Це відео не доступне.
Перепрошуємо.
Machining Delrin (Acetal) vs UHMW - Lathing
Вставка
- Опубліковано 6 жов 2011
- This video is to show the difference in the machining (lathing) characteristics of delrin (Acetal) vs UHMW (Ultra-high-molecular-weight polyethylene)
It's true Delrin/POM/Acetal machines much nicer then UHMW but you're not giving it a fair chance. Your stickout is way too long, neither plastic would machine well that far from the chuck without tailstock support. Primary problem you have is that tool is not biting into the material and it just rubs making heat and melting the plastic away. As others pointed out, sharp HSS tools will do much better then carbide which is made slightly dull on purpose.
Also, and much more importantly, you're using your hand to slow down the chuck. I made that mistake the first time I touched the lathe and I count myself lucky to have walked away with just a slap on the wrist. I also hope I'm not dumb enough to ever do it again - it's a great way to lose finger... or hand... or arm depending on how (un)lucky you are. I'm not trying to be safety freak here, and it's your hand to use it as you see fit but showing it in a public video is inexcusable. Someone new to the hobby will see you doing it and not knowing better try the same... maybe with jaws sticking a bit proud of the chuck body just for good measure
A properly sharp hss tool will perform much better than carbide in polymers. Carbide is good for machining harder materials as opposed to high speed steel. Just a friendly tip
True but there are polished inserts for machining aluminium, brass and plastic which perform much better on pom.
-Why not use your tailstock when machining UHMW ?
-When comparing 2 materials, then make circumstances the same (stick out sucks at UHMW).
-A tripod would have made a huge difference, nevertheless appreciate sharing your vid, cheers
Makes total sense. UHMWPE is an extremely wear resistant low friction polymer which is why the bottom of snowboards and skis are made from it - hence it resists machining. Delrin is very tough, hence used for M16 rifle butts.
There is to much sticking out of chuck , you had delrin short in chuck . Uhmw is deflecting. Not a fair test
My eyes are actually hurting from focusing on the blurred subjects
I think I'm seasick too! LOL! Sadly it's one of the few videos online about turning UHMW, but I will be posting one while using a tripod and less glare soon. It won't be a comparison, just a single material with multiple process trials to find a decent cutting profile. Wish me luck, looks like I'm going to need it ;)
UHMW when cut with Steel Tools results in a finish as smooth as Glass. High RPM & Steel Cutters. I found Delrin to be soft in comparison to UHMW. Turning Nylon makes a continuous stringy cutting.
Your tools are sharper than your camera focus !
And that's not saying much ;)
Just got done a job using this stuff when someone ordered it instead of Delrin because it was cheaper. Ya can't use carbide insert tools. Ya need to go old school. High-speed steel tool bit ground 15deg top and side , and RAZOR sharp. I ground mine on my surface grinder. Stoned it mirror smooth. Heat/friction is your enemy. Run about 200rpm and .005" feed per rev. Comes off like plastic wrap off the roll.pb68slab
How many rpm’s for that delrin? Parting tool recommendations?
did the fellah say what rev;s he was using with the Delrin?.
Outstanding video! Thanks so much for this!!!! 😃👍
can this acetal use as mechanical seal?
Higher speed / feed, HSS, 0 degree rake.
Great info. Thanks for posting!
Which one is stronger compressing against the fibers vs across from them?
Basically compressing them long ways?
What fibers? These are solid polymer chunks.
I think I had a job that called for UHMW. It cut pretty well with flood coolant.
I think I'm going to order some of this for a model im making. Im making an old torpedo with rivets on the sides. My question is would glues work on this material? Like hobby glue? I like the idea of how nice it is to machine. Just concerned i won't be able to glue anything to it.
No, very difficult to stick
You'd want to mechanically bolt it down somehow, not glue it.
Is Delrin more brittle than UHMW?
you had better results than i did.. my o.d. surface finish looked like a thread...
any tips would be greatly appreciated
@@zztuber6164 Probably was copolymer?
Thanks much..... very nice
what is he making? I only know of delrin paintball bolts, and those sir are not.
Bushings for automotive Suspension Components
uhmw works really well as bushings . if you are in need of UHMWPE pls email me at Claire@uhmwpes.com
You know you're watching amateur content when they don't know the difference between facing and turning.
Acetal seems graphite/carbon filled.
Use a positiv tool and very small nose radius (0.1 mm )
You Just need a polished sharp tool . The radius does not matter.
Just trying to help :)
Put it in the freezer over night
Jesus, hold the goddamn camera steady already.
Sorry, amateur hour :(
Awful stuff,Acetal is a pleasure to work with.
There are so many things wrong with this video. You should have used sharp tools with proper rake and relief angles, more appropriate surface and feeding speed etc. That being said Acetal machines nicer than UHMW but that demonstration was hard to watch.