We occasionally get calls about applications that are struggling to get adequate tap life. Generally the issue is incorrect hole size or tapping speed that is too fast. However, inadequate lubrication sometimes comes into play. This would seem easy to resolve, just add more lubrication and the problem goes away—correct. Well, not necessarily!
There are times we have to fight the law of gravity. We will see applications were there appears to be plenty of lubrication on the part. The problem is that Mother Nature does not always cooperate in getting that lubrication down into the holes that need to be tapped. Subsequently, there is lubrication all over the place except down in the hole where it is needed most. So what can be done?
Unfortunately, with blind hole tapping there is not much that can be done other that directing adequate lubrication down into the hole. However, through holes offer the opportunity to send lubrication up through the bottom of the part. By sending lubrication up from the bottom the lubrication is hitting the lead of the tap where it is most needed. The end result is better tap life!
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