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Fixing a part in an angled hole
william_frame
Member Posts: 8 ✭
In the linked document, I have created a block (Kingpin-Axle Block Ext) with an hole through it at an angle of 4.5 degrees. I want to fix the "Axle" part aligned in this hole. I can manually move it into close proximity of where it should be, but I can't figure out how to actually "mate" it in the correct position. If I mate it to the hole, it makes the axle perpendicular to the block. I want the Axle part to align with the hole that I created at a 4.5 degree angle to the face of the block.
This seems to be a reasonable thing that is needed in assemblies, I just can't figure out how to make it work. Any suggestion or help will be appreciated.
Thanks,
Bill
Best Answer
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Oliver_Couch
Member Posts: 172 PRO
Your hole is not cylindrical. It has a slightly elliptical cross section, so there is no single centre axis to align the shaft to, and I don't think onshape currently has the ability to make axes along the foci of an elliptical prism.
See:
You need to create a plane perpendicular to your extrusion direction then sketch a circle on that to extrude. Try using the point-normal plane creation tool. Or if you're a sadomasochist, you could do the maths to draw an ellipse on the vertical plane so that it creates a perfectly circular cross section when extruded off axis 4.5°.
0
Answers
Your hole is not cylindrical. It has a slightly elliptical cross section, so there is no single centre axis to align the shaft to, and I don't think onshape currently has the ability to make axes along the foci of an elliptical prism.
See:
You need to create a plane perpendicular to your extrusion direction then sketch a circle on that to extrude. Try using the point-normal plane creation tool. Or if you're a sadomasochist, you could do the maths to draw an ellipse on the vertical plane so that it creates a perfectly circular cross section when extruded off axis 4.5°.
Here's a sample with suggestions regarding build sequence. Building parts in place can save time and add to consistency since sketch entities can be reused. You won't have to wait until assembly to see how things fit. Also I recommend cutting flats for for axle mounting so that axle and (presumably) nut or some other fastener will be wanted. Bracket as sheet metal. Note also that this style needs less discrete planes since Implicit mates are available from many points on existing objects for sketching.
https://cad.onshape.com/documents/c6ec0f2dc63c1609a432a3e1/w/6b900bb82c5a10985e0d330f/e/4865d2d31e9552f4fd9dd6fe
Oliver_Couch
"You need to create a plane perpendicular to your extrusion direction then sketch a circle on that to extrude. Try using the point-normal plane creation tool."
That did it. Now it seems so simple. Thank you for the help. This forum is awesome: always several suggestions for solutions regardless of how simple or complex the question is.
Thanks,
Bill Frame