Chipload and DOC for small endmills

[M250cnc]

If the cutter is a centre cutting type I would chain drill it. As a cutter that small is stronger radially than axially.

You also are not going round re cutting chips.

I would step all the way round 1mm then when you are done step 0.5mm then step 1mm again to cut out the webs.

You have then removed 90% of the waste and can then finish the slot.

For chip load 0.01 per tooth max.

But someone of your experience I thought you would have known this. Lol

Phil

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[Jonathan]

The slots I'm cutting are 1.4mm wide and 1.3mm deep. (see my Gcode thread and look at timing pulleys program if you want to know exactly what's what...)

As a cutter that small is stronger radially than axially.

I think you meant stronger axially.

I think it's center cutting, not sure ... quite a big change to the code to do that but worth it I guess.

Where do you get the 0.01mm chipload number from, experience (if so good)? It's about the average value I found from checking various websites. I've used 0.025m chipload with 2mm 3 flute endmill successfully:

http://www.youtube.com/watch?v=p13LZ6IxmgY
(wrong title on that video!)

I may just grind a form tool to do this in the end, but it'll be nice to try it.

Experience! Only 7 years...much less than yourself I guess.