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Strange end mills

Hukshawn

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#1
Never mind the chowdered ends, one flute is wider than the other.
I've never seen anything like that before.
Rummaging through the box of goodies that came with my mill.
I assume they are for aluminum?
IMG_20171111_222206.jpg
 

Hukshawn

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#3
Yeah the picture was hard to take.
They are not hand ground that way. The chisel point is actually off center.
 

4gsr

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#4
It's ground like that, so it acts as an wiper from the one longer end cut. Rather it works that way or no, I don't know. I've seen a few of them in my past, not a popular grind. Easy to fix if you know someone who is set up to regrind endmills. Not something you want to fix by hand.

Ken
 

Hukshawn

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#5
They went into the garbage with a pile of other broken dull crap.
I have to be conservative with my small garage shop.
 

timmeh

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#6
Nothing wrong with them, Slot Drills are supposed to have uneven cutting edges.
 

British Steel

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#7
What Timmeh said, it's so they can plunge into the work without a pilot hole when slotting, fish them back out of the trash!
The centre doesn't cut brilliantly because SFM drops to zero on the axis, a bit like drill bits, but the ability to plunge cut without a pilot hole speeds jobs up and makes 'em worth having.

Dave H (the other one)
 

Hukshawn

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#8
They're all dull and caked in aluminum. I have no ability to sharpen them. There were a bunch of mills I tossed cause they're dull. A big rougher too. All burnt out
 

Hukshawn

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#9
I'll fish them out. If someone wants them, just pay for shipping. I'll post a picture later
 

akajun

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#11
I found a few of those in some dull endmills that I was given. Discovered them when I was sharpening endmills. They sharped easy enough, but you can not "correct the grind" as someone suggested as the helix is off center. The sharpened ones seem to cut ok.
 

EmilioG

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#12
You can always grind them into V cutters and single point countersinks. You can always use them for practice.
 
Container Above bottom breadcrumb