Chef's Choice 615 Locating Pin (part number S610306)

Description

I wanted a replacement for the Chef's Choice 615 slicer "locating pin" (the part the blade screws into) that would use the original screw. I found a part here on Thingiverse (see remix link), but it used custom threads, and there were other things I wanted to change. So I am giving credit to the original author, but this has been changed quite a bit. The first thing I did was to add spokes to the design. This provides a lot of additional strength to he very thin (2 mm) cap into which the screw goes. The original design is almost guaranteed to fail because is it so thin. A side benefit of these spokes is that I can print the part without any supports because an FDM printer can easily bridge those small gaps. I then created my own custom thread. The original part thread is almost a 20mmx1.5mm, which is contained in the Fusion ISO Metric Profile threads. However, to get it just right, I created custom threads by copying the XML file for that profile and then modifying the 20mx1.5mm section. Here is the XML code for that section: <ThreadDesignation>M20x1.5</ThreadDesignation> <CTD>M20x1.5</CTD> <Pitch>1.5</Pitch> <Thread> <Gender>external</Gender> <Class>6g</Class> <MajorDia>19.85</MajorDia> <PitchDia>18.924</PitchDia> <MinorDia>18.137</MinorDia> </Thread> <Thread> <Gender>internal</Gender> <Class>6H</Class> <MajorDia>20.803</MajorDia> <PitchDia>19.721</PitchDia> <MinorDia>19.126</MinorDia> <TapDrill>19.1</TapDrill> </Thread> <Thread> <Gender>external</Gender> <Class>4g6g</Class> <MajorDia>19.85</MajorDia> <PitchDia>18.949</PitchDia> <MinorDia>18.162</MinorDia> </Thread> </Designation> <Designation> The only thing different from the original are the four lines located in the Internal, 6H section. All four of those values are very slightly larger. The resulting fit is (he says modestly), perfect. I pretty much completely redesigned the original Fusion 360 design. I added constraints and also parameterized the design to make it easy to tweak parameters simply by typing a new number into the parameters dialog rather than editing each sketch. I tweaked a LOT! The result is a part which matches the original part pretty closely. The one excpetion is that I kept from the original designer's choice to not have the threaded tube completely independent from the outer structure. This uses more plastic and also makes the part a little more rigid, but I don't think that matters. I have included the Fusion 360 f3D file so you can make additional changes, if you wish. I kept the "arm" in my design (it is the nib that sticks out of the side) but as near as I can tell it has absolutely no function other than to make it easy to quickly line up, during installation, the pin holes on the part with the pins on the slicer casting. My guess is that this was added to the design so that the people assembling these slicers could get the part installed a little more quickly. I did remove the bent part at the end of the flap because keeping it would have meant using a support. I printed my prototypes in PLA, and the final part using PETG because it is closer to being food-safe, and because I have found that it stands up better to force, at least in other applications. If the part fails, then I will spend the money and send the design out to a service that can print it in nylon, like the original part.

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