SP25M cranked stylus carrying capability for typical stylus combinations

As well as straight styli, SP25M has the ability to carry cranked styli when using the standard range of SM25 scanning modules.  For optimum metrology and when larger offsets are required, it is recommended that the SH25-3A, SH25-4A and SH25-5A modules are used.

For SH25-1, SH25-2 and SH25-2A it is mandatory that a 20 mm or longer stylus extension is used between the SH25 stylus holder and the crank centre to give the correct crank down distance from the stylus holder to the crank centre.

When using SH25-3, SH25-4, SH25-3A and SH25-4A, the crank centre may either be mounted directly to the stylus holder or to a stylus extension between the stylus holder and the crank centre.

For SM25-1, SM25-2, SM25-3 and SM25-4, a straight downward pointing stylus can be added to the crank centre to continue the projection down from the stylus holder.  This is providing that the maximum overall stylus length and mass does not exceed the recommended limits for the particular module being used.

For 3D scanning with SM25-1 and SM25-2, the maximum crank out distance is 28 mm and is measured from the cranked (non straight) stylus tip to the centre of the crank centre.  For 3D scanning with SM25-3 and SM25-4, the maximum crank out distance is 58 mm.

Multiple cranked styli may be used providing the overall mass of the crank centre and stylus does not exceed the recommended limits for the particular module being used.

Please refer to the Renishaw stylus catalogue for the full range of cranked and star stylus configurations available.  It is recommended that a one piece star stylus is used whenever possible to minimise the mass of the assembly.  Greater flexibility is offered however by configuring a crank centre with one or more cranked styli.

Module / stylus holder

'Crank down' distance using an extension* between the stylus holder and the crank centre

3D scanning
Maximum 'crank out' distance when measured to tip of crank (star) stylus

2D scanning and point taking
Maximum 'crank out' distance when measured to tip of crank (star) stylus

Maximum 'down' stylus (same as 'effective stylus reach' - see straight styli)

Maximum permissible mass of crank (star) centre plus all styli

Maximum operating stylus tip deflection for above in any orientation

SM25-1 /

SH25-1

25 mm**

28 mm**

58 mm**

50 mm

9 g***

0.4 mm

SM25-1 /

SH25-1

55 mm**

28 mm**

58 mm**

50 mm

9 g****

0.4 mm

SM25-2 /

SH25-2

55 mm

28 mm

83 mm

105 mm

6 g***

0.4 mm

SM25-2 /

SH25-2

85 mm

28 mm

83 mm

105 mm

7 g****

0.4 mm

Module / stylus holder

'Crank down' distance using an extension* between the stylus holder and the crank centre

3D scanning
Maximum 'crank out' distance when measured to tip of crank (star) stylus

2D scanning and point taking
Maximum 'crank out' distance when measured to tip of crank (star) stylus

Maximum 'down' stylus (same as 'effective stylus reach' - see straight styli)

Maximum permissible mass of crank (star) centre plus all styli

Maximum operating stylus tip deflection for above in any orientation

SM25-2A /

SH25-2A

55 mm**

28 mm**

83 mm**

105 mm

6 g***

0.4 mm

SM25-2A /

SH25-2A

85 mm**

28 mm **

83 mm**

105 mm

7 g****

0.4 mm

SM25-3 /

SH25-3

105 mm

58 mm

83 mm

200 mm

13 g

0.4 mm

SM25-3 /

SH25-3

125 mm

58 mm

83 mm

200 mm

12 g***

0.4 mm

SM25-3 /

SH25-3

155 mm

58 mm

83 mm

200 mm

11 g****

0.4 mm

SM25-3A /

SH25-3A

105 mm

58 mm

83 mm

200 mm

12 g

0.4 mm

SM25-3A /

SH25-3A

125 mm

58 mm

83 mm

200 mm

11 g***

0.4 mm

SM25-3A /

SH25-3A

155 mm**

58 mm

83 mm**

200 mm

10 g****

0.4 mm

SM25-4 /

SH25-4

205 mm

58 mm

83 mm

400 mm

11 g

0.4 mm

SM25-4 /

SH25-4

225 mm

58 mm

83 mm

400 mm

10 g***

0.4 mm

Module / stylus holder

'Crank down' distance using an extension* between the stylus holder and the crank centre

3D scanning
Maximum 'crank out' distance when measured to tip of crank (star) stylus

2D scanning and point taking
Maximum 'crank out' distance when measured to tip of crank (star) stylus

Maximum 'down' stylus (same as 'effective stylus reach' - see straight styli)

Maximum permissible mass of crank (star) centre plus all styli

Maximum operating stylus tip deflection for above in any orientation

SM25-4 /

SH25-4

255 mm

58 mm

83 mm

400 mm

8 g****

0.4 mm

SM25-4A /

SH25-4A

205 mm

58 mm

83 mm

400 mm

11 g

0.4 mm

SM25-4A /

SH25-4A

225 mm**

58 mm

83 mm**

400 mm

10 g***

0.4 mm

SM25-4A /

SH25-4A

255 mm

58 mm

83 mm

400 mm

8 g****

0.4 mm

SM25-5 /

SH25-5

35 mm

108 mm

158 mm

100 mm

11 g*****

0.3 mm

SM25-5 /

SH25-5

55 mm

108 mm

108 mm

100 mm

10 g*****

0.3 mm

SM25-5 /

SH25-5

80 mm

108 mm

108 mm

100 mm

11 g*****

0.3 mm

SM25-5 /

SH25-5

100 mm

83 mm

108 mm

100 mm

12 g*****

0.3 mm

* For example, use part number M-5000-3592 (20 mm long × M3 stainless steel extension)

** Representative test results for these configurations is shown in SH25 stylus holder range metrology performance

*** This excludes the mass of the 20 mm extension

**** This excludes the mass of the 50 mm extension

***** This includes the crank down extension mass