Problem constraining Flat head screws?

I have tried several things to position a flat head screw, but without
success. Is there a trick to this?

The top of the screw should be below the surface of the part. The edge
between the shoulder and the shank should also be below the "break"
edge in the hole. I have thought about the potential of adding a plane
but this is still contingent upon how the hole was made.

My first appoach was to attempt to constrain the conical surface under
the head to the conical surface in the hole. But, this doesn't seem to
work. Is this a bug? Does anyone know if SW is planning to add this
as a constrait?

Thanks,

 

Make sure that the conical angle of the flathead are the same as the
csink. You can then mate the conicals coincident. Another way you could
do it is to put a sketch point at the point of the cone on the screw.
Then you could mate the point coincident to the csink with a concentric
mate of the screw shaft with the hole.

 

Rather than making the conicals coincident, I make the circular edge
coincident to the countersink. It has the plus side of being able to still
mate the screw as it will be in real life even if the angles don't match.
On the other hand, you may not notice that the angles don't match.

Another advantage of either way is that it only takes one mate to put the
screw in place. Granted, it doesn't constrain it rotationally, but I
usually leave those free anyway.

WT

 

How about just setting the distance from the top of the hole to the top
of the screw?
It's not 100%, but should be plenty adequate.

 

I would add a Primary Mate Reference with a mate reference type of any to
conical surface
when you drag it into assembly, fastener should snap to a concentric mate
with countersunk hole.
You do not say what version you are using.Works on 2006 SP4.1. Concentric
mate is established regardless of different angles between components.
Wayne's suggestion for height positioning is probably the easiest to apply.

The Mate reference box gives the user the opportunity to establish a
primary, secondary, tertiary mate all in one shot, but I have never been
able to get it to work the way it's descibed in the help subject. Seems to
have been half baked/broken now for many releases - sigh.


Neville Williams
Z-Axis Design - NZ
"remove the KNOT to reply"

 

Great! Thanks guys!

I checked the angle of the C'sink and when I got it to match with the
screw it worked great, and as expected... Always some little trick.

Thanks for the help.