Tag Archives: Chamfering

Extended Heule Defa Tool Saves Scrap

An aerospace contract shop had an expensive problem – producing a front and back countersink by hand on a magnesium housing resulted in parts being scrapped. At $15,000.00 a part, the problem needed to be corrected more than fast.. Just to make thinks more interesting, the location of the countersinks on the part required over 14 inches of reach from the top of the tool to the face of the holder for clearance. Using a stock standard Defa front and back chamfering tool from Heule Precision Tools allowed the customer to machine the 90 degree countersink in their horizontal machining center, solving the problem. We provided specs to the customer to help them build their own extension, I’ve attached a few photos of the tool. Heule Precision Tool’s twin bladed Defa tool allows for adjustment of the chamfer diameter on the tool and allows for toleranced chamfers and countersinks from 4mm to 44.5mm.

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Snap Tap – Heule Tool Brings It Home

Ran a successful Heule Tool test today in A36 steel, using a Snap Tap tool with a TiAlN coated carbide insert.

Here’s the set up: Cat 40 vertical mill, 9mm drilled hole, followed by an M10 roll form tap. The tap was “pushing” a burr on the backside of the part that could only be removed with a countersink on a drill press.

Two problems with this program: 1. Handling the part twice.

2. Pushing the burr back into the threads. The no-go gage was getting a workout.

The fix: Only Heule’s Snap Tap tool can cut a chamfer large enough to allow a tap to produce a thread and still leave an edge break. We ran a   Snap 5-9.0mm tool cutting an 11.5mm diameter chamfer at 1600 RPM and around .008″ per rev. Results: consistent front and back chamfers, parts came off clean, no drill press, no Q.C. complaints about messed up threads.

Snap Tap is a stock standard offering for tap sizes from M6 to M12. Everything is run on a performance guarantee…

Front and Backside Chamfering from Heule Tool Company

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