The Lyman Mag 25 Digital Melting Furnace is a specialized device designed for melting lead and casting lead objects, primarily for bullet casting. It features a bottom pour system for efficient and controlled dispensing of molten lead.
Function Description:
The primary function of the Mag 25 furnace is to melt lead and maintain it at a precise casting temperature, allowing users to pour molten lead into molds for bullet production. The furnace is equipped with a multi-function digital temperature controller that displays both the actual temperature of the lead (PV - Process Value) and the set target temperature (SV - Set Value). This digital control ensures consistent and repeatable casting temperatures, which is crucial for producing high-quality, wrinkle-free bullets. The bottom pour system, consisting of a drain spout, shut-off rod, and limit screw, allows for controlled flow of molten lead directly into molds. A warming shelf is integrated into the design to pre-heat mold blocks, reducing casting time and improving bullet quality.
Important Technical Specifications:
- Capacity: Up to 25 pounds of cold bullet metal.
- Temperature Control: Digital temperature controller with two displays (PV for actual temperature, SV for set temperature).
- Temperature Range: Factory set for a maximum of 850 degrees F. Temperature can be adjusted in 10-degree increments.
- Power Requirements: Available in 115 Volt, 230 Volt (Euro), and 230 Volt (Australian) configurations, requiring an additional 7 amp draw.
- Safety Features: Automatic shut-off if the unit temperature reaches or exceeds 950°F, displaying "Err" and illuminating the AL light.
- Components: Includes a shut-off rod, shut-off rod limit screw with lock nut, handle assembly, mould guide assembly with wing nuts, mould guide support screw, mould stop assembly with thumb screw.
Usage Features:
- Assembly: The furnace comes partially assembled; the shut-off rod and operating handle must be installed prior to use. This involves sliding the shut-off rod into the valve, attaching the handle to the pivot stud with a screw, and threading the shut-off rod limit screw into the alignment plate.
- Temperature Setting: Users can adjust the desired temperature by tapping the Up or Down buttons on the digital controller. The SV display will flash, allowing for 10-degree increment adjustments. Once set, the furnace automatically cycles on and off to maintain the target temperature.
- Warming Shelf: Located on the rear rim of the pot, this shelf allows for pre-heating single, double, and four-cavity mold blocks. Pre-heating molds helps reduce the time needed to produce good, wrinkle-free bullets.
- Mould Guide – Alignment and Use: The Mag 25 features an adjustable mould guide designed to accommodate various mold brands (Lyman, RCBS, Saeco, Lee). The guide has two steps on its rails to fit different molds. Adjustment involves loosening wing nuts to position the mold below the drain spout, leaving about 1/4" space, and then tightening. Side-to-side alignment with the sprue plate hole is achieved by loosening a bolt at the back of the guide. An adjustable mould stop allows users to position the mold accurately under the drain spout for consistent filling, especially with multiple-cavity molds.
- Bottom Pour System: The shut-off rod limit screw controls the height the shut-off rod can be lifted, thereby regulating the flow rate of molten lead from the spout. Users can adjust this screw to achieve the optimal flow rate for their specific mold.
- Adding Lead: When adding cold lead, the "PV" display will show a temperature drop, and the furnace will automatically reheat to the set temperature.
- Initial Use: Before first use, it is recommended to turn on the empty furnace and set it to the desired temperature for 10-15 minutes in a well-ventilated area (preferably outdoors) to burn off any protective oil, as the unit may smoke initially.
Maintenance Features:
- Cleaning the Shut-Off Valve: Dripping from the valve can occur due to dirt or grit in the molten lead. Fully opening the valve can often clear debris. If not, the furnace should be drained, allowed to cool, and the shut-off rod removed and cleaned.
- Clearing Clogged Drain Spout: If the drain spout is seriously clogged, the furnace should be heated to melting temperature. An unbent paperclip can then be used with pliers to feed through the drain spout to dislodge obstructions. Heat-resistant gloves and eye protection are essential during this process.
- Safety Precautions:
- Always wear basic safety garb: long pants, long sleeves, sturdy gloves, eye protection, and closed-toe shoes.
- Keep flammable items away from the casting area and do not operate the unit on flammable surfaces.
- Ensure adequate ventilation to avoid breathing fumes and dust.
- Never allow moisture near molten lead, as it can cause steam explosions.
- Never pick up or tip the furnace when hot.
- Do not cast when distracted.
- Do not smoke or eat while handling lead.
- Do not run the furnace without lead (except for initial warm-up).
- Wash hands immediately after handling lead, before eating or smoking.
- Use caution when adding bullet metal to molten metal to avoid splashing.
- Keep children away from casting and reloading areas.
- In case of "Err" display and AL light, unplug the unit and contact Lyman Customer Service.
The Mag 25 furnace is designed for user-friendly operation with a focus on safety and efficient lead casting. Its digital controls and adjustable features allow for precise and consistent bullet production.
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