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Homemade Flathead Screwdriver


BUILDER:
Adventures in Watchmaking on watchmaking.weebly.com
DESCRIPTION:
Homemade flathead screwdriver machined from brass hex rod and drill rod. Blade is hardened and tempered.
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Dec 26, 2016 2:13 PM
Toolmaker51
This makes a quality and efficient driver bit. On occasion where I need an odd bit, quick results are had by milling both sides of center-line against a four flute endmill. This produces a parallel form instead of a wedge. A simple calculation reveals the offset needed to generate thickness desired. If you have indexing tools, that allows conventional milling on both sides. Basic figures needed: rod diameter minus bit width plus 1/2 cutter diameter. Generally the 'length' of cut is about 2x depth of slot. Many assemblies have uniquely sized slots, especially shotguns. When a vintage example is engraved, all manner of precautions are taken to preserve that fastener.
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DIY Flathead Screwdriver - comment on how to build a Flathead Screwdriver - 1 comments
Toolmaker51 says:
Dec 26, 2016 2:13 PM
This makes a quality and efficient driver bit. On occasion where I need an odd bit, quick results are had by milling both sides of center-line against a four flute endmill. This produces a parallel form instead of a wedge. A simple calculation reveals the offset needed to generate thickness desired. If you have indexing tools, that allows conventional milling on both sides. Basic figures needed: rod diameter minus bit width plus 1/2 cutter diameter. Generally the 'length' of cut is about 2x depth of slot. Many assemblies have uniquely sized slots, especially shotguns. When a vintage example is engraved, all manner of precautions are taken to preserve that fastener.

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