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Ark › where to buy correct pinion
02-10-2006 08:14 PM  12 years agoPost 1
saridnour

rrApprentice

Seattle (Issaquah), WA

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so there is a difference in the pinions between the x400 and the trex (4.8 vs 5mod as I understand it someone correct me if I am wrong). Now I have not seen any set screw type pinions online w/5mod. They all seem to be shogun pinions that need to be loctited on and usually out of stock at that.

Anyone have a source for these pinions? I'm looking for 8-9 tooth 2.3mm but a source for any would be good to know.


What goes up, must come down
-Andy Ridnour
X-400 stretched, Evo50, HB v2

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02-10-2006 08:41 PM  12 years agoPost 2
skeppley

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Auburn PA

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Here ya go:
http://www.allerc.com/product_info....roducts_id=1531
and
http://www.grandrc.com/inc/sdetail/4212

The Trex pinions are a perfect fit. Not sure where you got your info from.

Shane

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02-10-2006 10:02 PM  12 years agoPost 3
Soniq7

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Sacramento CA

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Justgofly.com has all pinions.

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02-11-2006 12:40 AM  12 years agoPost 4
Dennisu

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Langley, B.C. Canada

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saridnour

I believe they both use the .5 mm modulus tooth pinions. Only the number of teeth on the drive gear are different. Trex uses 150 and x400 uses 138. Only difference in pinions would be for the shaft size of the motor that you use.

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02-11-2006 02:14 AM  12 years agoPost 5
saridnour

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Seattle (Issaquah), WA

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I had heard that they were different and sort of work but are not exact. Matter of fact, here's another thread detailing the issue: http://www.runryder.com/t210572p1/?highlight=450f


What goes up, must come down
-Andy Ridnour
X-400 stretched, Evo50, HB v2

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02-11-2006 02:45 AM  12 years agoPost 6
Soniq7

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Sacramento CA

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I think those guys are talking about using 48mod rc car pinions.

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02-11-2006 04:00 AM  12 years agoPost 7
Dennisu

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Langley, B.C. Canada

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saridnour

Like I said they are the same for trex and x400. The comments about 48 pitch, which is the wrong modulus, has nothing to do with either helicopter. The pitch of the teeth has nothing to do with number of teeth on the driven gear or the pinion. It has to do with the size of the teeth more than anything. You can have a 12 tooth gear that is 50 feet across with the right modulus.

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02-13-2006 02:15 PM  12 years agoPost 8
zo6

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Ohio USA

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The 48 pitch car pinions work fine. I'm runing a 12 tooth 48 pitch pinion and it runs smooth and quite. They are 1/8" or what is called 3.17 or 3.2mm bore. Some RC road cars have been cheating on pitches for decades to get different ratios. The 48 pitch pinion is on the top in the below photo.

Double click to enlarge.

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02-13-2006 03:46 PM  12 years agoPost 9
Dennisu

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Langley, B.C. Canada

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zo6

If you read some other posts you will find that people who tried to use 48 pitch pinions have ended up chewing up drive gears in time because they don't exactly match. There is no reason to use the wrong modulus gears when the right ones are available.

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02-13-2006 07:02 PM  12 years agoPost 10
Rotor Tamer

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Benton,kentucky - USA

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Try This Link
Tower Hobbies has MX400 pinions 11T,12T,13T,14T
These should fit your X400.
[url=http://www2.towerhobbies.com/cgi-bin/WTI0005p?&I=HMXE0200&P=Z]

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02-13-2006 07:46 PM  12 years agoPost 11
Terry1229

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North Idaho

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Shaft size
Make sure you measure the shaft diameter of your motor, they are not all the same..

Thanks: Terry

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02-14-2006 03:01 PM  12 years agoPost 12
ARMSMASTER

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spokane, wa

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pinnion gears
Roto Tamer,
Just for your info. Tower only stocks pinnions that fit 3mm shafts. They do not stock 3.2mm or 1/8". The T-rex pinnions are an exact match as stated by others. They come in a package with several different number of teeth in each package. They offer either 3mm or 3.2mm assortment packs. The price is not bad and are a common Align part. I would agree that the 48p r\c car pinnions would not work long as the pitch of the teeth are not quite right. As someone else mentioned why take short cuts when you can get the real deal. Good luck on your pinnion serch.

Life is like a box of chochlates!

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02-14-2006 05:56 PM  12 years agoPost 13
Rotor Tamer

rrNovice

Benton,kentucky - USA

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pinnion gears
Armsmaster

Thanks for the info.

I got my MX400 from tower and I am new to Elect.Helis.

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