Troubleshooting Drill Head Pneumatic Controls
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?
-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 itís 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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