Slipjoint Rise fall indicator and bushings

[AVigil]

Trying my hand at using bushings for slipjoints.

The bushing needs to remain in the same position as the blade rotates around it.

In the Rupple Jig aka Rise fall indicator, getting the bushing to stay in alignment and not move can be a challenge. You can use an exacto knife or scribe to hold it but that mars the bushing and is a pain.

What I came up with is a "Bushing Holder" to use on the Rupple Jig. I made it from nickel silver but it can be made from anything.

You simply place the Bushing Holder over the 3/32 pin and on top of the bushing. Put light pressure on the holder to keep the bushing from moving as you rotate the blade.

This makes it much easier to keep the bushing still and insure it always is in the same place while using the indicator.

Take a look, sorry for the video my phone was acting up and I really needed a third hand or tripod but you will get the idea.

 

[Hengelo_77]

Why is it important that the bushing doesn't move?

 

[AVigil]

Why is it important that the bushing doesn't move?

The bushings are almost perfect, but the fact is the hole is not 100% in the center an can be a couple of thousands off.

So you want it in the same position all the time so the back spring will always be at the same height as the blade rotates. THis allows for the spring to be flush in open, half stop and closed positions.

 

[Jason Volkert]

I'm guessing the "bushing holder" is the same exact size as the bushing on the side that holds the bushing

 

[AVigil]

I'm guessing the "bushing holder" is the same exact size as the bushing on the side that holds the bushing

It is the same size, but even if it were larger it would work.
The bushing is .001" more then the tang.

The reason the bushing is a bit bigger is when the pivot pin is peened it will expand into the bushing and lock in the liners, but the blade does not get compressed by the peening of the pivot pin.

This allows for the blade to rotate around the bushing and not the pin.

In making slip joints it is very easy to get the blade to tight on peening the pivot, it is very easy to do if not careful. The bushing helps with that and makes for a smoother moving blade.

 

[Jason Volkert]

Thanks for the info. I plan on trying to make some slip joints sooner or later.

 

[AVigil]

Thanks for the info. I plan on trying to make some slip joints sooner or later.

Give it a try, making slipjoint is really a challenge.