CO/Tech ZJ4116-J11 User Manual (English)

Questions and Answers:

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Jenna GilmoreAug 15, 2025
Why is my CO/Tech Drill so noisy when running?
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  dominguezryanAug 15, 2025
  The noise could be due to several reasons. It might be caused by wrong belt tension, which requires adjusting the tension. Another cause could be a dry spindle, in which case you should lubricate the spindle. Also, check for a loose spindle pulley and ensure the lock nut is tight, tightening the screws if necessary. Finally, a loose drive belt pulley could be the culprit; tighten the set screw on the pulley.
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brett81Aug 18, 2025
What to do if my CO/Tech ZJ4116-J11 Drill bit overheats?
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  Katherine JonesAug 18, 2025
  If your drill bit is overheating, several factors could be the cause. First, check if the speed is wrong and change it accordingly. Also, if no swarf is coming from the hole, lift the drill often to clean it. A blunt drill bit will also cause overheating, so sharpen it. If the feed rate is too slow, increase it. Finally, ensure you are using a suitable lubricant or coolant, as a lack of lubrication/cooling can cause overheating.
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Alyssa ClarkAug 22, 2025
How to fix a CO/Tech Drill bit that wobbles?
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  Sarah MurrayAug 22, 2025
  If your drill bit is wobbling, consider these potential causes: a bent drill bit (replace it), a worn spindle bearing (replace the bearing), a drill bit that's not straight (insert the drill bit correctly), or a chuck mounted incorrectly (mount the chuck correctly).
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sandra71Aug 26, 2025
Why does the CO/Tech Drill bit wander and the hole not round?
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  Dwayne BrowningAug 26, 2025
  If the drill bit wanders and the hole isn't round, it could be due to a knot in the wood or an unsymmetrical sharpened drill. Sharpen the drill bit correctly. Another potential cause is a bent drill bit, in which case you should replace the drill bit.
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Dale ZamoraAug 28, 2025
What to do if the CO/Tech Drill bit sticks in the workpiece?
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  Robert BuchananAug 28, 2025
  If the drill bit sticks, it could be because the workpiece "grabs" or there's too much pressure; support or clamp the workpiece. Alternatively, the belt tension might be too low, so adjust the tension.
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Stephen HernandezSep 1, 2025
Why won’t the chuck stay in place on my CO/Tech Drill?
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  Jack LopezSep 1, 2025
  If the chuck won't stay in place, it's likely due to dirt, grease, or oil on the taper in the chuck or on the spindle. Clean the chuck taper and spindle with a suitable cleaning agent.
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Raymond McphersonSep 4, 2025
How to prevent splinters when drilling with my CO/Tech ZJ4116-J11 Drill?
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  mistymackSep 4, 2025
  To prevent splinters, place a piece of waste wood under the workpiece.
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Lisa SnowSep 7, 2025
Why does the spindle on my CO/Tech Drill go up too slow or too fast?
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  Amber BarrSep 7, 2025
  If the spindle goes up too slow or too fast, it's likely due to wrong spring tension. Adjust the tension accordingly.