Binding resolution needed.

Long story short I'm returning to finishing my bike after a year away for several reasons. The last time I was working on it a friend and I attempted to adapt madass's one piece axle to CNW's X-ring conversion rear drum setup. The stub axle part seems to rub on the inside of the drum even before things are tight and I could barely get the circlip in the groove behind the double row sealed bearing. The wheel has sealed bearings too. I'm wondering if I'm missing a part or assembling things incorrectly or maybe some material needs removed from the stub piece to accommodate the size of the sealed double bearing in the CNW setup?? As it is I can't push the stub piece in so it makes good contact with the center of the bearing and turns smoothly. I'm no wrench so maybe that's not the problem but when everything is tightened the wheel binds up. I talked ever so briefly with Don about it at the time and he couldn't see what the problem is and I don't want to bug Matt as he's got enough on his plate. Here's a few pics including one of the rear drum schematic and a part that I thought I was missing.

Cheers,

Brad

You don't say what year and model this is, ALWAYS helpful...

In your top picture, your brake drum doesn't seem to have the lug/spacer sticking out of the brake drum to space it against the wheel bearing in the hub.
This means the axle would be pulling the drum HARD into the hub via the lugs for the cush hub.
The more you tightened the axle nuts, the harder it would push them together.

But the design intends that the spacers along the axle take the forces.
This aspect is hidden in the parts list drawing, its behind the view of the brakedrum. (what is item 33 ?)
No idea why that would cause the stub axle to rub on the brake drum - pulling it unevenly sideways perhaps ?

This comment is from an early 850 wheel and brake drum spare here....

Can get a pic if any help, although I note I don't have that large circlip in the brakedrum,
so maybe these are different somehow ?

I am doing exactly the same thing to my '71 but I have not gotten to the rear wheel yet. Matt and Don were helpful but I realize that I was in "uncharted waters" with this so I will be watching this thread closely.

My plan is to have Matt's stub axle drilled out to accept Dons solid axle while keeping the spacer right for Matt's bearing.

Vince

Working on the theory that a pic is often worth many thousands of words,
this is a view of what is missing ?
Pardon the rust...

Thanx for the lead. It's a 74'.

you seem to be missing item 23. as the previous poster suggested

Thanx Don. I ordered that part. I'm not sure what happened to the one I had, into the vortex I suspect....

Snorton74 said:

Thanx Don. I ordered that part. I'm not sure what happened to the one I had, into the vortex I suspect....

Click to expand...

The "Shed Fairies" I got the bastards too. Now that you have ordered a new part "they'll" put it back just over there!

Brad,

Just found this thread

Even though I am busy in the shop, don't hesitate to get a hold of me there. It can save you some frustration

I have not seen the one piece axle kit that Madass offers but I would suspect that this is whats going on:

- In order to fit the wider, sealed double row bearing I use in my x-ring conversions, the rear drum has been modified in regards the bearing pocket depth. I bore that 0.060 deeper.
- To make this work I also have to turn the stubby axle that same 0.060 at the end that goes against the bearing

So it appears that in order to fit the Madass spacer, that will have to be turned down 0.060 on the bearing side to fit. Then this will also allow the bearing to fit into the pocket and the cir clip will fit no problem.

As mentioned, you also need to make sure you install # 60-2070 spacer between the hub and the sprocket. This spacer will fit into the double row bearing in the sprocket. Not using it will damage the bearing when all is tightened up

Maybe the Madass kit uses something different there but there has to be some sort of spacer in order for it to work right

Hopefully this will make sense and if not, call or email me at the shop

Matt / Colorado Norton Works

http://www.coloradonortonworks.com

Thanks for the info Matt. You're right, I think we damaged that bearing tightening things up without the spacer. I'll remove some material from Madass's stub piece like you say, add the missing spacer and order a new bearing.

Reporting back for the interested... I added the missing bearing spacer and removed some material on the inboard side of the single axle spacer as Matt suggested and everything went together correctly. It's finally headed outside to my shop for finishing up... Thanx again for the help!

Too late we lost interest by now so don't care. Just teasing and hope I never need to learn to do that much on that area - again. Go out and make a joyful noise.

You saved me a bunch of fiddling as I'm about to do the same-thing to my '71, thanks!

Vince