The Illustrated Engine Turning Reference™

Technical Reference

Conversion Chart for depth of cut settings on various machines

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This chart gives a quick comparison of various depth settings with the jewellers metal gauge (Shakespeare) and metric and imperial with sliderests in use at Pledge & Aldworth workshops.

N.B. These figures are to the nearest whole thousandth of an inch. Plant figures marked "A" are exact.

Plant micro Güdel /10 Shakespear
Thou mm 36tpi /10 2BA /10 P=.75mm (BMG)
1
2
3 1 1    
4 0.1
5
6 2 2 10
7
8 0.2 3
9 1
10 3 2
11 4 3
12 0.3 20 4
13 4
14 5 A 5
15
16 0.4 5 6
17 6
18 30
19 7 6 7
20 0.5
21
22 8 7 8
23
24 0.6 40 9
25 9
26 8
27
28 0.7 10 A 10
29 9
30 50
31 11
32 0.8 10 11
33 12
34
35 11 12
36 0.9 13 60
37
38 12 13
39 14
40 1
41 13
42 15 A 70
43 14
44 1.1 16
45 14
46
47 1.2 17 80
48 15 15
49
50 18
51 1.3 16 16
52
53 19 90

For users of different makes of engine turning machines:

If you send us your guide and depth stop screw thread pitches and the number of divisions on the micrometer, along with the name of the makers of your sliderest, we will add it to this table.