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John.Pryal1-Visitor
1-Visitor
August 30, 2012
Question

Reference pattern problem

  • August 30, 2012
  • 2 replies
  • 6690 views

Hi all,

i wonder if anyone can explain the results i am getting with a reference pattern. i need the second pattern to reference the first pattern, so that if i change the number of holes or angular spacing in the first pattern, then the second pattern automatically updates. What i also require, is for the holes in the second pattern to remain normal to the revolved surface as the first pattern member does, the rest start to wander all over the place. This is what i need explaining, why is this happening? & is there a simple way to over come this? I have come up with a solution myself, but it means not using the reference pattern function, but instead having two separate patterns, & linking them by relation, but its long winded & not simple like i had hoped.

I have attached the part in the hope that someone may have an answer.

Regards

John


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2 replies

B
Bari14-Alexandrite
14-Alexandrite
August 30, 2012

Hello John,

Just create the Intersect Feature in the first patterned group and it will work.

qwe.jpg

J
John.Pryal1-VisitorAuthor
1-Visitor
August 30, 2012

Hi Antonio,

yes that just worked for me, the only disadvantage is i end up with more features than i really would like. Thank you for your reply.

Regards

John

B
BrianMartin13-Aquamarine
13-Aquamarine
August 30, 2012

Hi John...

I think you're taking the wrong approach to this particular problem. I've remodeled the part with what is, in my humble opinion, a better technique.

The key to the solution was your statement "What i also require, is for the holes in the second pattern to remain normal to the revolved surface". If you're creating holes and you want them to stay normal to some crazy surface, the first thing you should think it "On-Point Hole". This is a special hole type that doesn't appear on the hole type drop-down menu. The only way it appears is if you select a datum point as the first hole reference... but there's a catch, the datum point has to be an "on-surface" datum point.

Luckily this completely works for your situation.

I remodeled your part and attached it in Creo 2 format. I'm not sure which version you're running... it looked like Creo. I should've created it in Creo 1 but I wasn't thinking when I made it. If Creo 2 doesn't work for you and the instructions below don't help, let me know and I'll remodel in Creo 1.

First... delete the intersection and the second pattern. Next, try this (click each slide for a larger image)...

Slide1.PNG

Slide2.PNG

Slide3.PNG

Slide4.PNG

Slide5.PNG

Slide6.PNG

That should give you everything you needed including all original dimensions. You're able to use a simple hole rather than a revolved one. You're also able to eliminate the hole depth and allow Creo to control it automatically. You don't need the intersection... and you can easily hide the datum points by layer.

Hope this helps!

Thanks!

-Brian

J
John.Pryal1-VisitorAuthor
1-Visitor
August 30, 2012

Hi Brian,

thank you for the reply, that indeed works & appears to work well, definitely food for thought. The only disadvantage i see with your approach is in the detailing, i would have to manually add the angular dimensions for all the normal holes, they require these in our shop. The model i posted was a very basic example, in reality the cavity is more complex & there are many more rows of holes, so creating all these angular dimensions would be a pain. FYI still using Creo elements/pro

Kind regards

John

B
BrianMartin13-Aquamarine
13-Aquamarine
August 30, 2012

Ah! I'm using Creo Elements/Pro, too! I wish I'd have known...

You may look into creating the angular dimensions as annotations... and then just ref patterning them along with thre holes. This actually does work. I've done it before on other models. This way you get the reference dimensions you need while using the on-point method.

The cavity can be super complex... and you will always get a normal hole using the on-surface datum point. You can handle many rows of holes, too.

If you need examples, let me know!

Thanks!

-=Brian

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