Technical, Techniques, Hints, and Tips > DC Motors (Brushed) and Speed Controllers

motor spindle

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Trucker:
hi, all
is there an easy way to confirm that my motor spindles are straight and true, i have one that whilst connected to the prop shaft when rotated by hand (no power connected) it appears lift at a certain point which is a bit puzzling for me, ive contacted the seller and they suggest sending it back but i just wonder if i could confirm any probs


Trucker

john44:
Hi trucker, what coupling are you using? It could be drilled off centre, motor or prop,
causing a high point, I have Come across that problem.
Is the prop shaft threaded, could be a poor thread,or the shaft could be bent.


Regards
John

TailUK:
Proper tool for the job would be a Dial Test Indicator.  If you don't have access to a DTI a cheap and cheerful alternative is a ball point pen. Secure the motor and set the tip of the pen just touching the spindle,  make sure both the pen and the motor can't move about. Carefully turn the spindle by hand and watch the gap between the spindle and the pen. Any variation will indicate an out of true spindle.

Trucker:
guys
I've had a look at the prop shafts, rolled them over a glass sheet and they appear to be fine, the couplings are black UJ, couplings with brass inserts at both ends, I've crossed the affected motor over to the other prop shaft and I get the same, leaning towards the motor being faulty but find it hard to accept.

john44:
Hi trucker, did you roll the motor shaft over the glass sheet with the brass insert fitted to it?


John

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