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Small drill honing jig
Small jig for honing drills below 1mm
| Bazyle | 06/06/2021 17:44:02 |
 6956 forum posts 229 photos | 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 Lewis | 06/06/2021 18:42:09 |
| 7227 forum posts 21 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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All Forum Topics > Workshop Tools and Tooling > Small drill honing jig