15500 - Sewing machine Union Special - Free user manual and instructions
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| Product Type | Industrial Sewing Machine |
| Brand | Union Special |
| Model | 15500 |
| Usage | Heavy-duty sewing for denim, canvas, and leather |
| Dimensions (L x W x H) | 500 x 300 x 400 mm |
| Weight | 30 kg |
| Power Supply | 110-240 V, 50/60 Hz |
| Motor Power | 550 W |
| Max Sewing Speed | 4000 stitches per minute |
| Stitch Type | Lockstitch |
| Needle System | 134x35 |
| Lubrication System | Automatic oiling |
| Presser Foot Lift | Manual knee lift |
| Reverse Sewing | Lever operated |
| Stitch Length Adjustment | Dial with range 1-5 mm |
| Maintenance | Regular cleaning and oiling every 8 hours of use |
| Parts & Repairability | Spare parts widely available; easy to repair |
| Safety Features | Safety clutch and finger guard |
| Included Accessories | Needles, bobbins, oil, tools |
Frequently Asked Questions - 15500 Union Special
How do I thread the Union Special 15500 sewing machine?
Follow the threading diagram on the machine. Pass the thread through the tension discs, take-up lever, and needle eye. Ensure the presser foot is up for proper tension.
What needle size should I use for denim?
Use needles size 16-18 (100/16 to 110/18) for denim. The machine accepts needle system 134x35.
How do I adjust the stitch length?
Turn the stitch length dial located on the front of the machine. Numbers indicate length in mm. Typical setting for denim is 3-4 mm.
Why is my machine skipping stitches?
Skipped stitches can be caused by a bent needle, incorrect needle size, or improper threading. Check needle condition and replace if necessary. Also ensure the thread is properly seated in the tension discs.
How often should I oil the machine?
Oil the machine every 8 hours of sewing time. Use high-quality sewing machine oil. Apply a few drops to the designated oil points indicated in the manual.
Can I sew leather with this machine?
Yes, the Union Special 15500 is designed for heavy materials like leather. Use a leather needle (size 18-22) and reduce stitch length to 2-3 mm.
What is the maximum sewing speed?
The machine can sew up to 4000 stitches per minute. Adjust speed with the foot pedal for control.
How do I clean the machine?
Remove lint and dust from the feed dogs and bobbin area using a soft brush. Avoid compressed air as it can push debris deeper.
Where can I find spare parts?
Spare parts are widely available from industrial sewing machine dealers or online retailers. Common parts include needles, bobbins, tension assemblies, and presser feet.
How do I adjust the presser foot pressure?
Locate the presser foot pressure adjustment screw on top of the machine. Turn clockwise to increase pressure for heavy fabrics, counterclockwise for light fabrics.
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