71 swingarm problem

zackybilly1 · Jul 8, 2009

If you are where you can drill & tap a hole, this is a cheap, easy alternative to Heinz Kegler mod. Ten bucks each.

http://www.mcmaster.com/#2380k28/=2npbm8

Z

bpatton · Jul 8, 2009

zackybilly1 said:
If you are where you can drill & tap a hole, this is a cheap, easy alternative to Heinz Kegler mod. Ten bucks each.

http://www.mcmaster.com/#2380k28/=2npbm8

Z

I've seen'em in McMaster and MSC. They do look alot like Kegler's don't they? MSC has one with a setscrew already in it. The problem with the stock cradle is that the tube for the spindle is so thin. You can crimp the spindle in it, but it still ain't structural.

chris plant · Jul 8, 2009

hi all,i,ve heard of a cheap mod that uses u shaped car exhaust clamps one at each end of the cradle tube,anyone tried this

swooshdave · Jul 8, 2009

bpatton said:
Hi Stu,
Yeah, the rod-ends allow the cradle to move freely. The rose joint, called a heim over here, on the frame is a standard item. They have a wide range of motion. The one on the cradle is called an 'elastomeric" rod-end from Lords. They do everything a regular rod-end does but they are rubber so they have some cushion. This one is rated to deflect in tension or compression 20thou at 250lbs, it's a trade off against using a straight heim on both ends. It wasn't a comfort issue, I was afraid of breaking the frame. That's why there's a tube to spread the load to both sides.

I think my question was in which directions was it intended on allowing the cradle to move.

bpatton · Jul 8, 2009

Hi Dave,

Sorry I didn't get it. Heim joints have the obvious range of motion around the axis of the bolt, but they also are able to move around that axis by twisting or rolling too. Nowhere near as much but still it's substantial. It worked out to be more than enough for cradle vibration. So in this case the rod is used to only limit the cradle movement side to side, more or less.

swooshdave · Jul 8, 2009

bpatton said:
Hi Dave,

Sorry I didn't get it. Heim joints have the obvious range of motion around the axis of the bolt, but they also are able to move around that axis by twisting or rolling too. Nowhere near as much but still it's substantial. It worked out to be more than enough for cradle vibration. So in this case the rod is used to only limit the cradle movement side to side, more or less.

If you can, start a new thread with more pictures of the rest of the set up. It looks really neat.

seaguy · Jul 9, 2009

I have gone to the expense of new adj. isos front and rear and a Dave Taylor head steady including spring gizmo so whats the best way to go on the swingarm since it is laying on the welding table?

swooshdave · Jul 9, 2009

seaguy said:
I have gone to the expense of new adj. isos front and rear and a Dave Taylor head steady including spring gizmo so whats the best way to go on the swingarm since it is laying on the welding table?

if I were to vote I'd say the collars or a setup like Bob has. I like the idea of some sort of reinforcement around the spindle.

seaguy · Jul 10, 2009

I like the heim joint solution. After looking at the diagrams of the swing arm and how it moves any side shift comes from the center stay bolt or the bushings "flanges to carriage tube" end play. Locking the shaft to the tube only addresses one of these. Now. How much will one of those new Aussie cnc heads going to set me back? :lol:

bpatton · Jul 10, 2009

Rich,
Do you have a Harley/Buell dealer near you? If you do take a look at the newer Buells and rubber mounted Harleys. They used some pretty good tech. I've seen some ads in the back of chopper mags that add a fourth link under the trans to cure squirrely handling problems. People with the rubber mounted big bikes complain about the exact same issues we have. This is what's available from Progressive.
http://www.progressivesuspension.com/to ... index.html