THE CAUSE OF CHATTERING WHEN MACHINING - MODEL ENGINEERING FOR BEGINNERS - PART #50

The Cause of Chattering When Machining - Model Engineering For Beginners - Part #50.
Machining Cast Iron Flywheels and Wheels in general can be difficult owing to the curious phenomenon known as "Chattering". In this episode I show how and why this occurs.
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[IM-qqjf]

Thank you for this great education of a fustrating isshew with turning.
I like your big blue lathe, you cant have enough lathes !
Ian T.

[godfreypoon]

I solved the problem of chattering when machining by banning my wife from the workshop.

[associatedblacksheepandmisfits]

It being a spoked flywheel held by the centre doesn't help either, not an entirely rigid piece. So many variables for the novice to master here. Many words have been written 😊

[robertweldon]

I was just wondering; Does the fact that the flywheel is a CASTING come into play here? My minimal knowledge of metallurgy says that cast metal is more crystalline and so machining is more difficult, and if it is iron verses steel it's worse if iron.
Well you know more than me here, that's for sure. I will soon learn more tomorrow. ;-)

[russellbailey]

I wonder if sandwiching plastic discs with dense foam or rubber on each side of the flywheel would eliminate the chatter. I sharpen cup blades 3 times a week for a local poultry plant. I cut a 1/8 inch by 3 inch piece of rubber wrapped it around a cup then ran duct tape around it. Eliminated ringing noise and chatter.

[mrb.]

Grinding is also another option - especially if you're running out of 'meat' on the item being machined !

Something like a Dremel mounted in the tool post with precautions to keep grinding dust off the bed and sideways would do - not for roughing cuts though - more of a surface finishing tool.

[talenttrading]

Do you need cutting oil when you are facing a piece on the lathe? Is it only used when drilling?

[PaulSteMarie]

Yeah, chatter has an obnoxious way of showing up when you're almost finished. I think it's usually do to taking a very shallow cut at the end. The usual recipe for removing chatter is more rigidity, slower spindle, and heavier cuts. I've taken to spacing my cuts so i can take about 0.050" on the final pass, but that's for my machine with my tooling.