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HomeAircraftHelicopterAlignT-REX 700N › 700 Exploded today/POLL how many have had this happen??
01-22-2010 02:41 PM  8 years agoPost 281
jschenck

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La Vista, NE.

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Thumper - can you measure the length of the bolt shoulder and the depth of the recess inside the spindle?

Still looks like the theory of an appropriate washer on the bolt would work. Sure would be nice if the Align engineers would verify this and publish the results.

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01-22-2010 06:13 PM  8 years agoPost 282
Thumpernator

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Senoia, Georgia, USA

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JS,

Trying to measure it, but it's tough to get a consistant reading with the caliper I have. It's evident that the shoulder is bottoming out before the screw head contacts the shaft. It's not by much,,,,, but it is.

I just finished installing mine (again) with the JB Weld filler and the new cap screws and washers from the hardware store. Flying tomorrow if the weather cooperates.

Dave
I keep on thinking, but nothing's happening. Knuk, Knuk, Knuk

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01-22-2010 09:47 PM  8 years agoPost 283
stuartmp74

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Gold Coast, Australia

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I know about the chamfered end. But this is not the case. There is a noticable gap that you can slide a business card into. You can really see it easily under a magnifier light.
Maybe your bolt has the problem and mine does not I tried to fit a 0.01mm feeler gauge between the Head of the Collar screw and then end of the Spindle shaft with no luck.

IMO there is no gap with the bolt I have.

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01-23-2010 03:07 AM  8 years agoPost 284
hanzuki

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London, Ontario-canada

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Perhaps thats the difference between a bolt that breaks and one that doesnt. I have a brand new spindle with bolts, and one of the bolts sits flat, the other has a noticeable gap on one side of the head. Its clearly crooked.

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01-23-2010 03:21 AM  8 years agoPost 285
PC12DRVR

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USA

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Hanzuki thank you but I think we reached that conclusion a long time ago, these bolts are poorly made.

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01-23-2010 03:42 AM  8 years agoPost 286
flustercluck

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Newnan Ga (Just S. of ATL)

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Flying tomorrow if the weather cooperates.
I'm bringing a helmet & full body armor

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01-25-2010 11:06 AM  8 years agoPost 287
stuartmp74

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Gold Coast, Australia

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Interesting New Information
While waiting for my 700 LE kit to arrive I went down to my local hobby store and purchased a spindle shaft kit, which comprised of two spindle shafts and two Collared Socket head cap screws.

I inspected them and gave my opinions about them in previous posts.

My 700 LE kit arrived today and the first thing I did was check the spindle shaft and Collared Socket head cap screws.

To my surprise they where different. The ones in my 700 LE kit where very course as if the thread was binding. I was still able to turn them by hand they just felt not as smooth as my first set even though they where covered in machining oil.

The second thing I noticed was that the head was not concentric.
I measured about 0.45mm out of concentrically or out of round.

The third thing I noticed was that this bolt to did not pull down square and was kicked over to one side.

The last thing I noticed was the thickness of the flange on the head.
The bolt with the thinner flange on the head is the good one and the one with the thicker flange on the Head IMO is a faulty one.

So I have taken some pictures of both bolts.

Can the other pilots with the broken spindle shaft collared Socket head cap screws confirm which type they had that broke.

Maybe we can all come to a consistence which bolt is at fault and hence gain some confidence in out Heli once again.

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01-25-2010 01:42 PM  8 years agoPost 288
natew

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Brattleboro,VT USA

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All I have to say about those pics is WOW! how the hell does that happen? what happened to QC?

Trex 700, Trex 500, Trex 450 Pro

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01-25-2010 02:49 PM  8 years agoPost 289
classic

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All over the place!

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I am sure if your willing to pay the shipping both ways and wait at least six weeks, align will replace the bolts with two matching bolts!

Which is worse, ignorance or apathy? I don't know and I don't care!

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01-25-2010 03:04 PM  8 years agoPost 290
jschenck

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La Vista, NE.

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I appreciate everyone who is submitting their findings to this, giving me a bit more confidence on what to look for and more importantly to fly it. As soon as my Predator and Vision Competition are off my bench my 700 will get some winter maintenance. First thing I will do is pull my spindle off and check bolt fit- and replace the dampers. Also going to reline the clutch bell (should have done that when building it) and replace all the fuel lines. I will also replace all the ball links with the -1 Align links.

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01-25-2010 03:14 PM  8 years agoPost 291
CoronaL

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Winnebago IL

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I found a fix for my 2nd 700
I got a 2nd Kasama head lol.

Man I wish we could get to the bottom of this so nobody else would risk crashing due to a bad bolt, but more importantly. So there isn't the risk that someone could be hurt/killed by a flying blade

Randy!!! I am the liquor

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01-25-2010 04:06 PM  8 years agoPost 292
stuartmp74

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Gold Coast, Australia

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Like I said hopefully the people who have experienced a failure can confirm with bolt the were using.

PC12DRVR & eperez74 are ones that have sent photos so the should be able to tell use what bolt they have.

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01-25-2010 06:47 PM  8 years agoPost 293
da_man

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Central NC

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I started flying mine with 2000rpm.

All I did was find a a m6x16 capscrew with a 12.9 marking. I also used a 1/4 hardened washer and a m6 washer on top of that (m6 on the head). Thats all you need.

As an engineer that has to design mechanical systems, I would say the following.

As far as the open space goes, its only clearance. If align designed that to be functional your spindles and bolts would cost 5$ more. The bolts are not even close to being accurate enough, and neither is the spindle. If the bolts were made for that functionality, then they would look more like a shoulder bolt and you would see a metallic color on their shoulder. This would indicate that they were ground.

the design intent is for the bearings to locate on the spindle. The head of the screw locates the inner race at the end of the spindle and keep it in place. The problem is that the bolt wasn't strong enough to keep the bearing in place.

But if anyone feels safer adding something in that space, then go ahead, you won't hurt anything.

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01-25-2010 08:15 PM  8 years agoPost 294
jpla010

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Auckland, New Zealand

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Hey stuartmp74

just to confirm, this is the bolt that came with your LE kit?

Jonathon

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01-25-2010 09:05 PM  8 years agoPost 295
stuartmp74

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Gold Coast, Australia

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Yip that's the one.

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01-25-2010 09:52 PM  8 years agoPost 296
hanzuki

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London, Ontario-canada

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Bolts
After much reading, research and discussion with an engineer this is what I will be using;

Its a 12.9 M6x20 with a flat washer of the same diameter of the head of the original bolt. I have a post on the 'other' site with some of my research.

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01-25-2010 09:58 PM  8 years agoPost 297
philip 01

rrElite Veteran

ft worth

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the bolt above is the traditional bolt/head used on most heli's i've seen and had.

what align uses looks more like a button screw head on the 700.

unusual to me.

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01-25-2010 10:10 PM  8 years agoPost 298
stuartmp74

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Gold Coast, Australia

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Here are some more pictures of the defective screw.

You can clearly see the gap due to the screw head being out of square to the axis of the thread.

I was able to fit a 0.152mm Feeler gauge in the gap.

This would cause bending stress on the bolt.

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01-25-2010 11:06 PM  8 years agoPost 299
philip 01

rrElite Veteran

ft worth

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wow. not good.

if these were full scale helis an AD would be issued to change hardware right now before further flight.

go with a socket cap hex head bolt and a flat washer. (not a button head)

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01-25-2010 11:51 PM  8 years agoPost 300
lfalsetto

rrKey Veteran

COLORADO

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Stuartmp
What about if you milled the bolt to eliminate the gap? What I mean is shave the length off so it will seat.

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