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Old 12-13-2004, 08:22 PM   #5536
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if the nitride layer is only a few microns think... then how does it reduce the amount of rotating mass? surely a few microns of nitride will not be able to reduce rotating mass to a significant measureable point?
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Old 12-13-2004, 09:35 PM   #5537
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Quote:
Originally posted by raffaelli
What is the diameter of those sways?
they vary from 0.8-1.8 I believe (in increments of .2)

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Old 12-13-2004, 09:43 PM   #5538
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Thanks Steve.
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Old 12-13-2004, 10:32 PM   #5539
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Default Diff Balls

There is no core to the Silicon Nitride Diff Balls and they are not coated. This is pure solid Silicon Nitride Ceramic material that is formed and shaped to be spherically round and then polished up to be metal like smoothness and superior hardness.

Tungsten Carbide Balls = .54 lbs/cubic inch

Chrome Steel Balls = .283 lbs/cubic inch

Silicon Nitride Balls = .116 lbs/cubic inch

It can't be just a coating or there would not be this much of weight difference for a couple microns thickness.
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Old 12-13-2004, 10:47 PM   #5540
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Quote:
Originally posted by Carl Giordano
Randy, what servo horn is that? I'm still using the Tamiya servo savor which seems to work fine. Are your using a full metal servo?
It's an Ofna servo horn on a Futaba S9550. I never run any kind of servo savers, even in off-road, and never broken a servo yet.
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Old 12-13-2004, 10:49 PM   #5541
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Quote:
Originally posted by rcnewb2004
randy,

i just want to see what hte difference is. I heard a lot of good stuff about ceramics, reducing rotating mass and such. But i want to buy a set of bearings, and not go thru all the measurements and stuff myself. so if anyone can offer a website that has a set of trf415ms quality ceramic bearings for sale, that'd be nice.

and ur new born trf415ms is the cutest thing. that aluminum servo horn looks cool, where'd u get it? does it get rid of the slack that the tamiya horn has sometimes?
To be perfectly honest with you, you wont notice any difference on the track with ceramic bearings as opposed to stock ones. Use the cash to get a good battery and motor instead.
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Old 12-13-2004, 10:51 PM   #5542
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Quote:
Originally posted by Blakesrc
Randy,

Looks good dude. Deffinetly let us know how it goes on Tuesday night, i might be in the area and make it to race on the tuesday evening after christmas.


Good Luck,

Blake
If you make it, drop by my pit and say whats up Hopefully pro-mod gets a good turnout, I dont wanna make this thing run a 19 turn motor
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Old 12-13-2004, 10:53 PM   #5543
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Quote:
Originally posted by Ballsie
Randy, did you trim the foam bumper (fender) or is that a different part?
It's a trimmed stock bumper. Removed some material that was hitting the front of the body so that it should give more steering.
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Old 12-13-2004, 10:53 PM   #5544
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Quote:
Originally posted by Ballsie
Did Rheinhard use the Alex Racing Barracuda R3 sway bar kit
(Product # A6341-A6343) during the worlds?

I noticed the decal on his car as well as the black sway bars like these ones -

The ALEX Parts that Marc Rheinhard used was the Ti Coated shock shafts for the TFR Dampers...... that I know of... but the Sway bars might have been used also
-Dave
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Old 12-13-2004, 10:56 PM   #5545
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Quote:
Originally posted by MikeR
Eww it looks terrible Randy... you need to sell it to me right away.


I'm sure that in a month or so I'll have a couple more as backup cars, and maybe a carpet car with a 3mm chassis, so this one might be able to be sold
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Old 12-14-2004, 02:32 AM   #5546
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Quote:
Originally posted by Randy Caster
It's a trimmed stock bumper. Removed some material that was hitting the front of the body so that it should give more steering.
Thanks, I'll probably try the same myself
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Old 12-14-2004, 02:45 AM   #5547
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Default Re: Diff Balls

Quote:
Originally posted by 190mph
There is no core to the Silicon Nitride Diff Balls and they are not coated. This is pure solid Silicon Nitride Ceramic material that is formed and shaped to be spherically round and then polished up to be metal like smoothness and superior hardness.

Tungsten Carbide Balls = .54 lbs/cubic inch

Chrome Steel Balls = .283 lbs/cubic inch

Silicon Nitride Balls = .116 lbs/cubic inch

It can't be just a coating or there would not be this much of weight difference for a couple microns thickness.
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Old 12-14-2004, 03:35 AM   #5548
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what do these lbs/cubic inch mean?
those are the density of the balls? so the nitride balls have the lowest density, therefore the lightest when comparing ot the other two? or is it how much pressure those balls could take before they crack? sorry my physics and units are horrible.
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Old 12-14-2004, 06:15 AM   #5549
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well it's the first time i hear of an engineering material that is full ceramic. Even for machining tools the ceramic is only a coating, because making them a full material would be well too difficult and expensive, plus it would break at the first shock on it.

Anyway, I agree with Randy, better invest in some batteries of even better, spend the money into racing more (i.e. instead of spending $100 for a set of bearings, buy some tyres and spend some fuel with the cash to go racing). This way you'll have more FUN.
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Old 12-14-2004, 09:13 AM   #5550
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Quote:
Originally posted by Ballsie
Thanks, I'll probably try the same myself
Just beware your car will be much more prone to breaking on front end impacts if you cut the bumper.
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