The Malediction of the Neddle roller from Outer Space...

[Francis Chartier]

Firts, my apologies for the rusty english, schooldays are long gone and technical english is pretty hard for me.

 

At 50.000 km, I found the right side external needle bearing shot, with a damaged internal race.

How strange...

 

Parts 30, 31 and 33 on the drawing of the parts list:

http://www.bete-des-vosges.org/Visible/V11...Eclate_Pont.pdf

 

I am not going to rant about this needle bearing, the subject has been already discussed at length here.

As the same causes produce the same effects, I decided to find an other solution than simply replace this bearing.

Time will tell if it is a clever and *better* solution or just a complicated way to butcher a bevel box.

 

After some thoughts and wine with a mate, we decide to use a cheap and readily available composite sliding bushing designed to withstand important efforts.

We choose a Composite Dry Sliding Bushing, ref. PCM 252815 M in the SKF catalog.

Then, we designed the parts that will hold this bushing and the wheel axle in the bevel box.

 

Finally:

http://www.bete-des-vosges.org/Visible/V11...nt/ENSEMBLE.pdf is a global drawing of the 2 parts + the bushing

 

More details in http://www.bete-des-vosges.org/Visible/V11...0EXTERIEURE.pdf

for the external race that will be pressed in the bevel box, replacing part 30 of the part list

 

http://www.bete-des-vosges.org/Visible/V11...0INTERIEURE.pdf for the internal race (part 31 of the part list).

 

The two parts are milled from XC48 steel, the internal one is then tempered (quenched?) to gain resilience (HRC > 50) for the sliding bushing.

 

OK, I hear some snoring from the back of the classroom, enough for the whiteboard, let's go and grease our elbows...

 

It was not too early to do the job...

The needle bearing was shot, it was a nightmare to get it out of the bevel box:

http://www.bete-des-vosges.org/Visible/V11...n_roulement.jpg

http://www.bete-des-vosges.org/Visible/V11...Pont/bagues.jpg (lower left for the old inner race)

 

I then fit the bushing in the outer race.

As I do not have a press I use the classical method of heating the outer race while putting the bushing in the freezer.

A trace of grease on the bushing, an anvil, a flat metal piece and a big hammer later, it is done:

http://www.bete-des-vosges.org/Visible/V11...s+coussinet.jpg

 

A few minutes of heating later, it was fitted in the bevel box.

http://www.bete-des-vosges.org/Visible/V11...Pont/final1.jpg

http://www.bete-des-vosges.org/Visible/V11...Pont/final2.jpg

http://www.bete-des-vosges.org/Visible/V11...Pont/final3.jpg

 

Job done.

 

A soon as some other modifications are done (fix broken oil cooler bracket, fit brakes on new fork),

I will get new tyres (Pirelli Diablo) and will thoroughly test it on the roads.

 

Stay tuned...

[luhbo]

Nicely done.

 

What do you think about just milling a Hostaform/Delrin bushing to replace the worn needles/cage. That's what I have in mind for one day still to come.

 

This bearing is not sealed, your replacement is not sealed also. There will quite quickly get water and sand inside and start it's abrasive and corossive work. A softer material might withstand this erossion better.

 

Hubert

[Paul Minnaert]

nice work.

 

Luhbo, the bearing is sealed. A tiny seal, but it is sealed.

[luhbo]

Oh, is it? If so I wouldn't know if it's a good thing or not. Sealed should be sealed, not only a little sealed. This bearing on my bike was rotten by water, dust, and a good mouthfull of cleaning fluid every now and then.

Otherwise the bearing would last for ever. There are no real forces on it.

 

Hubert

[Dan M]

Very nice work.

[Paul Minnaert]

Oh, is it? If so I wouldn't know if it's a good thing or not. Sealed should be sealed, not only a little sealed. This bearing on my bike was rotten by water, dust, and a good mouthfull of cleaning fluid every now and then.

Otherwise the bearing would last for ever. There are no real forces on it.

 

Hubert

Yes sealed, but the original inner ring has a hole in it, so there the water and dust can come in too.

[Francis Chartier]

Yes sealed, but the original inner ring has a hole in it, so there the water and dust can come in too.

Mine had no hole, same result.

Every rear tyre change I tried to clean it the best I could before using clean grease but it died nonetheless.

 

I think that the best solution would be to find a sealed bearing (6xxx type, like those for the wheels), but we could not find any with the correct size.

[emry]

Excellent redesign. Your English is better than mine, and that is all I have ever known.

[savagehenry]

Hey F.C.

I can't see it being any worse than what you had, and you obviously can always change/fix'er if it doesn't. A very well documented post, looking forward to more like it. One of the most detailed in my memory here ( +2). NOW, don't be surprised if this thread goes OVER 40 EFFIN' PAGES!!! (...God, you guys NEED Spring...) S.H.

[Francis Chartier]

NOW, don't be surprised if this thread goes OVER 40 EFFIN' PAGES!!! (...God, you guys NEED Spring...) S.H.

 

Hum...

 

I do a lot of spannering to my bikes mainly because I like that very much, I like solving problems and working with tools.

I can be wrong, it would not be the first or last time, I'll gladly accept constructive critics or suggestions (a good way to improve knowledge) but I don't have any time to lose with those who can bore you to death with idle speculations and bickering.

 

Anyway after all is said, we're just a group of fun loving reasonable guys, I really cannot see how this thread could go over 40 pages.

[raz]

I really cannot see how this thread could go over 40 pages.

Noone could have guess that about the temp sensor thread either

 

Anyway, solid work. I'm looking forward to a 10,000 km report.