Need Help!- Drilling with a router

[THend]

I have a Porter Cable 890 router on my 3 axis K2 machine. The slowest setting is 10,000 rpm, and I am using Precise Bits drill bits designed for cnc with their collet.

I am trying to drill 0.25 holes in HDPE, about 3/4 inch deep.

I get build up of material on the bit, and by the third hole or so, it has a negative impact on the drilling.

I am of the idea I need to slow the bit down? Or, I am thinking of peck drilling so the material cleans out.

I am using the drill cycle, can't recall the #... but it is standard.

I could use some advice..

[ger21]

I use G83 with 1/4" upcut spirals to peck "drill" in wood.

Should work with the drill bits.

And I use the same router.

[THend]

I planned on trying peck drilling next..

The holes are to be tapped for 1/4-20, so they need to be right on.