Feeds and speeds. Some tips for a newbie please!

[Dave_stoke]

Little machine shop can now suck my plums!
Just had a new 2mm flat 4fl endmill delivered.
Out of the box and broken in 3 minutes!

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[Chaz]

Little machine shop can now suck my plums!
Just had a new 2mm flat 4fl endmill delivered.
Out of the box and broken in 3 minutes!

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What speeds and feed? What material?

4 flute?

[Dave_stoke]

What speeds and feed? What material?

4 flute?

Exactly this

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[Chaz]

Exactly this

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I wouldnt be using 4 flute for brass / alu. 3 at most, 2 is better. Did it snap on first engagement or did it cut for a bit?

[Dave_stoke]

I wouldnt be using 4 flute for brass / alu. 3 at most, 2 is better. Did it snap on first engagement or did it cut for a bit?

It got this far but very aggressive. I suppose I should have dragged the feed slider down. But a calculator should be accurate no?

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[Chaz]

It got this far but very aggressive. I suppose I should have dragged the feed slider down. But a calculator should be accurate no?

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From the pic, it looks like you plunged directly into the stock or did it do a helix down? If you plunged then that would be an issue, not the best way to engage a cutter into material. When I cut at new speeds I turn the feed down to 10% and then ramp up once I have done the helix down and then started to make the cuts I expect. Sound / vibration / noise is key.

[Dave_stoke]

From the pic, it looks like you plunged directly into the stock or did it do a helix down? If you plunged then that would be an issue, not the best way to engage a cutter into material. When I cut at new speeds I turn the feed down to 10% and then ramp up once I have done the helix down and then started to make the cuts I expect. Sound / vibration / noise is key.

It's actually a helix entry.

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[Chaz]

It's actually a helix entry.

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Material looks a bit gummy. Did it clog up the bit? Id say 4 flute is to blame here (IMHO / 2p).

[Dave_stoke]

Material looks a bit gummy. Did it clog up the bit? Id say 4 flute is to blame here (IMHO / 2p).

Honestly I started with 4fl when I got the machine, this was done with 4fl 2mm a while ago. But without using the calc

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[Chaz]

To me (and the pics arent very clear) it looks like the tool lacked lubrication and/or ability to clear material fast enough. A 2 flute is more forgiving.