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Modern solid carbide drills produce holes in a tolerance zone of H8-H10; in which case the hole axis is accurate in half this tolerance. For eg:- A dia 10 hole drilled hole is between 22-45 microns which means the axis is controlled within 11-22 microns.
Reamed holes are accurate having a tolerance of H6-H7 i.e. for dia 10 :-11 to 16 microns, so it is obvious that to produce such an accurate hole , the hole axis has to be more accurate than 11-22 microns which is possible with a modern solid carbide drill, hence for such accurate holes it is a preferred process to Hole-mill & then Ream.
A Hole-mill is normally an undersized reamer with a boring geometry i.e. the size of the hole-mill is normally 0.2-0.6mm more than the size of the drill so that there are no drill marks on the hole plus the hole axis is corrected for subsequent reaming operation.
The stock for reaming is different for each type of material.
Steel & CI 0.3-0.4 mm
Aluminium 0.5-0.6 mm
Titanium 0.2-0.3 mm
Aayudh Hole-mills are optimised for geometry based on the materials to be hole-milled and are generally straight fluted.
To enable us to offer the right geometry, coating etc. please fill out the form below, enter Your email ID and click ‘SEND‘, we will revert promptly with a preliminary offer by mail or by our Sales Engineer, who after studying your application would submit our final offer for your actions. You can also download and take a printout add your values and Email to marketing@aayudh.co.in
Application Input Attachements : If you have more than one file please zip it and then attach. Attachment file should not be more than 5mb
Solid Carbide Tools are normally PVD coated to enhance their performance in terms of Tool Life and Productivity. Aayudh Tools will decide the PVD Coating based on your application and your inputs. In case you have any specific prefernce please specify in the Comments / Special instructions field. Aayudh Tools will evalutae and revert with our recommendations.
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