Model SB1016/SB1036 | O P E R A T I O N | For Machines Mfg. Since 7/09 |
Manual Feed
These three handwheels (see Figure 83) manually position and control the cutting tool for lathe operations.
Cross Slide H
andwheel
Compound Slide
H
andwheel
Carriage
H
andwheel
Figure 83. Carriage handwheels.
Carriage Handwheel
Moves the carriage parallel along the ways, and is equipped with a graduated collar in increments of 0.010" where 360°= 0.990". The handwheel can also be disengaged when power feed operations would make it an entanglement hazard by pushing it in.
Cross Slide Handwheel
Moves the cross slide perpendicular to the ways. For every revolution of the handwheel, the slide moves twice the distance or at a at a 1:2 ratio.
The graduated collar indicates in increments of 0.001"where 360°= 0.200". When turning for example the scale directly reads the resulting workpiece diameter.
Compound Slide Handwheel
Moves the tool in fine increments into the workpiece. The handwheel has an "indirect reading" graduated collar that is broke down in 0.001" increments. When the tool path is perpendicular to the workpiece, the movement that is shown on the scale is only half of what has been removed from the workpiece. For example, if the handwheel is rotated 0.001" the compound slide and tool bit moves 0.001". This results in 0.002: being removed from the workpiece diameter.
Spindle Speed
Using the correct spindle speed is important for safe and satisfactory results, as well as maximizing tool life.
To set the spindle speed for your operation, you will need to: (1) Determine the best spindle speed for the cutting task, and (2) configure the lathe controls to produce the required spindle speed.
Determining Spindle Speed
Many variables affect the optimum spindle speed to use for any given operations, but the two most important are the recommended cutting speed for the workpiece material and the diameter of the workpiece, as noted in the formula shown in
Figure 84:
*Recommended
Cutting Speed (FPM) x 12
= SpindleSpeed (RPM)
Dia. of Cut (in inches) x 3.14
*Double if using carbide cutting tool
Figure 84. Spindle speed formula for lathes.
Cutting speed, typically defined in feet per minute (FPM), is the speed at which the edge of a tool moves across the material surface.
A recommended cutting speed is an ideal speed for cutting a type of material in order to produce the desired finish and optimize tool life.
The books Machinery’s Handbook or Machine Shop Practice, and some internet sites, provide excellent recommendations for which cutting speeds to use when calculating the spindle speed. These sources also provide a wealth of additional information about the variables that affect cutting speed and they are a good educational resource.
Also, there are a large number of
