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Old Jun 24, 2006, 12:59 PM
Kansas is windy.
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Wichita, KS
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How to remove shaft from BP-21

I bent the shaft on my BP-21 and need some advice.

can this be removed? and if so, how?

Also, can I replace it with a shaft from, say, a GWS EPS-350C gearbox?

Thanks,

Phil
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Old Jun 24, 2006, 01:24 PM
Registered User
Joined Oct 2005
552 Posts
Quote:
Originally Posted by pburress
I bent the shaft on my BP-21 and need some advice.

can this be removed? and if so, how?

Also, can I replace it with a shaft from, say, a GWS EPS-350C gearbox?

Thanks,

Phil
Phil; Click on this ,scroll down towards the bottom of the page to
" disassemble motor" Also a replacement shaft is sold for the BP21.
http://www.bphobbies.com/view.asp?id...97&pid=U422859
Bob
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Old Jun 24, 2006, 03:05 PM
Kansas is windy.
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Wichita, KS
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Thanks, got it!
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Old Jun 24, 2006, 03:36 PM
Space Coast USA
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I straighten those kind of shafts all the time. If you have a drill press, it's easy. You might even try putting the shaft in a regular drill chuck. Questions?
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Old Jun 24, 2006, 04:04 PM
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Niagara Falls/Toronto area
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Good instructions there, Bob, but I do question the tool choices - I don't own an adjustable wrench, and I never will (again ). On step 3, I strongly advise that you put the motor inside a clear plastic bag first, or you will lose the e-clip for sure (ask me how I know ).

If it were my motor, I'd just grind off the bent part with a dremel/cut-off wheel, and use a wobbly prop adapter instead.

Brad
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Old Jun 24, 2006, 06:19 PM
Kansas is windy.
pburress's Avatar
Wichita, KS
Joined Jun 2003
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Well, since my last post, I got the shaft out, straightened it, installed a prop adapter, flew it in my Formosa, and crashed it! I haven't checked the motor damage yet... Thanks for your help!
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Old Jun 25, 2006, 01:34 AM
phillyphly
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United States, PA, Philadelphia
Joined Sep 2005
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Quote:
Originally Posted by hoppy
I straighten those kind of shafts all the time. If you have a drill press, it's easy. You might even try putting the shaft in a regular drill chuck. Questions?
Yes! How do you get the shaft back to true with a drill press? Spin the shaft into a steel block with a hole of the same diameter?

I've never been able to bend or hammer mine straight and have gone to wobblies to prevent bent shafts also
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Old Jun 25, 2006, 01:50 AM
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If you do shorten the shaft, be sure to put the nut on BEFORE you grind the shaft down.
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Old Jun 29, 2006, 10:35 PM
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New Caney, TX
Joined Jan 2006
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Quote:
Originally Posted by world_hobby
If you do shorten the shaft, be sure to put the nut on BEFORE you grind the shaft down.
WH, you actually gave the guy some good advice. Yup, put the nut on first. After you cut the shaft, then remove the nut and it will help straighten the threads.
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Old Jun 30, 2006, 07:18 AM
Space Coast USA
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Quote:
Originally Posted by e-guru
Yes! How do you get the shaft back to true with a drill press? Spin the shaft into a steel block with a hole of the same diameter?

I've never been able to bend or hammer mine straight and have gone to wobblies to prevent bent shafts also
Place the shaft in the chuck up to the bend.
Put an object on the drill press bed that is parallel to the shaft/drill chuck. This will be your test guage.
Turn the chuck by hand and compare the angle of the shaft to the object. You can easily see if it's straight or not and which way it is crooked.
Tap lightly on the crooked side and compare it with the test guage. Continue to do this till the shaft is parallel with the test guage.
Finally, turn the drill press on and see if any wiggle remains. If it's too much, go back to step 1.
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Old Jun 30, 2006, 09:25 AM
phillyphly
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United States, PA, Philadelphia
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Thanks, hoppy!

I see that the drill is visual aid and not an "automatic shaft straightening jig"
Good idea nonetheless!
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