Page 52 BB4500-BB5000 Operating Manual
10. Check that the feed direction and rate are correctly set.
11. Check that all preventive maintenance has been completed.
4.2 TOOL BIT SELECTION
Bar rotation speed is adjustable depending on the power option chosen (electric,
hydraulic, pneumatic). The cutting speed is primarily determined by the hardness
of the metal being machined and the type of tool bit used. Other factors include the
power source, feed and depth of cut, and cooling medium being used.
Generally, carbide cutting tools operate at a higher RPM than high-speed steel
(HSS) tools.
If using a HSS tool bit, set the speed shift lever to LOW. Chips should be the color
of the base material or no darker than a light straw in color.
When using carbide tool bits, set the speed shift lever to HIGH. These chips should
be dark brown to blue.
4.3 OPERATION
4.3.1 Starting the machine
Check that the tool bit is installed so that, as the boring bar rotates, it presents its
cutting edge to the workpiece. Before machining, lubricate the bore and tool bit
with cutting oil.
4.3.1.1 Hydraulic drive
Do the following to start the hydraulic drive:
1. Turn the HPU to its minimum flow rate (lowest speed).
2. Jog the HPU to verify direction of bar rotation. Do the following to reverse
bar rotation:
a) Turn off the HPU.
b) Reverse the hydraulic hoses.
3. With power switched on, adjust the bar speed by turning the hydraulic
speed control knob (located on the control pendant) for one of the follow-
ing results:
• Counter-clockwise to decrease RPM.
• Clockwise to increase RPM.
4.3.1.2 Electrical drive
Do the following to start the electrical drive:
1. Set the rotation speed on the speed control to minimum.
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