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Small drill honing jig

Small jig for honing drills below 1mm

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Bazyle06/06/2021 17:44:02
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6173 forum posts
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I don't know the details but you mention the problem of drilling deep for the collets. I would think you would drill much larger from the back to within 2xD of the front then only drill the very end to size. Same as eg a 5C collet is not at holding diameter two inches deep.

Howard Lewis06/06/2021 18:42:09
5740 forum posts
13 photos

Derek's drawings show two sizes of jig. There are 6 sheets of drawings. (I have not made either jig! )

One is for drills up to No 42 (3/32" )

The collets are specified as being of silver steel, 4 mm diameter, with bores of 2.4, 1.9, 1.4, 0.9 mm. The four slots care 0.41 mm wide, and 25.4 mm long from the tapered nose..

(0.9 mm is listed in Zeus Charts as a No 65 drill )

The larger jig uses silver steel collets for drills up 1/4", which are 9.53 mm diameter, (3/8" in old money ) with bores of 1/4", 3/16" .

The four slots are 1.27 mm wide and 41.28 mm long, two from each end.

The mm sizes show that the original design was in Imperial units.

HTH

Howard

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