Draft angle limits

Hello,

is it possible to get rid of the draft angle limit in Pro/E WF. Currently it
is +/- 30 degrees (at least in my system). But sometimes I have
applications, where I need more, say 60 deg. So, is it possible to
reconfigure something somewhere to get it done? I am aware that usully there
is no need for that big draft angle values, but what are the reasons why
there are limits? Kernel does not support it or is it something else?

In other cad packages, we are using (for example Solid Edge), there seems to
be no limits for draft angles.

Regars,
rex

 

: Hello,
:
: is it possible to get rid of the draft angle limit in Pro/E WF. Currently it
: is +/- 30 degrees (at least in my system). But sometimes I have
: applications, where I need more, say 60 deg.

First, nothing in Pro/e prevents you from making an angle of walls that you need
with blends, sweeps, variable section sweeps, etc. You can do this either with
solids or surfaces, straight or curved sections. There are really no limits and no
reason that I can see to be so attached to this one, admittedly limited, way of
creating angled features.

: I am aware that usully there
: is no need for that big draft angle values, but what are the reasons why
: there are limits?

Whether the kernel supports it or not, the limits are there because Pro/e's
approach to part and tooling creation is pretty conservative and conventional. One
of the things that impressed me about it from the beginning was how much feature
creation resembled similar manufacturing processes. When you needed a hole, there
was a hole function and when you were done, you could see the drill point and the
correct geometry of two holes drilled in a manifold block at right angles. The
approach is the same with draft, a fairly narrowly defined way of creating angled
walls to facilitate the release of parts from molding tooling. Pro/e's adherence
to conventions in part and tooling creation dictates the 30 degree limit, the
limit shown on any draft angle chart I have ever seen. Here, for example, is such
a chart from DME, maker of mold sets and mold bases for plastic injection molding:
http://www.dme.net/wwwdme/tech/Draft Angles.pdf

For the most part, although the chart shows up to 30 degrees considered as draft,
I have not seen angles this large, even on the rough forming stations of
multi-impression forging dies. The dies start out with large draft angles on
walls, then through several stages, reduce the angle while forcing yellow hot
metal into narrower and sharper cavities. Even the coring features of large, deep
cores rarely finished at greater than 3 to 5 degrees of draft. Plastic injection
molds have even smaller draft angles than this. And, in general, the overall
tendency is to try to reduce draft angles to the minimum because of the effect
they have on feature size. So, Pro/e and its approach agree with industry and
tooling engineering standards. You seem to want to ignore this and have adopted
draft angle creation as a generalized, non-specific method of creating any angled
wall. However, it wouldn't serve part or tooling engineering to lose sight of the
specificity of drafts.

David Janes