6 tooth pinion install

[Mnster]

Cause look at the tooth between the teeth. Thats right, one tooth.

[Fishmaxx]

I trust you

Guys, look at the gears relative to how the force is applied.

[Kamikaze]

Hey, I will be thrilled to be the only one with these pinions.

[Fishmaxx]

I am no engineer, but isn't the force being applied here when the pinion is turning counter-clock wise ?

[Kamikaze]

Thats what I've been saying.

[cars69]

I run a 6 tooth on a 45turn lathe motor in the rear and a 8 tooth on
55 turn lathe on the front on my Stick chassis. It seems to cut down
some of the clod stall. Where I have noticed the big difference is on
a steep down hill the rear has a slite drag and it gives you a lot more
control. I still have all the wheel speed I need with this setup. I am
running metal gears. Time will tell, but for now I like this setup.

Rick

[JasonInAugusta]

Looking at it I can see where the "one tooth" idea comes from...and I agree.

There are two actions going on here. The gears have to engage one another and they also have to release.

Here's something that might help:

The most important factor to consider is the angle of rotation of the two gears during the engagement of each tooth. Especially since the angle of rotation is greatest for the pinion. As the pinon gear pushes the input gear teeth beyond the mid-point of the engagement, there are power losses caused by differences in vector forces between the two gears.

The more teeth there are on the pinion gear, the smaller the angle of rotation of the two gears during the engagement of each tooth. This should be quite obvious since the angle occupied by each tooth in a 6 tooth pinion is 60º, whereas it is only 12º in a 30 tooth spur.

Compare it to a 12 tooth pinion: A 12 tooth pinion is much stronger because two teeth are engaged at all times (the mid-point of engagement of the next tooth is reached before the first tooth is released).

The engagement of two gear teeth should be seen as two stages, engaging and disengaging. There is much more friction and power loss during engagement than during disengagement, so the teeth must be designed so that the tooth of the pinion is not released until the next tooth has reached the mid-point of the impulse. This is why the teeth of the larger gear extend beyond the pitch circle.

Think about the effect of releasing the tooth of the spur gear before the next tooth is engaged. The next tooth is receiving the force of the tooth of the pinion gear as it engages more deeply into the larger tooth, having a repelling effect and a grinding effect (the gear teeth are grinding into one another).

I'm interested to see how these work in the long term.

[Highmark]

IMO he'll be fine. The wanna-be engineer side of me screams "nooo!" but the redneck who plays with toy trucks side of me says that the pinion/spor gear is so far up the gear reduction scale it should be alright.

It's always been my experience that I've stripped counter gears and brass hexes before and of the spors suffered damage.

[JasonInAugusta]

Same here. Should work great, but I need the wheel speed.

I'm just wondering how well the input gear will hold up over time.


Keep us updated!

[Grizzly4x4]

Originally Posted by Kamikaze

I am looking at my axle right now, at any time there are two pinion teeth and two plastic teeth touching. I beat on it today for an hour, still works good.

Also there are two teeth touching in this picture, why doesn't anyone beleive me???? I mean, does everyone that is disagreeing with me have 6 tooth pinions right in front of them??????? I guess I wouldn't be able to tell. THEY WORK FINE

At some point during the rotation it looks like there will be pressure applied on only that one "spur" gear tooth. If the motor was rotated a little more.

I (and I think most of the others) am not criticizing you for trying them and we're not saying they wont work. We're just curious to see how well the teeth hold up since from an engineering point of view the design is less than optimal.

[CSR]

It'll never work!

I'll be happy to take that junk off your hands the next time I see you, to save you from ruining your spur gears....

How's Momma and Lil' Kamikaze doing?

[Badd]

He has all kinds of wheel speed . He is running custom hand wound motors . I have drove COPPERHEAD and the wheel speed was nuts with the 8 or 9 tooth he was running but was still controlable and some tourqe . but now it has got to be BaddA$$

[Kamikaze]

Originally Posted by CSR

It'll never work!

I'll be happy to take that junk off your hands the next time I see you, to save you from ruining your spur gears....

How's Momma and Lil' Kamikaze doing?

She's doing great, were almost half way, should find out what it is in a couple of weeks.

[Jaydee]

You guys crack me up sometimes. You will spend $100's on parts but whine because a gear might wear out faster with 6T pinions. The gear set is only $8.00. The benifits of lower gearing will far out weigh spending $16.00 a set every now and then for some new gears.

[Kamikaze]

Amen brutha

[JasonInAugusta]

Originally Posted by Jaydee

You guys crack me up sometimes. You will spend $100's on parts but whine because a gear might wear out faster with 6T pinions. The gear set is only $8.00. The benifits of lower gearing will far out weigh spending $16.00 a set every now and then for some new gears.

You're missing the point.

Everyone that is worried about gear mesh is concerned about durability and trusting them in comps.

Time will tell with these pinions.

[Jaydee]

Originally Posted by JasonInAugusta

You're missing the point.

Everyone that is worried about gear mesh is concerned about durability and trusting them in comps.

Time will tell with these pinions.

I know what they are saying. If you are in comps anyway you want the best ability you can get. If the gear wears before the comp is over get a metal gear to replace it. Providing it works out ok...

I see they got a 7 tooth pinion as well. Maybe a better choice.

Keep reporting! Would like to see these in a super crawler with big sticky tires and see what damage can be done.

[Kamikaze]

So I went to the rock quarry today and the control I now have is awsome, the wheels don't move unless I tell'em to. And I did have some mechanical falure that involved the pinions.... the pinions crazy tourque!!!

[Kamikaze]

That was a stainless steel axle, but amaizingly the pinion and the counter gear are in great shape.

[JasonInAugusta]

Sweet.

The old equation still works:

Torque x Traction = Broken Parts