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Old 04-01-2009, 01:36 PM   #1
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Default 3mm diff balls, wanting to support US stores

does anyone have a good source for some 3mm diff balls besides tamiyausa or eaby. i wanted to try and get them pretty quickly, and from a US dealer, but all i have found was dumb ebay things... i dont want to wait 3 weeks for one little envelope from HK.
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Old 04-01-2009, 01:55 PM   #2
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Try Amain:
Ceramic
Tungsten
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Old 04-01-2009, 03:41 PM   #3
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http://www.bfastrc.com/index.html
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Old 04-01-2009, 04:01 PM   #4
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these are very good

http://www.speedtechrc.com/store/ebp...id=689&id=7735
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Old 04-01-2009, 04:23 PM   #5
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Tower sells Acer balls in 3.0mm in both tungsten-carbide and ceramic nitride. The tungsten are pretty cheap too.
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Old 04-02-2009, 12:43 AM   #6
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Just get them from McMaster Carr:

http://www.mcmaster.com/#9292k33/=19kn8y

No more paying $5 for a pack of 10. You get 100 for a little more then six bucks...
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Old 04-02-2009, 01:53 AM   #7
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Quote:
Originally Posted by tom_chang79 View Post
Just get them from McMaster Carr:

http://www.mcmaster.com/#9292k33/=19kn8y

No more paying $5 for a pack of 10. You get 100 for a little more then six bucks...
that's for steel though, the carbide ones are $10 for 5
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Old 04-02-2009, 02:31 AM   #8
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BOH!

Well, I wonder if every manufacturer's diff balls are carbide... For a pack of 100 at six bucks, why not use the E52100 Steel balls?

They are "chrome" style balls. Perhaps I lack the understanding of why hobby cars uses carbide balls for the diff?

I recently bought a pack of these, actually stainless steel (which are even more $$$) with steel rings to use on my B44. Haven't replaced them yet, but will let you guys know how they perform.

I figure a set of steel rings and stainless steel balls are better then carbide ones that are now shot due to usage...


Does anyone know why carbide is specified on the diffs of many of the high performance kits such as the B44? What's the advantage of carbide versus other grades of steel (such as the E52100)?
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Old 04-02-2009, 02:47 AM   #9
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Quote:
Originally Posted by tom_chang79 View Post
BOH!

Well, I wonder if every manufacturer's diff balls are carbide... For a pack of 100 at six bucks, why not use the E52100 Steel balls?

They are "chrome" style balls. Perhaps I lack the understanding of why hobby cars uses carbide balls for the diff?

I recently bought a pack of these, actually stainless steel (which are even more $$$) with steel rings to use on my B44. Haven't replaced them yet, but will let you guys know how they perform.

I figure a set of steel rings and stainless steel balls are better then carbide ones that are now shot due to usage...


Does anyone know why carbide is specified on the diffs of many of the high performance kits such as the B44? What's the advantage of carbide versus other grades of steel (such as the E52100)?
The steel balls are 60 to 65rc (Rockwell hardness scale, diamond is 100) Carbide balls are in the 80s. The steel balls will get a flat spot the first time they slip, this will cause rapid wear of the ring and ball. The steel balls will also just plain wear faster than the carbide. The carbide will not flat spot and with proper cleaning and re-lube will last much longer vs the steel balls. I am still using the same set of carbide balls in my losi XXXT from the spring of 2008, third set of rings.
The initial extra cost of carbide is well worth it in my opinion.

Fred
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Old 04-02-2009, 09:18 AM   #10
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well, i ended up finding what i needed at stormerhobbies.com they have a great amount of parts there, so i just got some little things until it added to over $10, and im good. i got 2 sets of hotbodies D4 3mm diff balls. they should last me for a time, until then, i will check out all the other sites for some better carbide balls.

thanks again guys.
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