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Drilling

11/28/23       
Dropout Member

I know some of you are miles ahead of me on this.

I have always used a drill block but am now setting up an old Komo without one.

If I used a feed rate of 50 IPM at 4K RPM on a drill block, can I use 100 IPM at 8K? Or 150 IPM at 12K RPM?

Where does the drill geometry start to limit this?

Thanks for all thoughts.

11/30/23       #4: Drilling ...
Tom Gardiner

I think I am at 100 ipm at 6500. I tried 150 ipm and started to get the occasional chipped hole. Anything above that feed rate would be diminishing returns because accel/deccel on such a short distance would mean you would never get up to that feedrate.
You can get significant cycle time improvements from reducing the safe z to a minimum.

11/30/23       #5: Drilling ...
Dropout Member

Thanks.

11/30/23       #6: Drilling ...
SteveL

sorry to but in, but are you saying 100 ipm plunge rate ? I currently am at 60 ipm plunge rate and would be great to increase that.

11/30/23       #7: Drilling ...
m c

this might help
https://www.daycounter.com/Calculators/GCode/Feed-Rate-Calculator.phtml

11/30/23       #8: Drilling ...
Tom Gardiner

It is a common question on all cnc forums "what feed and speed should I run". Nothing wrong with that but take the answers as starting points. When I start with a new cutter/material I set my feedrate uncomfortably high. I make a small representative toolpath to tune my settings in an offcut. If you are cutting mostly straight then just run lines or skinny rectangles or ovals or stars for more complex needs. Then I use my feedrate and spindle override to start slow and move up through the range until cut quality degrades.
Of course this doesn't always work - sometimes vacuum hold down means keeping the depth of cut shallow. Another problem I have to get over is being too shy about loading up the cutters to keep the heat down. It pays to feel the temperature of the cutters after running to see if you need to increase the chipload.

11/30/23       #9: Drilling ...
Dropout Member

As I said, I'm new to the drilling with a spindle but tons of experience cutting, mostly plywood.

We have determined our cut speed by increase the feed til the tool breaks and then back off a little.

12/1/23       #10: Drilling ...
Bud White

Just took a look and our machine is set at around 75 ipm at 3000 rpm

12/1/23       #11: Drilling ...
BH Davis  Member

Website: http://www.bhdavis.net
 I think faster than 3000 rpm on a drill bit is getting beyond it's optimal range. I suppose if you raised the Z-axis speed substantially you could catch up with the rpm. But as said above in the short distances of drilling operations you would probably never get up to the feed rate anyway.

Tom's working speed of 6500 rpm at 150 ipm is an interesting counter to this theory. Certainly worth a try.

BH Davis
12/2/23       #12: Drilling ...
Tom Gardiner

I've been working with the same 5mm carbide bit for a couple of years. I'm not doing daily drilling or even weekly with the bit but it has held up over time. By comparison what is the rpm of a Blum machine? Sold mine so I can't check.
Sorry Dropout my last post sounded pedantic in re reading.

12/18/23       #13: Drilling ...
Z  Member

Website: Arrowdesigncustoms.com

Setting up an older komo!? I’m jealous, I miss my 2000’s heavy steel.

When I get to the office tomorrow I will check and see what we ran our Mach 1 routers at.


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