Feeds and speeds. Some tips for a newbie please!

[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.

[Richard]

Tried a new 12mm carbide bit today.

Lovely finish but degraded after approx 5m of cutting distance.

I tried upping speed from 8k and feed from 800mm/min

Here's some pics of the bit afterwards, some heavy wear.

Maybe I should have lub'ed...

Am I still going too slow in rpm/feed or should I flood with coolant?

(the reason I did this dry was that I haven't got my cooland set up yet...)

[Dave_stoke]

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.

I didn't have my coolant running. I doubt it would have made any difference tbh.
I can't slow it down it doesn't get near the stock. It's started acting up again. Losing steps for fun. Certainly doesn't like helix.
I think it's time to give up tbh. The machine is what it is cheap but not cheerful. But £800 isn't cheap.

Thanks anyway buddy

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[Chaz]

I didn't have my coolant running. I doubt it would have made any difference tbh.
I can't slow it down it doesn't get near the stock. It's started acting up again. Losing steps for fun. Certainly doesn't like helix.
I think it's time to give up tbh. The machine is what it is cheap but not cheerful. But £800 isn't cheap.

Thanks anyway buddy

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The issue is, in this world, £800 is not a lot.