Best Bit for HDPE? - Router Forums
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post #1 of 16 (permalink) Old 05-26-2018, 11:46 AM Thread Starter
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Default Best Bit for HDPE?

Hello all,

For my business, I use Irwin (lowes) Crabide tipped roundover bit. I am repetitively routering 1/2" HDPE (plastic) and also using it on 1" and 1 1/2" schedule 40 PVC to make a smooth edge at the top. I am wondering if there is a better type or brand of bit that will last longer?
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post #2 of 16 (permalink) Old 05-26-2018, 12:16 PM
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Hello and welcome N/A...
Freud or CMT negative rake bits...
clean often and use boeshield or dry lube such as TriFlow......
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post #3 of 16 (permalink) Old 05-26-2018, 02:10 PM
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Most bits are better than Irwin. For straight bits the ones for plastics have “O” flutes but I’m not aware of any profiles that are specially designed for plastic unless the ones Stick mentioned are. If you can get negative rake angle that’s important. Avoid any blade or bit with a positive rake angle.

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post #4 of 16 (permalink) Old 05-26-2018, 06:44 PM
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Default Would pipe chamfering tools be useful

Quote:
Originally Posted by slyee07 View Post
Hello all,

For my business, I use Irwin (lowes) Crabide tipped roundover bit. I am repetitively routering 1/2" HDPE (plastic) and also using it on 1" and 1 1/2" schedule 40 PVC to make a smooth edge at the top. I am wondering if there is a better type or brand of bit that will last longer?
Would pipe chamfering tools powered by a cordless drill be useful too?
Works like pencil sharpeners.
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post #5 of 16 (permalink) Old 05-26-2018, 07:51 PM
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Would pipe chamfering tools powered by a cordless drill be useful too?
Works like pencil sharpeners.
I have several different types..
their primary usage is to chamfer the end of plastic pipe to make it easier for it to go into a cast iron pipe's hub adapter...
they don't radius... more of a straight taper...
they don't cut clean or uniformly especially if the cutter wobbles or is tipped a little......
did I mention they leave chatter marks???

This would have been the week that I'd have finished chewing thru the restraints...
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post #6 of 16 (permalink) Old 05-26-2018, 11:43 PM
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Quote:
Originally Posted by Stick486 View Post
I have several different types..
their primary usage is to chamfer the end of plastic pipe to make it easier for it to go into a cast iron pipe's hub adapter...
they don't radius... more of a straight taper...
they don't cut clean or uniformly especially if the cutter wobbles or is tipped a little......
did I mention they leave chatter marks???
Perhaps chamfer first and then round over with a router for a round-over finish.
It like making an octagon sectional blank with a bandsaw before sending the wood to a lathe for rounding.

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post #7 of 16 (permalink) Old 05-26-2018, 11:48 PM
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Quote:
Originally Posted by reuelt View Post
Perhaps chamfer first and then round over with a router for a round-over finish.
It like making an octagon sectional blank with a bandsaw before sending the wood to a lathe for rounding.
the OP wanted better and correct tooling to speed up the operation while saving time, labor and money...
not add steps and tooling...
those pipe chamferers are some crude tooling but they perform just fine when used as intended...
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post #8 of 16 (permalink) Old 05-27-2018, 07:32 AM
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Default plastic-cutting router bits

Some info on plastic-cutting router bits can be found:-

https://www.toolstoday.com/router-bi...uter-bits.html

Get the idea of the design as you can buy similar tools from other suppliers too.

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post #9 of 16 (permalink) Old 05-27-2018, 02:21 PM
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Quote:
Originally Posted by reuelt View Post
Some info on plastic-cutting router bits can be found:-

https://www.toolstoday.com/router-bi...uter-bits.html

Get the idea of the design as you can buy similar tools from other suppliers too.
I am not aware of any roundover bits designed specifically for plastics, and it is not for lack of trying. The bits referenced here much are more like bullnose or finger nail bits.

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post #10 of 16 (permalink) Old 05-27-2018, 04:17 PM
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I am not aware of any roundover bits designed specifically for plastics, and it is not for lack of trying. The bits referenced here much are more like bullnose or finger nail bits.
Two listed there are for PLASTIC edge rounding.
called: Solid Carbide Plastic 'O' Flute Router Bits for Edge Rounding
They do not look the same as the roundover bit (with bearings) designed for wood roundover.

https://www.toolstoday.com/solid-car...-rounding.html
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Last edited by reuelt; 05-27-2018 at 04:25 PM.
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