PrepMill

Recommended for: tube facing, tube bevelling, weld removal

KRAIS Tube Expanders

The PrepMill series pneumatic tube facing, bevelling and weld removal machine. The PrepMill is a rugged, fast, portable weld end preparation lathe for various tubes including stainless steel and other high chromium alloys. Machine is constructed on two opposite set up taper roller bearings that makes the machine extremely stable and very rigid and compact. A standard machine is equipped to cover 25 to 122 mm ID (1” to 4,8”) with a 116 mm cutter head.

Standard working range

APPLICATION RANGE STANDARD LOCKING
25 – 127 mm 25 – 122 mm
1 – 5” 1,0 – 4,8”

Motor parameters

FEED STROKE POWER FREE SPEED TORQUE
25 mm 1” 1,3 Hp 120 Rpm 140 Nm 105 Ft.Lbs
Air use: 55 cfm 1,3 m3/ min Body width: 2,59” 66 mm
Body height: 14,5” 370 mm Body weight: 20,5 Lbs 9,5 kg

Standard set up

KRAIS Tube Expanders

SHAFT25

Self-align, heavy duty locking system. Shafts and jaws are longer and wider to ensure maximum clamping force.

KRAIS Tube Expanders

116 MM (4,56”)

The large cutter head, designed to fasten the wide range of cutting inserts.

Locking ranges

SHAFT: SHAFT25

RANGE [MM] RANGE [INCH] JAWS EXT. SPRING
MIN MAX MIN MAX NR QTY.
25 30 0,984 1,181 NS-1 SP-24 1
30 35 1,181 1,378 NS-2 SP-24 1
35 40 1,378 1,575 NS-3 SP-25 2
40 45 1,575 1,772 NS-4 SP-25 2
45 50 1,772 1,969 NS-5 SP-25 2
50 55 1,969 2,165 NS-6 SP-25 2
55 60 2,165 2,362 NS-7 SP-25 2
60 65 2,362 2,559 NS-8 SP-25 2
62 67 2,441 2,638 NS-5 NS-10 SP-25 2
67 72 2,638 2,835 NS-6 NS-10 SP-25 2
72 77 2,835 3,031 NS-7 NS-10 SP-25 2
77 82 3,031 3,228 NS-8 NS-10 SP-25 2
82 87 3,228 3,425 NS-5 NS-20 SP-25 2
87 92 3,425 3,622 NS-6 NS-20 SP-25 2
92 97 3,622 3,819 NS-7 NS-20 SP-25 2
97 102 3,819 4,016 NS-8 NS-20 SP-25 2
102 107 4,016 4,213 NS-5 NS-30 SP-25 2
107 112 4,213 4,409 NS-6 NS-30 SP-25 2
112 117 4,409 4,606 NS-7 NS-30 SP-25 2
117 122 4,606 4,803 NS-8 NS-30 SP-25 2

Total working range

APPLICATION RANGE STANDARD LOCKING
20 – 127 mm 20 – 122 mm
0,787 – 5” 0,787 – 4,8”

Optional heads

KRAIS Tube Expanders

66 MM (2,59”)

The smallest cutter head, designed to fasten the wide range of cutting inserts.

KRAIS Tube Expanders

88 MM (3,46”)

The popular, medium cutter head, designed to fasten the wide range of cutting inserts.

KRAIS Tube Expanders

PRRBMH

Head for membrane and overlay removal. Efficiently remove material between boiler tubes.

Go to datasheet.

KRAIS Tube Expanders

STWRPM

Head dedicated for strength weld removal. Heads are easy to align and sized per tube diameter.

Go to datasheet.

KRAIS Tube Expanders

OBPM

Head for outside bevelling of tubes and pipes. Available in wide range of diameters and beveling angles.

Go to datasheet.

KRAIS Tube Expanders

TFPM

Tube facing milling head for tubes made of any type of material. Utilizes 6% cobalt inserts.

Go to datasheet.

Optional SHAFT

KRAIS Tube Expanders

SHAFT20

Self-align, heavy duty locking system. Shafts and jaws are longer and wider to ensure maximum clamping force.

Additional accesories

KRAIS Tube Expanders

SPEED REDUCER

Easy to use gearbox for 3x speed reduction. Increases the torque, enabling the machine to generate a thick chip whilst reducing the cutting time.

KRAIS Tube Expanders

SPEED ADJUSTMENT VALVE SAV-500

The solution for all pneumatic drove beveling machines. Allows adjusting cutting speed to suit to the machined tube diameter.

KRAIS Tube Expanders

FAST CLAMPING SYSTEM

System offers rapid tube to tube cycle time, increased productivity (up to 4x) with little operator fatigue. Ideal for large amount of end preps.

KRAIS Tube Expanders

HEAD FLANGE

Adapter to use all MiniMill’s special cutter heads (from size 1-1/2” and up).

KRAIS Tube Expanders

STAR WHEEL

The most precise feed system. Used in many basic and demanding applications.

Example tool application

PrepMill with its 66 mm (2-5/8) width body perfectly fit into limited access areas such as Water wall panels. Easy to clamp and feed with our heavy duty ratchet or star wheel feed.