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Cribbage board design questions

Question asked by Dave Seiler on Feb 11, 2021
Latest reply on Feb 13, 2021 by Roland Schwarz

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I teach SolidWorks to middle school and high school aged students and I am hoping someone can help me with a couple things. I have a student that is trying to design a cribbage board onto an image that we brought into SW. Question #1- We traced the image with a spline and now having a hard time offsetting the traced spline. Is that possible? Question #2- If I cannot offset the spline, what is my next best option for creating a path for all the circles that are needing to be drawn in for the holes? #3- What type of patterning can I do to evenly space the circles, along the path that I create? Hopefully these questions make sense? If there is a much easier way of doing this, please let me know. Thanks!

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Craig Schultz Feb 12, 2021 8:48 AM
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Try drawing the path with just lines and arcs and then offsetting. Then you can convert the raceways into splines using the fit spline command.

Create the peg hole on one end and use curve driven pattern.
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Josh Brady Feb 12, 2021 8:48 AM
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1. Never played cribbage myself, but from all the images I'm pulling up on a Google search, it looks like the board is made up of lines and arcs. No need for splines?
2. You should be able to offset splines with no issue unless the curvature is so sharp that the offset would overlap itself or something.
3. A curve driven pattern will evenly space holes along a path. You need to create a curve from your sketched path using Insert->Curve->Composite. The sketch you use for the path must contain only one continuous path.
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Roland Schwarz Feb 12, 2021 9:27 AM
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Turn on the curvature comb for the spline. Look for inflection points and areas of tight curvature or rapid curvature excursions.

Take a close look at the spline. Most likely, it's a massive collection of too many defining points without any attempt to control direction or curvature at any point. Redo the spline with fewer points and more attention to tangency and curvature control. Better still to pre-establish key points and tangency lines in a layout sketch.

Make your spline in its own sketch and then close it. Don't try any offsetting or other design in the spline layout sketch. Offsetting splines seems to work better when offsetting splines from outside the sketch.
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Rick Becker Feb 12, 2021 9:41 AM
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The student is probably trying to recreate this board (or a similar version of it)...
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- Craig Schultz @ Rick Becker on Feb 12, 2021 9:45 AM
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  Then it would be easier to break it down into arcs so they can pattern in the 5 point groups.
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- Frederick Law @ Rick Becker on Feb 12, 2021 3:44 PM
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  Already found 1 point of fail offset.
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M. B. Feb 12, 2021 10:47 AM
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Dave Seiler, you haven't defined exactly what you want to do. If the goal is similar to what Rick Becker posted, then a style spline can be used with a 4 line sketch to create a surface sweep.
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Dave Seiler Feb 12, 2021 11:01 AM
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Thanks much for your replies so far. I apologize for not adding a picture of what we are trying to do. I didn't have access to that at the time of original post. Also didn't realize I would get so many responses right away, so thank you! Hopefully the attached works to open up to see what we have done. Basically, I will simplify my question then as to how do we get the holes set up on the part that we have created through a sketch picture that was added.
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- Cribbage Board.SLDPRT.zip309.3 KB
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- M. B. @ Dave Seiler on Feb 12, 2021 1:24 PM
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  With the file you posted I'm even more unsure of what you need help with.
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- Paul Salvador @ Dave Seiler on Feb 12, 2021 2:36 PM
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  ..yeah... offsetting is not going to happen with SW... your MROC is .005 so.. you'd probably need to do the offsetting manually or using another program which can interpolate the offset within sum ~approx?
  
  /...for instance.. using another program like... Rhino3D "Offset"
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  - Roland Schwarz @ Paul Salvador on Feb 12, 2021 2:34 PM
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    Could maybe extrude and then shell. Shell can compensate for things in a way that offset can't.
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    - Roland Schwarz @ Roland Schwarz on Feb 13, 2021 5:02 PM
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      Even if you could offset, chances are it won't look aesthetically pleasing. Perfect math isn't always perfect art. At this point I'd say you are better off eyeballing it and making it look good.
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- Mark Kaiser @ Dave Seiler on Feb 12, 2021 1:35 PM
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  This is your Cribbage board? Looks more like South America to me. Where is the path for the hole supposed to be?
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  - Dave Seiler @ Mark Kaiser on Feb 12, 2021 2:20 PM
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    It is the outline of a lake that the student wants the cribbage board on. I am sorry to complicate things with this question. You all have taken up your time to help and I thank you for that. I will try to explain one last time. If anyone wishes to respond I would appreciate it. If not, I understand. In order to lay out the holes on a path that I create, what is my best option. Disregard the outline of this image. I just need to be able to put in 2 rows of holes. Can I create a spline that cruedly follows the path of the lake and then pattern a circle along that path? As well as offset the spline to create another set of holes inside of that? I'm not sure if that is going to make sense either? Again, very sorry if I have wasted anyone's time on this. Have a good day
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    - Todd Blacksher @ Dave Seiler on Feb 12, 2021 3:39 PM
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      Dave Seiler wrote:
      
      It is the outline of a lake that the student wants the cribbage board on. I am sorry to complicate things with this question. You all have taken up your time to help and I thank you for that. I will try to explain one last time. If anyone wishes to respond I would appreciate it. If not, I understand. In order to lay out the holes on a path that I create, what is my best option. Disregard the outline of this image. I just need to be able to put in 2 rows of holes. Can I create a spline that cruedly follows the path of the lake and then pattern a circle along that path? As well as offset the spline to create another set of holes inside of that? I'm not sure if that is going to make sense either? Again, very sorry if I have wasted anyone's time on this. Have a good day
      Here is an example -
      This is how I did it:
      Use lines/arcs to roughly follow the outline
      Use Select Chain to select all of the segments
      Turn them into construction geometry
      Use Fit Spline to turn it into a single spline
      Use bi-directional offset to get the outside splines
      Use the segment sketch tool to place points evenly around the splines
      
      note: I didn't use fit spline until after I offset the chain, and I used it on both offsets.
      (I didn't think about doing it to the original entities until I was writing this.)
      
      Hopefully this will get you going in the right direction.
      t
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    - Josh Brady @ Dave Seiler on Feb 12, 2021 4:11 PM
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      Dave Seiler wrote:
      
      It is the outline of a lake that the student wants the cribbage board on. I am sorry to complicate things with this question. You all have taken up your time to help and I thank you for that. I will try to explain one last time. If anyone wishes to respond I would appreciate it. If not, I understand. In order to lay out the holes on a path that I create, what is my best option. Disregard the outline of this image. I just need to be able to put in 2 rows of holes. Can I create a spline that cruedly follows the path of the lake and then pattern a circle along that path? As well as offset the spline to create another set of holes inside of that? I'm not sure if that is going to make sense either? Again, very sorry if I have wasted anyone's time on this. Have a good day
      Basically, as long as your spline is "smooth" enough, yes, you can offset it. And you can turn each spline into a curve, and pattern your holes on the curve. As per my first post in this thread.
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    - Jim Riddell @ Dave Seiler on Feb 13, 2021 2:27 PM
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      Dave Seiler wrote:
      
      It is the outline of a lake that the student wants the cribbage board on. I am sorry to complicate things with this question. You all have taken up your time to help and I thank you for that. I will try to explain one last time. If anyone wishes to respond I would appreciate it. If not, I understand. In order to lay out the holes on a path that I create, what is my best option. Disregard the outline of this image. I just need to be able to put in 2 rows of holes. Can I create a spline that cruedly follows the path of the lake and then pattern a circle along that path? As well as offset the spline to create another set of holes inside of that? I'm not sure if that is going to make sense either? Again, very sorry if I have wasted anyone's time on this. Have a good day
      My '15 for 2' (sorry, couldn't resist) would be to ensure that each spline path were broken up into 24 segments, equally spaced along each path. Then I would pattern 6 holes along the path with the 6th hole at the 'zero' or crossing point of the first segment. Delete the first hole in each pattern and you'll end up with evenly spaced holes.
      Suggestion, identify your pegs first so you get the hole size correct.
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  - Josh Brady @ Mark Kaiser on Feb 12, 2021 2:33 PM
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    Also looks like Luigi....
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Todd Blacksher Feb 12, 2021 2:30 PM
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I wouldn't even try to offset the perimeter of this, I would recommend drawing your "tracks" with lines & arcs roughly following the outline of the shape - It will make it much easier for the hole groupings.
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Dave Seiler Feb 12, 2021 7:44 PM
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Thank you all very much for your help! I think I am on the right track. I am not as familiar with bringing in pictures into SW and manipulating them. Seemed like everything I was trying was not working. Thanks again for your help. You have all been awesome!
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M. B. Feb 13, 2021 12:58 PM
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Some CAM software programs are able to generate NC tool paths with the programmed end mill radius being larger than a radius on the spline which would essentially be an offset. I don't know if SW CAM can do that or not.
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