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To ensure proper installation, fix the unthreaded end of the countersunk bolt from the expansion bolt to the top plate. It's essential that the centerline of the countersunk bolt aligns with the midpoint of the top plate. The top plate can be customized into various shapes depending on your needs. If it’s supported by a steel pipe, you can shape it into a groove for better stability. Be cautious to prevent the bolt from rotating along with the nut during tightening. Hex head screws are typically welded to the sides of the hex nut. Although the solder joints here are small, they must be strong and secure, as they will bear significant shear force when supporting heavy loads.
If a suitable screw isn't available at the moment, a steel bar can be used as an alternative. However, using a proper screw is always preferable—it offers better grip, requires less effort to turn, and feels more comfortable in hand. Before final assembly, use a grinder or angle grinder to smooth out the solder joint, base, and top plate to avoid any finger injuries during operation.
For repeated use or when supporting heavier loads, consider quenching the screw nut and expansion tube. Ensure even heating without overheating, as excessive heat may damage the internal structure. After cooling, apply some lubricating oil to the countersunk bolt and nut. Then, screw the nut onto the bolt and insert it into the expansion tube. Place a flat washer between the nut and the expansion tube for added stability.
Once assembled, your simple and practical screw jack is ready for use. Position the top plate within the groove of the channel steel. If there's a large height difference, place a wooden block under the base plate. Adjust the channel steel and tighten the hex nut to raise or lower its elevation. Rotating the hex nut once per week significantly reduces the number of adjustments and level readings, improving overall work efficiency.
You can also make different sizes of screw jacks by using various sizes of expansion bolts, which allows for flexibility in handling different components. While the production method remains similar, keep in mind that different bolt pitches may require slight modifications in setup and usage. This makes the system adaptable and versatile for a wide range of applications.