100 mph RC8 brushless

[speedracer1129]

Originally Posted by Rivermaxx

I assume those are the same gears are from sdp.si.com for about $8 each.Alsothe same ones KD uses and sells for ~$10. The only plastic or metal gears they sell are 20* pressure angle. Mod 1 has 3 different pressure angles and they are not supposed to be used with each other, At least thats what this link says. Not my info I am just relaying it. read it for yourself. http://shopswarf.orconhosting.net.nz/spur.html
" Three spur gear tooth forms are generally used with pressure angles of 14½, 20, and 25 degrees. The 14½ degree tooth form is being replaced and made obsolete by the 20 and 25 degree forms. Figure 1. illustrates these three pressure angles as applied to a gear rack with all teeth being the same depth.
The larger pressure angle makes teeth with a much larger base, which makes these teeth much stronger
and also allows the production of gears with fewer teeth. Any two gears in mesh with each other must be
of the same pressure angle. When gear tooth measurements are to be made with gear tooth calipers, the chordal tooth thickness and
the chordal addendum must be calculated."
The revo is 14.5 * and your gears are 20* They may fit each other because the revo gear has smaller teeth but it isnt exactly right like it should be. So a mod 1 is not a mod1 is not a mod 1. Sorry but these are the facts.

Interesting info!! I don't know what to say.......First, I don't know where you found the Revo spur info as I can not find it anywhere!! Second and most importantly I think, I don't think anyone here has ever had a problem mixing different brands of gears with each other. I say that because I am sure that different brands have different manufacturers producing gears and these discrepencies may exist between brands. So in short, I think you are looking into it too deeply. I can see this as a possible problem in a precision mechanism.....but a pinion/spur combo??? What I can say is there are bigger problems to worry about with a high speed car build than this! Good luck with the build!!

[Rivermaxx]

Originally Posted by speedracer1129

Interesting info!! I don't know what to say.......First, I don't know where you found the Revo spur info as I can not find it anywhere!!

14.5 * is writen right on the revo 36 tooth gear.

Originally Posted by speedracer1129

Second and most importantly I think, I don't think anyone here has ever had a problem mixing different brands of gears with each other.

I never said anything about mixing different brands of gears with each other either, I just posted a write up that says your not supposed to mix gears with different pressure angles with each other.

Originally Posted by speedracer1129

I say that because I am sure that different brands have different manufacturers producing gears and these discrepencies may exist between brands. So in short, I think you are looking into it too deeply. I can see this as a possible problem in a precision mechanism.....but a pinion/spur combo??? What I can say is there are bigger problems to worry about with a high speed car build than this! Good luck with the build!!

If you read the write up I posted ther are only 3 types of mod 1 gears 14.5* 20* and 25*. If one manufacturer makes a mod 1 20* gear it should match perfect to the other manufacturer 20 degrees mod 1 gear. 20 degrees is 20 degrees its a universal measurement I believe and there is no metric or foreign equivelent form of measurment for degrees .There should be no descrepencies between 2 20* mod 1 gears at all made by different manufacturers period. If there is, then one manufacturer is making them wrong. Yes it is just a spur and pinion the 2 peices that mesh together and all the power goes through. I may be looking into it too deep but thats just me I refuse to 1/2 ass something together and hope it works. If you still want to argue about the different pressure angles of gears dont look at me its not my rules. I am sure some dumb ass engineer with a phd thought of it just to screw with us and make things difficult . The biggest problem I had was tires and I now have that solved. My first goal is to break the current isc record of ~70 mph. Second goal is to break 100mph so well see.

[speedracer1129]

Originally Posted by Rivermaxx

14.5 * is writen right on the revo 36 tooth gear. I never said anything about mixing different brands of gears with each other either, I just posted a write up that says your not supposed to mix gears with different pressure angles with each other.
If you read the write up I posted ther are only 3 types of mod 1 gears 14.5* 20* and 25*. If one manufacturer makes a mod 1 20* gear it should match perfect to the other manufacturer 20 degrees mod 1 gear. 20 degrees is 20 degrees its a universal measurement I believe and there is no metric or foreign equivelent form of measurment for degrees .There should be no descrepencies between 2 20* mod 1 gears at all made by different manufacturers period. If there is, then one manufacturer is making them wrong. Yes it is just a spur and pinion the 2 peices that mesh together and all the power goes through. I may be looking into it too deep but thats just me I refuse to 1/2 ass something together and hope it works. If you still want to argue about the different pressure angles of gears dont look at me its not my rules. I am sure some dumb ass engineer with a phd thought of it just to screw with us and make things difficult . The biggest problem I had was tires and I now have that solved. My first goal is to break the current isc record of ~70 mph. Second goal is to break 100mph so well see.

Riv,

I think you overshot my comment. All I meant is that Traxxas may use 14.5*, Mike may use 20*, Kyosho may use 25* yet plenty of us have intermixed these with no real issues because the only factor we look for is matching pitch between gears. This is NOT a pssing contest!! You have the right to go about it how you please but I think everyone can agree with me.........The simpler you keep it, the more fun it stays!!! Good luck and hope to see you at 100+!! I already have the t-shirt....