Singer 115
The Singer Model 115, in production from 1912 to 1923, features a rotary hook mechanism derived from the Singer 9W7 and preceding Wheeler & Wilson D9. Its exterior closely resembles that of the Singer Model 15-30. The serial number for this particular machine dates back to June 26, 1913. It’s important to mention that while the vintage hand crank showcased with this example adds charm, it’s not original to this machine.
Alternative bobbin case options
The bobbin case accompanying this machine upon its arrival at my shop bore the marking “PAT U.S.A. AP7-96”; no other identifying marks were discovered. It’s worth noting that this machine is compatible with type “L” bobbins.
The pig tail bobbin case shown here is an aftermarket solution inspired by the Singer 20U design.
Additionally, this machine supports the use of the Singer 20U light industrial zig-zag bobbin case as a replacement. The specific model I experimented with was identified as part number BC-DBZ(3)-NBL6, and it worked without requiring any adjustments.
It’s crucial to conduct thorough testing when considering such substitutions to ensure optimal functionality. While there are accounts of individuals employing 20U bobbin cases in their Singer 115 machines, it’s often necessary to make minor modifications. In my case, perhaps fortune favored me.
Before and after gallery
It’s quite challenging to discern from the exterior alone, but I performed a basic cleaning on the machine. However, due to time constraints, I opted not to remove the connecting rod or the vertical drive fork, and I left the bottom end in place while cleaning on this occasion.
Lacking adjustment guides found on later machines
If you’ve ever tinkered with post-war cast iron Singers, you’ll notice they were designed with careful consideration for easy assembly. However, this was likely more about streamlining manufacturing processes than aiding DIY repairs. Crafted in 1913, this particular machine lacks many of these assembly conveniences.
Unlike its successors, it lacks features like a flat on the needle bar for precise alignment or timing marks for easy needle timing. Unlike later models, the hook shaft on this machine isn’t factory pinned, meaning proper timing isn’t inherently assured unless everything is in pristine condition.
It’s not that this machine is beyond servicing, but it might not be the ideal starting point for your first sewing machine repair endeavor.
Related Article
How to tell the difference between a Singer 15-30 and Singer 115
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Specifications
| Brand | Singer |
| Model | 115 |
| Hook Type | Rotary |
| Bobbin | L |
| Needle System | 15×1 |
| Foot Type | Low Shank |
| Construction | All Metal |
| Construction Drivetrain | All Metal |
