Thanks! I'll read the .pdf's when I get home.
One thing I see from the thread is I may have got the wrong inserts. I probably should have got 20.50's with the .008" nose instead of 20.51's with an .016" nose.
WAM <ajawam2@...> wrote:
?
There's a great article on boring bar chatter:
A lot of math tho...
Long thin boring bars are prone to that.
Some comments here:
Do you have a larger diameter boring bar? That may help...
Also - tunable boring bar article:
Basically add some mass to change the resonant frequency ...
Ryan_Hodges wrote:
>Hi group!
>
>I recently bought a 3/8 indexable boring bar that uses CCMT inserts. The bar has 5¡ã negative built in. I'm using CCGT high polish 21.51 inserts and have a huge amount of chatter. I'm doing a 3/4 inch diameter hole just over 3" deep in 6161 aluminum.
>
>I've tried the bar above center and on center. Above seems to chatter a bit less but I still can't get a nice cut.
>
>Wrong insert, bad setup? Do I need a different bar? Just too deep of a hole and I'm going to have to live with it?
>
>Any tips, tricks, hints, etc will be greatly appreciated!
>
>Ryan
>
>
>
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