Mating to a sketch circle

I'm still pretty new to Solidworks, but I'm having trouble with
something that should be pretty simple and I'm obviously going about it
the wrong way.

I have a series of framed floor panels arranged in a circle (the top of
a 37' turntable). The framed panels sit on top of a length of angle
steel that is rolled to a 35' diameter. To fasten between the panel
and the angle steel, we weld a unistrut 90 degree bracket to the deck
panel frame and a mating bracket to the angle steel (the unistrut
brackets are handy because they're pre-punched for 1/2" bolts). After
brackets are welded to the panel & angle steel, a 1/2" bolt fastens the
to parts together.

My problem is locating the brackets correctly on the frames of the deck
panels. The center of the holes in the bracket needs to land on a
circle that is offset (1.0625") from the exterior edge of the bent
angle steel. I've offset the edge of the angle steel and have it
referenced in the 'deck panel assembly'. However, I can't seem to
create a mate between the sketched circle and the hole of the bracket.
I've placed reference points in the bracket part, but when I select the
point & the sketched circle, no mating options are available.

A picture of the deck panel assembly and circular sketch can be found
at:
http://www.creativeconners.com/assembly_outer_wedge.jpg

Any advice would be appreciated.

 

Hi Paul,

Thanks for the response.

I just tried adding a sketch point at the center of the bolt hole, and
it doesn't seem to have any better result than placing a 3d reference
point. When I select the sketch point & the sketch circle and try to
add a mate, all the mate options are greyed out.

 

If this is the first part in your assembly its possible that it was
inserted in a "fixed" position. If you cannot drag the part, thats likely
the case. Right click the part in your assembly tree and "float" it.

 

Hi Brian,

Thanks for responding. It is not the first part in the assembly, and
is floating. I can drag it around manually, and I can mate it to other
components but I cannot create a mate to the sketch. I could have
sworn that I've mated parts to reference sketches in the past, I'll try
some more experimenting to see what I've goofed up.

 

The only solution I've found was to offset a line from the panel
framing member in the reference sketch that intersected the existing
sketch circle. This gave me an intersection whereby I could insert a
reference point. With the reference point in place, I could mate it to
the bracket's hole center.

I'm still a confused as to why I could not create Coincident mate
between the sketch circle and the bracket hole center. My current
solution is cludgy at best, any pointers would still be welcome.

Thanks.