45 chamfer tool leaving a burr

[Thad]

I'm a die guy so I make tooling, not finished product parts that we sell. I don't often have to deal with using a chamfering tool where it matters. For the times that I want/need to use one, we have a 1 flute Hertel 45 degree insert cutter. Whenever I use it it leaves a burr. Is this a crappy cutter or is this to be expected? Leaving a burr with a chamfering tool seems counterproductive.

 

I have a short production run of parts (these are finished product parts) coming up that require chamfers, surface finish callouts, etc. I'd like to run around it with the chamfer tool and be done. As it stands, I'd have to hit it with a file after machining to take off the sharp edges, potentially scratching/marking up the nice finish required.

 

I bought some Harvey solid carbide 45 cutters that will hopefully give me a nice chamfered edge with no burr.

 

EDIT: These are profile chamfers with a contour toolpath, not a drilling cycle to chamfer a hole.

 

Comments?

[Guest]

Sounds like a crappy cutter..

 

Typically I prefer multi-flute chamfering tools

[Thad]

Thanks John.

[Rstewart]

Harvey tool coated Helical Flute Chamfer Cutter

 

[mkd]

Use a multiflute and Trig the TLO and CC to keep it cutting on a fresh part of the tool.

[BCW]

I prefer these since they have a sharp point on them so I can use it for chamfering, engraving, and spotting 90deg holes.

 

http://www.harveytool.com/prod/Drill---End-Mills/Specialty-Profiles/Browse-Our-Products_193/Drill-End-Mills---Mill-Style-4-Flute_206.aspx

[Thad]

This is what I bought (looks like Rstewart's)...

 

http://www.mscdirect.com/product/details/79972410?rd=k&searchAhead=true&searchAheadTerm=799724&typahddsp=79972410&hdrsrh=true

[jlw™]

Ditto those Harvey tools. Love them.

[Matthew Hajicek - Singularity]

Harvey tool coated Helical Flute Chamfer Cutter

 

 

I just got some of those a few weeks ago.  Working great in Ti so far.

[Guest]

I would not be surprised if it's the Hertel brand itself

[jeff]

I just got some of those a few weeks ago.  Working great in Ti so far.

That's more or less what we use, not Harvey brand though.

I use 1/2" and 1/4" diameter ones. Love em.

[Thad]

I would not be surprised if it's the Hertel brand itself

 

Yeah, that wasn't my choice, especially not the one flute. I've only got 8000 RPMs. One day my boss came in and said, "Here, I got you a chamfering tool."

 

I'm wondering if it's chamfering insert tools in general...as opposed to solid carbide. I don't remember the brands, but other shops where I worked, they weren't much better and they were all insert tools. Maybe just a coincidence, I don't know. It didn't matter though since an apprentice was going to go crazy on it with a 90 grinder anyway.

[cherokeechief79]

I use Harvey mostly but once in a while you get a material or a heat treat that just leaves a burr no matter what.there is also nothing more unsightly then having to file a contoured edge on a nice part.sometimes I will run the finish tool again or sometimes ill rough then chamfer and then finish the od or id contour.

[Thad]

Speed and feed recommendations? I'll be cutting something similar to 4140 pre-hardened (Rc 28-32).

 

I appreciate all the feedback, guys!

[MrFish]

Garr make some good ones and they are cheap too.

[crazy^millman]

350-600 sfm and make sure you keep the chip load per tooth above .001.

[Rstewart]

I'm running that harvey tool above at 300 SFM with a .0018CLPT in Hardened 4130 and they last forever.

[jeff]

Speed and feed recommendations? I'll be cutting something similar to 4140 pre-hardened (Rc 28-32).

 

I appreciate all the feedback, guys!

If it's a coated solid carbide 4 flute, I run mine at 80ipm, 8k rpm. 

We cut a LOT of 4150pht 28-32. 

[Matthew Hajicek - Singularity]

Inserts generally aren't as sharp as a solid carbide, which means less shearing and more pushing.  That makes for burrs in softer materials.

[Thad]

Thanks for all the input. You guys are the best! 

[Teh Bear without Brains kinda idiot]

Disregard my post