What causes his "Pock Marked" finish ??

This started when I was trying to remove the cutting lines,
I rounded the bit, the cutting line mostly went away, now I have pock marks.
 
You were having some issues with gears wearing out on that machine- where do you stand on that situation? Did you ever resolve it?
Mark
 
The pock marks are likely from either (or both) tearing due to low RPMs or, weld build-up on the tip of the insert. Also, do you know what specific kind of aluminum that is? 60xx and 70xx series machines fine. 20xx, 30xx and 40xx series machine a little bit worse than warm bubble gum.


Ray

EDIT: I can tell by looking at it, it is not 70xx series. It could be 40 or 60 just based on color/sheen.
 
markba633csi said:
You were having some issues with gears wearing out on that machine- where do you stand on that situation? Did you ever resolve it?
Mark
Click to expand...

Hey Mark,
I posted on the Gear Thread that I discovered a gear shaft gouged,
I groomed it and reinstalled, then I oiled all the apron fittings until
oil was dripping on the chip pan.
Oil, oil, oil !!
It appears to be working well.
 
Ray C said:
The pock marks are likely from either (or both) tearing due to low RPMs or, weld build-up on the tip of the insert. Also, do you know what specific kind of aluminum that is? 60xx and 70xx series machines fine. 20xx, 30xx and 40xx series machine a little bit worse than warm bubble gum.


Ray

EDIT: I can tell by looking at it, it is not 70xx series. It could be 40 or 60 just based on color/sheen.
Click to expand...

Hey Ray,
Its 6061.
 
Here's the million dollar question,
How much should I be taking off on a finish cut ??
 
GreggC said:
Here's the million dollar question,
How much should I be taking off on a finish cut ??
Click to expand...

With carbide, minimum of 10 thou DoC. With 6061, you can go pretty deep.

Ray
 
GreggC said:
My Lathe can handle taking .010 ??
Shop Fox M1049
Click to expand...

I should think so... 3/4 HP is more than enough. I used to cut 20-30 thou with a clapped-out Atlas 618 with a 3/4 HP motor.
 
Thanks guys,
Ill try it tomorrow and report back.
 
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