In this part I will show you how I’ve designed the fittings used for the product Katana Sword. The approach to be taken for this kind of product is a Top-Down design also called Relational Design Method. That’s becasue all parts must fit exactly with the blade shape, therefore the Blade is used as reference source for external elements needed to create features on the other parts. That’s why, before to go ahead with designing the sword components it is necessary to create the Assembly file in which all these components will be created for the final product.
So, let’s create the assembmy file as follows:
Click “New” icon –>, pick Assembly Type–>choose the template mmks_asm_design (the parts will be created in the metric system) –> add the Blade part –>enter the Default as main constraint–>Click OK.
HABAKI – METALIC COLLAR
In assembly workbench, click on Create icon and create new part as follows:
Because everything must be related to the Blade part as reference, the Ref. Datum Planes for each part added to the Sword product from now on must be defined by clicking on “Offset Planes” icon (point 6) and accept the 0 mm default offset value for all 3 directions.
Before to add new features in the part make sure the Habaki part is active. Normally it should already be, but just in case is not, in order to make it active, click on its name in the model tree and from the pop-up menu click on the green star (point 10). Like that you can still see the entire assembly, you can also select any reference element from it but you only can add features on the active part.
Click on Extrude icon –>select the flat surface on the Blade and proceed with drawing a sketch on this surface with an offest of 0.1mm from the Blade edges. Then enter the parameters as follows:
Click again in Extrude icon–> Select the sidewise surface (green) and create the sketch by projecting the inner edges from the previous feature. For a better fit with the Blade Handle allow a small offset of 0.1mm for the central horizontal lines and enter the rest of the parameters as follows:
To add rounds it is not necessary to remain in Assembly file becasue no external references ar needed anymore. For rounds is much better to work in part file. So, in order to open the part file, click on the part name in model tree and from the pop-up menu click on the “Open” icon and proceed with rounds parameters as usual.
Add a nice appearance, for instance Gold polished and the part is ready.
SEPPA – METALIC SPACER
In the same way like for Habaki part, create a new part and rename it Seppa.
Click on Extrude icon –>pick the external surface from Habaki part and draw the outer profile as an elipse of 27×47 and project the same inner area formed by inner edges of habaki part.
Add one round of 1.5mm as shown.
Add a nice appearance like copper pollished and the Sebba part is ready.
TSUBA – METALIC HANDGUARD
Create a new part in the assembly workbench in the same fashion like for the previous parts.
Click the Extrude icon –> select the Seppa surface as external reference and sketch on it a circle of Ø 80 and project the inner edges from the Seppa part–> then extrud it 5mm as shown:
For Tsuba there are a lot of different decoration models available. You can either pick one or create your own. For this exercise I’ve picked the one shown in this picture.
So, to make it easier, instead of drawing this from scratch it’s helpful to insert this image (as png. file format) in your CREO file and sketch the profiles with the tools available in Sketch workbench by comparing the dimensions with the profiles seen in this image.
To insert an image png. file into CREO Parametric environment you can either stay in the Assembly workbench or better open the Tsuba part only and continue there.
For more clarity I recommend you to work in Single Part file. So Open the Tsuba part, switch to View Workbench and proceed as follows:
Once the image is inserted, it can be translated , scaled, rotated to fit with the chosen surface of the CREO part. For now keep the image with 50% transparecy and after all the profiles are sketched, the image can stay at 100% transparency.
Create the 1st set of cut-out as follows: Click on Extrude icon. pick one of the circular faces and guided by the just inserted image, start drawing the cut-out profiles, eventually make more accurate adjustments by adding the exact dimensions. Draw one fully closed section and mirror it in each of the other 3 squares. Then extrude everything to remove the material as shown:
Create the second set of cut-outs, as shown:
Remove material on both sides of the part with an Extrude of 1mm depth, as shown:
Add appearance, such as Metallic steel
…and the Tsuba part is ready.
KATANA SWORD Product
Add the second Seppa part to finish the 1st partial assembly:
At this design stage the Katana Sword is partially assembled and looks like this:
This design work is also available as video version on my YouTube channel as embedded below: