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Nick, 90 Degree postion. you mean falling from vertical, the original Xterminator style?
Not what I had planned. 180 degree.
and yes, I need this Axe to self right. without going 180 degrees it cannot self right and theres nowhere else in my design (on profile) for a schrimech.
The figures arent too good for using a gold im afraid. Youd only get about 11mph speed on the axe if the arm is 320mm long and has a tip torque of 13kg (using 18:1 ratio). It really depends on the robot shape to if it will be able to self-right at say 10kg torque at the tip.
I knew that from the start, I just didnt want to admit it.
It would be better if I used Pneumatics but I have no idea how to implement them into a feather.
The figures for an old-style 18v DeWalt drill motor are far better though (available from the US - http://www.robotcombat.comwww.robotcombat.com or http://www.teamdelta.com/products/prod5.htmwww.teamdelta.com/products/prod5.htm). If you brought the matching gearbox (maybe the kit from team delta which includes a mount) then you could get 34mph hammer speed with 14kg tip torque if you use it in low gear geared up by 1:2.
Sorry Ceri, I meant if you have an axe with a 180 degree swing. Using the same ratio as a variable ratio axe system should have at about 90 degrees gives you a fairly decent ratio for a fixed ratio system.
Im afraid Ewans right about the power, a DeWalt or EV warrior is a lot more powerful but of course you have to up-rate everything else to get the best out of it.
How much torque you need to self-right is fairly dependant on robot length, the shorter it is the easier it gets.
Going up to 36 volts from 24 increases the available energy by about 70% if that is an option.
Thanks for the advice on motors but the reason I chose the gold for the example was because I could get it easily in Britain.
36V isnt an option. I have 24V 1.2AH Drill batteries, of which I dont know is gonna be enough anyway... Unless you fancy bending the voltage rule for 48V theres not much of an opportunity...
Length, will be easy what with it being essentially half a cone. It cant be longer than it is high.
BTW. Im getting ~19Joules for the swing with just one set of 1.2Ah (Nicads?) at 24V, thats about a 17MPH hit. It is very nearly as much at 18:1. This is neglecting motor inertia and friction.
Hi guys,
With an electric axe you should be relying on the weight of the head more than the speed its traveling at, thats not to say speed isnt important !
If youre after a good motor,go to your local scrapyard and look under the bonnet of a peugeot 405 ,the radiator fan motor is as good as a EV Warrior, and cheaper.
Progress on my feather hammer is slow but sure,i hope to have something driveable for RAF Fairford.
Pic on profile
:)GORD
koooooool... looks evil
Cool. Reminds me of Beta.
Actually it was torque I put above speed as I understand the sums better...
lol
Ill consider the radiator motor. Since Bosch made the EVs, (to my recollection) any similar motor should be reasonably the same. same logic as - It it aint broke, dont fix it.
Hopefully I would like to fight your hammer bot with my Axe bot but I would warn you Im planning around weapons on a vertical axis.