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Thread: Sparks when face milling ?
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30th October 2020, 10:00 AM #1Most Valued Member
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Sparks when face milling ?
I noticed a few sporadic sparks flying when face milling a 20mm wide piece of mild steel plate.
Cutter and setup:
IMG_6429.jpg
From a different angle:
IMG_6431.jpg
The mill is small, Optimum BF20 (DIY LinuxCNC conversion):
IMG_6432.jpg
Surface finish:
IMG_6433.jpg
The surface looks worse than it is, feels very smooth using finger nail.
Using a 50mm insert cutter running at 1600-1700RPM with a feed of 100mm/sec and cutting depth of 0.2mm. Using WD40 as cutting compound.
The mill specification states max cutter size is 63mm, but that's optimistic at best and a blatant lie at worst, the machine really isn't rigid enough for large diameter (>20mm) cutters.
I see a few sporadic sparks during the cut, not many and mainly near the start/end. The sparks are not the star shaped type you see on a grinder, just a single bright orange glowing small blob.
The tramming of the mill is not perfect, but very close.
My questions:
Is this normal? What makes it spark? How can I prevent these sparks?
Any help/opinion/views would be much appreciated.
Thank you for reading my post.
Attached Images
- IMG_6433.jpg (12.8 KB)
- IMG_6429.jpg (43.6 KB)
- IMG_6431.jpg (12.2 KB)
- IMG_6432.jpg (47.1 KB)
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