Product category:
Deburring, de-flashing and fettling
News Release from: Finishing Techniques | Subject: Deburring cross-drilled holes
Edited by the Manufacturingtalk Editorial
Team on 12 February 2007
Cross-drilled holes' burrs problem
solved
Deburring the intersection of cross-drilled holes in cam shafts was a difficult task - solved by applying an automated, orbital deburring device in the machine tool.
Ford Australia has solved the problem of removing burrs in cross-drilled holes by adopting the Orbitool in the production of camshafts Orbitool is available in the UK exclusively from Finishing Techniques and managing director, Jonathan Dean, believed the Ford experience can benefit all engineers struggling with the difficult to remove burrs while needing to maintain high volume production
This article was originally published on Manufacturingtalk on 30 Jan 2002 at 8.00am (UK)
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"Ford's search for a solution was prompted by an increasing number of engine problems arising from Ford Geelong in Victoria, Australia.
They quickly found that left-over burrs in drilled holes became unattached and sometimes jammed the cam variable timing system," explained Dean.
Clearly this needed a technically viable way of removing the burrs without slowing production.
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Okuma Australia Pty, a key equipment supplier to Ford Geelong, was set the task of finding a deburring solution that would not compromise the rapid cycle times required.
Leigh Milvain, technical and engineering manager of Okuma, commented, "Our search for a solution soon led us to the Orbitool.
We saw it allowed intersecting holes to be drilled and then deburred - importantly, this takes place on the same machine.
We developed a turnkey system for Ford with automated materials handling and a floor-to-floor time of 60 seconds." This is quite an achievement as each camshaft required eight radial holes to be drilled and deburred.
The holes have a diameter of 4mm and are drilled within two 5mm-wide circular grooves having a root diameter of 28mm.
There are four holes in each groove.
The rear holes break through into the axial holes on a PCD, while the front holes break through into the central bore.
As the component is inserted in the machining centre, a vision system takes readings on any misalignment of the axial hole pattern.
A Kirby drill then makes the radial holes, following which the Orbitool deburrs the intersections of the cross-drilled holes.
If the quality of the hole is uniform after drilling, then the Orbitool programme produces a finished part to the required standard.
"Deburring the intersection of cross-drilled holes has been a notoriously difficult task and usually one that compromises productivity.
However, the Ford experience shows that this need not be the case.
The Orbitool solves these problems and soon pays for itself in saved production time," concluded Dean.
The Orbitool is manufactured and patented by J W Done in the USA and is available in the UK from Finishing Techniques.
A range of options allows the device to be easily tailored to individual operations.
Technical specifications and online demonstrations can be downloaded.
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