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Technical Discussions
ashwani kumar
MIDHANI, Hyderabad, India, Joined Jun 2015, 96

ashwani kumar

MIDHANI, Hyderabad,
Joined Jun 2015
10:50 Jan-18-2017
Making of 0.5mm FBH

Dear sir,

How 0.5 mm FBH can be made/checked with the following tolerances?

Diameter of FBH : 0.5 ± 0.02 mm
Depth of FBH : 5 ± 0.02mm
FBH Alignment :
(a) Perpendicularity w.r.t entry surface of block : within 20 minutes
(b) Location w.r.t logitudinal axis : ± 0.25mm
Driller / Citter ed flatness : 0.03 mm per 3.2 mm diameter
Surface rougness of hole bottom : As smooth as possible
Diameter of blocks : 50 mm ± 0.02mm
End faces flatness : ± 0.005mm max
Ed faces parallelity : ± 0.02 mm max
Overall surface roughness : Ra: 0.5 macron max

The maker or the supplier of this block (Titanium) of this may contact MIDHANI.


ashwani kumar

Phil Herman
Sales, - Manufacture of NDT Reference Standards/Test Blocks
PH Tool Reference Standards, USA, Joined Oct 1999, 79

Phil Herman

Sales, - Manufacture of NDT Reference Standards/Test Blocks
PH Tool Reference Standards,
Joined Oct 1999
14:09 Jan-18-2017
Re: Making of 0.5mm FBH
In Reply to ashwani kumar at 10:50 Jan-18-2017 (Opening).

Dear Ashwani Kumar,
PH Tool Reference Standards in the US specializes in the manufacture of calibration standards containing flat bottom holes, EDM notches, and other artificial defects. The FBH process is one that involves a preliminary hole to be drilled using conical pointed tooling just short of final depth, then the precise conversion of the very same tool to one that is truly flat bottomed, and final removal of the cone at the hole bottom. This method would apply for 50mm diameter blocks per ASTM E428 in Ti that you described, but a similar process using EDM is often employed for inaccessible holes or harder materials. Visual, mechanical, and non-contact measuring system methods are then used to verify the critical features of the hole. Some will attempt to finish the hole bottom using a conventional endmill cutter. This is not an effective way to machine the hole as the included angle at the tool end does not create the bottom flatness required. Careful grinding and inspection of the tool on purpose-built Swiss drill grinding equipment is essential to make the hole bottom properly. Contact sales@phtool.com for more information.
Phil Herman
PH Tool Reference Standards


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