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

thingiverse

I wanted a replacement for the Chef's Choice 615 slicer "locating pin" (the part the blade screws into) that would use the original blade screw (the reverse-threaded part that has a big slot that you can put a quarter into to tighten the blade). 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. BTW, the original Chef's Choice part number for the locating pin for the 615 is S610306. It is still listed on their parts site, but they no longer sell it, even though they are still selling the 615 slicer. The first thing I did was to add spokes to the design. This provides a lot of additional strength to the 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 the small gaps between the spokes. I then created my own custom thread. The original part thread is 1.5mm pitch and 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 20mm portion of 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 exception is that I kept 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. I used ridiculously fine 0.08 mm layer heights in order to make the threads really smooth and to also make the outside hub, which contacts the blade, as smooth as can be, both to reduce wear, and also reduce the possibility of foods getting into the little layer ridges. 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.