Lewis 24-12 - Sewing machine Union Special - Free user manual and instructions
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| Product Type | Industrial Sewing Machine |
| Brand | Union Special |
| Model | Lewis 24-12 |
| Machine Category | Lockstitch, Walking Foot |
| Application | Heavy materials (leather, canvas, vinyl) |
| Stitch Type | Lockstitch (301) |
| Maximum Stitch Length | 9 mm |
| Reverse Feed | Yes |
| Walking Foot Mechanism | Compound feed (needle, presser foot, feed dog) |
| Needle System | 135x17 or 134x35 |
| Needle Size Range | Nm 90 to 230 |
| Bobbin Type | Class 15 |
| Motor Power | 550 W (3/4 hp) |
| Power Supply | 110-220V, 50/60 Hz |
| Speed | Up to 2500 SPM |
| Lubrication | Automatic oil system |
| Dimensions (L x W x H) | 20 x 10 x 18 inches (51 x 25 x 46 cm) |
| Net Weight | 70 lbs (32 kg) |
| Safety Features | Needle guard, belt cover, finger guard |
| Maintenance | Regular oiling, cleaning of lint and dust |
| Spare Parts Availability | Needles, bobbins, presser feet, feed dogs, tension assemblies |
Frequently Asked Questions - Lewis 24-12 Union Special
How do I adjust thread tension on my Union Special Lewis 24-12?
Turn the tension dial on the upper thread tensioner to increase or decrease tension. For bobbin tension, adjust the small screw on the bobbin case. Test on scrap fabric.
What needle size should I use for heavy leather?
For heavy leather (6-8 oz), use a size 180-200 (Nm 180-200) needle. For thicker materials, up to size 230. Ensure the needle point is suitable (e.g., DB x 5 for leather).
Why does my machine skip stitches?
Skipped stitches may be caused by a bent or dull needle, incorrect needle size, timing issues, or insufficient tension. Replace the needle first, then check timing.
How often should I lubricate the machine?
Lubricate with sewing machine oil at the beginning of each workday or after 8 hours of use. Follow the oiling diagram in the manual.
Can I sew light fabrics with this machine?
It is designed for heavy materials. For light fabrics, reduce tension and stitch length, and use a finer needle (e.g., Nm 90). It may still be tricky due to walking foot bulk.
How do I clean the hook assembly?
Remove the needle plate and bobbin case. Use a soft brush to remove lint. Apply a drop of oil to the hook. Avoid compressed air as it may push lint deeper.
What is the correct bobbin winding method?
Place a bobbin on the bobbin winder spindle, thread the thread through the tension disc, push the winder mechanism to engage, and start the machine. Wind evenly.
Why is my needle breaking frequently?
Check if the needle is inserted fully, the needle clamp screw is tight, or the needle strikes the throat plate. Use correct needle type and size for the material.
How do I adjust the feed mechanism?
The feed dog height should be about 1.5 mm above the throat plate. Adjust via the eccentric screw on the feed bar. Stitch length can be adjusted via the stitch length lever.
Where can I find spare parts for the Lewis 24-12?
Parts are available from authorized Union Special dealers or online retailers. Common parts include needles, bobbins, tension springs, and presser feet.
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