Planarsrf Not Working

Contents.Creating a pencil sharpener in RhinoIn this tutorial you will learn how to model a Winnie the Pooh Pencil sharpener. The sharpener itself is the component that will be embedded into the 3D printed model. I made every part on a different layer. This makes it easy to make adjustments or to hide parts.

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Creating the sharpenerFor embedding the pencil sharpener it is necessary to determine all the measures to make sure it will fit in the structured design. Using a calliper will do the job! Recreating the alien part will help you to clearly see how it will fit in your design.Step 1 Draw a solid box on the top view.

Then make a line to trim away the slope. Use the 'BlendSrf' command to close the top. Make a cylinder and use the 'Split' command to split the circle surface. Drag this a little inwards and then use 'BlendSrf' (mark for the options: position).Step 2 The sharpener is slightly curved on both sides. To make this draw a control point curve on the top plane and mirror this by drawing the mirror axis along the center. Trim away the sides of the sharpener by selecting the curves as cutting objests.

Use 'EdgeSrf' to connect the top surface to the bottom and closing the sides (closing the gap in between).Step 3 Join the surfaces together.Creating screw threadFor this part I used the following youtube tutorial(part 1 &2):Making the positive partStep 1 Start by making a solid cylinderStep 2 Create the cross section curve with the control point curve option.Step 3 Use the 'Helix' command to create a helix. Make sure that Osnap is turned on (having End, Mid en Cen selected), so that the helix can be made from mid to end snap.Step 4 Go to the tab Transform, select Orient, select Perpendicular to Curve. Now add the cross section curve you made in step 2 to the helix, by selecting the Midpoint of the cross section.Step 5 Use the Sweep1 command (make sure that roadlike top is selected in the options).Step 6 Scale the cylinder first in 1D (extruding) and then in 2D making it slightly wider).Step 7 Make a cap on the sweeped cross section to close it, using Solid, 'Cap Planar Holes' command.Step 8 Select the cylinder and the helix and use the 'BooleanUnion' command to make 1 whole.Step 9 Select the helix part and make a fillet. After that use 'Chamfer' for the bottom part of the cylinder.Making the negative partStep 10 Make cylinder on the top plane that is bigger than the first cylinder. Use 'BooleanDifference' command to create the inner part of the cylinder. The negative part will now be just the same as the positive part from its inside. Make sure the Option says: delete difference=No!Step 11 Scale2D the positive part a little smaller, because you will otherwise get a tight fit.

Tolerances are important and can't be ignored!Step 12 Make a hole in the positive shape by creating another cylinder and using the 'BooleanDifference' command again.Making the support structurePlace the sharpener inside the positive shape as a reference to model the support structure.Step 1 Draw with controlpoint curve and polyline the following shape in the top view. I had a little opening where the lines should meet. If you encounter the same problem: Go to the Curve menu and choose Fillet Curves. Make sure that the radius is set at 0 and the Join = Yes option is selected. Then select both the lines that needs to be connected.

Pehla nasha song. Join the lines after that.Step 2 Make a surface from the curves using the ‘Planarsrf’ command. Extrude the curve to your liking using the sharpener as a reference. I made sure that it is 2 mm longer than the sharpener. Make sure that you leave 1 mm open on both sides of the sharpener.Step 3 Use 'BooleanUnion' command to make a whole from the extruded curve.Step 4 Repeat step 1-3 for the other side.Step 5 Close the extrudes with the 'Cap' command.Step 6 Make the opening in the positive shape by drawing a solid cylinder on top of the hole of the sharpener in the top view.

Then use the 'BooleanDifference' command to make the hole. The positive shape of the pencil sharpener will look like this:Step 7 Make a solid box between the two pillars and then use the 'BooleanUnion' command to connect everything together.Creating Winnie the Pooh headStep 1 On the front and on the right plane, place background bitmap pictures of Winnie the Pooh. You could also use Wireframe Picture command. These pictures will serve as a reference for constructing the head.Step 2 Trace the head in the front plane with the control point curve.Step 3 Revolve the trace around a line you draw in the z-axis in the middle of the head. Make sure that the option deformable = yes, so that the head can be deformed later on.Step 4 Press F10 to turn on the control points (you can also type the command 'POn'). Now the head can be deformed by selecting the control points and adjusting them according to the reference pictures.Step 5 To create the ears first draw a solid sphere, then select the sphere and rebuild with the following options:Pointcount 8, degree 3, select delete imput and retrim.Step 6 Now you are able to press F10 to turn on the control points and deform the spheres. Use Front and Right view to make adjustments to the ears.

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Select multiple control points when you want to move certain parts of the sphere, for instance making the ear hole effect by dragging the selected points inwards.Step 7 Draw two lines that intersect with the bottom of the ear and the side of the head. Use the 'Trim' command to trim away the parts that needs to be connected.Step 8 Use the 'BlendSurface' command to connect the ears to the head. In case it does not work: Use the 'Gap' command to close the ears and the head and then do a BooleanUnion operation to make sure it will be one surface (this is what I had to do).Making the faceStep 1 Trace the eyes, nose and mouth in the front view, using the reference image. Then use the ‘ExtrudeCrv’ tool to extrude the curves. The extrusions should intersect with the face.Step 2 Use the ‘Split’ command to split the mouth and the nose. This will keep the surface of both the nose and the mouth. With the Gumball on, drag the surface of the mouth a little inwards and the surface of the nose a little outwards.

Use the ‘Trim’ command to make holes for the eyes.Step 3 Use ‘Loft’ to make the edges of the surfaces fitting to the edges of the holes the surfaces made on the head.Step 4 Use the ‘Cap’ command for closing the eyes. (Or make an eyeball by making a sphere, rebuilding it to have more control points, deform and make it fit the hole with a BooleanDifference operation).Step 5 Draw a cylinder, bigger that the circle that contains the support structure for the sharpener. Use the BooleanDifference command to make a hole at the bottom of the head.Adjusting the head on screw threadStep 1 Draw a control point closed curved shape on the front plane. This will be the cross section for the collar.Step 2 Revolve the cross section and Scale 2D. Make sure that this part intersects with the head and with the screw thread.Step 3 Use the BooleanUnion command to make it into a single part.Step 4 Create a box of 80mm/40mm/50mm on a new layer and make sure all the parts fit into this box.Congratulations!!! You have now finished the tutorial!

I hope you are happy with the end result!Some tips regarding some problem that might occur: If you can't do a BooleanUnion operation, probably your surface is somewhere not closed. Remember that Boolean operations only work with Solids, so everything must be closed! Put the background pictures also on a layer, then it is easy to switch them on and off. For the screw threads make sure that you make the cilinder of the positive part smaller than the negative part. The crosssection for the helix should also be a bit smaller, but leave the helix the same size as the negative!Keep on working with Rhino!

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