| My chuck keeps coming out of the drill |
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Chuck Coming Out It often happens that the tapered chuck mandrel can shake loose while drilling large holes (giving rise to 'chattering'), sending the chuck flying. This can damage equipment and cause injury. This can also happen when using the WASP sander - a disturbing occurrence. Avoid both of the above by seating the taper firmly. Follow these steps below. 1. Wind the jaws of the chuck up inside the chuck body. 2. Place a piece of mild steel plate - 3 mm to 6 mm thick - flat across the end of the chuck - aluminium or copper may also be used. A piece of wood, plastic, or similar material is not suitable - too soft - we are after a sharp jolt here. 3. Take a large hammer - preferably heavier than the chuck if possible. We want a controlled firm blow - not a wild swing with a lightweight hammer. Mallets (wood, rubber, plastic) are also not suitable for the same reason as above - we want a sharp jolt. 4. Take a few slow practice swings with the hammer through an arc to establish aim - note the grip suggested in the picture below. 5. Give a firm sharp blow to the plate held on the end of the chuck - don't worry about your drill bearings or the head casting - they can take it. NOTE: If the problem persists it's likely that repeated dislodgement of the mandrel in the past may have damaged your tapered hole and/or mandrel. If this is the case you may need to clean up the hole with a reamer (No. 2 Morse Taper). You may also need to replace the damaged tapered chuck mandrel if it can not be cleaned up sufficiently with a file and/or abrasive. We have heard of some people, in desperation, using a metal adhesive to secure the tapered mandrel within the bore. We don't recommend this unless all else fails, but certainly don't use the maximum strength variety (these adhesives are available in different types and different strengths). |
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