Cherubim

[craig_colliass]

Another HW project I have been working on for some time, I Hope to make it into an electric lifter won't do much damage to other robots, but should be fun to drive something with a front and back; a top and bottom for a change as the Saint dose not really have that!

[Ellis]

Re: Cherubim

Looking evil, so far it reminds me of Switchblade from RW Extreme Destruction. :P

[Mouldy]

Re: Cherubim

looks nicely built Craig, is the lifter going to be part of the wedge or come up and over the top and be by the wheels?

[craig_colliass]

Re: Cherubim

Thanks

You can see in this picture the bearings at the front with the large spur gear the shaft 30mm diameter will turn the lifting arms 360 degrees so it can be used to self right the robot and do tricks.
They may look a bit like horns

[craig_colliass]

Re: Cherubim

Another pic showing the basic shape and the lifting arm shaft position, and cardboard from a Pizza box

[razerdave]

Re: Cherubim

Where do you get those gearboxes from ? I've seen them in tilly as well, they'd be useful for a robot like mine

[craig_colliass]

Re: Cherubim

Hi they came with a job lot i bought and have a 10:1 ratio. they are ok but i have supported the wheel drive shaft with a 30mm dia cast steel bearing block to prevent any dammage.

[craig_colliass]

Re: Cherubim

Most of the armour is done just a few bits to do

[George_TeamZog]

Re: Cherubim

Jeez you're gonna have as much as andy now...

[craig_colliass]

Re: Cherubim

I don't think I will be taking two heavyweights, two featherweights and a mechaniod walker to every event; I may need a bigger van!

[craig_colliass]

Re: Cherubim

Wiring up the lift motor, the motor is having the integral break fitted it is 24v the break is 12vThis seams daft to me but that€™s what it has got!


The hub that will have the lifting arm on is a taper lock unit from Technobots.


The hardest thing to get right on the spur gears is the shaft centre distance so they mesh right I fluked this.

[craig_colliass]

Re: Cherubim

Fitted lifting forks

[craig_colliass]

Re: Cherubim

I ran the lifting mechanism this week I found the arm moved a little too fast and did not have the lifting power I was expecting this is the trouble when you use a motor from the scrapheap with no readable data plaque.

The drive ratio in total is 187.4999/1 this is not enough even though the lifting forks are only 300mm long. :shock:

So the spur gears are going, and a two stage chain drive will be fitted to get the ratio down even further to 583.33/1 this will probably be a bit too slow 5 seconds for a 90 degree arch, but from here I can increase the speed easily.

[RogueTwoRobots]

Re: Cherubim

Five seconds for 90 degrees lift should be alright Craig. By the time you've wedged the forks under an opponent and lifted for, say, one second, the chances are that your opponent's wheels will be off the ground and they'll be unable to drive away. You can then take your time and use the rest of the lift travel to tip 'em over
Looking good by the way.

[craig_colliass]

Re: Cherubim

Sprockets have arrived and are being machined next week hopefully.

Painting bits I hate this job the main chassis has lots of holes drilled for different things and every one traps the paint and when you are not looking starts a paint run.

Silver hammerite for the inside and blue smoothrite for the outside.

The new ratio will be 466.6666/1 this works out at about 4 seconds for 90 degrees. Should be ok.