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LG mounting frame

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fklein(at)orcasonline.com
Guest

Posted: Sat Nov 24, 2007 9:08 am Post subject: LG mounting frame

Gentle Monowheelies,

In the midst of Chapter 21 M, last evening I got myself in a bit of a 

jamb by the ever so slightest deviation from the build manual w/ regard 

to the mounting of the LG01A bushes in the large diameter tube of the 

LG mounting frame. Having become accustomed to press fitting and 

loctiting the smaller bushes, I didn't hesitate to loctite the first of 

the two LG01A bushes by gently tapping it in place with a rubber mallet 

after a minimal scouring of the tube and the requisite cleaning and 

degreasing...but lo and behold, I was surprised to find that the shaft 

LG09 no longer rotates freely within the bushing; rather, the shaft has 

but a very tight interference fit within the bushing.



So.....what to do?



I see my options to be (1) to hone the bushing carefully til the shaft 

freely rotates, or (2) heat up the frame and bush to break the loctite 

bond, remove the bush, and scour/sand the inner circumference of the 

tube until the bush slides in neatly and then re-loctite.



Have any of you had to deal with this problem?... if so, how did you 

solve it?



Any comments would be much appreciated.



Fred

A194

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rlborger(at)mac.com
Guest

Posted: Sat Nov 24, 2007 10:10 am Post subject: LG mounting frame

Fred,

Went back to read Chapter 21M to refresh myself on the operation.  From my understanding of your installation, you tapped the LG01A bushings into place without the LG09 to maintain alignment.  It's a tough call, but I'd guess you'd be best to remove the two LG01A bushings, clean it all up and re-bond as per instructions with the LG09 in place.  That best ensures that the bushings are aligned properly with the shaft.



Just my 2¢ and probably not worth all that.



Good building and great flying,

Bob Borger

Europa Kit #A221 N914XL, XS Mono, Intercooled 914, Airmaster C/S

http://www.europaowners.org/N914XL

(90%) tail kit done, wings closed, cockpit module installed, pitch system in, landing gear frame in, rudder system in, outrigger mod in, Fuselage Top on, lift/drag/flap pins in, wing incidence set, tie bar in, flap drive in, Mod 70 done.  Baggage bay in.  Flaps & Main Gear complete.  Mod 72 complete.  Instrument panel complete, except for testing.  Rotax 914 installed (for the 3rd time).  Airmaster Prop installed.  Electrical complete, except for testing.  Fuel system complete except for testing.  Working in - 32 Tail, 34 Door Latches & 35 Doors, 37 Interior & Finishing.  Airmaster arrived 29 Sep 05.  Seat arrived from Oregon Aero.  E04 interior kit has arrived and is being installed. 

3705 Lynchburg Dr.

Corinth, TX  76208

Home:  940-497-2123

Cel:  817-992-1117





On Nov 24, 2007, at 11:06 AM, Fred Klein wrote:

 	  Quote: 	
		  --> Europa-List message posted by: Fred Klein <fklein(at)orcasonline.com (fklein(at)orcasonline.com)>

Gentle Monowheelies,





In the midst of Chapter 21 M, last evening I got myself in a bit of a jamb by the ever so slightest deviation from the build manual w/ regard to the mounting of the LG01A bushes in the large diameter tube of the LG mounting frame. Having become accustomed to press fitting and loctiting the smaller bushes, I didn't hesitate to loctite the first of the two LG01A bushes by gently tapping it in place with a rubber mallet after a minimal scouring of the tube and the requisite cleaning and degreasing...but lo and behold, I was surprised to find that the shaft LG09 no longer rotates freely within the bushing; rather, the shaft has but a very tight interference fit within the bushing.

So.....what to do?

I see my options to be (1) to hone the bushing carefully til the shaft freely rotates, or (2) heat up the frame and bush to break the loctite bond, remove the bush, and scour/sand the inner circumference of the tube until the bush slides in neatly and then re-loctite.

Have any of you had to deal with this problem?... if so, how did you solve it?

Any comments would be much appreciated.

Fred

A194

	




 



 



 [quote][b]

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fklein(at)orcasonline.com
Guest

Posted: Sat Nov 24, 2007 11:15 am Post subject: LG mounting frame

On Saturday, Nov 24, 2007, at 10:08 US/Pacific, rlborger wrote:

 	  Quote: 	
		    From my understanding of your installation, you tapped the LG01A 

 bushings into place without the LG09 to maintain alignment.  It's a 

 tough call, but I'd guess you'd be best to remove the two LG01A 

 bushings, clean it all up and re-bond as per instructions with the 

 LG09 in place.  That best ensures that the bushings are aligned 

 properly with the shaft.


	


Bob,



Thanks for your comment and for taking the time to go back thru the 

manual. Your understanding is correct except that I have only loctited 

one of the LG01A bushes.  I don't believe I have an alignment 

problem...I think my problem results from the bush being compressed 

just enough to make for an interference fit between bushing and shaft 

rather than for the shaft to freely rotate.



Looking at the Loctite specs, I find that the bond dissolves at 250 

degrees C (wow...that's 482 degrees F.!). I guess I can put a propane 

torch into the LG mounting frame and heat the puppy up to free the 

bushing...but am wondering what that will do to the powder 

coat...(?)...and I don't want to exacerbate the situation.



While still pondering what to do, I'm certainly open to additional 

counsel from any source!



Thanks,



Fred

A194



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rlborger(at)mac.com
Guest

Posted: Sat Nov 24, 2007 1:02 pm Post subject: LG mounting frame

Fred,

OK, I understand the issue.  I really don't have a good recommendation.  Only can say that you need the LG09 to fit snugly in the LG01A bushing with no slop allowed.  The over-center is tenuous enough as it is.  Any slop at all certainly would aggravate any problems there.



Perhaps someone out there with more machine shop experience can come up with a better solution or a means to lap the bushing to size while maintaining proper alignment.



Good luck,

Bob

On Nov 24, 2007, at 1:13 PM, Fred Klein wrote:

[quote]



On Saturday, Nov 24, 2007, at 10:08 US/Pacific, rlborger wrote:

  	  Quote: 	
		   From my understanding of your installation, you tapped the LG01A bushings into place without the LG09 to maintain alignment.  It's a tough call, but I'd guess you'd be best to remove the two LG01A bushings, clean it all up and re-bond as per instructions with the LG09 in place.  That best ensures that the bushings are aligned properly with the shaft.

 	




Bob,

Thanks for your comment and for taking the time to go back thru the manual. Your understanding is correct except that I have only loctited one of the LG01A bushes.  I don't believe I have an alignment problem...I think my problem results from the bush being compressed just enough to make for an interference fit between bushing and shaft rather than for the shaft to freely rotate.

Looking at the Loctite specs, I find that the bond dissolves at 250 degrees C (wow...that's 482 degrees F.!). I guess I can put a propane torch into the LG mounting frame and heat the puppy up to free the bushing...but am wondering what that will do to the powder coat...(?)...and I don't want to exacerbate the situation. 

While still pondering what to do, I'm certainly open to additional counsel from any source!

Thanks,

Fred

A194

[b]

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grahamsingleton(at)btinte
Guest

Posted: Sat Nov 24, 2007 1:13 pm Post subject: LG mounting frame

Fred

if you can find a lump of round bar the right size to slip into the 

bush, heat that to around 300C, wait a couple of minutes, then tap the 

bush out with another lump of bar (same OD as the bush)

That should do it without overheating the powder coating.

The expansion of the bush will tighten it until the LG heats up a bit 

too then it should loosen.

Get a second opinion about this!

When you get it out you need to find out why the bust went tight!?

Can't have been the loctite. The proper thing to do would be to ream the 

bush with a long hand reamer. Can you rent an expanding reamer long 

enough? They may exist.



Graham



Fred Klein wrote:

 	  Quote: 	
		   

 

 On Saturday, Nov 24, 2007, at 10:08 US/Pacific, rlborger wrote:

 

      From my understanding of your installation, you tapped the LG01A

     bushings into place without the LG09 to maintain alignment.  It's a

     tough call, but I'd guess you'd be best to remove the two LG01A

     bushings, clean it all up and re-bond as per instructions with the

     LG09 in place.  That best ensures that the bushings are aligned

     properly with the shaft.

 

 

 Bob,

 

 Thanks for your comment and for taking the time to go back thru the 

 manual. Your understanding is correct except that I have only loctited 

 one of the LG01A bushes. I don't believe I have an alignment problem...I 

 think my problem results from the bush being compressed just enough to 

 make for an interference fit between bushing and shaft rather than for 

 the shaft to freely rotate.

 

 Looking at the Loctite specs, I find that the bond dissolves at 250 

 degrees C (wow...that's 482 degrees F.!). I guess I can put a propane 

 torch into the LG mounting frame and heat the puppy up to free the 

 bushing...but am wondering what that will do to the powder 

 coat...(?)...and I don't want to exacerbate the situation.

 

 While still pondering what to do, I'm certainly open to additional 

 counsel from any source!

 

 Thanks,

 

 Fred

 A194

 

 

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-- 

Graham Singleton



Tel: +441629820187

Mob: +447739582005

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fklein(at)orcasonline.com
Guest

Posted: Sat Nov 24, 2007 3:24 pm Post subject: LG mounting frame

Thanks Graham and Bob for your thoughts. I'm quite mindful of the need 

for a close tolerance fit of the shaft within the bushings, hence my 

query and head-scratching. I believe the bush "went tight" because of 

my failure to scour out the powder coat overspray from the interior of 

the LG frame tube; when I tapped the bushing in place w/ a rubber 

mallet it compressed just a tad but enough to keep the shaft from 

rotating freely.  I believe I've solved my problem satisfactorily as 

follows:



I mentioned that I'd only loctited one of the bushes. In order to not 

repeat my problem, I happened to have an 80 grit flap wheel for my 

Dremel which was about 1/8" dia. smaller than the tube, and I used it 

to hone the interior of the tube, removing all overspray from the 

powder coating and brightened it up. This allowed the second bush 

(which turned freely...while mounted on the shaft) to slide 

effortlessly into the LG frame tube.



After taking another look at the bush which had been previously 

loctited in the tube, I used the flap wheel to lightly hone or dress 

(not sure of the proper term here) the inside surface of the 

bush...after several iterations (including sequential greasing and 

degreasing w/ solvent), this seemed to be doing the trick. The shaft 

now rotates freely without slop, and I've now loctited the second bush 

in place.



Onward and upward,



Fred

A194



On Saturday, Nov 24, 2007, at 13:12 US/Pacific, Graham Singleton wrote:



 	  Quote: 	
		   When you get it out you need to find out why the bust went tight!?


	




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grahamsingleton(at)btinte
Guest

Posted: Sat Nov 24, 2007 4:39 pm Post subject: LG mounting frame

glad you're out of trouble Fred!

Graham



Fred Klein wrote:

 	  Quote: 	
		   

 

 Thanks Graham and Bob for your thoughts. I'm quite mindful of the need 

 for a close tolerance fit of the shaft within the bushings, hence my 

 query and head-scratching.

- The Matronics Europa-List Email Forum -

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r.collings(at)onetel.net
Guest

Posted: Sat Dec 01, 2007 4:52 am Post subject: LG mounting frame

Hi, relax you have in effect shrunk the bush into the hole and made a good 

engineering fit. What you need to do now is ream out the bush to the size of 

the shaft that fits it. If you don't have a reamer that size use a drill bit 

that mics up to the correct size. Don't use a power drill just a hand tee 

bar.To check the drill size is correct do a trial on a piece of aluminium 

first.

---

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