Using a Russrep cone and a threaded rod....discuss

[Sumatra]

OK, so there are quite a few of us who want to use a Russrep cone/emitter, but have a saber that uses a threaded rod. I've been trying to come up with a way to do it, but because different grenades are made differently, one solution will not work for everyone.

So here's what I came up with. I have a Chen grenade. This doesn't have a bottom on it so it gives me access to the inside. My thought was to screw an adapter into the inside that I can screw the threaded rod into. The Chen grenades don't have threading all the way through the neck, but I tapped mine straight through so that isn't an issue.

Anyone else have thoughts on a good way to do this?

Here's a diagram of my idea.

 

[scarf man]

Does the Chen grenade have a lip on the inside of the bottom? Or is it straight walled all the way down?
It's been years since I sold mine.

 

[scarf man]

I was thinkin something simple like this.

This type of connection could explain the bend at the screw pivot points in the Chronicles 3/4 pic maybe.

 

[Sumatra]

I'll have to check when I get home. I can't remember.

 

[Darth Lars]

The cone has a hole in it. You could tap this for a threaded rod.

However, I think that most sabers that people have are already made for a threaded rod of a diameter that is too large for the "cone". You could make an adapter by soldering/welding/gluing two nuts (or other tapped pieces of metal) together.

 

[Sumatra]

Does the Chen grenade have a lip on the inside of the bottom? Or is it straight walled all the way down?
It's been years since I sold mine.

Here's my Chen bottom. Obviouly I added the holes.

 

[Serafino]

My reasoning may have holes in it but as I understand things, this is what I see:

1. The inside/attachment piece ('cone') cannot be modified to accept a threaded rod without compromising accuracy of how it appears inside the emitter, therefore

2. The non-Russ grenade must be modified to fit the inside piece, or the inside piece must be modified to fit the grenade, so that they can join in the way the inside piece is designed to work. Possibly only a custom inside piece made for the specific grenade will work here. (I doubt the Chen thread and the Russ piece thread are the same).

3. Given the above, a means of securing a threaded rod somewhere inside the grenade must be found. The easiest options I can think of would be:

a). Put a threaded insert at the bottom of the neck/stem inside hole which will fit the threaded rod. This will probably require drilling the area out and epoxying a length of inside thread tube in that location. Possibly a threaded insert could be used, like the self-tapping variety, although this seems like overkill.

b). Follow ATL_Kenobi's ideas of using washers with o-rings squeezed between them to expand and lock in place an anchor inside the frag body to which the threaded rod can be attached.

c). Just glue a threaded anchor in place inside the frag body. This can be made from plastic or metal fairly easily.

 

[desolate]

you could always make a piece that will Press fit in the bottom and have it threaded so you can easily screw it together. It would have to be about .004 over to be press fit.. if you are worried about that you can always get a larger tap the same size at the inside of the bore opening and machine the piece longer with the same threads.

those might work.

 

[Sumatra]

2. The non-Russ grenade must be modified to fit the inside piece, or the inside piece must be modified to fit the grenade, so that they can join in the way the inside piece is designed to work. Possibly only a custom inside piece made for the specific grenade will work here. (I doubt the Chen thread and the Russ piece thread are the same).

By "inside piece" do you mean the cone attachment part? Russ said he was going to custom machine cones with threading to match our non-Russ grenades. This eliminates the problem of attaching the emitter.

 

[Serafino]

Yeah, I figure since they're not all cones we probably should stop calling them cones.

Well I'm glad that aspect is not part of the issue here. It also leaves open the possibility of doing your own piece and soldering or epoxying things together for that extra edge of versimilitude.