RunRyder RC
WATCH
 1 page 2442 views POST REPLY
HomeAircraftHelicopter
e-
Align
T-REX 500 › Main shaft slop
02-05-2010 04:40 AM  8 years agoPost 1
vinrx7

rrVeteran

Americas finest city

My Posts: All  Forum  Topic

Just Finished building my 500 ESP and trying to get it dialed in. Just flew 1 pack and I noticed that there is a little bit of slop
in the main shaft. No
up and down movement but if I push front and back on the button head, I can sense some movement. Should I be concerned? Pissed me off as I just put this dang thing together.

STUPID TREE!!!

PM  EMAIL  GALLERY  Attn:RR  Quote
02-05-2010 12:30 PM  8 years agoPost 2
Evan D

rrApprentice

Charlotte, NC

My Posts: All  Forum  Topic

I don't have that on my 500ESP but I did on the 600ESP. The main shaft moved around in the main bearings. I put a drop of the green loctite on each and there's no play now.

PM  EMAIL  GALLERY  Attn:RR  Quote
02-05-2010 04:27 PM  8 years agoPost 3
mmc205

rrElite Veteran

PA - USA

My Posts: All  Forum  Topic

if you push high enough and hard enough, all helis will have some movement. push the main shaft close to the bearings, if you see any noticeable problem, you may have a bad shaft or a bad bearing. Otherwise i wouldn't worry about it.

***Logo 600 vbar***Henseleit TDR vbar***

PM  EMAIL  GALLERY  Attn:RR  Quote
02-05-2010 11:29 PM  8 years agoPost 4
v58 fuy

rrVeteran

UK - Kent

My Posts: All  Forum  Topic

Not all heli's have play in the main shaft as you describe, but I have found most Aligns do.

My 500 had the play you talk about, until I changed to the KDE main bearing blocks with thrust bearings - no more play at all.

David

PM  EMAIL  GALLERY  Attn:RR  Quote
02-05-2010 11:49 PM  8 years agoPost 5
jones007

rrApprentice

Monterey, CA - USA

My Posts: All  Forum  Topic

As previously mentioned, most Aligns have undersized mainshafts, and have some slop like this. I think the 600ESP has the most, and has been a really hot topic on some forums. The amount of slop will change with each mainshaft that you get. I swapped out the mainshaft bearings (don't really need to swap the blocks - the blocks aren't the cause of the slop) for ceramic hybrids, and this got rid of most of it on the 500. It helped on the 600ESP as well, but not as much.

While this sort of slop is annoying for those of us with OCD, it doesn't really effect the swash links, so you won't see spurious control issues from it. It generally has a small effect on gear mesh, as it allows the main gear to move forward/aft slightly. With very powerful motors this can be a bit of a problem, as you have to leave the mesh looser than you would like to account for the gear moving forward, but this allows for a looser mesh than you would like when the gear moves back.

All the bearings that Align uses are pretty low tolerance, so IMHO the best option is to swap the main shaft bearings for ceramics. I usually do this on the counter shaft and tail shaft as well as a preventative measure.

--Kevin

Trex 700N, Trex 600ESP, Trex 500, Trex 450Pro

PM  EMAIL  Attn:RR  Quote
02-08-2010 05:27 AM  8 years agoPost 6
BobOD

rrElite Veteran

New York- USA

My Posts: All  Forum  Topic

A loose fit of the main shaft in the bearings will cause vibrations. Most don't seem to notice it but the biggest issue I find with it is the affect on the gyro (or gyros if you're flybarless).
The 600 is the worst by far. It's because they are putting that "special" coating on the swash ball but it seems they didn't account for coating thickness when they sized the hole....so they just reduced the shaft to fit...not accounting for the bearings which don't have this coating. OOOPS.

Team POP Secret

PM  EMAIL  GALLERY  Attn:RR  Quote
02-08-2010 08:36 AM  8 years agoPost 7
Spitfire1

rrElite Veteran

Perth Australia

My Posts: All  Forum  Topic

My 500 was the same after first flight, replaced bearings but it was just the same in about 2 flights, I dont worry about it anymore and just fly.

PM  EMAIL  GALLERY  Attn:RR  Quote
02-08-2010 08:45 AM  8 years agoPost 8
v58 fuy

rrVeteran

UK - Kent

My Posts: All  Forum  Topic

Normally I won't fit bling to my heli's unless the items really makes a difference.

In the case of the KDE main bearing blocks, a friend recommended them to me, saying that they elliminated the slop and made his bearings last longer - so I have fitted them to see for myself.

So far can't comment on bearing life, but the slop has definitely gone - which I guess can only be a good thing.

David

PM  EMAIL  GALLERY  Attn:RR  Quote
02-11-2010 03:08 AM  8 years agoPost 9
vinrx7

rrVeteran

Americas finest city

My Posts: All  Forum  Topic

That's for the input. I decided to just leave it the way it is and worry about it after a crash.

STUPID TREE!!!

PM  EMAIL  GALLERY  Attn:RR  Quote
02-11-2010 03:54 AM  8 years agoPost 10
outhouse

rrVeteran

auburn ca

My Posts: All  Forum  Topic

mine had it new out of the box and it flew great.

I added microheli junk bearing blocks with thrust washers and the slop was still there and in less then a year there was more then stock.

I now fly the align alloy blocks with abec 3 bearinsg and theres still mainshaft play but it flys like a dream so who cares

PM  EMAIL  Attn:RR  Quote
02-11-2010 05:21 AM  8 years agoPost 11
BobOD

rrElite Veteran

New York- USA

My Posts: All  Forum  Topic

I'm just finishing up making some shafts that have a nice tight fit in the bearings and has a slightly smaller diameter in the upper portion of the shaft for a good sliding fit for the swash.
I haven't flown it yet but it feels so much better. I'll report once I get it in the air.

Actually, the 600 is much worse than the 500. I'll be doing the same for that one next.

Team POP Secret

PM  EMAIL  GALLERY  Attn:RR  Quote
WATCH
 1 page 2442 views POST REPLY
HomeAircraftHelicopter
e-
Align
T-REX 500 › Main shaft slop
 Print TOPIC  Make Suggestion 

 6  Topic Subscribe

Monday, September 24 - 4:35 am - Copyright © 2000-2018 RunRyder   EMAILEnable Cookies

The RC discussion world needs to consolidate. RR is now one choice for that. Its software is cutting edge. It hosts on-topic advertising. Help RR increase traffic buy making suggestions, posting in RR's new areas (sites) and by spreading the word.

The RunRyder Difference

• Category system to allow Rep/Vendor postings.
• Classifieds with sold (hidden) category.
• Classifieds with separate view new.
• Answer PMs offsite via email reply.
• Member gallery photos with advanced scripting.
• Gallery photo viewer integrated into postings.
• Highly refined search with advanced back end.
• Hosts its own high end fast response servers.
• Hosts thousands of HD event coverage videos.
• Rewrote entire code base with latest technology.
• No off-topic (annoying) click bait advertising.
Login Here
 New Subscriptions 
 Buddies Online