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Can't Stop the Squealing!

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Can't Stop the Squealing!
Thumb Offline
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#1
03-06-2017, 03:00 PM (This post was last modified: 03-06-2017, 03:01 PM by Thumb.)
I'm on my second lower and even through the 1st one I can not get the dang thing from squealing no matter the feed speed, the bit speed, or how little I take off. it just squeals like crazy. Is it the 4-flute bit or something else. I'm using kerosene as a lubricant/coolant if that matters. I'm pretty sure the lower is 6061 but it could be 7075. It does not do it if I just plunge. BTW, I'm pretty new at milling but have done it for years at work, someone else just set it up and I ran it.
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dallen Offline
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#2
03-06-2017, 03:46 PM
can't help with the squealing, but the parts your working on should be 7075.
dallen, proud to be a member of MetalworkingFun Forum since Apr 2012.

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EdK Offline
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#3
03-06-2017, 04:42 PM
Is it a billet lower of a forged lower?

Ed
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#4
03-06-2017, 04:49 PM
It's a billet. I'll see if I can find out for sure if it's 6061 or 7075.
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Dr Stan Offline
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#5
03-06-2017, 08:22 PM
Are you plunge cutting?  If so make sure you use a center cutting end mill.

Or is the squealing coming from the mill?  What type of head is on the machine?
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ScrapMetal Offline
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#6
03-06-2017, 08:47 PM
I've not found a way to get rid of squealing (when it's the endmill) on certain cuts.  My solution so far...

[Image: 41CeP-fm6GL.jpg]

Just sayin' Big Grin

-Ron
11" South Bend lathe - Wells-Index 860C mill - 16" Queen City Shaper
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#7
03-06-2017, 10:39 PM (This post was last modified: 03-06-2017, 10:41 PM by Thumb.)
(03-06-2017, 08:22 PM)Dr Stan Wrote: Are you plunge cutting?  If so make sure you use a center cutting end mill.

Or is the squealing coming from the mill?  What type of head is on the machine?

It is a center cutting end mill and if I do plunge, it doesn't squeal. I don't know what head it is unless you're talking about it being an R8. It is coming from the bit.


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Dr Stan Offline
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#8
03-07-2017, 12:26 PM
Regarding the head I was thinking along the lines of step pulleys V vari-drive.  Worn belts in either case can squeal like a stuck pig.
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#9
03-07-2017, 03:07 PM
OK, it's step pulleys but the belts have less than 5 hours on them. The squeal is definitely from the bit.
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Mayhem Offline
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#10
03-08-2017, 07:20 AM
OK - this is going to sound like a smart arse response but it isn't - have you checked that the spindle isn't running in reverse? Yes - I accidently did this once when I first got my mill, as the switch is the dead opposite to my lathe Slaphead
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