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We at The Custom Crafter thank you for your order. 

These instructions are to help you install our Servo Motor Mod on your Smithy Granite 1324. We hope you find that this upgrade greatly improves the performance and reliability of your machine as many other Smithy owners have.

These instructions are broken down in five sections:

  1. Inventory of the system in our package.

  2. Removal of the Smithy electrical system, case and motor mount.

  3. Installation of the new mechanical components.

  4. Installation of the new electrical components.

  5. Basic operation.

 Inventory of the system in our package.

  1. A 2 horsepower servo motor complete with custom machined double sheave pulley installed.

  2. A standalone custom built servo motor controller with overload protection.

  3. A speed control module that plugs into the motor controller with a 4 pin connector.

  4. A welded steel motor mount designed to fit onto the Smithy Granite. 

  5. The specialty bolts (3 +1) required to attach the motor to the new motor mount.

  6. The specialty bolts (4) required to attach the new motor mount to the Smithy.

Not included:
Belts are often different on each machine. the below belts are suggestions only.

  1. Single speed: 15395 V-Belt 1/2" wide 40.07" long.
    Note: Maybe substitute 7405XL if 15395 is out of stock

  2. Two speed lower: 15280 V-Belt 15/32" wide X 28.57" Long

  3. Two speed upper: 4L280 V-Belt 1/2" wide 28" long.

These 3 V-belts allow you to install the system with either the high or low speed operation.

Optional belts are:
7405XL {41.07” long} (replaces 15395 above). This belt fits 40% of all machines and seams to be better for the 1 speed.
AL37 {37” long} (replaces 15395 above). This belt not included fits very few machines better.

Clean and lubricate each of the components as you go through the below steps. Please take extra care to keep grease off of the V-belts.

Removal of the old components:


  1. Open the pulley case door by twisting the knob and pulling the door. Then lift the door
    off the hinges and set aside. 

  2. Loosen the set screw on the speed control knob with a small flat tip screwdriver
    and remove the knob.


  3. Remove the ½” nut on the speed control potentiometer, then push the shaft into the case.


  4. Remove the two phillips screws on the switch panel and pull it out of the case.


  5. Disconnect all the ¼” blade connectors from the back of the switch panel with a small flat
    tip screwdriver.
    (You may want to number all of the connectors with a Sharpie in case you ever decide to

    reuse the cable).


  6.  Two wires riveted to the switch panel must be cut with wire cutters.
    Then, remove the white plastic insulator box.


  7. Remove the three screws that hold the
    interior electrical panel to the case.


  8. Remove the two screws that hold the small bracket (at the bottom of the case)
    and remove it to release the power cords.


  9. Lift and pull the electrical panel out of the case.


  10. Cut the two cable ties that hold the wires in a bundle.


  11. Cut the connectors off of the power and motor cords so that they will slip through
    the small case holes.


  12. Push the power cords into the hole at the bottom of the case.


  13. Go to the back of the machine and find the 2 cords. One goes to the motor and the
    other one has an electrical plug. Loosen the black plastic strain relief screws.


  14. Slowly pull these cords out of the case.


  15. If the old motor is still attached, loosen the pulley tension lever and remove the belt
    from the motor pulley.


  16. Unscrew the 4 mounting bolts and remove the motor.

    This Section lines 17 through 24 is is for Smithy’s with the optional low speed pulley.

    We recommend single speed installers review this section as these instructions were written with a 2 speed.
    Very limited information is found in the next section to address a 1 speed/single belt install.

  17. Remove the ⅝” bolt from the center of the case and remove the center pulley bracket
    with the pulley. The pulley will drop (watch your fingers)!


  18. Remove the locking screw from the selector arm.

  19. Pull the selector knob as far out as possible, penetrating oil may be needed.


  20. Remove the five remaining case screws.


  21. Lift the case up and to the right and remove the selector guide from the selector lever.


  22. With the selector guide out of the way, the belt(s) can be removed.


  23. Remove the case from the main chassis.
    (This was done by Paul. However, I do not believe it is necessary).


  24. Remove the case from the main chassis.


  25. Using a liberal application of penetrating oil, remove the motor pivot pin set screw.


  26. Using much MORE penetrating oil, persuade the pivot pin to slide out of the frame.
    This releases the motor mount. Paul's Note: Needle nose vice grips and a hammer
    are very useful here. I think it depends on the how corroded it was.


  27. This completes the disassembly and gives you an excellent opportunity to clean all
    the places  you could never access before. It is also a good idea to clean the grease
    off the gears near the pulleys so the belts can be fitted clean.

Installation of the mechanical components.

  1. Use the 4 larger screws to attach the new motor mount to the Smithy motor mount.
    This is for setup, just snug the screws.


  2. Note the sliding inserts in the new motor. Slide the new motor into the motor mount
    so the inserts line up with the screw holes and insert the three screws that can be fitted.
    We will deal with the fourth screw later. Tighten the screws just snug.


  3. Place a small block of wood under the motor position behind Smithy frame and set the
    assembly on it.


  4. Balance the motor on the wood block while aligning the holes for the pivot pin and
    slide the pin in. DO NOT push it all the way in! You will need to remove it.


  5. Swing the top adjuster bracket into place and reinstall the nut.


  6. Time to align the pulleys.
    A. If you are installing a single belt continue at step 7.
    B. If you are installing a dual belt, continue at step 12.


  7. Place the15395 V-belt on the pulleys.
    The 15395 is 40.07” long
    The 7405XL is 41.07” Long.
    The original on this lathe measured 41.25”


  8. Check the alignment with a straight edge.


  9. Adjust the motor forward and rearward to align the pulleys,
    then mark the motor position with a sharp blade. 
    Because the mount bolts are hard to access:
    This done so you can remove the motor and tighten motor mount 
    bracket in the correct position, than reinstal motor. Because the mount 
    bolts are hard to access.


  10. Remove motor assembly from the Smithy by removing the V-belt,
    adjustment nut and the pivot pin. Resume instructions at step 19.


  11. Dual belt setup.
    Install the center pulley back onto the Smithy. Use the 15280 belt on the lower pulleys and the 4L280 belt on the upper pulleys. (Note: these belts fit perfectly and do not require cutting the case for extra clearance.) Check the alignment.

  12. As you can see in the pictures, on this machine, the center pulley does not line up with
    the lower or the upper pulleys. I am not sure why or who worked on it before, To fix
    it required a spacer to move it forward. Try to find a washer of the correct thickness.


  13. When the case is reinstalled, it will add 0.080”
    to the spacer thickness. Consider this when
    selecting your spacer.

    Note: Short version instructions do not remove 
    the belt case or address this issue as this
    is the only machine so far to have this issue.


  14. Before this assembly can be reinstalled, the front bracket must be moved forward
    by loosening this set screw.


  15. Insert the pulley with the spacer and reinstall the large bolt


  16. These belts fit well and do not require the case to be cut for pulley clearance.


  17. Slide the motor forward and rearward to align the lower pulleys. When you have achieved
    good pulley alignment, mark the motor with a sharp tool.


  18. The fourth motor mount screw will be under the Smithy original motor mount.
    Measure the distance and mark the spot.
    On this machine it is very near the edge.


  19. Remove motor assembly from the Smithy by removing the belts, the motor adjustment
    nut and the pivot pin. Remove all the screws from the motor mounts


  20. It is only necessary to provide space for an Allen wrench to reach through the bracket to
    tighten the screw. The large countersunk screw does not have to go through the hole.


  21. On this install, the screw is near the edge of the bracket, so a chop saw is used to cut a
    small slot in it. If yours is closer to the middle, you may drill a hole instead, ------------------------------------->


  22. Insert the countersunk screw into the appropriate hole and reinstall the new motor mount
    to the Smithy mount with the four large screws using Loctite.


  23. Place the motor onto the mount aligning the holes in the sliding brackets with the holes in
    the mount. Align the motor with your mark, then insert and tighten the 4 screws.
    Locktite is a consideration.


  24. Place the Pulley case back onto the Smithy chassis. Lift the right side and slide the
    4L280 V-belt (dual belt) or the 15395 V-belt (single belt) over the upper pulley.


  25. Insert the motor assembly with the pulley through the hole.


  26. Balancing the motor assembly on the wooden block again, slide the pivot pin into its hole
    and through the motor mount. Installing the set screw is optional.


  27. Swing the top adjuster bracket into place and reinstall the nut.

  28. Adjust the motor as close to the chassis as possible.

  29. If you have the dual belt option, wrap the 15280 V-Belt around the lower pulleys and the 
    4L280 V-belt around the upper pulleys.
    If you have the single belt, wrap the 15395 V-belt around the upper and lower pulleys. 


  30. Lift the pulley case and slide the selector guide back into place. Push the collar to the top
    and align the hole with the small indent in the shaft and reinstall the set screw.


  31. If you have the center pulley option, it is time to install it. Slide the pulley bracket, front
    spacer and optional rear spacer up and behind the front bracket. A wooden block is
    helpful here. Slide the big bolt through the multiple holes and screw it into the frame,
    but not tight. Then, install the case screws.


  32. Before final tightening, the front bracket must be pushed up until the gears mesh tightly.
    Then, tighten the ⅝” bolt and front bracket set screw.


  33. Test the belt tensioner and adjust it to tighten and loosen correctly. New belts may need
    to run for a while to stretch and release correctly. 

    This page still under construction. Feel free to contact us with sugestions.
    Thank you.

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