The bearings are what make the cones on a Tricone spin.
There are four common types of bearings:
– standard open roller bearings
– air-cooled roller bearings
– sealed roller bearings
– sealed journal (friction) bearings.
Let’s take a look into these different types of bearings, and try to explain the differences.
Sealed Roller Bearings have some of the features of the non-sealed open bearings, but longer lifetime because the bearings are sealed with an O’ Ring Seal.
A lubrication and compensator system prevents leakage into the bearing system and stops the possibility of debris blocking the bearing as well as leakage of grease.
Standard open roller bearings are bearings without a seal.
This means that the bearings are open to outside debris, which can enter through the cone.
The advantage of an open bearing bit is that they are usually cheaper. They are ideal for drilling shallow holes, in the hundreds of feet. If drilling deeper holes with an open bearing bit you will probably have to pull it out every couple hundred feet to clean out the debris in the cones to free them up.
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Leave in the Hole bits are used for foundations, pilings, and anchor type systems where the bit is left in the hole and not retrieved.
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These bits have been specifically made for leave in the hole applications. They are unthreaded, which makes them less expensive and easier to weld to.