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Other › Microheli front shaft gear and pulley set in Heliup frame?
10-11-2005 03:54 AM  12 years agoPost 1
gwk

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Denver, CO

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Has anyone used the Microheli front shaft gear and pulley set in a Heliup frame? I installed the set in mine and it feels notchy like something is binding when I spin it by hand. (by itself...no other gears installed in frame) Any ideas?

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10-12-2005 02:37 AM  12 years agoPost 2
Nigel Brown

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Perth, Australia

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Hi,

I currently have the gear and shaft in a MicroHeli frame with great success. Is there any chance that the frame could be preloading the bearings, to give it that notchy feeling. Try losening the lower bearing block to see if the shaft will then fun smooth. If this fixes it a little losen both bearing blocks and seperating them a little so the bearings can run free.

Hope this helps a little

Cheers

Nigel

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10-12-2005 03:47 AM  12 years agoPost 3
MikeInMobile

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Mobile, Alabama

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Its the crap bearings that they include (no, the bearings are NOT ABEC grade 5). I got some ceramic hybrids for mine (I run a very high headspeed) and they run like glass.

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10-12-2005 04:22 AM  12 years agoPost 4
gwk

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Denver, CO

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Thanks....I was thinking it was the bearings also. The upper bearing felt notchy even before I installed the bearing blocks in the frame. There is at least one flat spot when you spin the thing by hand. I'll try some other bearings.

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10-13-2005 04:28 AM  12 years agoPost 5
gwk

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Denver, CO

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The Microheli bearings are indeed crap. Now I've got to find some replacements somewhere.......

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10-16-2005 12:23 AM  12 years agoPost 6
dgoss

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Los Angeles, CA

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odd
It seems odd to me that they would put less than top quality bearings in an upgrade part. I'm glad I read this, I was doing a bit of searching as I'm interested in this part possibly. It's good to know that the bearings they include are not great.

MikeInMobile, do you have an online source for the bearings you used? Anyone have a great bearing resource that does online orders?

Thanks!
d.

PS - just found these guys via google - Boca Bearings (http://www.bocabearings.com) - anyone here order from them before?

PSS - okay, I'm sure someone has used these guys - they have T-Rex replacement bearing kits pre-made, one is $70 and one is $120. Interesting (and expensive).

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10-16-2005 12:36 AM  12 years agoPost 7
MikeInMobile

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Mobile, Alabama

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The bearings are 3mm ID /8mm OD / 3mm Thickness. I used ceramic hybrids to replace mine. I ordered item #YCHB83-ZZ from Boca bearings (the kit has 4 of the bearings .... I used the other two for the tail). These bearings are TOP quality and the kit is about $24 (ceramic hybrids are expensive, but worth the difference since they have a top RPM of 90,000 RPM as apposed to 20,000 for standard bearings).

Microheli is going to change the bearings that they use for all of their parts (according to Andy from Microheli). They will be switching to the stainless shielded bearings, but I don't know when this will begin. I am an avid user of ceramic hybrid bearings since they are incapable of generating any type of interference (no metal-metal contact).

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10-16-2005 12:46 AM  12 years agoPost 8
dgoss

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Los Angeles, CA

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thank you
MikeInMobile - thanks for the fast response and all the info., it's much appreciated. Are you also using ceramics for the main shaft or elsewhere?

d.

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10-16-2005 12:54 AM  12 years agoPost 9
MikeInMobile

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Mobile, Alabama

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Ceramic hybrids are not really required for the main shaft (this componennt can NEVER even get close to the max speed referenced for standard bearings), but I have upgraded these bearings to grade 5 bearings from Boca. The main shaft bearings are 5mmID, 11mm OD, 5mm Thickness. The Boca number for bearings that I am using is #SMR685C-YZZ #5 NB2 ($9.95 each). These bearings are much better than the stock bearings. My biggest concern was the tail componennts since they operate at speeds above the 20,000 RPM cap whenever the headspeed is increased (my headspeed is currently 3200 RPM). Modefos has an upgraded bearing set that works pretty well (a lot better than the stock bearings, but not grade 5). The reason for grade 5 bearings for the main shaft is that the grade 5 bearings have virtually no lateral endplay and virtually no radial endplay. This helps to eliminate most of the head vibration during spool-up and spool-down.

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10-16-2005 09:12 PM  12 years agoPost 10
Rickenbacker

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Örebro, Närke - Sweden

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How does this front tail shaft fit into the Align CF frame? And are the bearings hard to replace? I've been thinking about replacing that part since my front pulley literally exploded on me yesterday, luckily on the ground.

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10-16-2005 09:28 PM  12 years agoPost 11
MikeInMobile

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Mobile, Alabama

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The bearings have the same OD and spacing as the stock unit ..... they should fit exactly like the standard unit.

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10-17-2005 08:14 AM  12 years agoPost 12
Andyn_uH

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Calgary, AB, Canada

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Hi all,

Please check if there is too much stress put on bearings, we use the same bearings for the front shaft and the tail gear case.
If you use the front shaft on our frame, you can try to adjust the height of lower bearing case till the shaft can not move up and down, but allow it to spin smoothly.

However, to meet our customers sactisfaction, we changed from opened bearing to shielded bearing to ensure high quality parts you can get, and yet, better protection, longer lasting and maintainance free.

Thanks for your great information and supports,

Andy Nguyen,
Microheli.com

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10-17-2005 12:17 PM  12 years agoPost 13
gwk

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Denver, CO

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However, to meet our customers sactisfaction, we changed from opened bearing to shielded bearing to ensure high quality parts you can get, and yet, better protection, longer lasting and maintainance free.
Too late Andy. It should have been done in the beginning. In your ads (pictures) for the gear the bearings are depicted as a closed design. (before I bought mine) The bearings that I got in my front shaft gear and pulley set were cheap and of the open design. In fact one of them had a flat spot in it.

I thought this was supposed to be "The New MicroHeli". It's stuff like this that turns people away from your products. This is not the first time for me.....

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10-20-2005 05:32 AM  12 years agoPost 14
gwk

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Denver, CO

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Changed out the MicroHeli stock bearings with those from Boca Bearing. MicroHeli forward tail drive gear is now silky smooth. Thanks MikeInMobile for the info on how to fix it!

Oh....and thanks for nothing "The New MicroHeli".

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10-20-2005 05:53 AM  12 years agoPost 15
dgoss

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Los Angeles, CA

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Ordered my bearings yesterday. Picked up four for the MH shaft and tail shaft. While I was ordering I picked up a pair of the ones for the main shaft too. Looking forward to it, thanks for the tip Mike.

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