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mayday

5.5mm Guhring endmill

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trying to push the limits of this endmill.  roughing 4  .242 wide keys 4.4" long on a 4 axis. Doosan DNM 4500 control/Doosan/Fanuc+ Control

its on a 6" ext. sandvic hyd holder 6.8" oal lenght. depth of cut is .16

I  snow plow at 350sfm at .0035 per tooth/ 4 flute full depth , ping and ping again. gone

so tomorrow I'll try dynamic peel at same sfm 30% stepover

I'm gonna blow the the time study quote on this but I cant break tools all day. It's a turn key twin rotary 4 axis machine. high volume

Guhring rep comes in next Monday

welcome Apps Engineer to me

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Start with smaller depths. Is the tool is sticking out 6.8". Try a .02 step first.

 

Get a good part, then push the cutter.

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Look to the High Feed Style endmills to rough with then come back with the finish endmill to clean it up. Just about everyone makes the Endmills in the High Feed ends now.

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11 hours ago, mayday said:

I  snow plow at 350sfm at .0035 per tooth/ 4 flute full depth , ping and ping again. gone

Material? Cutter size?

I am assuming it is smaller than .2 and I normally reduce chip load 30% slotting so that's a hefty chip load for that size cutter...

If time is important and you can afford it I kinda like Ron's idea. Extra endmill but you could keep the size of your finisher larger and will probably be quickest.

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20 minutes ago, nickbe10 said:

Material? Cutter size?

I am assuming it is smaller than .2 and I normally reduce chip load 30% slotting so that's a hefty chip load for that size cutter...

If time is important and you can afford it I kinda like Ron's idea. Extra endmill but you could keep the size of your finisher larger and will probably be quickest.

Yes for anyone wodnering what I am reffering to. Here is a link to a 5mm one. They make them down to 1mm.

Iscar High Feed Solid Carbide Endmill

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So the idea with these hi-feed mills is that they direct most of the radial force directly up into the spindle which reduced radial cutting forces substantially. I've use them on insert cutters for hogging 4140. Sounds like a great idea when your tool is sticking out that far.

Is there anything like this for aluminum, or does the idea not transfer across those material types? Ive always assumed you want the most positive attack angle on aluminum which is why you have things like shear-hogs and ripper mills. The angle on hi-feed is the exact opposite of that lol.

 

Is it also true that those hi-feeds are "free cutting"? Ive never figured out what free cutting means. Someone explained it to me awhile ago but I have since forgotten.

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I'd be looking at it like Leon said - half the DOC and crank it up.

I don't think the slot is wide enough to peel mill with a 5.5 tool - you may blow the ballscrew (i did one a few years ago).

Hydraulic holders on long (relative) extensions - IME can induce vibration...

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Your feedrate of .0035 per tooth seems quite high for that diameter cutter. For fulll slotting i would be at about .001" per tooth.

This is for the RF 100 line of Guhring endmills. 

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