Brushless Motor Construction Discuss design and construction of custom Brushless motors

replacement shafts

Old 04-10-2013, 09:18 AM
  #1  
BBCorvette18
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Default replacement shafts

ok I have a turnigy d3536/8 motor that has a bent shaft. The shaft is 5mm x 54mm. Can I get any 5mm shaft or should I get the actual turnigy replacement?

I think any 5mm shaft with a legnth close would work I just want to confirm that is most likely the case or there's something I'm over looking
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Old 04-10-2013, 11:49 AM
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gramps2361
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Take a look at this one from HURC. I have cut down shafts to use myself in different brand motors. Might have to grind a flat for the set screw to line up with the motor you have.
http://www.headsuphobby.com/Replacem...m-Z-100-20.htm
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Old 04-10-2013, 05:20 PM
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Wildflyer
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I'm not sure about your motor, but some use a groove cut into the shaft for a snap ring which keeps the rotating parts from flying off.
In some cases you can extend the shaft and install a collar with a set screw on the extended shaft, and drill a hole in the firewall.
The groove for a snap ring is hard to do properly unless you have a small metal lathe.

I recently bent the shaft on a SuperTigre ST 10 outrunner, it is not replaceable.
I chucked the prop end of the shaft in my drill press, and rotated the drill press by hand until I knew exactly the high point of the bend. I used a Harbor Freight digital caliper to find it. Then I tapped firmly on the shaft at that point. In a few minutes, I was able to reduce the runout or bend to about 1-2/1000". Shaft was bent over 1/16" when I started.

Motor runs great, prop tracks perfectly, no cost, I'm happy.
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Old 04-10-2013, 07:21 PM
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BBCorvette18
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yeah I had to push the shaft through the motor and am on using the set screw right now so I figured any 5mm shaft should work. the plane still flies fine I just want to fix it in the near future and have an order to place at hurc so I'll get the 5mm shaft from them instead of hk
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Old 04-15-2013, 05:24 AM
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solentlife
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For replacement shafts I usually use RCTimer.com .... they have shafts of various diameters and lengths. The different lengths can be a great advantage at times .... and RCTimers have C clip grooves often in two places to allow different configs.
At cents per shaft .... well worth it ...

Nigel
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Old 04-15-2013, 05:36 AM
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fhhuber
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You can skip the snap-ring and use a wheel collar with a flat ground on the shaft.

So if you can find "music wire" of the correct diameter... you can replace your outrunner shafts with any reasonable length you desire.

Find the dia and length shaft you need. You can make it work.
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Old 04-15-2013, 09:01 AM
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hillbille
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Industrial supply stores (or do some online shopping) to get drill blanks in ANY diameter desired. The real drawback is that drill blanks will shatter on a direct hit as they don't bend much.

Hillbille
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Old 04-15-2013, 09:15 PM
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solentlife
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Proper shafts (usually case hardened steel) are so cheap from such as RCTimer and other online - is it really necessary to use DIY stuff ?

Drill blanks are notoriously brittle ... but yes I've used them... but only as temporary fix.

Piano wire - often has slight bend in and is the opposite of drill blanks in being too strong IMHO - you break the motor rather than shaft in hard hit.

How many people have knackered motors lying around their bench ? I keep them for :

Shafts - spares for other motors
Magnets - good for canopies and other uses
Bells - in case another motor gets damaged
Bearings - with care they can be extracted and used in another motor as temporary fix

But then again - I'm well known as a scrooge ! I even accept others cast-offs !

Nigel
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Old 04-15-2013, 10:00 PM
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DHC Beaver
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Another good source for nice bits of shafting are old printers.They are being thrown on the heap by the thousands.
All the plastic bits go in the recycling bin,so you're actually being green.
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Old 04-15-2013, 10:29 PM
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solentlife
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I bet if you pulled apart many items we usually throw away - you'd find useful items for modelling ...

Nigel
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