Chamfer leaving burr

**artracing** · 02-25-2018, 08:15 AM

Lots of time I chamfer a edge I get a burr and have to tweak the parameters.
I use a 90 degree pointed 3/8 bit. If the bit is slightly off the edge and goes a thousand in or so the tip
of the bit will leave a burr along edge.
I usually fix this by changing the tool diameter to little bigger and then a little deeper cut.
I have a job coming up with lot of chamfering.

What is good process to solve this issue and make it fool proof?

What procedure do you use?

Rob

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**jrmach** · 02-25-2018, 06:13 PM

ummm,,,not enough information,,by a mile
Material ? condition of material ?
machine speed capabilities ?
what kind of tool material ? Manufacturer ?
How big a chamfer ? Break edge or a real Chamfer ?
Using Coolant ?

**LeWhite** · 02-25-2018, 10:38 PM

A lot of time I have traced to 'time in the cut' or length of chip! Using a smaller diameter tool will help a lot! Play with coolant on and off.

**BurrMan** · 02-25-2018, 10:44 PM

As a non machinist, i would think that trying to chamfer right up to the tip of the tool, would just produce this type of issue. The idea aboit being longer and going past a bit, sounds good to me! But that is a limited perspective.

**jrmach** · 02-25-2018, 11:03 PM

as a Machinist,,I vary what part of the tool I use,till I wear out the whole tool,,,with that comes changing the variables that go with that

**artracing** · 02-26-2018, 06:36 AM

Originally Posted by jrmach

as a Machinist,,I vary what part of the tool I use,till I wear out the whole tool,,,with that comes changing the variables that go with that

Thanks for feedback. I guess I'll always go with making v cutter diameter a little bigger, so it moves the tool out from edge a little more.

**The Engine Guy** · 02-26-2018, 07:14 AM

Originally Posted by artracing

Thanks for feedback. I guess I'll always go with making v cutter diameter a little bigger, so it moves the tool out from edge a little more.

In your chamfer feature the distance set from the edge that is to be chamfered should be the centre point of the chamfer tool edge, that way the point of the tool will always be clear of the job, a little Math required

Chamfer tools are not generally expensive so I have always had a number in stock, for softer materials like Aluminium I have always used Carbide to get a cleaner cut, harder materials will cut more easily without a burr but the rule is "keep `em sharp"

See Image.

Regards
Rob