Sanding/Grinding plastics?

[kartracer55]

More delrin fun!

Anybody have anytips for doing this???? Filing the stuff takes FOREVER because its so damn "slippery" Im using some 56 grit on a 5inch disc sander (5500ish RPM) Anything I can do here? I figure finer grit will only make it worse. I need to remove material, but not enough to cut it off. Any tips/suggestions? I must say, aside from sanding/grinding, this stuff is a dream to work with. Easy to machine, drills and cuts like butter

Thanks


Jim

 

[Darren M.]

Any chance you can use a drill press like a mill?

 

[Luckydevil]

Maybe a dremel cutting bit? Not exactly sure what you are trying to do. Are you trying to carve it or just keep the same shape and remove a layer of material?

You might have better luck with a belt sander.

 

[kartracer55]

They say thats pretty dangerous because the chucks are a taper fit. Enough of a side load and apparantly they will break thier "seat" and fly off. Ive never seen it happen but you can run delrin pretty fast so that would be a pretty violent thing lol. Mills have a taper fit as well but its more or less to hold the endmill or cutter in place. They have a draw in bar to pull the collet into the spindle which clamps down on whatever you have in the collet at the moment.


Still not sure about those guys with the drum sanders in thier drill presses though, probably for wood only


Luke, Im trying to remove a layer of material. I tried a burr on the die grinder but the stuff is so damn "lubricative?" that it just kind of glides barely takign anything off even with a decent amount of pressure

 

[JayB]

Try a router mounted in a table. Use a 2 or 3 flute bit. It will make quick work of Delrin. It works mint for me.

 

[bamatj]

not sure what shape your working with or how much your wanting to take off but you might try this. if its ''flat'' get some 2 sided tape and put it on something as flat as you can find. then put down the roughest sand paper you got on it. you can change the paper several times before you need to change the tape. like i said though not really sure exactly what your doing. maybe it might help ya?

 

[kartracer55]

Thats a pretty good Idea! The high speed sander was just sorty of melting it.


I got it though. Rotary FILE (like for wood) its much more aggresive than the burrs are so I was running them about half throttle on the die grinder (so just below 10k rpm?) and keeping it cool with some windex (Like I had to when machining)

I found this works the best for grinding out shapes, and the method above would be pretty good too.


So I found that you should...use a rotary file, decent pressure, about half throttle and cool it with windex. A bit of trial and error but I got it!


Jim