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| How do I prevent stringers when cutting aluminum on the lathe? |
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| Jonny:
Purely on past experience what is meant for cast iron is usually pretty good on aluminiums. Most aluminium tips have a radius. Apart from using a free cutting aluminium grade which will come off in smallish chips, i dont think you have any choice except to keep backing off. I changed a tip over today from a different make meant as a pure H13 tip to another make with a deep recess behind the cutting edge and larger rad. There are no chips now, massive unbreakable thick stringers after a few seconds, that wont disperse in to tray. A couple more secs and catches previous stringer wrapped around tool and tool post then wraps around job all within 6 secs. These tips were meant for free cutting aluminium. What i would suggest is try a decent brand tip uncoated with minimal relief behind cutting edge. Its easier to break the chips up. If you look and watch you will see fine cracks as its cutting. I do use a bullnose carbide tool for recessing a certain job with a lot of rake for clearance, chips are continuous and quite large but easy to break up. |
| Mayhem:
Did those inserts come with an indication on the depth of cut (ap) and feed rate (f) that the chipbreaker on is designed for? Good quality inserts will either have this information on the package or available in their product catalogue. I suspect that you may not be feeding them into the work enough for the chipbreaker to actually work. Try a different combination of feeds and depth of cut. |
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