Drilling aluminium with chinese spindle

[morfeus80]

I am starting to use my homemade milling machine with a 2.2 kw chinese spindle. I need some help about the parameters to use to drill holes with standard HSS-co twist drills. I have tried to drill with 4mm diameters at 10000 RPM and 20 mm/min feed. It works but it looks quite slow, in fact chips are almost dust.
Hi increased speed to 40 mm/min, but I broke the drill. To be fair, I have the doubt that the drill was already damaged, but I can't be sure and I don't want to break more before listening to your opinion.
So what speed and feed do you suggest to use?

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[dazp1976]

On my small mill (sieg X2) I generally drill at 1,000rpm and 20-30mm/min with a 4mm bit. Yes it's slow, in my view the spindle head is too light for a good crack at it. I also run my coolant.
I reckon for a start at 10,000 rpm you're heating the bit quite a lot which won't help with breakages.
I had little luck with HSS and I now use cobalt bits for everything.

Haven't tried my new mill yet. It has a quill so I'll position by gcode with M1 between each move and drill the holes with the quill by hand.

[peteeng]

Hi All ---- https://www.cnccookbook.com/drill-fe...ds-calculator/

[morfeus80]

I had already tried to use that calculator, but the result feed is about 500 mm/min that is about 25 times more what I am using, I think it is too extreme. Furthermore it gives 4500 RPM but with chinese spindle it is better to work at least at 8000 rpm.

[peteeng]

well I think you will have to peck. 10,000rpm is generally too fast for a drill so you have to compensate somehow....Peter

[dazp1976]

I am starting to use my homemade milling machine with a 2.2 kw chinese spindle. I need some help about the parameters to use to drill holes with standard HSS-co twist drills. I have tried to drill with 4mm diameters at 10000 RPM and 20 mm/min feed. It works but it looks quite slow, in fact chips are almost dust.
Hi increased speed to 40 mm/min, but I broke the drill. To be fair, I have the doubt that the drill was already damaged, but I can't be sure and I don't want to break more before listening to your opinion.
So what speed and feed do you suggest to use?

Best option to me in this case would be to use a center/spot drill to make pilot holes (slightly smaller say 3mm) at around 4mm deep. They can go in a bit faster.
Then use drill press to drill the hole by hand afterwards.

I do this fairly often these days.
A cutter bit like this:
https://www.ebay.co.uk/itm/5pcs-60-C...l/262192375757

[routalot]

I wouldn't describe a machine with a router spindle as a mill and thats the source of your problem.Have you considered helical interpolation as an alternative?

[ger21]

I'd get high quality short length drill bits, and peck drill as fast as your machine can handle, at 8000-10000 rpm. Always start with a 3mm bit, and go back and finish with the 4mm.