http://www.todaysmachiningworld.com/shop-doc-%e2%80%93-bore-dumb/ The Magazine for the Precision Parts Industry Tue, 07 Feb 2012 19:52:11 +0000 hourly 1 http://wordpress.org/?v=3.2.1 http://www.todaysmachiningworld.com/shop-doc-%e2%80%93-bore-dumb/comment-page-1/#comment-7931 Mike Mendola Tue, 27 Jul 2010 23:06:24 +0000 http://www.todaysmachiningworld.com/?p=5086#comment-7931 Chip control is another important factor. Unbroken or stringy chips can score the inside of the bore and/or deflect the bar so that it cuts oversize. Most insert manufacturers offer a variety of chipbreaker types to help with various materials. Also, use a boring bar with a thru-hole to apply coolant at the point of cut and to flush out the chips. The deeper the bore, the more important this is. Implied in your article, but not directly stated: Use the largest diameter bar available, consistant with having enough room for chip evacuation. Finally, check the pocket of the bar and the components holding the insert. Any movement in these may cause an over/undersize condition and surface finish problems. Mike Mendola GKI Inc Chip control is another important factor. Unbroken or stringy chips can score the inside of the bore and/or deflect the bar so that it cuts oversize. Most insert manufacturers offer a variety of chipbreaker types to help with various materials. Also, use a boring bar with a thru-hole to apply coolant at the point of cut and to flush out the chips. The deeper the bore, the more important this is.
Implied in your article, but not directly stated: Use the largest diameter bar available, consistant with having enough room for chip evacuation.
Finally, check the pocket of the bar and the components holding the insert. Any movement in these may cause an over/undersize condition and surface finish problems.
Mike Mendola
GKI Inc

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