Drills

bit of a question regarding drills, for an upcoming beginning class in australia the robots have to be mostly MDF, so im making a horizontal crusher and was wondering -

ive got myself a 12v cheapy drill modified with a piece of m10 threaded rod on the shaft. ive seen a few european robots employ a drill as a crusher so if anyone could provide me with some details as to how much force i could expect from such a drill actuator that would be great (any pictures would be appreciated too)

I tried a similar thing for a lifting arm Glen but used an M8 thread instead of an M10. I was able to lift my bed with it on a direct one-to-one ratio. I dont know what weight my bed was but I was able to achieve a similar effect by using a wiper motor and a length of chain (rack and pinion style) so Im assuming that was roughly 24kg. (might have been more, might have been less). Theres a pic on my profile which I found on the Featherweights.org forum a couple of months back. Its a vertical crusher using a drill and some M8 rod. I dont know the name of the robot or who built it but looks as though it would be fairly effective so there may be a fair amount of force attainable for a horizontal crusher.

Lenny

The guy nicknames himself JHQ :) Ill get him to come on the forum

hiya lenny, the name of the robot is Loisteputki and it was built by me, the crusher had 120kg of force.. over that force-- one more burnt drill, so it was not a good solution. unfortunately i have lost a pic of it, ill see later on if i find one..

Hey I tend to archive robot combat pictures off of the net I estimate about at least 2,000 and a quick search found a few of Loisteputki.....

http://home.ripway.com/2004-1/52908/...kyljellaan.jpg

thanks guys, what would you say 120kg was capable of breaking? polycarb of any thickness?

im looking at getting my hands on a kiddy car gearbox as i gave my old one away dammit so a drill for now, just have to go easy on it :)

If you get a drill with a torque limiting system on it you could use that to protect the motor from stalling and burning out couldnt you.

Richard Wenman
Team Mayhem

that sounds about right, the stock ones wouldnt do it though, even on the highest setting it slips fairly early. im sure you could emulate it using a ball bearing sitting underneath a grub screw.. thats a good idea actually.

btw heres the little project ive been working on. its a cut down drill for a crusher in a beetleweight robot, im looking at cutting a keyway into the rear of the shaft and then screwing a nut onto the front. it makes the setup far more smaller ,lighter and reliable IMHO with the keyway.

http://photobucket.com/albums/v357/Cobrarobotics/Beta Max/?action=view&current=DSC01880.jpghttp://photobucket.com/albums/v357/C...n=view&current =DSC01880.jpg

i didnt test it on polycarb as i didnt have any of that stuff.. worked great on tincans and 15mm wood! i think i got the bent can or some pics of it somewhere, only if i could find those..

btw, my ex-teammate made some nice aluminium housings for drill gearboxes:

http://www.kolumbus.fi/rex/image/Uusi%20_aatikko.jpghttp://www.kolumbus.fi/rex/image/Uusi%20_aatikko.jpg
http://www.kolumbus.fi/rex/image/Vaihdelaatikot.jpghttp://www.kolumbus.fi/rex/image/Vaihdelaatikot.jpg

used them on loisteputki and few more robots, zero failures in around 15 matches + many hours of testing with them, i would machine some of them for me but i dont need them as i got some nice 1½hp+ drills for free.. :)

Wow, its Glen! Hey man, good to see you are alive. I seem to have found my way over to this forum and let me tell ya, yall over on the other side of the water build some nice stuff! Different, but really nice. I hope that I will be able to bring some ideas into my bots and maybe give some pointers to you guys. I seem to be a noob again. Awwww, LoL!

finally finished the crusher, thought id share it with yall :p

heres a video of it crushing - http://ffej.ath.cx/first_test.wmvhttp://ffej.ath.cx/first_test.wmv

and some pics

http://photobucket.com/albums/v357/Cobrarobotics/Woodzilla/?action=view&current=DSC02228.jpghttp://photobucket.com/albums/v357/C...=view&current= DSC02228.jpg

http://photobucket.com/albums/v357/Cobrarobotics/Woodzilla/?action=view&current=Jawdown.jpghttp://photobucket.com/albums/v357/C...=view&current= Jawdown.jpg

http://photobucket.com/albums/v357/Cobrarobotics/Woodzilla/?action=view&current=Jawopen.jpghttp://photobucket.com/albums/v357/C...=view&current= Jawopen.jpg

it only has about 45kg of power at this stage as it seems to keep on binding up, but its only a 9.6v drill at 12v. i thought a 12v at 24v drill might burn out.. needs more power... and friction on the threaded rod seems to be a real problem at this stage. might have to move onto a scooter at 24v..

oh yeah and as for mounting wheels onto drills heres a different idea, take the chuck out of the drill, cut it up, then press it into a wheel and use the 3 forks to stop the wheel rotating, i glue them in on the rear of the wheel. works perfectly.

http://photobucket.com/albums/v357/Cobrarobotics/Woodzilla/?action=view&current=DSC02209.jpghttp://photobucket.com/albums/v357/C...=view&current= DSC02209.jpg

Well done Glen ive been watching this develop on the RoboWars web site, I really like the bot as its making me want to try one again, if only I could find the time. Also have you tired to see if the claw will act as a scrimec because I dont think im seen any mention of that feature?

Chris - ^_^

Cool looking robot there Glen, I remember trying to make a claw mechanism using a drill a while back but had a few problems with it so I just decided to get a linear actuaor instead. Liking the shape of the robot/claw mech as well - makes a change from all the Razeresque claw weapons that Ive seen. :)

Lenny

P.S. The video wouldnt download/open for me so I havent seen the crushing mech in action yet, but what sort of stuff have you been able to crush with it? Just curious as to what 45kg of crsuh can do.

Great bot you have there Glen , i have been following Woodzillas build for a while and it looks like like a great bot ! I was able to download the file and i but it on putfile .
http://media.putfile.com/Woodzilla-Robot-Test-http://media.putfile.com/Woodzilla-Robot-Test-

Force X Prototype from 3 years ago (300Kg crush, 2 seconds close time, 12v)

http://www.teamstorm.com/feathers/forcex/DSCF0022.AVIhttp://www.teamstorm.com/feathers/forcex/DSCF0022.AVI

However, new featherweight crusher currently being built by Team Storm, 2 tonnes at the ram :)

Nice design though, like people say - different from the traditional Razer crushers !

Ed
http://www.teamstorm.comhttp://www.teamstorm.com

hey all, finally got a chance to finish up the crusher part of this robot amidst constructing 3 other feathers lol.

heres a bit of a revised video http://glen.botclips.net/Woodzilla test%202.wmvhttp://glen.botclips.net/Woodzilla test%202.wmv thats about 115kg of power at the moment on a 9.6v drill @ 12

interesting how much friction limits the power. so much force is wasted through the friction in the threaded rod and quite a was lost when the jaws would sort of push apart when crushing.

might try 24v now lol. gotta know where the limit is.

ed - very nice :D looking fowards to seeing a destructive weapon that isnt spinning

hi
in robots is it viable to use corded drills in robts? or rather their insides?

is yes what sort of speedos etc. would you need to make it work well?

cheers alex

250v AC Corded Drills....NO

99.9% of all corded Alternating current drills use a series wound motor. You can give this kind of motor direct current on lower voltaged. And they will turn. But unless you go up to 100V DC, the amount of power youll get out of this motor is feeble. like a 12V fan that runs on very dead batteries. Even a drunken fly with broken wings will stop it.