How to make a phenominal chatter generator.

[savarin]

1. Find some aluminium plate
2. Cut an eight inch circle from it
3. Drill a 12 mm hole in the centre
4. Fit a 12mm bolt and tighten
5. Clamp the bolt in the lathe chuck
6. Start taking a skim from the face of the circle traversing from the centre to the outside edge.

The noise is unbelievable, I kept cutting just to see what would happen. It ends up looking like you've made a scroll for a self centering chuck.
Unfortunately I forgot to take a picture.

 

[brino]

The noise is unbelievable, I kept cutting just to see what would happen. It ends up looking like you've made a scroll for a self centering chuck.
Unfortunately I forgot to take a picture.

Something like that requires a video, not just a photo.
We all need to experience the musical song and the change in pitch as the tool sweeps the face of the disc.

-brino

 

[graham-xrf]

Just suppose the lathe, and all that concerns it was rendered uttlerly rigid, and invincible by Hephaestus.
If you touch or scrape anything on that resonant disc, you will set up the father and mother of vibrations!

Take the disc, de-burr the circumference, clamp the bolt into a vise, and borrow a violin bow, (or knock up some fishing line thing with resin on it).
Sprinkle very fine powder on it (corn starch or something).
Bow it! Make all kinds of shriek. Check out the pattern of powder. It will settle into the non-vibrating nodes.
Or - check out the YT videos, where the high school science kiddies do it for you

Of course, if you still want to face the disc, or trepan a accurate smaller disc out of it, glue it it up against a plywood/MDF backing disc that will damp out the ability to vibrate.

[Edit: I just know you were readily aware of the risks this would happen! ]

 

[T Bredehoft]

Gotta keep the Townsville folk on thier toes, eh? That ought to do it.

 

[savarin]

[Edit: I just know you were readily aware of the risks this would happen! ]

Yes, I was. I tapped it when it was in the chuck and it rang like a bell.
I've made one of these for a muso friend some years ago

so am pretty well versed in resonance

 

[Braeden P]

Ive done that that very loud and really annoying! cant imagine what it is like for you!

 

[hman]

1. Find some aluminium plate
2. Cut an eight inch circle from it
3. Drill a 12 mm hole in the centre
4. Fit a 12mm bolt and tighten
5. Clamp the bolt in the lathe chuck
6. Start taking a skim from the face of the circle traversing from the centre to the outside edge.

The noise is unbelievable, I kept cutting just to see what would happen. It ends up looking like you've made a scroll for a self centering chuck.
Unfortunately I forgot to take a picture.

Hmmmm ... if you use a very sharp pointy tool, you can probably put the finished plate on a record player and listen to the song again and again

 

[silence dogood]

Savarin. When you were growing up, you must have been the kid that liked to run your fingernails across the blackboard.

 

[682bear]

Been there- done that... a 54 inch diameter inconel bell shaped airplane part will SHRIEK when being machined... unless it is well supported in a cage fixture.

Sometimes it sings pretty loud while in the fixture...

-Bear

 

[mmcmdl]

You gotta love Inconel . Tougher than a $2 steak .