Uwe:
Yeah, a router occurred to me after I posted; l’ll look into this.
Bill
On Sat, Aug 25, 2018 at 7:31 AM Uwe Klein <uwe@xxxxxxxxxxxxxxxxxxx> wrote:
Am 25.08.2018 um 15:16 schrieb William Claybaugh:
Uwe:
That’s a very clever idea that might well work. I’ll have to find
someone with a large enough mill, but that might work.
IMHO you would not do that on a mill but with a
hand held (smallish ) router.
Build a tool that keeps the router coaxial with the tube.
use a cylindrical router bit that has been profiled for the task.
just had a look:
https://www.amanatool.com/57120-carbide-tipped-countertop-no-drip-with-ultra-glide-radius-bearing-guide-solid-surface-1-inch-dia-x-1-1-8-x-5-16-angle-x-1-2-shank.html
You are probably "about there" when you reduce the guide roller diameter.
you then run the tool on the outside for one tube
and on the inside for the other tube.
I use NOVOTEX ( phenolic / fiber composite ) for
little bits and pieces and it submits reasonably
well to carbide tipped router bits.
Beware the dust.
Uwe