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AR15.COM
3/29/2017 8:44:39 PM EDT
What is the best tool of grinding down hard plastics?  the piece to be cut down is small and narrow and part of a bigger piece; only a few milimeters need to be grinded down , so it has to be very fine and precise tool; and able to make a cut that will leave the surface as flat and straight as possible
3/29/2017 8:50:44 PM EDT
[#1]
Would a 4" grinder with a sandpaper flapper wheel work? Pretty simple to get stuff flat and straight and they come in multiple grits...
If you need smaller same deal but go to a dremel tool..
3/29/2017 8:53:14 PM EDT
[#2]
How big is this piece?
Do you only need to do this to one piece or is this a production?
3/29/2017 8:54:04 PM EDT
[#3]
3/29/2017 8:55:48 PM EDT
[#4]
3/29/2017 9:00:25 PM EDT
[#5]
Depends on the plastic. A lot of them melt and gum up with the heat of grinding or sanding. I find sharp high speed wood tools work well.
3/29/2017 9:03:19 PM EDT
[#6]
Quoted:
What is the best tool of grinding down hard plastics?  the piece to be cut down is small and narrow and part of a bigger piece; only a few milimeters need to be grinded down , so it has to be very fine and precise tool; and able to make a cut that will leave the surface as flat and straight as possible
View Quote


I'd use a file or Emery board.
3/29/2017 9:05:04 PM EDT
[#7]
If I understand correctly, you want to precisely remove some surface of a long, flat piece? A woodworkers drum sander sounds like what you might need. I don't know  if that would work due to heat, and gumming up the sander though.

A woodworker's scraper plane might accomplish what you want.
3/29/2017 9:32:06 PM EDT
[#8]
i need a small tool...the piece i want to cut down is inside an opening with only about an inch or 2 wide

i wouldnt have room to use a file or something like that.
3/29/2017 10:09:33 PM EDT
[#9]


Might help if OP showed us what he's trying to modify...
3/29/2017 10:26:37 PM EDT
[#10]
Use a hand file.

If it's small and access is restricted, use a hand file.

They sell all sorts, some with teeth on only one face so the others faces don't accidentally cut into adjacent surfaces.

Use a hand file.
3/29/2017 10:35:01 PM EDT
[#11]
Quote History
Quoted:
Would a 4" grinder with a sandpaper flapper wheel work? Pretty simple to get stuff flat and straight and they come in multiple grits...
If you need smaller same deal but go to a dremel tool..
View Quote
In my experience, high RPM disk sanders will just melt most plastics.
3/29/2017 10:40:29 PM EDT
[#12]
so the red part is what i want to trim away, the cut out should be straight lines. keep in mind there is limited manuverability as the object in question is 1-2 inches.
3/29/2017 11:03:35 PM EDT
[#13]
If I'm reading your chart thing right, I'd probably use some type of dremel burr
3/29/2017 11:15:12 PM EDT
[#14]
Jewelers or modelers files