Joined: 15 Jun 2004
Posts: 696
Location: Sydney, NSW
Not sure if you already know this or not Nick. But there was a UK heavyweight called mousetrap that funnily enough was a giant mousetrap. With a spring powered trap mechanism that did 2/5's F#CK all damage.
Here's a pic of it half done
Mon Oct 29, 2007 9:49 pm
Nick Experienced Roboteer
Joined: 16 Jun 2004
Posts: 11802
Location: Sydney, NSW
That's hilarious! _________________ Australian 2015 Featherweight champion
UK 2016 Gladiator champion
Mon Oct 29, 2007 10:51 pm
Daniel Experienced Roboteer
Joined: 30 Aug 2005
Posts: 2729
Location: Gold Coast
Mousetrap didn't use a spring. The blue coil was just cosmetic. If you have a closer look you will see that there are two pneumatic rams that pull on chains that are attached to sprockets on each side of the trap. The weapon failed during Robot Wars because the chains snapped.
http://uk.youtube.com/watch?v=ulYCrOc6DOg
Its small but not the smallest but it is user friendly and a lot of the weight is in the rotor (pulley) part that can act as the flywheel.
The hub/armature/shoe is directional so it’s best to set it up so the springs are in tension.
There is a nice beefy aluminum casting to attach it to the frame of the bot and a large stump of the center shaft is accessible to weld/bolt the flipping arm to.
I would expect you would be thinking of some sort of spring/bungee return mechanism.
The rotor could be spun up via a belt or possibly direct driven from the armature end by making up some sort of drive shell to clear the armature and connect to the rotor.
If you wont to direct drive one there is another type that is easier to set up that way [XF ford] but I don’t currently have one of them.
They don’t grip as well as the one I am sending.
PS
Remember to put a diode across the coil. _________________ Satisfaction is proportional to effort and results.
Wed Oct 31, 2007 5:32 pm
assassin
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
Well isn't that a nice post to read after a long hard day @ work. That information is even more helpful than the clutch itself(which is extremely helpful). Thanks heaps Gary... um.. yeah.. I'll see what I can do . _________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Wed Oct 31, 2007 6:01 pm
assassin
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
The clutch is great, thank you. Its all apart @ the moment and I've tested a few things. I would like to know how to remove the shaft if you know, is it pressed in or does the bottom cam bit unscrew.
_________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Mon Nov 05, 2007 8:57 pm
Rotwang Experienced Roboteer
Joined: 15 Jun 2004
Posts: 1589
Location: Vic
Yes the shaft will press out in one piece, the big bearing is staked so you will need to re stake or lock tight it back together.
There is a counterweight and seal underneath that can be deleted once it’s apart.
Less weight and friction:)
The 2 taped holes that you can see are the boltholes for this other counterweight. _________________ Satisfaction is proportional to effort and results.
Tue Nov 06, 2007 8:06 am
assassin
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
I have a large pulley puller here, so if I press the shaft from the top and out the bottom? The top being the small bearing. _________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Tue Nov 06, 2007 4:45 pm
Rotwang Experienced Roboteer
Joined: 15 Jun 2004
Posts: 1589
Location: Vic
Yes that will work nicely.
The seal comes out the small bearing end after removing the small bearing; just tap it out gently with a suitable drift from the big bearing end. There is another circlip holding the seal. _________________ Satisfaction is proportional to effort and results.
Tue Nov 06, 2007 4:52 pm
assassin
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
Done! Thank you. _________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Tue Nov 06, 2007 5:26 pm
Rotwang Experienced Roboteer
Joined: 15 Jun 2004
Posts: 1589
Location: Vic
Hi sorry I didn’t notice your PM till yesterday.
You guessed right; V6 commodore.
They are called Poly-Rib belts and most cars run them nowadays.
The part number on the belts goes number of ribs e.g. 3 P for Polly Rib K is section then length A 4PK600 is the shortest automotive listing.
Probably the easiest pulley to get for the drive motor would be a car alternator pulley.
If you try an auto elec you might get one for nothing or I can post one. You might need to machine up a bush for the center hole or weld it and re drill it. 17mm as it comes.
55mm diameter _________________ Satisfaction is proportional to effort and results.
Wed Nov 14, 2007 5:57 pm
assassin
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
Great! Thank you. I Like the part that says "I can post one" _________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Wed Nov 14, 2007 6:33 pm
Rotwang Experienced Roboteer
Joined: 15 Jun 2004
Posts: 1589
Location: Vic
No worries I will try to get to the post office first thing tomorrow.
Got a nice shiny one ready. _________________ Satisfaction is proportional to effort and results.
Wed Nov 14, 2007 6:49 pm
assassin
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
What do you think the max RPM is that the clutch will work @? Also which way does the clutch/spring go/rotate _________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
Thu Nov 15, 2007 9:20 pm
Rotwang Experienced Roboteer
Joined: 15 Jun 2004
Posts: 1589
Location: Vic
Clock wise, as for revs in this application dont know. _________________ Satisfaction is proportional to effort and results.
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