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Sherline Products 8100 Manual

Mill digital readout
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SHERLINE Mill Digital Readout
P/N 8100 (Inch)
Digital Readouts in the modern machine shop
Digital readouts are popular on full-size shop mills because they make the life of a machinist
much simpler. They make it easier to accurately set or change the table position and eliminate
errors caused by misreading handwheel increments or losing track of multiple rotations. Now
that same convenience is available on tabletop size machines with the availability of a D.R.O.
(Digital ReadOut) for Sherline mills. The kit can be installed on any Sherline mill, regardless of
age. Two-axis kits will also soon be available for Sherline lathes. The compact electronics
package and clever backlash compensation feature were designed by John Wettroth.
On expensive industrial DRO's, a sensor reads a highly accurate external scale. On Sherline's
DRO, the sensor reads rotation of the leadscrew. Because of the accuracy of Sherline's precision
rolled leadscrew threads and the short travels on a machine of this size, this system makes it
possible to provide a DRO with sufficient accuracy while maintaining a price appropriate for a
machine of this size and cost.

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Summary of Contents for Sherline Products 8100

  • Page 1 SHERLINE Mill Digital Readout P/N 8100 (Inch) Digital Readouts in the modern machine shop Digital readouts are popular on full-size shop mills because they make the life of a machinist much simpler. They make it easier to accurately set or change the table position and eliminate errors caused by misreading handwheel increments or losing track of multiple rotations.
  • Page 2 The Sherline unit is very easy to use. Remember that the directions of movement of the mill are referred to as the X-axis (table side-to-side), Y-axis (table in and out) and Z-axis (spindle up and down). The readout of any axis can be set to zero at any time with the push of a button. From there as you move the handwheels you can read the table position to three decimal places on the digital readout.
  • Page 3 FIGURE 1-Installing the new thrust collar and existing washer on the X- and Y-axes FIGURE 2-Makng sure the leadscrew is centered 7. Install a new handwheel and encoder ring on the X- and Y-axes. The encoder ring has been factory installed on the handwheel for easier assembly. Note that the X and Y handwheels are similar except on the X-axis, the numbers on the handwheel face away from the handwheel.
  • Page 4 x 3/8" self-tapping screws. Draw the screws down until they seat snugly, but DO NOT OVER-TIGHTEN or you can strip the threads! Once tightened into position, the unit can be rotated around until the screws and cable are on the bottom. When finished, the cable from the X-axis encoder should come off to the rear, and the cable from the Y-axis encoder should come off to the right.
  • Page 5 8. Using a 1/8" hex wrench, remove the flat head screw that holds the Z-axis thrust collar to the column. Remove the collar by lifting it up and off the Z-axis leadscrew. If the spacer washer sticks to the bottom of it, remove it and reinstall it on the leadscrew shaft. Then remove the ball bearing thrust and two washers from the collar and reinstall them in the new Z-axis thrust collar in the same order.
  • Page 6 FIGURE 7-Mounting the sensor to the belt housing NOTE: If you have a mill with an older AC/DC motor that does not have a plastic belt guard, the RPM sensor can be mounted in the proper position over the pulley by attaching it to the motor mounting bracket.
  • Page 7 2. INCH-Hold down both the "Power" button and the "X" axis button while you plug the power cord back into the display unit. After the display comes up, release the buttons. The display should now read in inch dimensions. 3. METRIC-To initialize your display unit to read metric dimensions, hold down the "Power"...
  • Page 8 To adjust tension on the screw, first remove all Z-axis backlash in the conventional manner by lifting the motor/speed control unit by hand while tightening the handwheel set screw on a "fresh" quadrant of the leadscrew to avoid picking up any previous indentations. Once adjusted, tighten the new center screw only until it is "finger tight".
  • Page 9 Encoder housing seen from outside with cap removed. Wires are shown in order as they come from the factory. (Click on diagram to view a larger version.) NOTE: The wires and solder joints are small and delicate. If you don't have a suitable soldering iron and a little expertise along these lines you may return your encoder housing to the factory and we will make the change for you at no charge.
  • Page 10 handwheel and interpolating your position, you can achieve a high degree of accuracy. Knowing your machine is an important part of achieving this kind of accuracy, and as you get more familiar with your machine, your accuracy will continue to improve. Sherline's DRO brings modern machine shop technology down to tabletop size and makes your Sherline tools easier and more fun to use.

  • Page 11: Parts Listing

    PARTS LISTING DESCRIPTION 81010 Digital readout box and electronics (complete) 81100 Encoder housing w/ encoder wheel and cable 81110 Upper encoder housing cap 81300 X-axis and Y-axis thrust collars 81310 Encoder gear only (comes pressed onto handwheel) 81350 Z-axis thrust collar 81320 2"...