Hemmingway Sensitive Knurling Tool

This is a picture of my completed “Sensitive Knurling Tool” built from the Hemmingway kit/plans. All parts (Except knurling wheels and screws) were machined manually and hand filed/finished.

Main body, milled, drilled and corner rounds filed.

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Layout on arms.

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Drilling symmetric rounds on arms

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Milling excess material

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Drilling hole located partially on the part using sacrificial block

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Reaming

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Setup on rotary table to rough machine curves on arm components

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Rough grinding rounds on belt sander

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Finished using hand file and sane paper

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Adapted drill press to spindle sander for finishing internal radii

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Laser cut angle jig to locate arm component in vise.

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Deep slot for knurling wheel milled

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Some parts ready for test assembly.

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Fitting cap and lever onto eccentric shaft

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Quick split collar clamping fixture to hold part in lathe for second operation

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Course adjust screw and assembly

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I found that when adjusted to its larger settings, the feed adjuster side plates would often touch the side plates in the circled area. This caused the assembly to bind.

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I fixed this by taking a little bit more material off the step on the inside of the side plates.

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All the parts ready for assembly.

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Here’s a link to a short video of me assembling the tool.

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Here’s the first test knurls. I have a set of fine straight and fine diamond wheels.

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