Speed 900-gear ratio

[psycho_fling]

hi all

for my crusher i now want to use 2x speed 900s, running on either a 25a abertooth or a scorpion xl/xxl-all running off 21v

however i would like to know a suitable gear ratio to use, in order to get good speed and high pushing power

any info/ help welcome

thanks alex

[maddox]

Speed 900-gear ratio

Depends on wheel size.

Let us take a 80mm Colson as the wheel.

@21V the Speed 900 runs 11550 rpm.
Aimed for speed is 20km/h

gives me a 9 or 10 to 1 gear ratio.
Youll end up with a 2 stage gearbox.

With a 8-1 gear ratio youll get about 24km/h

[psycho_fling]

Speed 900-gear ratio

i was looking at using either 100mm wheels or 75mm ones

[maddox]

Speed 900-gear ratio

Simple calculation then.
1-10 ratio on a 100mm wheel gives 21 km/h
1-8 ratio on a 75 mm wheel gives 16 km/h

[psycho_fling]

Speed 900-gear ratio

so i can use the 100mm wheels? matt said they would be to big

by the 1-10 ration i would need the gear on the motor shaft to have 10times less notches on correct?
such as 5 and 50?

thanks alex

[maddox]

Speed 900-gear ratio

Aboutish.
But I doubt you can find a 5 teeth gear to fit on a 6mm axle.

[beast]

Speed 900-gear ratio

just go for the smallest T gear u can find and then the biggest size which is nearest the size off wheel if u want a 1 stage reduction

then guess the ratio and speed

[psycho_fling]

Speed 900-gear ratio

is this the right sort of layout?

the page should work (i hope)

http://psychoflingteam.piczo.com/robotimprovements?preview=y&cr=5http://psychoflingteam.piczo.com/rob...preview=y&cr=5

also where do i buy the gears from?

thanks alex

[leorcc]

Speed 900-gear ratio

Your Example is a single stage reduction, with 21V that will be really fast. We use a single stage with speed 900s, but on 12V and even then if we dont put our armour on it pulls a wheelie every time.

http://www.computerclub.nl/uploads/msrconcept.jpghttp://www.computerclub.nl/uploads/msrconcept.jpg

You can find gears in several locations, one of them is RS Components.

http://uk.rs-online.com/web/http://uk.rs-online.com/web/

[maddox]

Speed 900-gear ratio

We have driven the Hannibalitos with dual rate, so the voltage supplied to the motors was less than 6V, and still they are fast and fast accelerating.

[typhoon_driver]

Speed 900-gear ratio

I get my gears from technobots but if they dont have what i am after then HPC gears always does. Bit more pricey but the service is very good and you can get them to carry out various machining operations (at cost) on your gears.

[psycho_fling]

Speed 900-gear ratio

ok so i just had the size of gears the wrong way around?

[leorcc]

Speed 900-gear ratio

No i think it was right. Small gear on the motor, large gear on the wheel. it is a reduction, not an accelation you need.

[psycho_fling]

Speed 900-gear ratio

hi leo could you reply to the email on my profile with your reply to my pm i sent to you?

thanks alex

[psycho_fling]

Speed 900-gear ratio

just had a thought probably wont be suitable but, are there any tools which contain suitable gears which could be salvaged?