Lincoln DC rewound armatures.
- Larry Gruner
- Oct 7
- 2 min read
Updated: Oct 22
Lincoln Electric has obsoleted all its DC exciter armatures. They have been manufacturing these armatures since the 1930s. If you have an SA200 or any machine that has a DC armature, you have a problem. The people who used to rewind these are fast disappearing. It is a time-consuming process that must be done manually.
This is a short list of the steps we take to rewind the armature. Please note that all the steps are done “by hand”; we have no automated machines, except for the winding isolation rotating fixture. This armature has been manufactured since the late 1930s; it is a lost art.
1. The armature core is inspected for damage.
2. The original wires are removed and separated from the commutator.
3. The core is baked in an oven overnight at 600°F. This removes the original varnish.
4. The original wires are removed, and their diameter is checked against the new windings to be reinstalled.
The core is sandblasted, inspected, and then clear-coated with insulation.
Insulating strips are cut and installed in the slots. This adds an extra layer of insulation.
New windings are wound by hand and installed in the slots.
8. New holding wedges are installed to hold the windings in place.
9. Wires are soldered.
10. The commutator is machined to make sure the brushes have perfectly flat contact.
11. Rotor is dipped in high temperature insulation and is submerged in a slowly rotating fixture, to assure through penetration of the liquid insulation.
12. Baked to solidify the insulation.
13. Steps 11 and 12 are repeated.
14. The unit is tested for insulation integrity.
Unit receives a final coat of red epoxy.
The Weldmart rewound Lincoln-style DC armature for SA series machines is far superior to the original: Lincoln armatures.
Has 10-year across-the-counter warranty. We will need your core.
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