BT Owners Manual

7/31/2019 BT Owners Manual

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Shooting Star Technology

BT-2

BT-3

Users ManualContents.

Components

Section 1 Mounting ScalesMounting Considerations

Mounting ExamplesShortening a RackEncoder Head Diagram

Mounting

Section 2 Basic FunctionsMemory

Clearing an Axis 1Clearing an Axis 2Pre-setting an Axis

Centering, Diameter, Inch/MMINC/ABS Mode

Feed Display, Tool NumberTool Offsets

Section 3 Menu Functions

Bolt CircleBolt Line

Enter Preset (memory point)

Go to PresetOffsetsAxis Reverse (reversing count direction)

Warranty


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Section One

Mounting Considerations

1. Make sure that the rack is parallel with the ways. The holes in therack supports are deliberately oversize to allow for some adjustment

after the holes are drilled and tapped in the machine.

2. Remember that the spacers for each end of the rack may not be the

same length due to variations in the lathe or mill casting.

3. The encoder head must be able to move without binding. Binding

will cause premature wear and will appear as backlash in measuring.

4. Dont remove the rack support which is pinned onto the rack.

5. Make sure the rack is not rotated with respect to the encoder.

6. Install the rack so that the slit in the plastic cover is downward.

7. Install the rack and encoder so that coolant doesnt pour directly on it.

8. We suggest the user install his own mechanical cover over the rackassembly to protect it from dropped vises, chucks, etc.

9. Be sure to use 10-24 screws to mount the display case. ( supplied)

10.Note that the spacers can be shortened by the user to an appropriatelength for mounting the rack.


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Section One

Shortening a Rack

1. Measure carefully the amount to cut. Measure it again! Plan to cut theend of the rack which is not pinned to the rack support. Note that the

rack fits inside the rack supports, but not so far as to block the mounting

screw hole. Be careful not to rotate the encoder on the rack.

2. Peel back the cover. Slip off the rack support.

3. Cut the rack with a hack saw. Be careful not to mar the rack. Snip offthe cover an equal amount.

4. The cover should be a little short of the rack support. Stretch the cover

over the rack supports so the ridges on the rack support engage thegrooves on the cover. Secure with a plastic tie.


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Section One

Encoder Head Dimensions


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Section One

Encoder Head Mounting

It is important to eliminate binding between the rack and the bushing on theencoder head. This is complicated by the fact that due to manufacturing

process tolerances, the bore in the bushing is not necessarily perfectly

parallel in any plane to the mounting surfaces on the encoder head. Wesuggest that the rack be mounted first. Then mount the encoder head. As

the screws are tightened on the encoder head, watch for deflection of the

rack as shown with a dial test indicator. If it deflects more than 0.005 inch,

this indicates the presence of a bind between the bushing and the rack. Theencoder head position must be adjusted accordingly. Usually judicious use

of shim stock is all thats required to correct for the slight misalignment.

At the factory, the jig used to drill and ream the rack hole keys on the two

mounting screw holes, not the sides of the brass bushing. Also, one hole isoffset 0.050 inch, so the whole thing looks out to the eye, but its the bore

that is important.


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Section 2

Memory

When you turn off the BT readout, all the current settings are saved. This means all the

tool offsets, all the preset memory points, all INC/ABS information, and which toolnumber you were using are all saved. Also, the positions of each axis are saved as well.

The memory retention time is rated at greater than 40 years !

The BT readout cannot, however, keep track of the axis positions if they are movedwhile the readout is turned off. It is up to you, the operator, to decide if you trust the

janitor to not to bump your lathe or mill at night when the readout is turned off. For a

one-person shop, this is not a problem, of course.

For a really short power interruption, the BT has a built-in power-up delay of about oneto two seconds.


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Warranty

Shooting Star Technology warrants that this product is free from defectivematerial and workmanship. If this product fails to operate properly within

the warranty period of FIVE YEARS and the failure is due to improper

workmanship or defective material, Shooting Star Technology will , at our

option, repair or replace the product. All warranty repairs must beperformed by Shooting Star Technology, or be authorized by us.

We also offer a 60 day money-back satisfaction guarantee.

Only the original purchaser of this unit is covered under the warranty.

Date post:	05-Apr-2018
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BT Owners Manual

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