vb.net barcode reader STEPS FOR MODIFYING A FUTABA S-148 SERVO in Software

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STEPS FOR MODIFYING A FUTABA S-148 SERVO
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The Futaba S-148 is among the most common servos used for hobby robotics. The S-148 uses a brass bushing on its output gear. See the previous section, Basic Modification Instructions, for the generic steps for disassembling the servo.
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1. Note the arrangement of all the gears, then remove them and set them aside. Try not to
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handle the gears too much, as this will remove the grease that was applied to the gears at the factory.
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Solder here
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2.2K resistors
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Solder here Connections from removed pot FIGURE 20.9 To modify a servo you must replace the internal potentiometer with two 2.7K resistors, wired as shown here.
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310 WORKING WITH SERVO MOTORS
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FIGURE 20.10 For greater control and accuracy, use an external 5K or 10K pot to replace the one removed from the servo. 2. Locate and remove the two screws near the motor shaft. With these two screws removed
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you can separate the top of the case from the drive motor.
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3. Press down on the metal output shaft (it is actually the shaft of the potentiometer) to
remove the circuit board. You may need to work the circuit board loose by using a small screwdriver to pry it out by its four corners. 4. Snip the potentiometer off near where the leads connect to the circuit board. 5. If using fixed resistors, solder them in place as shown in Fig. 20.9. If using a 5K potentiometer, follow the additional steps provided in Basic Modifications Instructions, earlier in the chapter. 6. Clip off the nub on the bottom of the output gear, as described in Basic Modifications Instructions. You may now reassemble the servo:
1. Insert the circuit board back into the top casing. 2. Attach the two small screws that secure the top casing to the motor. 3. Reassemble the gears in the proper sequence. The output gear will fit snugly over the
brass bushing.
4. Reassemble the bottom casing, with screws.
The S-148 is representative of servos that are constructed with metal bushings or ball bearings for the output shaft. With minor variations, you can use these steps with other servos of similar design. For example, with only minor variations the same steps
MODIFYING A SERVO FOR CONTINUOUS ROTATION
apply to the Hitec HS-422, another popular servo. Like the S-148, the Hitec HS-422 uses a brass bushing to support the output gear. The major difference between the S148 and HS-422 is that the HS-422 lacks the two screws holding the top casing to the motor. If you are modifying a servo with metal gears, you will not be able to easily clip off the mechanical stop that is located on the bottom of the output gear. For these you will need to use a file or small rotary grinder to remove the stop. You can use a Dremel or other motorized hobby tool to make short work of this task.
STEPS FOR MODIFYING A HITEC HS-300 SERVO
The HS-300 is an economical alternative to the S-148 and other servos with brass bushings or ball bearings. The output gear of the HS-300 is mounted directly to the potentiometer, and no bushing or bearing is used. This means that if you remove the potentiometer, you also remove the structure on which the output gear is attached. Therefore, the steps for modifying an HS-300 are different than those for the S-148. See Basic Modification Instructions, earlier in the chapter for the generic steps to disassemble the servo.
1. Remove the center gear and the output gear. All the other gears can remain. If needed,
2. 3. 4. 5.
place a small piece of electrical tape on the gears to hold them in place while you work (don t get any grease on the tape or it won t stick!). Remove the control board from the bottom of the case. Clip off the three wires leading to the potentiometer. With a small flat-head screwdriver, pry off the three fingers holding the bottom of the potentiometer to its casing. Discard this part. Using a small pair of needle-noise pliers, remove the small disc inside the potentiometer. Take care not to pull the shaft of the potentiometer out. It should remain held in place by a small retainer. Discard this part once it has been removed. If using fixed resistors, solder them in place as shown in Fig. 20.9. If using a 5K potentiometer, follow the additional steps provided in Basic Modifications Instructions, earlier in the chapter. Clip off the nub on the bottom of the output gear, as described in Basic Modifications Instructions.
An alternative to steps 4 and 5 is to ream or drill out the underside of the output gear so that it rotates freely around the potentiometer shaft. Be sure not to ream or drill out too much or you ll ruin the gear. At the same time, be sure you remove enough material so that the gear rotates freely, without any binding. You will still want to clip off the leads of the potentiometer so that it is no longer in circuit with the control board.
You may now reassemble the servo:
1. Insert the circuit board back into the top casing. 2. Replace the output gear onto the shaft of the modified potentiometer. Replace the cen-
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