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SFM surface finish modules
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The SFM modules for the SFP2 probe system have been designed to suit the demands of specific parts and features encountered in a precision manufacturing environment.
Each SFM module is its own miniature measuring device, incorporating Renishaw's proprietary encoder system to transduce the motion of the stylus tip.
SFP2 module comparison chart
Application | Diamond tip radius (µm) | Typical surface finish accuracy (of nominal Ra) * | Skid / stylus arrangement | Stylus holder compatibility | Lateral scanning capability | |
General purpose; engine block gasket face. | 2 or 5 | ±(5% + 15 nm) | Side-by-side | SFH-1, SFH-2 | Yes | |
General purpose; engine block gasket face, lateral scanning of crank shaft bearing journals. | 2 or 5 | ±(5% + 15 nm) | Side-by-side | SFH-1, SFH-2 | Yes | |
Scanning close to obstructive faces. | 2 or 5 | ±(5% + 15 nm) | Side-by-side | SFH-1, SFH-2 | Yes | |
Scanning close to obstructive faces; lateral scanning of crankshaft bearing journals. | 2 or 5 | ±(5% + 15 nm) | Side-by-side | SFH-1, SFH-2 | Yes | |
Awkward to reach pockets and groves. | 5 | ±(10% + 20 nm) | Side-by-side | SFH-1, SFH-2 | No | |
Extended reach into confined areas; integrated bladed rotors (IBRs) with small blades. | 5 | ±(10% + 35 nm) | Side-by-side | SFH-1, SFH-2 | No | |
Undercuts and grooves. | 5 | ±(10% + 20 nm) | Side-by-side | SFH-1, SFH-2 | No | |
Automotive engine valve guide ways. | 2 or 5 | ±(10% + 35 nm) | In-line (stylus lagging skid) | SFH-1 only | No | |
Rotors, blisks and blades, especially fillet radii. | 2 or 5 | ±(10% + 20 nm) | In-line (stylus leading the skid) | SFH-1, SFH-2 | No | |
Automatic transmission valve bodies, valve seats, minimum feature access (mm): Ø9 × 52 (max. depth). | 2 or 5 | ±(10% + 20 nm) | Stylus central to two-part skid | SFH-1 only | No | |
Automatic transmission valve bodies, minimum feature access (mm): Ø9 × 122 (max. depth). | 5 | ±(20% + 60 nm) | Stylus central to two-part skid | SFH-1 only | No | |
Straight module for inspection of small groove features (type A skid). | 10 ** | 0.02 - 0.3 *** | Side-by-side | SFH-1, SFH-2 | No | |
Straight module with large radius skid for scanning with large cut-off values. | 2 or 5 | ±(5% + 15 nm) | Side-by-side | SFH-1, SFH-2 | No |
* Accuracy values are dependent upon a number of system variables. These include the machine size and configuration, scan orientation, condition of stylus tip, part fixturing system and environmental noise.
** Stylus tip radius (mm)
*** Feature depth range (mm)