time and do it right, because all the gears you use have to line up....
   
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Old
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brian015
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08.16.2011, 07:29 PM

If you can use 14, 15, or 16t 6mm pinion, Kershaw Designs has them at a very reasonable price.

Otherwise I'd turn down the shaft to 5mm rather than attempt to drill out a pinion. Follow Neil's instructions:

Quote:
Originally Posted by suicideneil View Post
No worries, you can buy 6mm bore pinions, or you can just do like 99% of other guys did in your situation and grind the shaft down; all you need is padded vice and a metal file / dremel and some digital calipers. Stick the motor in a bag and poke the shaft through it to keep out the filings, then work back & forth along the shaft ( ahem.. ) and keep checking until your 5mm bore pinions fit snuggly. Either that, or sell your $70 motor for a large profit on a heli/ plane forum...
He doesn't say it explicitly, but you want to have the motor spinning while you hold the file up against it to turn it down - that should give you a perfectly round shaft.
   
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  (#33)
suicideneil
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08.16.2011, 10:38 PM

It helps if the shaft is spinning yeah

There are a few threads around with great pictures, here is Linc's:

http://www.rc-monster.com/forum/show...&postcount=261

easy peasy
   
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  (#34)
Pdelcast
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08.17.2011, 12:06 AM

Quote:
Originally Posted by freddy View Post
Is it possible to drill out an 5mm pinion to 6mm with an normal hand held drill?
im using novak ones, if it makes a difference(found them to be the best durability wise)

and Pdelcast it was 70usd not 80
$70? ? ?


OMG, I'm gonna go shoot somebody....


Patrick del Castillo
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Castle Creations
   
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Old
  (#35)
1truckerdan
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08.17.2011, 12:22 AM

I am just happy I got a couple this time. I didn't have the funds to get any when they sold out last time.
Thank the person for all of us that got a second chance before you shoot them.
Daniel
   
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Old
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JERRY2KONE
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No - 08.17.2011, 01:30 AM

Quote:
Originally Posted by freddy View Post
the drill will follow the existing hole, right?

Was more concern about the hardness of the pinion than getting it 110% straight, guess i just gonna give it a try. dont have an drill press, and dont want to bug other to help me

if i sand the shaft down from 6mm to 5mm, i think there will be more risk about getting it straight than drilling the pinion. atleast its better to risk a pion than the shaft.
Yes the drill bit will follow the original hole, BUT a handheld drill will not give you a clean straight hole creating vibration. Sanding the shaft can work better and if you have to drill out the pinion use a drill press to keep the hole straight.


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brainanator
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08.17.2011, 03:35 AM

Quote:
Originally Posted by Pdelcast View Post
$70? ? ?


OMG, I'm gonna go shoot somebody....
I had to laugh when I read this.....good stuff! bet the customers are glad nobody asked you about these motors! haha


OFNA Jammin CRT.5e, Savage Flux HP, MBX5Te, SCX10, Multirotors, foam planes
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pinion ream
Old
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RC-Monster Mike
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pinion ream - 08.17.2011, 11:32 AM

enlarging the bore on a hardened pinion is no trivial task. A lathe is the best tool for the job, along with specialized tooling(a normal drill bit will not make it through). Even if you were successful in opening the bore, you now have .5mm less meat at the set screw area, so it is much more likely to back out. Reducing the shaft is a much better idea and isn't terribly hard with a dremel and grinding wheel.
   
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  (#39)
Pdelcast
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08.17.2011, 01:53 PM

Quote:
Originally Posted by brainanator View Post
I had to laugh when I read this.....good stuff! bet the customers are glad nobody asked you about these motors! haha
Well, when you consider that today JUST THE MAGNETs that go in the 1717 cost more than $70.00....

It's a little silly. But some people got a GREAT deal.


Patrick del Castillo
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Castle Creations
   
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Old
  (#40)
skellyo
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08.17.2011, 04:09 PM

Quote:
Originally Posted by Pdelcast View Post
Well, when you consider that today JUST THE MAGNETs that go in the 1717 cost more than $70.00....

It's a little silly. But some people got a GREAT deal.
I'd hate to see what it costs for the magnets in a 2028. One can only imagine given the ~$150 price increase.
   
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Old
  (#41)
freddy
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08.17.2011, 05:09 PM

Tried drilling the pinion but quickly realised it was a lost case, new metall bit and it was just scratching the surface.
   
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  (#42)
1truckerdan
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08.17.2011, 06:34 PM

but, the magnets in the ones that just sold out were from the " old batch" ......before the 400% increase in materials to make the magnets.
Again...... thank you
Daniel
   
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Pdelcast
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08.17.2011, 09:23 PM

Quote:
Originally Posted by 1truckerdan View Post
but, the magnets in the ones that just sold out were from the " old batch" ......before the 400% increase in materials to make the magnets.
Again...... thank you
Daniel
True, true... But still, I could have sold just the magnets for more than $70.00 ..


Patrick del Castillo
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Castle Creations
   
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  (#44)
1truckerdan
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08.18.2011, 02:20 AM

Now, Patrick........ you are sounding like a Chinese rare earth mineral salesman.
Daniel
   
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Old
  (#45)
freddy
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08.18.2011, 09:09 AM

Quote:
Originally Posted by 1truckerdan View Post
Now, Patrick........ you are sounding like a Chinese rare earth mineral salesman.
Daniel
First the Chinese government funded the mining of rare earth magnet making it artificially low priced, despite it having huge local environmental consciousness(this is one of the reason so few countries is mining).

If you purchased the minerals of any sort when the prices is low doesn't make the mineral less valuable
   
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