MiniShaft

How To Proper Lock

For: MiniMill 101, MiniMill 200, MiniMill 300LP and Auto MiniMill with MiniShaft.
In order to obtain the best possible centering of the MiniMill into the faced, bevel or weld removal tube, we recommend to select the shaft with diameter closest possible to the inner diameter of tube.

MiniShafts Shafts Numbers

Tube OD: 3/4 inch

TUBE GAUGE SHAFT NUMBER SIZE [INCH] SIZE [MM] SPRING
11 901 MM#151 1 240 0 492 DW-11
11 911 MM#151 1 260 0 496 DW-11
12 912 MM#151 1 320 0 519 DW-11
13 905 MM#151 1 390 0 547 DW-12,5
14 914 MM#151 1 450 0 570 DW-12,5
15 9151 MM#151 1 510 0 594 DW-12,5
16 916 MM#151 1 550 0 610 DW-12,5
17 917 MM#151 1 580 0 622 DW-12,5
18 918 MM#151 1 630 0 641 DW-15,5
20 909 MM#151 1 680 0 661 DW-15,5

Tube OD: 7/8 inch

TUBE GAUGE SHAFT NUMBER SIZE [INCH] SIZE [MM] SPRING
10 9151 MM#151 1 510 0 594 DW-12,5
11 917 MM#151 1 570 0 622 DW-12,5
12 922 MM#151 1 640 0 645 DW-15,5
13 923 MM#151 1 710 0 673 DW-15,5
14 924 MM#151 1 770 0 696 DW-15,5
15 925 MM#151 1 830 0 700 DW-15,5

Tube OD: 7/8 inch

TUBE GAUGE SHAFT NUMBER SIZE [INCH] SIZE [MM] SPRING
16 926 MM#151 1 860 0 732 DW-15,5
18 928 MM#151 1 950 0 767 DW-15,5

Tube OD: 1 inch

TUBE GAUGE SHAFT NUMBER SIZE [INCH] SIZE [MM] SPRING
8 909 MM#151 1 680 0 661 DW-15,5
9 938 MM#151 1 750 0 688 DW-15,5
10 925 MM#151 1 830 0 700 DW-15,5
11 931 MM#151 1 900 0 748 O-16
12 932 MM#151 1 960 0 771 O-16
13 915 MM#151 2 000 0 787 O-17
14 934 MM#151 2 090 0 822 O-17
16 936 MM#151 2 180 0 858 O-17
18 938 MM#151 2 260 0 889 O-7

If the shaft is too thin it is exposed to large probability that the MiniMill will be installed non parallel to the axis of the tube. As well as the jaws may not fully grip the tube with its full face but with the corners only, and will result a non-square face of the tube to the tube sheet as well as there is a big probability that it may result the breaking of guide shaft as the machine might be forced into strong vibration what may created a sudden collision with tube or tube sheet. We strongly recommend to look on this, specially for tubes ¾” O.D.

We do offer non-standard size and non-standard shaped jaws upon receiving a drawing of the tube expansion details. As standard the machine is equipped with 3 shafts with numbers 901, 905 and 909MM#151.

Important note!
The guide shafts in the chart are selected for non-expanded tubes. If the tubes are expanded, a different, bigger diameter shaft has to be considered. As well as the contact length of the locking jaws has to be shorter than the length of the effective expansion length . It is unacceptable if the jaws are longer than the expansion and lock only partially on non-expanded part of tube. In that circumstances the locking jaws must be shaped to be able to lock only on the expanded part of the tube.

KRAIS Tube Expanders