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**Jamez** · 01-05-2007, 09:27 PM

Sounds like something is missing. Not to familiar with the 450 head, but it sounds like there is a spacer or somthing not in. Looking at a pictur on midland's site the apears to be a metal ring that sits behind the blade grip. thats all I could see that could cause it.

**Kwickkwack** · 01-05-2007, 09:53 PM

Should have kept the ninja - no blade grips needed - just twist right hand

Sorry - couldn't help me self, the voices made me do it

________________
Kwickkwack

**Leebert** · 01-05-2007, 10:07 PM

I guess I deserved that one fair and square

**Kwickkwack** · 01-05-2007, 10:13 PM

I hope you get it all sorted, did you do much damage?

**Sesame** · 01-05-2007, 10:28 PM

IVe had to replace the bearings in the blade grips a couple of times.

You should have 2 sets of bearings in the blade side of each holder, in the back of the holder(nearest the head) you should have another set of bearings, slightly smaller then there should be a spacer/shim not sure what they call it. these then press up against the dampners which are a couple of little rubber rings which sit inside the head.

When I first got the 450(it was second hand) the feathering spindle was a little longer than the standard 40mm one and my head had 2 of these spacers eitherside. but since using the standard 40mm spindle ive gone down to just one spacer.

Hope this helps, as ive taken it apart a few times now getting quite familiar with it

**Leebert** · 02-05-2007, 07:32 AM

Thanks Sesame.
All is back in the correct place according to the manual but I didn't know there was a potential for a longer spindle. I will check tonight. If I am still confused (very likely) I'll take some snaps and post here.

On my rex, with the bearings, shims etc all in place there is actually nothing to stop the blade grip moving back toward the head as the OD of the shim is smaller than the diameter of the end of the blade grip. The blade grip slides over the bearings and then over the shim with the shim now partially occupying the space where the smaller blade grip bearing should be (sorry if that doesn't make sense - it hurt my head just typing it).

When the heli is spooled up I wouldn't have thought it would be a problem as centrifugal force would keep the blade grips out against the bearings.

Rob:
It's not too bad thanks mate. Just the usual shafts, bearings, boom & blades. Luckily Align sell things in packs of 2s or 4s just for me

Apologies for my comment in your magnet thread - if I had known that your day was that bad I wouldn't have posted it.

**Leebert** · 02-05-2007, 05:29 PM

Here are some pics of the head. I don't think the problem is a long feathering shaft as the blade grip appears to have nothing to stop it moving toward the head.

What do you rex owners think??

**Leebert** · 02-05-2007, 08:41 PM

Just checked the feathering spindle - near as makes no odds 40mm.

**Sesame** · 03-05-2007, 09:20 AM

Its very difficult to tell from a picture what a problem could be.

If I describe exactly as best I can how mine is it may give you how it should be.

Starting inside the head(the easy bit) you will have the two dampners no.18 on the attached pic(which is from the handbook) these go inside the head and once in they are vitually level with the side of the entrance to the head. This is what the spindle is slipped through, use a little ptfe greese on this so it moves you only need a very little.

The blade holders inside the blade side you will have the 2 bearings no.14 these slip in easily and do not infringe on the space where the blades sit. On the rear side of the blade holder the final bearing does in no.17 this once in the outside of this bearing lies flush with the back of the blade holder.

If all this is inplace none of these bearings should move inside the blade holder, if they do then I would concider changing the holders.

Between the rear bearing and the dampners is the spacer no.19. when assembling I have had to use slightly longer screws into the end of the spindle, with washers, and then I tighten them up each side equally until all of the play is out of the shaft. and the spacers are pushing up against the dampners, there should be no sideways movment at all.

As a note if you do them up very tight the spacers will push into the head rather than the bladeholders, if they are pushing into the blade holders then again I think you may have a problem with your bladeholders. Also if you do this spindle up too tight then when you hover the heli you will find that you will have a forward rear ocilation, I had this and it took me ages to findout what it was.

When putting the screws in the end of the spindle make sure use use a good threadlock you dont want those babies comming loose

**marktigere1** · 03-05-2007, 09:52 AM

Hi Lee

My 450 XL head has the same small movement towards the head.

All bearings are in place and all washers as per the manual.

Not worried about it myself as the movement is small and when spooled up the grips align (no pun) and the head is very smooth.

Guess this is part of the design?

Or maybe I should worry about it and yet again, take the head apart

Cheers

Mark

PS. The feathering spindle, blade grips and bearings were all newly replaced two months ago and are genuine Align parts.

**Leebert** · 03-05-2007, 12:33 PM

Originally posted by Sesame View Post

...Starting inside the head(the easy bit) you will have the two dampners no.18 on the attached pic(which is from the handbook) these go inside the head and once in they are vitually level with the side of the entrance to the head. This is what the spindle is slipped through, use a little ptfe greese on this so it moves you only need a very little.

The blade holders inside the blade side you will have the 2 bearings no.14 these slip in easily and do not infringe on the space where the blades sit. On the rear side of the blade holder the final bearing does in no.17 this once in the outside of this bearing lies flush with the back of the blade holder.

Yes, my rex head is the same. The only think I can think of is if the shims have been replaced with something of a smaller OD?

Originally posted by Sesame View Post

If all this is in place none of these bearings should move inside the blade holder, if they do then I would concider changing the holders.

If I load the three bearings into the blade grip on the bench I can push on the small bearing on the head side of the grip and move all the bearings out toward the blade end. This is what happens when it's assembled on the heli but I am moving the grip toward the head (as opposed to moving the bearings within th grip toward the blades).
I hope that makse sense

Cheers,

**Leebert** · 03-05-2007, 02:14 PM

D'oh!

I think I may have answered my own question in one of my earlier posts...

Looking at the image from the manual that you posted Sesame, it shows each bearing having a squirt of R48, which, reading the manual appears to be similar to Loctite 641 (bearing fit). I'll add some 641 onto the outside of the bearings and reassemble. I'll see how it is on Friday evening after it's gone off.

Maybe I need to RTFM a bit closer but where would be the fun in that

Thanks,

**Sesame** · 03-05-2007, 03:16 PM

From memory though I am sure there is a ridge between the bearings which stops them moving, maybe I only think this

.

I will add I do have the older blade holders on mine, the all blue ones.

Im intrigued by this now and may have to pull the head apart to find out

**marktigere1** · 03-05-2007, 03:18 PM

I read one of Ashley's build's of the XL on www.trextuning.com when I was rebuilding my XL and he advocates NOT to loctite the bearings into the blade grips.

Cheers

Mark

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