From DT Online
- drill just a few small holes
- drill pilot holes
- countersink holes
Features and Applications
Most have a Keyed Chuck which accept Parallel Shank drills with a capacity of up to 6mm diameter. The handle turns a large Bevel Gear which meshes with one or two smaller Pinions. The Gear Ratio provides the necessary Mechanical Advantage.
Young children may have difficulty drilling holes which are truly Square to the surface (e.g. of a disc to make a wheel). A simple Jig can be made which supports a Hand Drill within a sliding frame to assist. In use, one child operates the drill and another holds the work-piece to be drilled . . . . but . . .
Activity: Consider how to design and make a simple Jig to hold the work whilst drilling discs to make wheels - ideally one which 'self-centres' the discs.
|Draper 13841 8 mm Pistol Grip Hand Drill||Faithfull FAIHANDDRILL-TB 8.0mm Capacity Double Pinion Handdrill||Saver 0.5-8mm Mini Hand Drill with Keyless Chuck Pin Vise Model Hand Drill||Draper 13838 8 mm 3/8-Inch Chuck Double-Pinion Hand Drill|