John,
That's an interesting approach to cutting the appropriate groove for
the dies. For this particular project I think just having several
points of contact around the circumference where the pipe contacts the
ridges would be sufficient to support the pipe.
There is nothing critical about the looks or shape of the pipe. What
I'm trying to do is create a 90 degree bend in the 5/8" tubing which
is going to be used on the gas tank filler neck on my motorhome. I'm
adding a vent line so the tank fills easier (i.e. faster).
Thanks for the tip!
Brad
On Wed, May 18, 2016 at 9:32 AM, John Innis <jdinnis@gmail.com> wrote:
> Not sure about materials, but you don't need to shape your cutting tool, IF
> you are patient and careful. You can use a thin cutting tool and remove a
> very small amount of material from the center of where you want your groove.
> Then widen the groove until it is the diameter of the tubing stock. Then
> remove a small amount of material from the center of the groove and then
> widen the groove until is the width of your stock MINUS the change in radius
> for the depth of the groove. You can find the change in radius buy
> subtracting the dept of the groove from the width of the stock and
> multiplying by 2. Keep doing this and you get a successive approximation of
> a half circle groove. The less material you remove in each pass, the more
> accurate your radius will be. You can then clean up with a sanding tool if
> needed to remove any residual ridges.
>
>
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