Flywheels achieving linear motion

[mechanicalbrain]

What I want to do is take a 2' bar and move it 1' forward with a ton of force. Yeah I'm looking at using a motor with roughly 100 rpm. My goal it to be able to puncture 1/10" to 1/8" steel. Right now its part of science fair project for centripetal motion but I also am doing this to really learn about flywheels... oh and eventually im going to apply it to a Battlebot

[Rickertsen2]

Originally Posted by mechanicalbrain

What I want to do is take a 2' bar and move it 1' forward with a ton of force. Yeah I'm looking at using a motor with roughly 100 rpm. My goal it to be able to puncture 1/10" to 1/8" steel. Right now its part of science fair project for centripetal motion but I also am doing this to really learn about flywheels... oh and eventually im going to apply it to a Battlebot

Maybie you could have the flywheel coupled to a rack and pinion via a clutch of some sort. It seems to me that somewhere i have seen some electric clutches.

[greencactus3]

Originally Posted by mechanicalbrain

What I want to do is take a 2' bar and move it 1' forward with a ton of force. Yeah I'm looking at using a motor with roughly 100 rpm. My goal it to be able to puncture 1/10" to 1/8" steel. Right now its part of science fair project for centripetal motion but I also am doing this to really learn about flywheels... oh and eventually im going to apply it to a Battlebot

100rpm isnt enough info. my cellphone vibration motor can be geared down to 100 rpm and my truck can also run its wheels at 100rpm.
and 2 feet bar to move it 1 foot?
the lighter the "ram", the more speed it will gain. but well. less mass.
will it just be a bar? or sharpened?
andas for going into battlebots. i would just use the flywheel itself as the weapon rather than add extra stuff which will be less efficient.

nother idea... with not exactly a disk but maybe a disk with large "bars" coming out as the flywheel.. and then somthing moves the "ram" into contact with the flywheel bars. so the bars crash into the back of the ram and it flies forwards. the cool thing about this would be multiple shots.

or just friction on the edge of the flywheel touching the ram. i had a foam dartgun that worked on this priciple a long time ago. although it had 2 flywheels. on on each side of the dart.

[KenWittlief]

you need to start working out the physics equations for this: Force, energy, power...

if you want to puncture 1/8" steel the rod only needs to move about 1/4", right? The idea you are grasping at is getting all the energy from the flywheel into the 1/4" movement of the punch

work out the physics: a 12" movement with one ton of force the whole distance takes 48 times the energy as a 1/4" movement with one ton of force.

[Rickertsen2]

Originally Posted by greencactus3

100rpm isnt enough info. my cellphone vibration motor can be geared down to 100 rpm and my truck can also run its wheels at 100rpm.

Why is 100 rpm not enough? depending on the design of the flywheel, 100rpm could be more than enough. How much energy would be contained in a planet spinning 100rpm!!!!!

[Andrew Blair]

Ah, I've got an idea! You could just use the HotWheels priciple. Have a spinning flywheel with some sort of grippy surface on it, even knurled slightly. Then have it spin a bit below 2" above a slide table. Then just slide the bar into it! Along the table. However, unless you like blood, you will want some sort of very strong stop behind the bar to prevent it from going AWOL.

[Gary Dillard]

Hmmmm.... I see all the previous posts here were before kickoff.

Dave Lavery offered that he has some ideas.

Chef Bill's company has been doing this for years.

Too bad the only application for this (achieving linear motion from a flywheel) is to punch holes

[greencactus3]

Originally Posted by Rickertsen2

Why is 100 rpm not enough? depending on the design of the flywheel, 100rpm could be more than enough. How much energy would be contained in a planet spinning 100rpm!!!!!

i never said its not enough revs. please reread my post. it says not enough info on the motor he wants to use.
that hotwheels principle is what i was attempting to explain too.

KenWittlief has a good point. other than the whole coolness of a rod flying 30feet to go through a sheet of metal, why do you need it to move so much?
and how about having a spike on the flywheel itslef and move that flywheel closer to the sheetmetal. and then itll more rip the sheet than just puncture (well not necessarily i know)

[mechanicalbrain]

First and foremost I'm doing a project to show the given force in centripetal motion, I wanted to develop this whole concept as a side project for future use, yes I do have reasons for wanting it to work this way. I think I have some general ideas for what I should look at doing and I have some ideas to play with.
So far my biggest worry is that to take the amount of force stored in a flywheel and transfer all at once would shred whatever I used...

[Bill Beatty]

Our company has been designing and building flywheel driven punching and shearing machines for more than 85 years. To produce a good punched hole you must have a die opposite the punch on the other side of the material. The force necessary to punch mild (C1020) steel is approximately 50,000 lbs per square inch of sheared area. Therefore to punch a 2 inch diameter hole through .125 thick steel will take 2 x 3.14 x .125 x 50,000 lbs. of force. This is the force in a blanking operation. Mild steel will fracture after approximately 33% break through. The energy to produce this hole will be the force X .125/3.

Hope this helps.

Mr. Bill

[KenWittlief]

Originally Posted by mechanicalbrain

First and foremost I'm doing a project to show the given force in centripetal motion...(

Im not sure the system you have been describing demonstrates the force in centripetal motion

we have been talking about converting the inertia in a flywheel into a linear motion

a good demonstration of centripetal motion is something we use to do on those little merry-go-round things they USE to put in playgrounds. You get about 8 people to hang off the edge, pushing their behinds out as far as possible. Then one person spins the ride around as fast as he can, then jumps onboard.

Now the fun part: everyone pulls themselves towards the center. You would not believe how fast the thing starts spinning, and how hard it is to hang on if you are the last person hanging onto the outer part of the railings.

They dont put these in playgrounds anymore (I wonder why?!)

[Jimbo5051]

Originally Posted by mechanicalbrain

What I want to do is take a 2' bar and move it 1' forward with a ton of force. Yeah I'm looking at using a motor with roughly 100 rpm. My goal it to be able to puncture 1/10" to 1/8" steel. Right now its part of science fair project for centripetal motion but I also am doing this to really learn about flywheels... oh and eventually im going to apply it to a Battlebot

Very good Idea I think that it would be feasible. But I do think you should gear it up to 350 rpm.