New FW- doorstop

[Max]

Re: New FW- doorstop

Do the replicas run ok on 22v? Would they be ok running in 24v as a spinner motor?

[Danjr1]

Re: New FW- doorstop

yeah, had no issues. get a little warm but thats it. I'd say give it a go as they are only £12 delivered on ebay! only thing might be that they have less torque than the real ones so you may have to reflect this in the spinner drive ratio.

[mattsdragons]

Re: New FW- doorstop

What gears did you use?

[Danjr1]

Re: New FW- doorstop

Modified 90t mod 1 spur and 12t pinion gears. All from technobots

[Danjr1]

Re: New FW- doorstop

Need a little advice if possible. I currently run a 2wd replica speed 900 wedge rambot, which is generally built from HDPE, but I'm flirting with the idea of resurrecting my 4wd four motor 22.2v rambot built entirely of 5mm steel. Not too sure whether to stick with HDPE speed 900 bot or go for a 4wd drill steel bot? Any guidance would be much appreciated!

Cheers

Dan

[plargen]

Re: New FW- doorstop

i used this website to calculate the weight of the the Armour for my 4wd that got 8mm steel round the sides but i had to use 3mm on the base and aluminium for the top plate to keep it in weight, and i just weighed the wheels motors etc and its about 12kg without the wepons

http://www.matweb.com/tools/weightcalculator.aspx

it was drill powered not speed 900

[maddox10]

Re: New FW- doorstop

Size of wheels? 100mm?

[Danjr1]

Re: New FW- doorstop

120mm diameter with bicycle tread

[Ellis]

Re: New FW- doorstop

I'd be amazed if normal drills would handle that. Ours destroy themselves with smaller wheels and lower voltage...

[maddox10]

Re: New FW- doorstop

Very fast machine then.

Unless you got a strange set Speed 900 replica's. What size of axle did they have?

[Danjr1]

Re: New FW- doorstop

Sorry, my fault! The replica speed 900 bot runs 120mm wheels on a 12mm axle. The drill bot would use 75mm robo challenge wheels

[maddox10]

Re: New FW- doorstop

I ment, what axle does the replica 900 have. There are 3 major types.

5mm, fast runners, ment for applications as battery-leafblowers and such.

6mm, speed 900 size.

6.35 - 1/4 Ment for car applications.

[Danjr1]

Re: New FW- doorstop

5mm output shaft. These are the replicas from ebay

[maddox10]

Re: New FW- doorstop

Fast runners then. 12K rpm @12V

@22.2V those want to run 22.2K rpm. With a gearratio of 7.5-1 the theoretical topspeed should be 71km/h, given time.

Unfortunatly, it will be something about 35 km/u, and the motors will run half speed, drawing more amps. Don't close of the vent holes, and maybe adding a small fan to keep the air flowing trough the motors at all times.

[Danjr1]

Re: New FW- doorstop

These are the ones some others and I are using:

http://www.ebay.co.uk/itm/12-v-ELECTRIC ... 45f7de0c88

I'm just unsure which direction to take?!