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Clever use of your resources. Machining delrin to a nice finish is tricky, but it can be done. Is that why you are sanding, to get a better finish?
If so, then guiding the inevitably long/ stringy chip away from the cutter to prevent it from wrapping works well. No need to move to sanding.
Remember to remove the water from the lathe!

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This makes me happy. Every time I hear about a southern team working outside, I get jealous. But none of those teams would be able to use this solution, so maybe us northern teams aren't so bad off after all. :p

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And over here on the West Coast, I find the North/South divide bizarre! It's all (comparatively) warm here, from Seattle to San Diego!

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We do this all the time to keep our drill bits cold when doing tons of cheese holes, and along with a little cutting oil, it works great.

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Says the girl from Palo Alto :p

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I checked the Seattle weather, it was 55F at 11pm. :p

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!!!
How is that possible? Connecticut is considerably farther to the south than Seattle, but I'm still inside my house freezing inside a winter jacket.

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The jet stream pulling cool not cold air from over the ocean onto land?
Seems possible to me.

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It's going to be 65º all week over here! It's great!

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Hey we have problems down here too. The massive Florida humidity causes our drill bits to rust out within a single season, and it wreaks havoc with PLA and nylon filament. The extruder on our printer practically steams with all the absorbed moisture. :p