Pointy swing arm side play.

[fastdruid]

Originally Posted by yorkie_chris

How? It is only applying force on LHS spar, it cannot negate by tension a compression the other way.

how to describe it? you can't stand in a bucket and pick yourself up by the handle.

Force is applied outwards from tightening the spindle, this presses the entire swingarm assembly against the LHS pushing it out, agreed?

But the spindle does not screw into the LHS frame, there is a nut on the end and tightening that nut compresses the entire assembly tensioning the swingarm and with it LHS frame essentially into the shoulder on the RHS of the spindle.

Druid

[DavieSV]

I past the spindle bolt through the assy. and spaced it out and tightened the nut to apply pressure to the outside of the two inner bushes

[yorkie_chris]

Originally Posted by fastdruid

Force is applied outwards from tightening the spindle, this presses the entire swingarm assembly against the LHS pushing it out, agreed?

But the spindle does not screw into the LHS frame, there is a nut on the end and tightening that nut compresses the entire assembly tensioning the swingarm and with it LHS frame essentially into the shoulder on the RHS of the spindle.

Druid

the more you tighten the spindle into the frame (one end only), the 'bigger' the spindle-bearing-spacer-bearing part is aye?

If you make it 5mm bigger by screwing it in 5 turns or whatever the pitch is then it will spread the frame by that amount. The only way tightening the locknut on the other side will help is if you apply enough force to compress the spacer back to its original dimension.

If the shoulder of the spindle and the bearing assembly was rigid then any measurement of the spindle shoulder screwing in must push the frame out.

[fastdruid]

Originally Posted by yorkie_chris

the more you tighten the spindle into the frame (one end only), the 'bigger' the spindle-bearing-spacer-bearing part is aye?

If you make it 5mm bigger by screwing it in 5 turns or whatever the pitch is then it will spread the frame by that amount. The only way tightening the locknut on the other side will help is if you apply enough force to compress the spacer back to its original dimension.

If the shoulder of the spindle and the bearing assembly was rigid then any measurement of the spindle shoulder screwing in must push the frame out.

Yep, that just about sums it up.

Druid

Originally Posted by DavieSV

Malleable = hit it with a hammer, it dints.
Brittle = hit it with a hammer, it breaks.

Correct

[yorkie_chris]

And pure aluminium is malleable. Cast tends to be brittle. Mostly in the HAZ of any welds.

[DavieSV]

I've decided I'm going to shim the bushes on both sides.

I've got a brass job to do tomorrow on the lathe, so I'll make a couple of brass washes up to sit between the head of the bush and the end of the swing arm pivot tube. Then bolt it all together and see what it like.

I toyed with the idea of skimming the end of the bushes down, but that would offset the swing arm a little and would be non-reversable.

We're only talking a quarter of a turn on the nut, 0.5mm either side at the wheel is more like 0.1mm at the swingarm mount.

[DavieSV]

Originally Posted by svdemon

We're only talking a quarter of a turn on the nut, 0.5mm either side at the wheel is more like 0.1mm at the swingarm mount.

[yorkie_chris]

Maybe up/down depending where you are in the travel but side to side play there (note; not angular) will be direct. .5mm at pivot will be .5mm at wheel