RunRyder - Build-- belt to gear issue

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e-BEAM Beam E4 > Build-- belt to gear issue

SandyEM16
Heliman
Location: Enid, OK

The alignment of the belt from the 2 pulleys to the front tail gear is noticeably off a few degrees..I could see minor but noticable wear on the belt after the first couple of hover flights..I had to press out the one-way about 2 mm to raise the gears up to get the belt in a straight line from the tail tube.. I have checked and rechecked the build.. Whats up with this?

Sandy

04-16-2008 04:27 PM

underh2o2long
Heliman
Location: Derry, NH

Hi Sandy. Did you try to adjusting the 2 pulley arm? You can change the tracking of the belt slightly by turning the arm.

David R.

04-16-2008 04:46 PM

SandyEM16
Heliman
Location: Enid, OK

Thanks DavidR I looked and the pulleys can rotate but not vertically movable. The belt noticeably angled down to the tail gear from the pulleys.. I was hoping there was 2 mm shim laying around. Anyway, now the belt is straight. I have looked at available pics on the forums and I have not seen this.. It seems like the lower main bearing housing is too low..

04-16-2008 05:10 PM

frebou
Key Veteran
Location: Montreal / Canada

Quote
It seems like the lower main bearing housing is too low..

It may sound stupid but are you sure it's the right way up? Could you have inverted a part?

Mine is pretty straight, only alignment required was the Fore/Aft motion of the pulley bar...

BEAM - Beautifully Engineered Action Machine

04-16-2008 06:32 PM

HOMEPAGE

SandyEM16
Heliman
Location: Enid, OK

Okay, I took the gear assembly apart..I became apparent that with the oneway pressed down, the MR106 bearing was too far down the case to allow the flange on the sleeve to rest.. So, pressing the oneway back in a little farther than originally set brought the bearing high enough to rest the sleeve flange on the inner race..I left just enough of the oneway sticking out the case to rest on the inner race of the lower bearing.. Alignment is now okay.. Thanks for the input.. Sandy

04-17-2008 01:49 AM

jongam0
Senior Heliman
Location: ft. wayne, in usa

sandy

if you notice in the instructions the bearings in the mainshaft blocks are different. one is 5mm thick the other is 4mm. the 5mm needs to go on the bottom. this will help your alignment. i made this mistake.

earth ----- my worst hard object

04-21-2008 01:46 AM

SandyEM16
Heliman
Location: Enid, OK

Hummmm, I have looked at those bearings and wondering if I switched them it would be better.. But the manual specifically says that the 5mm 685zz bearing goes in the upper bearing block and the graphic even shows the bearing extending below the block, too.. Is the manual wrong?

Sandy

04-21-2008 03:32 AM

jongam0
Senior Heliman
Location: ft. wayne, in usa

i switched mine around to fix that problem.

earth ----- my worst hard object

04-21-2008 10:08 AM

SandyEM16
Heliman
Location: Enid, OK

I am getting a lot fuzz off the belt.. I will do it.. Thanks

04-21-2008 02:20 PM

SandyEM16
Heliman
Location: Enid, OK

Well I didnt switch the bearings because I dont think I need too.. If you look closely, there is a slight mainshaft to frame forward angle by design..It is more easily seen by looking at the vertical motor alignment..The belt guide pulleys provide just enough angle of the most forward portion of the belt to properly align with the main pulley.. Man, I'm sorry I started this thread..

04-24-2008 01:20 AM

jongam0
Senior Heliman
Location: ft. wayne, in usa

your fuzz is coming from the belt running to high on the gear. when i switched the bearings around the belt runs just barely off the top rim of the gear. yes you are correct on the slight angular off-set of the mainshaft and motor. i think this is because of the low boom mounting on the frame. this would allow clearance for the tailblades.

earth ----- my worst hard object

04-24-2008 01:27 AM

SandyEM16
Heliman
Location: Enid, OK

I would like to see from your experience if the smaller 116 bearing can take the load in the upper block position.. It seems to me there would be a lot more lateral forces up there..

I have not noticed anymore fuzz since the initial breakin and riding a higher on the pulley will not allow the belt to slip off beneath the pulley.. Great discussion..

04-24-2008 03:05 PM

jongam0
Senior Heliman
Location: ft. wayne, in usa

the bearing balls are the same size. the only difference is the width. you still have the same o.d. and i.d. so the balls can not be any different if at all. you actually have more load at the bottom. the top block is more of a pivot point so the main load would be on the bottom bearing.

earth ----- my worst hard object

04-24-2008 09:00 PM

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e-BEAM Beam E4 > Build-- belt to gear issue

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