Trepanning, Ejector Drilling, Honing MIC Group's Trepanning, Ejector Drilling and Honing capabilities are a very important part of our manufacturing process. Many of the exotic materials MIC machines are not available in tubing form. Having these drilling and honing capabilities allow us to produce these parts from solid bar stock. MIC Group's Trepanning, Ejector Drilling and Honing capabilities are a very important part of our manufacturing process. Many of the exotic materials MIC machines are not available in tubing form. Having these drilling and honing capabilities allow us to produce these parts from solid bar stock.

Trepanning produces a hole by removing a "core", or solid piece of barstock, from the center of the bar. MIC can Trepan from 1.500" to 4.750" diameter from solid bar with reaming capabilities exceeding 6.500" and depths of up to 15' from one end. Pull boring is also utilized when OD to ID concentricity is critical. These machines are also used in Ejector Drilling operations.

Ejector drilling is similar to Trepanning but no core is produced. Using either disposable type or insert type heads, Ejector drilling can produce holes faster and deeper than possible with conventional drilling methods. In many instances Ejector Drilling can produce holes with size and finish accuracy that do not require any further machining. Size range for Ejector drilling is from approximately .75" dia. to 2.563" dia.

When hole size and finish become critical, MIC uses honing. Honing is most often used to follow the Trepanning and drilling operations. MIC's smallest hone is an auto-stroke hone with a diameter range of approximately .125" dia. thru 4" dia. For larger parts, a horizontal hone is used with a diameter range of 1.25" to 5", with a maximum stroke of 15'. MIC's largest hone has a diameter range of 2"-12" and a maximum stroke of 12'. All of these machines are capable of producing bores with extremely close tolerance and finish requirements.

As with many of the other special processes MIC offers it customers, "in house" Trepanning, Ejector drilling and Honing allow for better PRODUCTION PLANNING and QUALITY CONTROL by eliminating the need to rely on outside services.