Singer Sewing Machine Model 15 Manual

The Singer Model 15 is a classic straight-stitch sewing machine, renowned for its durability and reliability. This manual covers the essential information for setup, operation, maintenance, and troubleshooting of your Singer Model 15. Below are key sections covering its features, threading, operation, adjustments, care, and common issues.

Features at a Glance

Key components: Cast-iron body, oscillating hook, front-loading bobbin, tension dial, stitch length regulator, reverse lever, and built-in light.

Unpacking and Setup

Unpack carefully and inspect all parts. Place on a sturdy table or cabinet.

1. Position the machine: Ensure it is stable and level on your work surface.
2. Attach the belt: Connect the motor belt to the handwheel if using an electric motor.
3. Install the needle: Loosen needle clamp screw, insert needle with flat side to the back, tighten screw.
4. Plug in power: Connect the motor plug to a standard 120V outlet. For treadle/hand-crank models, skip this step.

WARNING! Machine is heavy; lift with care using your legs. Ensure the power is off during setup.

First-Time Operation

Before sewing your first stitch, complete these steps.

1. Wind the bobbin: Place thread spool on spool pin, guide thread through bobbin winder tension, and wind bobbin evenly.
2. Insert the bobbin: Drop bobbin into the front-loading bobbin case with thread running counter-clockwise.
3. Thread the upper thread: Follow the numbered threading path on the machine from spool to needle.
4. Set stitch length: Turn the stitch length dial to a medium setting (e.g., 2.5) for general sewing.
5. Test on scrap fabric: Lower the presser foot and turn the handwheel toward you to take a few stitches.

CAUTION! Always turn the handwheel toward you (counter-clockwise) to avoid timing issues. Keep fingers away from the needle.

Specifications

• Model: Singer 15 (various sub-models: 15-91, 15-30, etc.)
• Stitch: Straight stitch, adjustable length.
• Bobbin: Class 15 metal bobbin.
• Needle: 15x1 (HAx1), size 11-18.
• Presser Foot: Low-shank attachment.
• Thread: All-purpose cotton, polyester, or silk thread.
• Max Sewing Speed: Varies with motor; up to 1,100 stitches per minute.
• Dimensions: Approx. 14" long, 7" wide, 12" high.
• Weight: Approx. 30 lbs.
• Power: 120V AC, 60Hz (for electric models) or manual.

Controls and Adjustments

Main controls are located on the right side of the machine.

Stitch Length Regulator: Dial numbered 0 to 4 (or 0 to 30 stitches per inch). Higher number = longer stitch.

Tension Dial: Located on the face. Higher number = tighter tension. Correct tension shows balanced stitches (threads locked in middle of fabric).

Reverse Lever: Push to the left to sew in reverse for back-tacking.

Presser Foot Lever: Raises and lowers the presser foot.

Handwheel: Turn counter-clockwise only to manually advance the needle.

Bobbin Winder: Located on top right. Disengages the needle mechanism when winding a bobbin.

Threading the Machine

Correct threading is essential for proper operation.

1. Upper Thread:
   1. Place thread spool on spool pin.
   2. Pull thread through the first thread guide on top.
   3. Draw thread down and through the tension discs (between the tension dial plates).
   4. Pull thread up and through the take-up lever eye.
   5. Guide thread down through the lower thread guides.
   6. Thread the needle from front to back.
2. Bobbin Thread:
   1. Wind bobbin evenly using the bobbin winder.
   2. Insert bobbin into bobbin case, pulling thread through the slot and under the tension spring.
   3. Hold the end of the upper thread. Turn the handwheel toward you until the needle goes down and up, catching the bobbin thread in a loop.
   4. Pull the loop up to bring the bobbin thread tail through the needle plate.

Tip: Always have both thread tails under the presser foot and toward the back before starting to sew.

Stitch Selection and Use

The Model 15 sews a straight stitch only. Adjust for different fabrics.

1. Stitch Length: Use shorter stitches (1.5-2) for fine fabrics, longer stitches (3-4) for basting or heavy fabrics.
2. Tension Adjustment: Test on a fabric scrap. If top thread loops on bottom, decrease top tension. If bobbin thread loops on top, increase top tension.
3. Reverse Stitching: Hold the reverse lever to the left at the beginning and end of a seam to lock stitches.
4. Seam Guides: Use the lines on the needle plate as guides for seam allowances.

WARNING! Do not force or pull the fabric while sewing; let the feed dogs move it. Always use the correct needle size for your fabric.

Maintenance & Oiling

Regular oiling is crucial for smooth operation and longevity.

1. Frequency: Oil after every 8 hours of use.
2. Oil Type: Use only high-quality sewing machine oil.
3. Points to Oil: Apply one drop to each moving joint, the needle bar, presser foot bar, take-up lever, and bobbin hook race.
4. Cleaning: Remove lint and dust from the bobbin area and feed dogs with a small brush after each project.

CAUTION! Unplug the machine before oiling. Wipe away any excess oil to prevent staining fabric. Never use household oils.

Regulatory Information

This Singer sewing machine complies with applicable safety standards for household use. The Singer name and logo are registered trademarks. For historical reference, many Model 15 machines were manufactured in the early to mid-20th century. For support or parts for vintage models, consult authorized Singer service centers or reputable vintage sewing machine dealers.

Troubleshooting

Note: For persistent mechanical issues, consult a professional sewing machine technician.

Vintage Support: For manuals and parts, search for "Singer Model 15" resources online or contact vintage sewing machine specialists.