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Atari Yolk 14 tooth gear Repoductions

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BC_Jeffro:
found this on ebay
might give them a try

http://www.ebay.ca/itm/2-Replacement-14-Tooth-Yoke-Gears-for-Paperboy-Star-Wars-Jedi-Fire-Fox-Hydra-/291031246671?pt=LH_DefaultDomain_0&hash=item43c2d0674f&_uhb=1

TheShanMan:
I just got one yesterday for my star wars (plus I got a B gear for my outrun) and so far it seems to be excellent! Of course it's not time tested at this point but it's hard to go wrong for the price.

Xiaou2:
A tiny plastic gear should never cost +22$,  IMO.

 Especially a gear that looks to be 3d printed... and with poor accuracy.

 A gear with poor accuracy in its teeth, will end up grinding and or shearing teeth bits / or entire teeth off over time.
It can cause teeth to bind.  It can cause teeth to wear unevenly.  It can cause teeth to slip.  Uneven wear and or poor gear meshing.. can cause control issues.. where certain spots do not give an instant response.

 Gears have to have very high tolerances, most especially small tooth gears... such as seen in a VCR, Tape deck, CD Rom drive.

The larger the gear teeth, the more tolerance-play you can get away with...  but even then..  you still risk all the above that Ive stated.

Edit:

 Almost forgot...  The material the gear is made out of is also key.  Certain plastics do not fare well in certain applications.  Some gears have flex to them, which better handle shock.  Some have less friction.  Some are self lubricating. 

 Some do not do well in: high heat, high speed, shock stress, high load / pressure, continual use, low temperature, certain materials break down under too much UV light, some are not good when exposed to certain chemicals.  And if the gear that mates with the gear you are putting it.. is a different type.. such as the hardness is different..  it can cause one gear to Cut into and destroy the other gear.

 The construction of a 3d printed gear is most likely also prone to poor density and structural strength.  Where a part of the tooth could chip off where one layer meets the other.   Where as injection molded gears are formed by high pressure, as one unit, with no weak connection points.

SavannahLion:
X, larger gears do not make for an allowable decrease in tolerance, it's the application of that gear. A 30 ton composite gear can have tighter tolerances than 1/2 inch ABS gear.

In addition what kind of high stress, heat or shock are you talking about? The abuse that caused stripped gears in my lawnmower will never be witnessed by my cabs.

While I agree $22 is a bit high for what looks like a printed gear, I wouldn't knock 3D printed parts. If the cost was a bit cheaper or the printer was more accessible to BYOAC members, would the life of such a gear matter? At $5, how often would you be willing to replace it? Once a year? Every two years?

For many hard to get plastic parts, I see printed parts as a very viable option. What if Randy or Andy offered such a service at low cost? What then? If the cost is reasonable, I'll be first in line for the new gears I need in my cab.

Xiaou2:
SavannahLion,

 Im not exactly a gear expert... But with experimentation, as well as some limited research, made many realizations.

 Your correct though.. certain gears, even in large sizes have to be very precise.

 In my case, when using larger gears for a Starwars yoke I built.. I found that small off-center variences were more tolerable, as the teeth were still large enough to mesh well.   Not quite the case with tiny tooth gears... which would require something like a rigid steel housing without flex in it... and precisely machined holes.

 A good example of this issue is with the original Arkanoid spinners.   Out of all the originals Ive ran across... all of them have gear issues, and no longer work properly.  The teeth are like less than 1mm depth... so if any bearing is out of place, or wears even the slightest.. the teeth will grind, skip, break, and lose any decent meshing.   The larger wider teeth, on applications like Starwars, are far more forgiving in this regard.


 I also agree, that $5.00 is far more reasonable for a substandard part thats bound to fail.   However, in the same token, it would be much nicer to see a non-scammer make a mass repo run of high quality gears, for reasonable prices.

 Also, when we consider printed parts.. remember that there are many kinds of 3d printers, and various tech behind them.  Some are FAR more accurate and durable than others.  Some are actually capable of printing quality accurate and useable gears.  This example isnt really the case, which is why I decided to point that out. 

 ( It turns out that the description says its a 3d printed part, and lists the material as well.   Didnt notice that before )

 Also, its very possible that there are existing gears already matching the specs many of us need... just that not a lot of us know about them en mass.   (and or maybe gears out there that only need minimal modifications, to be useful)

 Even when Scam Controls was / thought to be legit...  his prices were incredibly high...  and his kits were non-customizable... making you pretty much need to buy the most expensive overhaul possible, all at once, rather than little bits, as you could afford it.

 

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