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Author Topic: Source for thrust bearings that won't kill me on postage!!  (Read 635 times)
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Dan Snow
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« on: September 23, 2018, 05:42:16 PM »

I'm nearing the finish on my two sorta No-Cal models, and realized the only thing I don't have is the small nylon thrust bearing. I'd order some right away, but really don't want to spend $9-$10 in shipping for a @2.50 bag of parts.   Does anyone know of a source that has a reasonable shipping cost for small orders?  I don't really have a need to order anything else right now.

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NormF
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« Reply #1 on: September 24, 2018, 12:00:37 AM »

Not sure if we’re talking about molded prop hangers or thrust washers. If thrust washers, here’s what I do. I have sheets of Teflon in various thicknesses, drill holes in the sheet. With a paper punch, center the hole and punch out a washer/bearing. Paper punches, with a little searching, come in 1/16, 1/8, 3/16 and most common, 1/4”. The punch will make slightly convex washers, face the convex towards the bearing surface.
You can also use nylon, delrin, and probably HDPE (bottle plastic).

For larger models, I turn the washers on a lathe and use Teflon or delrin AF rod

Norm
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ghcrash
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« Reply #2 on: September 24, 2018, 04:25:29 AM »

For my No-Cals, I do as Norm does except I also add a small glass bead between the back of the prop and the Teflon washer. 
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Dan Snow
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« Reply #3 on: September 24, 2018, 06:28:31 AM »

The thrust bearings I'm referring to are basically a tube with a convex flange at one end. They go through a hanger, usually aluminum, and support the prop shaft.
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Rossclements
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« Reply #4 on: September 24, 2018, 08:49:23 AM »

Have you looked at Peck-Polymers? They sell stuff like that and are US based. I've never ordered from them so I don't know what shipping is like.
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adanjo
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« Reply #5 on: September 24, 2018, 09:05:50 AM »

Don't you like pigtail thrust bearings? I use them for my Nocals because they can be bent to adjust thrust angles.
I make them by myself or buy from IndoorSpecialities by Ray Harlan. Socience Olyimpiad Bearings are good for Nocals.
http://www.indoorspecialties.com/index1.html

Aki
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Dan Snow
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« Reply #6 on: September 24, 2018, 03:50:19 PM »

Have you looked at Peck-Polymers? They sell stuff like that and are US based. I've never ordered from them so I don't know what shipping is like.

For what they charge for shipping I can drive to my not really local hobby shop, pay a bit more than twice what PP charges, state sales tax, drive home, and still have spent less money than if I had ordered them.

Just for the heck of it I did send a very polite email to them asking if they would be willing to toss the packet in a regular business envelope and mail them tome, I even offered to pay for the stamps!  Haven't heard back from them yet. Smiley
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indoorguy
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« Reply #7 on: November 01, 2018, 09:21:17 AM »

I regularly send my pigtail thrust bearings in a small padded envelope by USPS first class mail for $3.50 to $3.75 anywhere in the country. As an example, at the current government reimbursement rate for business use of a car ($.55/mi), you would have to drive less than 3.5 miles one way to save money over postage. I wish I had a good hobby shop 3.5 miles from me!

For NoCals that weigh on the order of 3 grams, or so, I would recommend using Pennyplane bearings.

Ray
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Glidiator
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« Reply #8 on: November 03, 2018, 02:52:25 AM »

Has posted a thread 2 years ago of making your own bearing using soda can cap ring.

 Wonder if anyone else has tried it and what the result was.

Every beer or soda I drink now adds to my collection of rings for converting to bearings.

http://www.hippocketaeronautics.com/hpa_forum/index.php?topic=20755.msg187600#msg187600


Anant
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lincoln
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« Reply #9 on: November 06, 2018, 04:20:18 AM »

If you're good with pliers and a real cheapskate, you can make a wire pigtail bearing. Just like the one from the Hobby Shopper article except with heavier wire. .018" (Hint: aka used .018" guitar string)
https://web.archive.org/web/20050105003347im_/http://www.indoorduration.com:80/Images/HobbyShopper7.gif

from this page:
https://web.archive.org/web/20060112013619/http://www.indoorduration.com:80/IndoorDurationFrame.htm

There were lots of interesting articles on the old Indoor Duration web site. Not sure how many made it onto archive.org aka the Wayback Machine.

Ray's bearings, however, are excellent.
Source for thrust bearings that won't kill me on postage!!
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Maxout
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« Reply #10 on: November 06, 2018, 12:30:31 PM »

I made a really cheesy video on wire pigtail bearings a while back. Perhaps it will help here: https://www.youtube.com/watch?v=0FfgHeLOV6U&t=5s
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