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Drill bit keeps coming loose - Drills

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When the drill bit on a hammer drill keeps loosening up one of two things is happening. 1. The chuck is worn out and needs to be replaced. 2. The chuck is not tight enough before you start drilling. If you have the style of chuck that requires a key do not be bashful about using maximum force to tighten the chuck and move the chuck key from hole to hole and tighten it in each position. Joe

Posted on May 08, 2010

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Posted on Jan 02, 2017

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1 Answer

Why does my chuck keep loosening


First check whether you have the correct transmission setting for the bit you are using. This may affect the range over which the chuck operates and how it locks onto the bit. A conventional small-diameter drill bit may not work with a hammer drill setting. If the setting is correct, then either your hands aren't as strong as they used to be and you're not getting the chuck tight, or the chuck is worn and no longer has enough friction to hold.

Try this diagnostic: when you put a bit in, use a fine-tip felt marker to draw a line from the chuck collar (the part you turn to tighten or loosen) to the chuck baseplate. If the bit comes loose, check to see if the collar is still lined up at the same place relative to the baseplate. If it is, the chuck pieces are slipping inside; perhaps the transmission setting is incorrect for the bit chosen. If the collar has worked loose (the marks didn't stay lined up), the threading on the collar or the parts it engages could be worn.

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dear sir

please use drill bit remove key with drill machine and try to turn it anti clock vise then your bit will being loose and you can remove it easily .

thank you
hope answer the question
please vote !

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