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OTIS_STEVE1-Visitor
1-Visitor
March 6, 2019
Solved

Need suggestions for an alternate process to patterning within sketcher

  • March 6, 2019
  • 2 replies
  • 3016 views

I recently followed a youtube tutorial for creating a pinion gear. (sketch a circle/sketch a tooth on diameter of circle/create 4 center lines/mirror tooth over 4 center lines so you have 6 equidistant teeth / delete line segments / blend - import sketch, scale down, rotate, repeat / complete blend) basically a twisted gear.

 

Instead of just 6 teeth I would like to do 50.  It would be tedious to create dozens of center lines and 50 mirror steps etc.  I thought if I patterned a single tooth about an axis I could easily create 50 evenly spaced teeth.

 

The problem I have now is the original sketch (single circle and tooth) and the patterned teeth are not part of the same sketch and therefore are not a closed shape suitable for using in a blend.   It would seem a pattern function WITHIN sketcher would solve this but that seems like a no no in Creo.  Can someone suggest how I can achieve this?  Basically I need to make a sketch and a pattern somehow merge together so I can modify it as I would a single sketch.

Thanks!

 

EDIT:

The only work around I've found is to create a new sketch on a new plane, project the existing sketch and pattern onto this new plane/sketch and now it behaves as "one sketch".  kind of clunky. 

 

 

Best answer by StephenW

Are you really needing everything to be in one sketch? Why not break it down to one tooth profile. If you are trying to model a 3D part, it's not ideal to try to do everything in one sketch. If you were able to create one tooth profile, create your blend from that, then you can pattern the tooth feature around an axis.

 

I may be way off on my response, if so, maybe you could clarify your question.

 

2 replies

StephenW
StephenW23-Emerald IIIAnswer
23-Emerald III
March 6, 2019

Are you really needing everything to be in one sketch? Why not break it down to one tooth profile. If you are trying to model a 3D part, it's not ideal to try to do everything in one sketch. If you were able to create one tooth profile, create your blend from that, then you can pattern the tooth feature around an axis.

 

I may be way off on my response, if so, maybe you could clarify your question.

 

O
OTIS_STEVE1-VisitorAuthor
1-Visitor
March 6, 2019

That's definitely the simple approach my brain was completely missing. I'm an EE so that probably explains it.  I created my single tooth sketch, completed my blend and then patterned the tooth.  This worked well for small numbers of teeth, less than 6.  As I increased the pattern above 6 it began taking Creo a long time to regenerate and most of the time it just plain locks up.  So this technically works though Creo seems to be working really hard.

 

EDIT: OK that was my error, I was forcing the pattern to do 10 teeth at 90 degrees.  Once I selected for it to be spread out over 360, it regenerated fine.  

StephenW
StephenW23-Emerald III
23-Emerald III
March 6, 2019

Hahaha!

 

@OTIS_STEVE wrote:

... I'm an EE so that probably explains it. ...

Patriot_1776
Patriot_177622-Sapphire II
22-Sapphire II
March 6, 2019

There's no easy answer to this.  First, there are plenty of creo gear models on the web.  Also, how accurate does this have to be?  Does is just have to LOOK like a gear tooth or does it actually have to be accurate enough to hob the gear from?

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