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Author Topic: Prop Shaft Bearings and Teflon Disks  (Read 334 times)
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Laminar001
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« on: April 03, 2017, 10:23:51 PM »

Hello

Interesting posts these ones.

Just to add my experience on prop shaft bearings; I have found that very small plastic beads as found in my daughters jewellery kit work wonders behind the prop of my rubber models.  This is due to the prop being curved at the rear at the shaft exit and the bead surface being curved.  The result is very small surfaces rubbing together = low friction.  A little lubricant helps in between.  With timber props and folding props, yes a Teflon disk would work well in between the prop surface and the bead.

Beware you might have to pay $1.00 to your little daughter or grand daughter for a bead... My daughter has decided this is good business.

Teflon sheet can be sourced from specialty engineering supply shops.  The kind of places that sell unusual engineering materials and unusual fasteners such as Nylon bolts and nuts.

Regards

Marc.
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gossie
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« Reply #1 on: April 03, 2017, 11:36:38 PM »

I've been using teflon for years, and yes, it works well.

That SBF has a 10in. blade on it. Approx. 22in diameter prop.
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Re: Prop Shaft Bearings and Teflon Disks
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NormF
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« Reply #2 on: April 04, 2017, 03:04:16 AM »

Been very satisfied with teflon bearings. The large ones 1/4" or so, I turn on a lathe from teflon rod stock. The smaller ones I make from sheet teflon. I drill the shaft hole and then punch out with a hand punch. If you remove the trap, you can eyeball the center. The punching action slightly distorts the teflon. I make two and put the convex sides facing each other. Here's a typical 1/8" punch.http://www.google.com/shopping/product/2139420344583011613?lsf=seller:3122104,store:17454141905440469589&prds=oid:16250233052529102620&q=1/8%22+paper+punch&hl=en&ei=x0LjWLLTOOye0wKos7EY&lsft=gclid:CLSU8dObitMCFVKDfgodGGUFJw

Norm
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Laminar001
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« Reply #3 on: April 04, 2017, 03:18:47 AM »

Thanks Norm

This is very interesting, I'm enjoying this one.

Regards

Marc.
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pedwards2932
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« Reply #4 on: April 04, 2017, 06:31:17 AM »

I was at WalMart and I found some tiny glass beads that work pretty good.  I think I got about a couple hundred of them for about $3.00.  They are black and the hole is the correct size for the shafts I have been using.
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Laminar001
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« Reply #5 on: April 04, 2017, 08:18:40 PM »

Hello Pedwards

Yes I think they work well also.

Marc.
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Warhawk
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« Reply #6 on: April 05, 2017, 12:32:52 AM »

If you have a fishing fly shop around that sells fly-tying things, there are some brass and nickel-coated metal beads that come in handy sizes.  Same idea as glass or plastic beads; these have a small hole (I've got .031, .047, and .062") on one side, and a larger opening on the opposite.  They work very well with a bit of oil on them, and add a bit more nose weight out front. . .

Justin
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Laminar001
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« Reply #7 on: April 10, 2017, 05:46:27 PM »

Hello Justin

Thankyou for the fishing bead idea I have checked them and they are very good. More precise than jewellery beads.

I had a look in my tackle boxes and discovered I had a few.

Regards

Marc.
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