Yesterday I made this adaptor for connecting a drill chuck to a brace to allow bits with round and hex shafts to be driven. The chuck came from a burnt out electric drill and is threaded 3/8” x 24 TPI UNF.
I have tried it out as follows;
- ¾” “wood “ twist drill in iroko,
- 15/32” “metal” twist drill in ¼” thick bright mild steel,
- 76 mm holesaw in melamine faced chipboard,
- 38 mm holesaw in hornbeam,
- 30 mm Forstner bit in hornbeam.
All worked OK. The big holesaw required quite a lot of effort to turn it but I think it is much safer than using a hand-held electric drill where a sudden jam can cause wrist injury. I found that a very sharp bit was needed for drilling the steel.
I have tried it out as follows;
- ¾” “wood “ twist drill in iroko,
- 15/32” “metal” twist drill in ¼” thick bright mild steel,
- 76 mm holesaw in melamine faced chipboard,
- 38 mm holesaw in hornbeam,
- 30 mm Forstner bit in hornbeam.
All worked OK. The big holesaw required quite a lot of effort to turn it but I think it is much safer than using a hand-held electric drill where a sudden jam can cause wrist injury. I found that a very sharp bit was needed for drilling the steel.
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