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Official Journal of the Japan Wood Research Society

Table 1 A performance comparison between the smart increment borer (Smartborer) and previous devices

From: Smart increment borer: a portable device for automated sampling of tree-ring cores

References

Core diameter (mm)

Total weight (kg)

Gear ratio

Max core length (cm)

Penetration speed (cm/min)

Reaction support

Remarks

This study

5

6.0a

1:24

More than 80

50

Leg and arms of the operator

One battery can sample 5.5 cores of 50 cm length (Cedrus deodara) and 36 cores of 14 cm length (Larix kaempferi)

Hall and Bloomberg [12]

 

11

1:10-1:11

More than 80

n.a.

Arms

There is a risk of wrist injury

Johansen [7]

 

More than 18

1:5

n.a.

98

Arms

Electric drill (4.5 A) is used

This study

12

9.5a

1:24-1:118

More than 80

12-50

Leg and arms

One battery can sample 4.0 cores of 40 cm length (C. deodara) and 26 cores of 14 cm length (L. kaempferi)

Krottenthaler et al. [3]

 

23

None

270

1.5

Support frame

Sawing increment borer is used

Johansen [7] and Downes et al. [5]

 

More than 6

1:20

n.a.

37.5

Arms

Tanaka engine drill is used, but it is “slightly underpowered” [5]

  1. aTotal weight includes that of electric wrench, gearbox, reaction bar, expandable bar and winch socket (a–d and g in Fig. 2)