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Old 01-12-2014, 03:51 PM   #1 (permalink)
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Default Bottom bearing not aligned with top two. (with solutions)

I followed the manual and did the top two bearings while mounting the servos, but now it doesn't quite line up with the third bearing. Is it OK as is or should I loosen everything up and try to align all three using the main shaft. My gut is telling me yes, but I'm not looking forward to loctiting every screw, again.




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Old 01-12-2014, 04:34 PM   #2 (permalink)
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Rick,

Unfortunately my gut agrees with yours. I would loosen all of the screws and shift the bearing plates around until they line up as best as possible. I they aren't aligned, there may be power-robbing forces present and bearings will wear quickly.

Paul
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Old 01-12-2014, 04:38 PM   #3 (permalink)
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I battled with mine too ended up putting upper and lower metal bearing blocks left middle stock now its fits great. Don't know how many times I loosened the frames thought I had it then tightenend and it would be tight again.
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Old 01-12-2014, 04:39 PM   #4 (permalink)
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Quote:
Originally Posted by flyingw View Post
Rick,

Unfortunately my gut agrees with yours. I would loosen all of the screws and shift the bearing plates around until they line up as best as possible. I they aren't aligned, there may be power-robbing forces present and bearings will wear quickly.

Paul
+1

Loosen all screws, including the ones on the servos, and try and get better alignment (almost always this will be near perfect).
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Old 01-12-2014, 04:40 PM   #5 (permalink)
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Thanks. I just read about a similar problem in another thread. Are most people using the aluminum blocks or the stock ones?

Rick
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Old 01-12-2014, 04:42 PM   #6 (permalink)
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Quote:
Originally Posted by desertstalker View Post
+1

Loosen all screws, including the ones on the servos, and try and get better alignment (almost always this will be near perfect).
I've got a feeling since I choose to put two screws in each end of the servos that it may misalign it even worse.

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Old 01-12-2014, 04:46 PM   #7 (permalink)
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The reason why it is misaligned is because when you tighten down the screws, the block wants to rotate along with the screw. I had this issue on the build. I don't think the piece is warping, but I could be wrong.

To mitigate the issue, tighten each screw a little as you move to the next, until all are tight.

Having said this, as long as there is not significant binding you should be fine.
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Old 01-12-2014, 05:40 PM   #8 (permalink)
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The reason why it is misaligned is because when you tighten down the screws, the block wants to rotate along with the screw. I had this issue on the build. I don't think the piece is warping, but I could be wrong.

To mitigate the issue, tighten each screw a little as you move to the next, until all are tight.

Having said this, as long as there is not significant binding you should be fine.
It seems worse than that. I loosened up every servo and bearing screw and it still won't line up.

Rick
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Old 01-12-2014, 07:06 PM   #9 (permalink)
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Default Bottom bearing not aligned with top two.

Quote:
Originally Posted by rdlohr View Post
It seems worse than that. I loosened up every servo and bearing screw and it still won't line up.



Rick

Is there significant resistance on the main shaft? If not I would just leave it. It sounds like it is causing you an issue through so you may want to replace it.

If you are seeking to replace the part then I guess the CNC upgrade would be a good idea.

Hopefully the frame holes are not misaligned.
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Old 01-12-2014, 07:26 PM   #10 (permalink)
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Quote:
Originally Posted by grovey View Post
Is there significant resistance on the main shaft? If not I would just leave it. It sounds like it is causing you an issue through so you may want to replace it.

If you are seeking to replace the part then I guess the CNC upgrade would be a good idea.

Hopefully the frame holes are not misaligned.
I loosened every screw on the frame to allow it to shift then tried to get the three bearings in alignment. Even without the servos installed, I can't get it great. I can get everything to line up decent with all tight except one side of the middle bearing. As soon as I start to tighten that, it shifts it and causes more binding than I would prefer. You got a link to the CNC part?

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Old 01-12-2014, 07:28 PM   #11 (permalink)
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Default Bottom bearing not aligned with top two.

Yup here it is

http://www.msh-direct.com/cnc-3rd-be...t-mini-protos/
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Old 01-12-2014, 07:31 PM   #12 (permalink)
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Oh, that part is not my problem. If it was, I could shift it 180 and see it change. I thought you meant the upper servo mounts with bearings.

Rick
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Old 01-12-2014, 07:38 PM   #13 (permalink)
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Default Bottom bearing not aligned with top two.

Oh I am sorry I misunderstood. You need 2 of these. If you want to replace them.

http://www.msh-direct.com/cnc-servo-frame-mini-protos/
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Old 01-12-2014, 07:45 PM   #14 (permalink)
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Default Bottom bearing not aligned with top two.

Hopefully I am understanding correctly. Perhaps one of your parts is not molded decently.
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Old 01-12-2014, 08:05 PM   #15 (permalink)
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Yep. Thats what I need but at $25 apiece, I'll struggle a bit more and make this work.

Thanks!
Rick
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Old 01-12-2014, 08:12 PM   #16 (permalink)
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those are hard to find. looks like everyone is out of stock
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Old 01-12-2014, 09:47 PM   #17 (permalink)
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Originally Posted by rdlohr View Post
Yep. Thats what I need but at $25 apiece, I'll struggle a bit more and make this work.

Thanks!
Rick
Once you have everything together as best you can, try heating it up a bit, it can sometimes allow the plastic to stretch a bit and smooth things out.
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Old 01-13-2014, 12:51 AM   #18 (permalink)
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Twisting the frame a bit during install will eventually align all three bearings, at least that did it for me. Wiggle your way there! Yes with the CNC parts its easier, but you should get it to work also with the plastic blocks:

MSH Protos Mini main shaft fit (0 min 6 sec)


When tightening go slowly as mentioned before (main shaft in place). I also like to do the screws on the frame sides in a crisscross pattern. I do a 2nd round to apply locktite.
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Old 01-13-2014, 02:49 AM   #19 (permalink)
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I've built and rebuilt Mini Protos's many, many times and it's always the same - the bottom bearing block doesn't line up with the top two, no matter if it's plastic frames or aluminium ones, I've had all plastic and now all alu and still the lower block doesn't align without tweaking. With every build of mine I found the shaft would drop straight through if I just slightly pushed the bottom block to the port side of the heli.
My standard way of getting a drop through mainshaft therefore is to remove material from the left hand side of the lower block a little at a time till the shaft drops perfectly through. I usually use a course grit wet/dry sandpaper on glass, being sure to keep the block square while moving in figure 8's.
This method has stood the test of time on my birds and heads rotate very, very freely.

Edit: Rdlohr, you should leave all bolts including the servo ones loose until you're at the stage where you have the mainshaft through all three blocks and then ready to start the tightening sequence. Tighten all the bolts in a diametrically opposite sequence, whilst going from side to side doing the same. Only after all the bolts are in and tight and you're happy with the alignment, then remove each bolt one at a time and apply loctite and replace.
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Old 01-13-2014, 05:19 AM   #20 (permalink)
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Thanks all. Sounds like if I work it enough I will be able to get it right.

I think the root cause is that the bearing blocks are not all the same width, and they are all thinner than the bottom and battery mount. This causes the CF to flex when they all get tightened down.

Bottom: 29.90 mm
Battery Mount: 29.90 mm
Top bearing mount 29.55 mm (varies across part to 29.26)
Middle bearing mount 29.77 mm
Bottom bearing mount 29.75 mm

For reference 0.1mm is about the width of a sheet of paper

Anybody know how wide the aluminum mounts are?

Rick
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