Countersink cutter

This topic has 10 replies, 6 voices, and was last updated 6 September 2013 at 11:33 by Paul Lousick.

Viewing 11 posts - 1 through 11 (of 11 total)

Author

Posts
4 September 2013 at 14:11 #22805
Paul Lousick
Participant
@paullousick59116
Advert

4 September 2013 at 14:11 #128563
Paul Lousick
Participant
@paullousick59116
I have to machine large countersink holes in 8, 12 and 20mm steel plate, up to 38mm x 90 degrees with a Sieg X3 mill.

My options are to buy or make a countersink cutter. Which way to go ?

Have seen 40mm HSS single flute cutters on e-bay. Are 1 flute cutters any good >

Also 2,3,4, or 6 flute cutters. Which are better ? (Would like a replaceable carbide insert cutter but expensive). Does anyone have any expeience or suggestions ?

Paul.

Edited By Paul Lousick on 04/09/2013 14:13:07

Edited By Paul Lousick on 04/09/2013 14:14:01
4 September 2013 at 17:01 #128582
Mike
Participant
@mike89748
I can only speak from personal experience, which suggests that the fewer the flutes, the less likely the countersink is to chatter. My choice would be a single-flute cutter in HSS. What do more experienced engineers think?
4 September 2013 at 17:06 #128583
Michael Gilligan
Participant
@michaelgilligan61133
Generally speaking … odd numbers of flutes [cutting edges] seem less prone to chatter than even numbers.

For your job, I tend to agree with Mike …

MichaelG.
4 September 2013 at 17:57 #128590
Sub Mandrel
Participant
@submandrel
I'd vote for a single flute, I'd even consider making one from silver steel, although it will have to be treated gently.

Don't bother with the ones that have a hole through a cone, they are really only deburring tools IME.

The hole size is important too – a 36mm countersink on a 30mm hole isn't a tough task, but one on a 12mm hole is very different!

Neil
4 September 2013 at 17:57 #128591
mark costello 1
Participant
@markcostello1
A small boring head or fly cutter with a shaped tool would do the job the cheapest if You have the tools, just not the fastest.
5 September 2013 at 09:36 #128638
Paul Lousick
Participant
@paullousick59116
Thanks for the feedback.

Saw a 40mm HSS single flute cutter on flee-bay for $45 will give it a try. Otherwise may make one with carbide inserts.

Regards, Paul
5 September 2013 at 13:01 #128647
Trevor Wright
Participant
@trevorwright62541
A countersink that big is a recipe for mega-chatter on a small mill like the Seig.

You need to run the tool as slow as 20rpm to get a clean (not 50p piece) profile with a single tooth cutter.

When doing large countersinks in the past – on big machines I might add – I would turn the spindle by hand for the last cuts as the spindles could not go slow enough.

Have fun…..by hand I mean with a big spanner or tommy bar

Trevor

Edited By Trevor Wright on 05/09/2013 13:02:10
5 September 2013 at 13:03 #128648
Trevor Wright
Participant
@trevorwright62541
I have also been known to profile the pocket on the CNC because it was less hassle…….

Trevor
5 September 2013 at 14:25 #128655
Sub Mandrel
Participant
@submandrel
My home made cutter would be a conically ended d-bit, so very unlikley to rpocuce an out of round hole, but yes run slowly.

Neil
6 September 2013 at 11:33 #128748
Paul Lousick
Participant
@paullousick59116
Thanks for the advice. I can only have a go at producing a decent countersink hole. If not successful will have to find a larger machine.

Regards, Paul.
Author

Posts