MaxSp97

iTrader: (5)

Pinion 64P is working fine with Tamiya spur 0.4

akura2

Are you sure?... I've never tried it... and I haven't heard of anyone else trying it...

I thought the Tamiya gears were closer to 48p

MaxSp97

iTrader: (5)

I used on my F103/F104

PDR

iTrader: (31)

There are two commonly used Tamiya pitches. The 04 module parts (as supplied with the F104Pro kit) are very, very close to 64p, but not quite. You might well get away with it, but with increased wear rate. I think the difference is less than 1%, but still there.

The other one they use is nowhere near 48p or 64p and commonly used on the more mainstream kits such as TT-01, TA05 etc.

akura2

I wonder why Tamiya didn't just go with 64p if they are going to get THAT close....

As a matter of fact... Why did Tamiya go with a diffrent gear pitch than ANYone else to begin with?

PDR

iTrader: (31)

Because they can? Don't know the real reason, but I suspect it's got to with it being a pure metric approach: the 04 module stuff is 0.4mm pitch (~63.5p). I think the other ones they use are 0.6mm pitch (42.3p)

Phil.

Metla

They use metric, as do most of the world, apart from the USA who stick to Imperial which is vastly inferior.

It would be madness to mix metric and imperial components in a manufacturing context. Its bad enough in my spare parts box which has accumulated trillions of items from both Japanese and American cars over the last 2 decades.....Even the damn grub screws are different....

Smokem Racing

Yeh I think Tamiya has been using metric gears for a long time. It just so happens that 0.4 module is very close to 64dp.

fat500

iTrader: (51)

Because if the rest of the world does it oneway...we do it different.
I think it is more about marketing here in the states.
metric IS the world standard.....heck..even star trek uses the metric system
I use what ever is easier for me to find
anyone want to buy a hugh bag of 64p pinions? I will put up some pics later

fat500

iTrader: (51)

@metla...that whole grub screw thing makes me crazy too

Promarkt

64 pitch pinions work fine with the 0.4 Tamiya spur. I think the tolerance in manufacturing the pinion will probably account for more variance than the negligible difference in actual pitch. In fact, some of my pinions are 64 and some are 0.4 so depending on my roll-out, I’m going back and forth with the two different types of pitch with no issues. The car always runs silent and my spur lasts a very long time.

BP SHADOW

iTrader: (24)

Here is my 104, just about ready to go to the track, as seen through the awsome lens of John Discher (DISH) there will be more images later, but here is a preview.

heretic

That's what AE did with the 12R5 nonetheless... thats understandable given their 1/12th inheritance but still quite strange IMO

Arthur Burns

iTrader: (1)

This is good to know. Thank you. Even if there is more wear, it might be worth it for the flexibility you gain. Spur gears are cheap, and I can find those pretty easily in 1 place and order a bunch up front.

Torrance-96

a gear's pitch can be calculated or converted like inches and millimeters. to go from Diametral Pitch (DP) to Module, just take 25.4 divided by the DP to get the Module equivalent. to go from Module to DP, take 25.4 divided by the Module to get the DP.

so for example to calculate the module equivalent of a 64DP gear, take 25.4/64 and you get 0.397 module --> close enough to a 0.4 module in my opinion (less than 1% difference). like dave jun mentioned, that falls within manufacturing tolerances. it's not like these gears are going into a fine swiss watch or anything like that.

the other common gears are 0.5 module and 48DP. if you take a 48DP gear and apply the conversion factor you get 0.529. this is a 5.8% difference so i'd say these two are not compatible.