Parts and Accessories

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Features

  • Maximum Eccentricity 0.002"
  • Chrome Plated Steel Handwheel
  • Rubber Finger Guard
  • VT Parts Replaceable Insert
  • Hardened to your specification Available Off The Shelf in 58 Rockwell C
  • Tolerance: Specified Dimension -0" + 0.000984"

Available Sizes

  • 30 mm square for the size 22-30 Safety Chuck
  • 40 mm square for the size 30-40 Safety Chuck
  • 50 mm square for the size 40-50 Safety Chuck
  • 50 mm and 80 mm square for the size 50-80 Safety Chuck

Boschert introduces its patented VT-7 replaceable insert design. The roll shaft journal is made of a round part with a square part. The round part accepts the load bearing foot print of the roll shaft. The square part transmits torque through the Safety Chuck to the roll shaft.

The torque of the operation (the square part) is separated from the load bearing foot print of the roll shaft (the round part) preventing wear to the round part of the roll shaft journal.

This is a highly efficient design in providing longer lasting concentricity. Where as other seat (pocket) shapes wear from torque during the operation, this design allows the concentricity between the Safety Chuck and the roll shaft to remain almost as precise as when new - throughout the life of the VT-7 replaceable insert.

You could actually let your operation wear out the square part of the VT-7 seat without seriously affecting the concentricity between the roll shaft journal and the round part of the VT-7 insert!

This means:

  • Longer life between the roll shaft journal changes and replaceable insert changes!
  • More precise quality control to your web during the life of the VT-7 insert.
  • Fewer quality problems associated with high speed runs.

There is only one size VT-7 for each Safety Chuck size. Below are the measurements for the wearing parts of the VT-7 and the design of the shaft end

 
a
b
c
d
e x 30o
Ø f h7
g
Ø h -0,2
i
22 - 30
30 +0.1/+0.3
32.5
14 +0.2/+0.3
8 -0.1
4
30
8 +0.1
26 -0.2
6
30 - 40
40 +0.1/+0.3
37
18 +0.2/+0.3
11 -0.1
5
40
8 +0.1
36 -0.2
6
40 - 50
50 +0.1/+0.3
38
17 +0.2/+0.3
13 -0.1
5
50
8 +0.1
46 -0.5
6
50 - 80
50 +0.2/-0.2
55
23 +0.2/+0.3
17 -0.1
6
50
15 +0.1
45 -0.2
9
 
80 +0.1/+0.3
55
23 +0.2/+0.3
17 -0.1
6
80
15 +0.1
74 -0.2
9
All Sizes Available As STO/FLO (without shaft) or STW/FLW Models (with shaft)
Size Maximum
Weight/Pounds
Maximum
Torque
Ft/Lbs.
Maximum
RPM’S
Available
Square opening
22-30 1760 130 1350 30mm
30-40 3520 250 1350 40mm
40-50 6200 800 1350 50mm
50-80 15400 1700 1100 50mm and 80mm
80-120 26450 7300 900 120mm

Hours of Operation: Monday - Friday 9-5 CST
Call: 800-479-0010

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