What a difference a mm makes.

[Christianstark]

Just thought I would share. Today I began machining down the drive wheel adaptor for the Vandelay belt grinder build I have been working on. I think as a beginner machinist I have been approaching my cuts kind of gingerly, and playing with spindle speed the try and get chips breaking. It has not worked out well.

Today I have roughly 40MM to machine off the diameter of a part, so I started off with a 1mm cut with a carbide CTMG insert in steel. Not sure of what flavor of steel it is as I won an auction from a closing shop, and got literally TONS of Aluminum and steel bar, chunks, scrap, etc.

1mm DOC at 335 RPM SO ANNOYING.


Said what the hell, lets go for 2mm...

What a difference DOC makes!

 

[MrWhoopee]

Standard advice: Keep turning it up until it stalls or something breaks, then back off and run it.

Nice looking chips, now you know what to look for.

 

[Just for fun]

Looking good and good info.

 

[Christianstark]

Need to post a correction. its actually 1mm vs 2mm on diameter. so actual DOC is halved.

 

[mmcmdl]

Standard advice: Keep turning it up until it stalls or something breaks, then back off and run it.

Nice looking chips, now you know what to look for.

Exactly correct . No steel wool is allowed unless polishing .