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Troubleshooting Drill Head Pneumatic Controls
Question
One of the seven heads is not holding its position when engaged. I can visibly see the bit push back up into the cylinder slightly while a hole is being drilled. This results in a hole that is not being drilled full depth. What are some possible causes and remedies to this problem? Forum Responses
-Air leaking in the shaft cylinder for the drill bit in question, also could be a broken or weak pressure spring inside of the air cylinder. -Wrong drill bit type. -Dull drill bit. -When gang drilling the motor to the drill bank might be slowing down due to excessive feed and load. -Gear might be worn out for the spindle in question.
From contributor S: Expounding on Contributor A's comment, make sure you don't have the LH bit in a RH spindle and vice-versa. It's unlikely, but check the simple things first. From the original questioner: Thanks for the quick responses. Yes, I did check the rotations. The bit is sharp and there's no burning. It's the correct bit in the correct spot. I tend to think it’s a leaky seal somewhere. From contributor J: I would also check the air valve that actuates the spindle to come down. As mentioned above, if you have a seal in the cylinder that is leaking, it cannot maintain its position. The same will happen with a valve that is not completely shuttling position. From contributor R: Swap the airline to the cylinder with a known good one, that way you can narrow it down to cylinder or valve.
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