A little disappointed you didn't go for a glow engine
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A little disappointed you didn't go for a glow engine
I have a very nice Novarossi Benito to go in it however tests in our factory proved way too fumigating. Plus having an engine being warmed up in the pits to 110 degrees c could be problematic.
Regarding the magnets Sam I may try and get one in but there's just no room lol. Literally struggling to fit a servo in to drive the head mount lol.
Thanks so much for the kind comments really spurs me on to get it completed. Just completed one of the lipo battery holders. Next it's the head tilting mechanism tomorrow. Pics to follow
Working on the head tilting mech.
Starting to machine the servo pivot mount here from Aluminium
Just finishing off the mount
Voila! Servo tilt mount complete with bearing for the threaded bar.... Notice any mistakes...
Even the mistake looks pretty!
You mean, weight saving ;)
Cheers guys,
Here im modifying the thread ready to fit into the gear and bearing
The square nut has the threaded bars welded into position to bolt to the head cradle
Head cradle tilt pivot attached... hopefully it will be strong enough to take the impacts?
Both gears modified, one ready to weld onto the thread and the second gear has been machined out to fit onto the servo horn.
Well all is complete! the head tilt mech is finished and in the machine. Its extremely tightly packed. Need to find a new home for the scorpion esc now. Head is almost full retracted here.
And here is the head fully forward, you can see most of the head tilting mech here.
Next job is the arms mech and creating the single tooth for the head. Then its armour up time and away we go!
the picture mentioned doesnt seem to be there??
all looking great :) nice work
Here we go, thank you very much.
very cool :proud:
looks brilliant, is the tilt mechanism like an actuator?
Oh I see what you're doing! You've a gear on the servo head, which engages a gear on the threaded rod. The thread on the rod then pulls and pushes a nut which is attached to the head?
Does the servo have enough travel?
Yes your right PJ, I've modified the servo so it continuously rotates. It has 14kg or torque and rotates once in 1.08 seconds so it's slow but that means we can keep it very controlled.
Neat idea! How are you limiting travel? The idea of using switches seems too flimsy in a combat robot.
cheers PJ
We will be using our eyes and control finger instead of limit switches :)
there will be physical stops on either end too.
Been working on the arm mechanism this last week. All the bit have arrived including my nice little ball screw :)
I really wanted to work the arms off a drill motor as they are nice and easy to replace and can be put under good strain with out burning out when used at the normal voltage. Only snag was its too big to fit in the robot so I set about making the gearbox smaller.
Machined out gearbox is as short as I could make it. finger crossed it fits!
Machining out the drive gear for the motor side
Hey presto! finished motor mount/gearbox with modified shaft and arms drive gear.
The motor is as short as I can make it however looking at the drawings its about 10mm too high to fit in. The shoulder mount supports and the tail servo will now be cut out and modified to fit the arm mech :( bit of a set back but should be ok once its done. I just hope the drill motor is enough to self right otherwise the toys may come out the pram.
Gearbox looks sweet James, What ratio did you go for in the end? Isnt it worth putting an astroflight on there?
Ye i was tempted but with how expensive they are and easily it is to burn them out under high prolonged stress I thought it better to get with something cheap. Its the gear out of a drill gearbox so the same ratio as before.
Wouldn't a couple of big servos cut it?
Sorry to say it James, but when you put this into full combat, if it breaks, you're going to cry so hard. :P
you could use 5th scale metal gear servos?
looks great :)
Servo's don't have enough speed and torque, needs a lot!
yeh i suppose :)
Started to machine the arm mech mount until the mills shaft bearing locked up! Nice....
Had to clock it up in the manual mill and finish it by hand. This is how far I had got.
Machined the inside section now im band sawing the excess so I can machine the bearing pockets in the top and bottom
Back in the mill and Ive just pocketed out the bearing pockets. Our digital read out has a nice function where you tell it the diameter of the pocket and the tool and it calculates each of the individual xy coordinates. very handy!
Machining some of the profiles
Clocked up again to drill out the pivot holes
Machined all the back off to release the part from the block and now im just finishing some of the profiles.
Voila! arm mount mech complete finally. I just need to finish off the ball screw and drive motor then its ready to test the arms :)
looks good!