Small slot in plastic?

[MIKE_B]

Hi all!

 

Have a job here that I need to put a .042 wide X .180 deep slot in. The part dimensions are .228 wide x .300 high x 18.00 long. Using a slittling saw is not really an option by the way I plan to hold the part. I'm looking to do this with an endmill. The material is UHMW Polyethylene. My plan is to double side tape a sheet down and mill the parts complete leaving a couple thou at the bottom so not to break through. Does anyone know of a good tool to use for this slot and suggestions on speeds and feeds? I have a 240000 RPM Robodrill I plan on using.

 

Thanks for any suggestions

Mike

[dougm]

MIKE

Try these guys

http://www.pmtnow.com/

look at the pcb single flute endmills

Doug

[MIKE_B]

Doug

Thanks for the link but I didn't see any single flute endmills

[CNCGUY]

WOW!! 240,000 RPM j/k

[GoetzInd]

http://www.harveytool.com/products/index.p...s&category_id=1

 

 

This is where we get our single flutes from. Although they dont have one under .04. A regular 2flt should work. Very light DOC as to not load up the tool. I would use all of that 24K on a 1/32 tool.

[GoetzInd]

quote:

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WOW!! 240,000 RPM j/k

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At 240K that machine would start to lift off!

[MIKE_B]

You guys don't miss a thing

 

24,000 it is!!

 

What kind of chip load can I put on a 1/32 endmill in plastic? 24000 with a .001 chip load at .020 depth of cut is a little slower then I wanted to go.

 

I'm rethinking this one. The small depths of cut are going to kill me in cycle time. I'm thinking of just holding this in a couple of vises and using a keyseat cutter. Did not really want to go this route but the cycle will be much faster

[GoetzInd]

I would even say .02 Doc is a bit much. Your right, if your making qty. than a saw would be the way to go. Faster, cheaper, no chance of snaping a few $20 end mills.

[dougm]

Mike

http://www.pmtnow.com/

go to

-PMT tools

-endmills

-pcb endmills

-1 flute teflon

they dont have .042

will .046 work it will cut small

24k at .002-.003 rev

.03 depth of cut

blow air in the slot

ya have to push uhmw to cut it clean