This is a reversible depth gauge foot for the iGaging IP54 EZ-Cal Digital caliper (or any other caliper with the blade dimensions of ~16 mm x 3.5 mm). It is reversible by rotating it 180 degrees -- the caliper will insert from either end of the foot. This allows the foot to be used in three orientations -- standard (90 degree, wide foot), reversed (90 degree, thin foot) and angled (45 degree, side foot).The IP54 caliper uses a small stop screw on the back/end of the blade; this foot has an additional channel to accommodate this. A centered 1/8" (3.18 mm) tap hole is provided for tapping threads for a thumb screw/fixing bolt -- the thumb screw used in the photos is a #8-32 x 5/8" knurled thumb screw. #8-32 screws/bolts are readily available in the U.S., mine was $0.23 at Ace Hardware). Most tap & die sets include this size of tap. This foot has been designed to be durable and rigid, especially when tightening the fixing bolt/thumb screw. It is thicker than most caliper depth feet, but it still fits in the stock removable accessory compartment included in the case. I 3-D printed the foot on its side to minimize warping on the critical faces. This does make some supports necessary in the blade channels and the tap hole. However, they are relatively easy to clean up with small hobby files and sandpaper. If you do frequent (or even occasional) 3-D printing, a set of hobby files comes in handy; they can be purchased for $10-$40. A flat piece of sandpaper on a flat surface also is useful for removing printing irregularities. This is particularly important on the critical feet surfaces (wide, thin & 45 degree). I like the softened texture that sanding provides, so I lightly sanded most surfaces with 400 grit sandpaper. That is why the photos don't show a shiny 3-D printed object. This design is the 5th revision, which varies slightly from the labelled diagram and the photos, which was version 4. Version 5 fits the caliper blade better and it is reversible top & bottom and front & back.
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