Issues with Swept Cut on sprocket

Discussion created by Roy Hultberg on Apr 22, 2020
Latest reply on Apr 25, 2020 by Dennis Dohogne

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Good Afternoon Gentlemen and Ladies,

Before begin, I would like to first have it noted that i am very new to Solid works and have limited experience as a CAD designer. I am currently designing a toothed sprocket for the owner of my company and am having issues with the tooth design arraying around the whole piece. I have been looking up tutorials online about creating Sprockets that have extruded radii off the main gear portion, which seems to solve the issue when making a Swept Cut. However my design will be flat and have a keyed center Extruded cut out, in turn this seems to cause an issue.

I hope these images depict the issue and hope that someone can help me with a somewhat easy to understand answer.

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J. Mather Apr 23, 2020 12:05 PM
Attach your *.sldprt file here.
What is the purpose of this sprocket?
For standard roller chain? If so, what size?
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- Roy Hultberg @ J. Mather on Apr 23, 2020 12:29 PM
  I attached the file In the comments down below, It is currently pending approval from a moderator.
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Frederick Law Apr 23, 2020 12:08 PM
You're cutting in a circle.
Revolve cut.
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- Krzysztof Szpakowski @ Frederick Law on Apr 23, 2020 12:12 PM
  Frederick, I like your answer but not you . You be faster!
  Of course I kidding
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  - Frederick Law @ Krzysztof Szpakowski on Apr 23, 2020 12:14 PM
    It ok, I'm not in a liking business.
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Krzysztof Szpakowski Apr 23, 2020 12:09 PM
Use "Cut revolve" command. As revolve center use axis sprocket
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Justin Pires Apr 23, 2020 12:15 PM
I'm pretty sure the path MUST intersect a point in the profile, but I could be wrong. As mather Suggested, attach your part so we can better help.
Also take a look here, the last post has a Design table driven sprocket, which could be valuable to you, if a little advanced. You should only have to change the Taper profile sketch for bicycle sprockets. I might add that to it someday
Parametric Sprocket.2
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- Roy Hultberg @ Justin Pires on Apr 24, 2020 7:01 PM
  Would you mind checking out the file i have down below, Im still not really sure what im doing wrong or what direction to head in.
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Roy Hultberg Apr 23, 2020 12:28 PM
Here Is the drawling file. Its not a sprocket with a chain, technically, its going to be a indenting tool for wood that is fixed to a rotating shaft.
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- Incisor Toothed Gear.SLDPRT.zip142.9 KB
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- Paul Salvador @ Roy Hultberg on Apr 25, 2020 9:26 AM
  Hello Roy,.. so, looking at your tooth profile it's a line (not a arc), and Sketch2 is applied to the side face of the tooth... so, this is not a "radial" cut (from the axis) but a "straight" cut (normal to the side face)? If so, then maybe place Sketch2 in the middle (Top Plane) and cut (mid)? (image)
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Krzysztof Szpakowski Apr 25, 2020 4:39 PM
Unfortunately I can't open your file - newer version. Yes, if teeth is like wrote Paul, you cant use "Cut Revolve" command.
But you can make like this:
1. Make "Extrude Boss" for one tooth (section of a gear)
2. Use "Cut Extrude" for make side profile
3. Make "Circular Pattern"
Its all. Or maybe smile and tea
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Dennis Dohogne Apr 25, 2020 5:15 PM
Many, many times it is a good idea to model the part in a fashion similar to how it will be manufactured. I would expect this part would to be made in this order: (With corresponding SWX model features)
1. Cut or stamp the disc with its center hole. (A simple midplane extrude.)
2. Turn the disc to add the custom bevels. (One revolved profile cut. Be sure to make use of symmetry in the sketches.)
Note: Steps 1 and 2 can easily be performed in one revolved profile.
3. Cut first tooth notch. (A simple extruded cut. Again, make use of symmetry in your sketch.)
4. Index the disc and cut the next tooth. (Use a circular pattern of the tooth cut.)
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Issues with Swept Cut on sprocket

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