Needle roller bearings

[royboycv]

Right here goes ,i have some pics  (i hope) of the mod on the rear swinging arm of an XP-X frame or an 856 .

http://imageshack.us/a/img6/2263/photo0275j.jpg
http://imageshack.us/a/img213/1650/photo0274u.jpg

 This is the finished job ,with NO mods to frame or swinging arm.

(LET MEKNOW IF THE LINK WORKS ,FIRST TIME I HAVE DONE THIS )

If it has worked ,i will rambel on a lot more 

[w2zero]

Commence rambling royboy!  The pictures came through fine.  Bearing numbers to follow?

[Spokes]

Yep those photos look great! Tell us the break down and dimensions of parts used. Did you machine the shaft your self?

Chris

[royboycv]

Right here goes ,i have some pics  (i hope) of the mod on the rear swinging arm of an XP-X frame or an 856 .
(sorry to post again but have better pics ?)

http://imageshack.us/a/img401/2940/proflex1002.jpg

http://imageshack.us/a/img819/2743/proflex2001.jpg

 This is the finished job ,with NO mods to frame or swinging arm.

(LET MEKNOW IF THE LINK WORKS ,FIRST TIME I HAVE DONE THIS )

If it has worked ,i will rambel on a lot more 

[Colin]

If it has worked ,i will rambel on a lot more

good work!

Ramble on at will!

[royboycv]

O.K. here we go ,the main reason is that if the two pivot axle  (left and right )are not done up tight enough ,the pivot axles will move ,making the counter bores in the frame out of round ,as in the second set of pics, (not too clear )

 http://imageshack.us/a/img515/5678/proflex2006.jpg

http://imageshack.us/a/img197/3097/photo0272au.jpg

This is shown in the black marks on the frame ,plus the axle pivot will move around in the counter bore in the frame and not a firm fit .
The nexst two pics are the original parts ,there will be marks on all mating faces (frame and pivot)


http://imageshack.us/a/img89/700/proflex2003.jpg


http://imageshack.us/a/img521/2856/proflex2002.jpg

One answer i think is to make two new pivot axles and use two needle roller bearings ( 4900 2rs, 22mm od X 14mmID X 13mm long ,£9-£20 each )
 the next pics are of all thats needed !

http://imageshack.us/a/img32/6578/proflex2004.jpg

To answer your questions ,yes i am an engineer (cnc programmer miller )
and yes i am lucky enough to have a small lathe and mill at home .
If any body would like more info ,or drawings let me know.
I think i have rambled on too much and need a rest

[Spokes]

That's such an obvious and easy solution to a bearing conversion I'm amazed no one thought of it before. I say easy, if you have access to a lathe or machinist! But seriously that is a brilliant job.
Are the thrust washers for the inside face of the frame and the inner bearing face?

Chris

[royboycv]

Right here goes , the bearing you will be using will not have an inner shaft sleeve hence the need to harden the pivot axles, if you can try this out in ali first (just in case !) it might be best , from the drawing below make two of the components one with an M6 taped hole and one with a 6.1mm through hole ,the material you use must be hardend ,you can use silver steel and heat treat it your self . the 14mm dia MUST BE A GOOD SIZE the needle roller bearing will run on it. O.K. ? The 9.2mm dia is to fit in your frame in the counter bore ,this needs to be a tight fit ,it does not want to go in ,make sure the counter bore for the cap head bolt is O.K. (10.2mm dia X 6mm deep ).TO fit the new pivot axles thay must fit through the eye of the swinging arm (hence the 21.8mm dia ). Now the axle pivots have been heat treated (or not ). with a heat gun heat up the pivot mount of the frame ,till it is hot to the touch ,do not burn the paint !This sould expand the frame enough so the new pivot axles will fit all be tight ,with thread lock on the M6 bolt, do the bolt up tight while the frame is still hot ,( PLEASE MAKR SURE YOU HAVE FITTED THESE THROUGH THE EYES OF THE SWINGING ARM) .And yes the yellow round parts are the plastic thrust washers ,i would think you could make these from a milk carton or some thing like ,place two plastic thrust washers in each side ,now just slide the bearings in , do up the pinch bolts ,the jobs a good one ,good luck all let me know if you need any more info .


http://imageshack.us/a/img843/703/drag001.jpg