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Best Way to Straighten out you bent prop shaft??

Old 08-12-2006, 11:20 PM
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Default Best Way to Straighten out you bent prop shaft??

Hey all, I bent my prop shaft on my outrunner and cant get the thing dead straight, whats the best way u guys use?? I was thinking of a threaded tube...

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Old 08-17-2006, 12:48 PM
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If it is bent about an inch from the motor, simply cut it off and fit it with either a prop adapter or a prop saver.

Otherwise, just replace it. I don't believe you can ever get it perfectly balanced and will eventually end up causing problems due to vibration.
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Old 04-21-2011, 06:00 PM
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Default Bent Motor shaft

Trust me, replace it, they are usually pretty cheap and you will prolly never get it straight. Voice of (limited) experience.
Best of luck, Fly
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Old 04-21-2011, 06:51 PM
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VERY VERY hard to get properly straight again. I have a mongo drill press and a special device called a dial indicator that is perfect for the job and I can seldom do better than 0.003 and often no better than 0.006. You can't see that with the naked eye or the 'glass top roll' but it shows on the motor.

For the most part and by far the best results > replace. While out spin the bearings with a pencil point. Often (most often) a crash hard enough to bend a shaft dings the bearings too. They do not like impact side loading. They should be absolutely smooth.
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Old 04-21-2011, 07:15 PM
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Another vote for 'replace'.. it's best to keep a couple of spares. Even if you could get it dead straight (which is all but impossible) it would be weakened.

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Old 12-30-2011, 06:06 PM
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Replace it been there...
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Old 12-31-2011, 01:44 AM
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Originally Posted by coritco566 View Post
Replace it been there...
This is an old thread, but agreed, replace the shaft.

Some of the shafts are hard steel, bending them back can result in those shafts snapping off. Other issues, its very possible the shaft is bent both outside the motor and inside the motor. And, in between is the motor ball bearings on that shaft. Often those ball bearing get "Ball Dented" on the bearing races. The motor will run, but those bearings are going to fail much sooner than expected.

I've also tried to straighten motor shafts, by mounting the motor in my 12 inch Lathe, and dial indicating the motor shaft. It's a lot of work, but found that Hacker motors has those shafts for my A40-10L motor for five bucks. Not worth messing with bent shafts.
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Old 03-15-2012, 06:04 PM
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Get some drill-bit blanks from an engineering supplier and there you go ...
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Old 03-15-2012, 07:16 PM
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Im going to chime in here and agree with everyone who says to replace the shaft. If you don't get it perfect, you will shake your plane apart. I saw a bent prop shaft rip the whole nose off from a foamy a few years ago. Heads Up RC has replacement shafts that will fit a bunch of different motors.
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Old 03-15-2012, 08:10 PM
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I totally agree ... replace, replace, replace, but IF on the odd occasion, you can't get your hands on a replacement shaft, and don't want to toss the motor, a drill bit blank works like a charm HSS and straight as an arrow
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