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1. 
   trialnut | Jan 19, 2011 09:31am | #1

   clean and deburr

   Take the chuck off. Clean both surfaces well with laquer thinner or acetone then check for any dents or burrs. If any burrs are found simply remove them with a small file. only do the burr and as little surrounding area as possible. You want to maintain as much original surface as possible but remove any high spots that will interfere. Dents need to be looked at also as any dent will have raised metal around it from the metal being displaced when the dent happened. The metal had to go somewhere.

   Once you are satisfied that all high spots are removed, give everything a final wipedown with solvent. Then take some chalk and coat the male part with chalk. Lightly blow off the excess. Assemble everything back together and with a block of hardwood on the table use the feed lever to press the chuck back on the mandrel. Once it is together give it a couple good thumps to seat it. If it still contineus to come off after this treatment then something is either mismatched (wrong part) or it is being abused somehow. These setups are not designed to take lateral forces such as milling or drum sanders.

   Happy drilling