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Old 10-04-2017, 12:16 AM
FloMo14Builder's Avatar
FloMo14Builder FloMo14Builder is offline
Join Date: Sep 2017
Location: Flower Mound, TX
Posts: 68
Default Debur chatter

This is the result I get when i give my Avery speed deburring tool a 360 around a drilled hole.

This is a #40 drilled hole deburred and then dimpled on DRDT-2. Dimple was done to improve visibility of the jagged edge of the deburred hole.

I have tried using light pressure and heavy pressure fast and slow with similar chatter. Do I just need to buy a new 3-flute cutter? This tool was purchased new (in 2007) and has only been used on about 100 or so holes. If this is normal and I am just looking too close, I will be thrilled with that answer.

I am seeking your collective advice as I am now frustrated before I have even started (this is a piece of scrap from a 2007 Oshkosh sportair workshop that I was using to experiment on this afternoon). I have also been having some issues with my drilled holes not being round, but hopefully I solved that with a new set of drill bits.
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Last edited by FloMo14Builder : 10-04-2017 at 01:57 AM.
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Old 10-04-2017, 02:52 AM
jrs14855 jrs14855 is offline
Join Date: Apr 2008
Location: Lake Havasu City AZ
Posts: 2,644
Default deburring

1/4" shank 3/8 diameter 100 degree countersink, six flutes. MSC supply or industrial hardware store. If you can't find a handle for it make one. I can't find a source for the handle I have had for years. I used to be a fan of single flute countersinks for deburring but got over that a long time ago.
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Old 10-04-2017, 04:07 AM
leok leok is offline
Join Date: Apr 2013
Location: Clarkston, MI
Posts: 421

Chatter results from a cutter that repeatedly digs in, breaks loose, digs in, breaks loose. etc.. It is a harmonic with the machine (you) spinning the tool or work piece.
There are lots of ways to address this, but often the easiest is to change the cutter speed. Try spinning the tool faster or slower while adjusting pressure.

The tool can also have the tip of the blade ground to an angle that adds to chatter. In that case I have sometimes had success 'breaking in' the tool by deburring a few holes in steel. Tools will change over their life, depending on the wear, chattering only when fresh or more typically when forcing a dull tool.

Otherwise replace with a different brand/batch tool to find one that works for you.
Building started Oct 5th 2014, Flying since 1/16/2020
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Old 10-04-2017, 06:35 AM
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snopercod snopercod is offline
Join Date: Aug 2016
Location: Asheville, NC
Posts: 2,122

These work great and never chatter:
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Old 10-04-2017, 07:22 AM
rv7charlie rv7charlie is offline
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Location: Pocahontas MS
Posts: 3,888

Listen to Snopercod....
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Old 10-04-2017, 07:52 AM
BillL BillL is offline
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Location: Central IL
Posts: 6,322

Originally Posted by rv7charlie View Post
Listen to Snopercod....
+1 +1 Just don't use them on fiberglass - even once.

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Old 10-04-2017, 08:09 AM
cczarnik cczarnik is offline
Join Date: Sep 2016
Location: Middle TN
Posts: 124

+2. I got the little one from Cleaveland. Wasn't a fan using it in the drill press or by hand. But a cheapie electric screwdriver from lowes is the perfect speeed, 2 turns and done. Press was too fast to cut well.
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Old 10-04-2017, 08:33 AM
Mudfly Mudfly is offline
Join Date: Dec 2011
Location: Alpharetta, Ga
Posts: 218

I like those for deburring as well. However, from my experience, they require much less pressure than the other deburr bits. Too much pressure/turns and the hole will be countersunk instead of deburred.
Shawn Edwards
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Old 10-04-2017, 09:13 AM
sblack sblack is offline
Join Date: Dec 2009
Location: Montreal
Posts: 1,520

slow the speed way down
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Old 10-04-2017, 11:10 AM
rv7charlie rv7charlie is offline
Join Date: May 2006
Location: Pocahontas MS
Posts: 3,888

Offset handle to turn it is all you need. Power will almost always cut too much with any of the bits.
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