Wanted! 1 3/8 Ball End Mill

Degull · May 28, 2021

Hi everyone. I'm looking for a 2 flute 1 3/8" BALL end mill. Length of cut is not important. If you have one rolling around your tool box that you don't need, please let me know!!

Fernando

Milland · May 29, 2021

You can buy the correctly curved carbide insert and cobble together your own body to mount it. I've done this for one-offs when I didn't feel like buying a large radius solid cutter.

http://www.millstar.com/pdf/Millstar_catalog/insert-Ball-Nose.pdf

The biggest these guys have listed is 1.25", you can contact them and see if they have any larger options, or do your own searching.

Degull · May 29, 2021

It seems as though anything over 1 1/4” is not very common in the Ball end mill world. Thanks for the suggestion!

Degull · Jul 19, 2021

Still looking!

michiganbuck · Jul 19, 2021

Here is a 1 1/2" end mill for $50.

Hanita - Square End Mills Mill Diameter (Inch): 1-1/2 Number of Flutes: 6 (S38) | eBay

A local cutter sharpening shop likely would grind it down to 1 3/8 and put a ball on it.
You might ask here if someone on PM has a dull 1 3/8 EM for sale.

Someone here on PM might make you one if you had a standard to alter.

eKertz has a Monoset, perhaps he might grind one from a standard(?)

*How accurate do you need.

Yes, A 6 flute can be made to a two flute.
With a 1" wide wheel one can dress a 1 3/8 rad into a wheel and run/grind the radius on a surface grinder...then back it off to very close even on a bench grinder.

eKretz · Jul 19, 2021

I might actually have a candidate kicking around, I'll check for you. After I get out of the ER.

Is it important that it's exactly 1⅜"?

Degull · Jul 19, 2021

eKretz said:
I might actually have a candidate kicking around, I'll check for you. After I get out of the ER.

Is it important that it's exactly 1⅜"?

I need it to be as close to 1.375 as possible. I am copying a Diacro tube bending die. The tube needs completely supported around the bend. I have a #2 Diacro bender and 1.375 does not exist for the #2 bender.

kenton · Jul 19, 2021

It's not exactly what you are looking for, but if you can map out your locations in CAD or do the math you could make a pretty good approximation of a .6875 radius with probably a dozen passes with a 1.25" ball endmill. You could even finish it with sand paper to knock any slight ridges down if you felt the need.

michiganbuck · Jul 19, 2021

Diacro tube bending die.

Are you going to scalp the radius to the OD of a bending die?

And the same to the pull part.

Making a set of Round Dies for a Di-Acro Bender - YouTube

tube bending
Diacro tube bending die. - Bing video

This seems a better lathe job...unless the pull is a flat part with a radius.

AARONT · Jul 19, 2021

Do you need carbide? If not, $84 https://www.mscdirect.com/product/details/01760784

Degull · Jul 19, 2021

michiganbuck said:
Diacro tube bending die.

Are you going to scalp the radius to the OD of a bending die?

And the same to the pull part.

Making a set of Round Dies for a Di-Acro Bender - YouTube

tube bending
Diacro tube bending die. - Bing video

This seems a better lathe job...unless the pull is a flat part with a radius.

I am bending thin wall 4130 tubing so I’m staying at safe min center line radius of 6”. I made a few on my Deckel mill and rotary table already.

Degull · Jul 19, 2021

AARONT said:
Do you need carbide? If not, $84 https://www.mscdirect.com/product/details/01760784

Thanks! That’s not a bad price. If no one here has one rolling around their tool box, I’ll buy new.

kenton · Jul 19, 2021

If you have a 1.375 square endmill you could mount the die in an indexer and off set the tool off to the side. You would probably need multiple passes moving towards center but you would need that with a ball end mill.

If you had the clearance you could probably do the same thing with a boring head set to 1.375.

Degull · Jul 19, 2021

The material I am bending is .035” wall 4130 chromoly. I am pushing the capacity of the Diarco #2 bender but so far I am please with the results. I have since made 1.25” diameter 5.75” CLR bender die. It worked great so I would like to try to go up a size to 1.375 diameter 5.75 CLR.

kenton · Jul 19, 2021

Nice looking dies. I was imagining full circles. Those would be harder to make with my ideas.

eKretz · Jul 19, 2021

kenton said:
Nice looking dies. I was imagining full circles. Those would be harder to make with my ideas.

Not really, using the smaller ball mill you could just spin the part with a rotary table and do the coordinate milling that way.

michiganbuck · Jul 19, 2021

One can dress a 1 3/8 radius (or any size)in a surface grind wheel and grind the parts, also easy on a TC grinder. yes, would have to roll the part to get the 90* enter and walk out... not going full around. Yes the surface grinder using a rotating device, or a stub for an axil bolted to an angle plate.

You would grind the in and out flats first to about .003 / .005 short of size, and then roll the part to blend in with the flats., taking the .005 for the blend.

A Keo cutter at 1 3/8 would cost a small fortune.
KEO Milling 81388 Large Diameter Convex Milling Cutter, "CVL" Style, 1-1/4" Arbor Hole, 14 Teeth, 3/8" Convex Radius, 3/4" Circle Diameter, 6" Cutting Diameter, HSS, TiCN Coating: Amazon.com: Industrial & Scientific

eKretz · Jul 22, 2021

Checked and the one I was thinking of that I have is a 1½" ball mill, and it ain't in great shape.

lucky7 · Jul 22, 2021

If the OP doesn’t mind a different route- suggest roughing out with 1 1/4” ball then single point to 1.375” with a boring head on a tangent to work piece setting. Will take longer but give better finish with less chatter. Probably less marking up tube on bending.

L7

kenton · Aug 14, 2021

I finally got around to single pointing a radius on my dividing head.

Wanted! 1 3/8 Ball End Mill

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