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This 316 stainless steel cylinder is 144 in. long with a bore size of 8.5 in., and with a main section wall thickness of 1.5 in. The part was finish bored, honed, and machined at American Hollow Boring Co. with total indicator runout under 0.010 in. in the bore. With the bore complete, all other finished features were made according to the drawing.

Machining / Cutting

Deep-Hole Geometry, As Machined

Feb. 13, 2014

When drilling very deep holes, it’s important to allow enough stock for clean up after a worst-case runout of 0.001 in. per inch. A part that is 180 in. long should allow more than 0.180 in. for clean-up in the bore.

CMM and QC

Deep Hole Geometry, As Specified

Jan. 30, 2014

For finish-bored holes, the standard for accuracy is 0.001-in. run-out per foot, or better. Precision straightening may be employed before or after drilling a hole. Honing is used often to provide uniform size and finish.

Machining / Cutting

Beyond the Rough, Finish-Bored Hole Straightness

Jan. 15, 2014

There are options for boring rough holes: straight through from one end to the other, from either end, or in steps.

Machining / Cutting

How Straight Will the Hole Be?

Jan. 9, 2014

Geoff Ginader

President

http://www.amhollow.com/

Geoff Ginader is the president American Hollow Boring, an independent machine shop specializing in deep-hole drilling and large part machining for industrial applications that range from heavy machinery to defense projects. He enjoys solving complex machining problems, and experts at AHB are available to review specific projects.