If doing a build with no Teflon liners and 3/16?

[JPriami]

I'm building a twin 32" cat. I'm going to use hughey .187 cables. I'd like to run this without the Teflon liners. I have two pairs of brass stuffing tubes on hand. What would be best?
One set is the 7/32 and the cables fit inside them just barely and turn ok straight because there hasn't been a bend made yet.
I have a pair of 6mm tubes and the cables fit but have some play between cable and tube.
I was wondering who has experience with these and what's best choice?

[LarrysDrifter]

Id use 1/4".

[Fluid]

I use 1/4" OD brass tubing as well. There needs to be some radial clearance between the cable and the tubing, otherwise friction is very high. As long as you use a decent cable lube wear won't be a problem.


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[JPriami]

Well I ordered the 7/32 stuff ose recommended. And it's a tight clearance. Only other stuff I have is 6mm (0.236) and 9/32. Should I just use the 6mm? that's pretty close to 1/4".

[JPriami]

I started test a different grease lately too. It's 2-4-C made by mercery marine. Has Teflon in it.

[Fluid]

The 7/32" is perfect for the 0.150" cable but too tight for the 0.187". I have no idea why Steven has not corrected that typo. The choice of tubing you have is dicey, the 9/32" is pretty loose and is intended for use with a Teflon liner; the 6mm a bit tight. If you cannot wait to buy the 1/4" from a local hobby or hardware store (ACE Hardware carries it in my area) then try the 6mm. The Mercury grease should work well for you.


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[G-UNIT]

If you have a close tolerance between the cable and stuffing tube try a product called INOX, it's a spray lube that dissapates water and also comes with teflon, I've used it quite a few times on the UL-1 with smaller stuffing tube with no liner, give it a try.

[Fluid]

The biggest issue with undersized tubing (among several) is that when it is bent it goes slightly out-of-round at the bend points. Depending on the bend it can pinch already-tight tolerances and cause a bind. No lube in the world will make up for a tight pinch point.


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[BrianW]

The best grease to use is a product called Lubriplate. Have used it for years on all my nitro and gas builds

[JPriami]

Well I had started last night on getting tubes and motor mounts in. Good thing is I only tacked the tubes in with 5min epoxy.

I will give the 6mm tubes a try toady. They won't have but a vert slight bend in them. Only one angle with no S shape.

[Fluid]

The best grease to use is a product called Lubriplate. Have used it for years on all my nitro and gas builds...

That's not very helpful since Lubriplate offers a score of different greases for sale......

http://www.lubriplate.com/products/greases.html

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[m4a1usr]

Well I had started last night on getting tubes and motor mounts in. Good thing is I only tacked the tubes in with 5min epoxy.

I will give the 6mm tubes a try toady. They won't have but a vert slight bend in them. Only one angle with no S shape.

One trick to keep stuffing tubing from deforming (for the most part) while bending to your desired shape is to anneal the tubing where your planned bends are and the ends. Crimp one end (with a pair of vice grips) and fill the tube with sugar. The trick is to get the sugar as compacted as possible while filling it. This will require you to "tap" the first sealed end on a hard surface as you add. That removes any voids. Once you have gotten it compacted crimp the opposite end. Now you can proceed with the bend you require. Once its bent, take a small tubing cutter and remove the crimps, then over your sink or trash. Dump the tubes contents. The only thing you need to make sure is the ends of the tubes OAL are longer then needed, you remove all of the packing material (sugar) and you take a reamer and resize the ends if using a tubing cutter (easiest method). I like to rinse mine in water when complete to. Not that sugar is corrosive (unlike salt) but warm water will remove any crystals left behind. Then you push some pieces of cotton thru from one end to dry and lubricate the inner surfaces.

John

[G-UNIT]

Fluid: I understand what your saying and I agree, thats just common sence, and some times reading different posts some folks just don't see. however with a good bend with no pinch points and close toleances you would think that the flex shaft has less vibration and spin true. and if you did suspect an issue it would show up on the flex shaft as a hot spot with discoloration and sooner then later would fail, just my thoughts, everything I read and ask you i take as knowledge from someone whos been doing this for quit a while and respect your thoughts,comments ect.
as always thanks for your input.

[Chenige]

Glad I read this one. I have some very high heat in the non tefloned tube sitting on the bench and was wondering why. bend was not that severe but the shaft had a hard time going in.

Must have deformed the tube at the bend.

[BrianW]

Sorry, its #115 and I carry it

That's not very helpful since Lubriplate offers a score of different greases for sale......

http://www.lubriplate.com/products/greases.html

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