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12
7.5 Blade guide adjustments
Tools required: 5mm, 6mm hex wrenches
19mm open-end wrench
Proper adjustment of blade guide bearings is critical
to efficient operation of the saw. The band saw is
shipped with blade tensioned and blade guides
properly set by the manufacturer, but should be
confirmed by the operator. They will rarely require
adjustment except after a blade change. Failure to
maintain proper blade guide settings may cause
inaccurate cuts and/or blade damage.
First verify that the blade is sharp and in good
condition; properly adjusted guides will not
compensate for an inferior blade. If performance
remains poor after changing a blade, check the
blade guides for proper spacing. For most efficient
operation and maximum accuracy, provide only very
slight clearance between blade and guide bearings.
The bearings will still turn freely with this clearance.
If the clearance is incorrect, the blade may track off
the drive wheel.
Check blade to make sure the
welded joint has been ground to the same
thickness as rest of blade. If blade is thicker at
weld, the guide bearings may be damaged.
7.5.1 Rear support bearing
The rear support bearing (F, Figure 7-3) prevents
deflection of blade under pressure from the
workpiece. Set support bearing so that it nearly
contacts back edge of blade but can still be turned
by hand when blade is not running.
1. Disconnect machine from power source.
2. Loosen two hex socket cap screws (G, Figure
7-3). Note: Left guide has two hex socket cap
screws; right guide has one (HBS-916EVS
only). The HBS-1018EVS has two screws on
each guide.
3. Move guide seat (G
1
) up or down until only
slight clearance between back of blade and rear
support bearing is obtained.
4. Tighten two screws (G).
5. Repeat for other blade guide assembly.
7.5.2 Guide blocks and bearings
6. Loosen screws (J
1
, Figure 7-3) and slide guide
blocks (J
2
) into contact with blade. Tighten
screws.
7. Two ball bearing guide assemblies are used in
each set of blade guides. The inner bearing
guide is fixed; the outer bearing guide (toward
front of machine) is mounted to an eccentric
shaft and is adjustable.
8. On the outer bearing guide, hold the eccentric
sleeve (K
1
) with a 19mm wrench and loosen
center locking screw (K
2
). See Figure 7-3.
9. Position the bearing by turning the sleeve. Set
the bearing in contact with blade then back it off
very slightly so that it will still turn by hand.
10. Tighten center locking screw (K
2
) while holding
the eccentric sleeve in position.
11. Repeat for the other guide assembly.
Figure 7-30: blade guide adjustments (left guide
assembly shown)
7.6 Test cutting to verify adjustment
Test cuts can be used to determine whether or not
you have adjusted the blade accurately. Use 2-inch
round bar stock to perform these test cuts, as
follows:
1. With bar stock securely clamped in the vise,
make a cut through the bar stock (see Figure 7-
4).
2. Mark the top of the bar stock.
3. Move the bar stock about 1/4-inch past the
blade to prepare for a second cut.
4. Rotate the bar stock 180 degrees so that your
mark is now at the bottom of the cut.
5. Make a cut through the bar stock.
6. Use a micrometer to measure the thickness
variation of the disk which has been cut from the
bar stock. Measure at top and bottom of disk.
The saw blade can be considered correctly adjusted
when the variation measure is no more than 0.012
inch across the face of the disk.
If you do not have a piece of 2-inch bar stock
available for a test cut, use a larger diameter test
piece rather than a smaller one. The maximum
thickness variation on any test piece should be no
more than 0.003 inch, per side, per inch of stock
diameter.
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