Originally Posted by ImanCarrot  Sub contract it to China, they don't care about health and safety. I get a particular high index polymer blank from there- no- one else will melt and cast this particular plastic.
Run it cool, two flutes rather than 4, climb cut rather than conventional cut. Slower spindle speed and good chip extraction (air or coolant). You should be able to catch the chips comming off like to-nails and they should be no more than warm. If it stats clogging in clumps you're melting it.
Oh, and extraction. I use an 8 inch flexi tube right near the cutter venting to the outside. Paper masks won't help with fumes...only particles and even then they get holes in them after about 10 minutes breathing.
With PVC Hydrogen Chloride is your main problem but only if there's lots of it I think. See below. Hydrogen Chloride (HCl) is similar to Phosgene (COCL2) in that it reacts with moisture in body tissue (like lungs) to make Hydrochloric Acid. which reminds me of a poem by Wilfred Owen "Gas, Gas, Gas" or "Gas Boys Gas" can't recal which.
http://www.twi.co.uk/content/faqkg006.html
[Edit] Owen's poem was "Dulce et Decorum Est" if anyone fancies seeing what gas did in WWI.
http://www.warpoetry.co.uk/owen1.html
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i don't make enough of these for that. just a 16 year old with a hobby.
PVC is done. i heard you guys loud and clear.
safety is always #1. switched over from pvc to hdpe (hope it has the tensile strength though...)
Thanks for the fast and great responses
Reed