If a screw shaft gets stuck in the threads, what are the ways to resolve this issue?
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What should be done if the part in question cannot be removed? At the same time, I found that screw breaks usually occur at the bottom of the thread, rather than on the last tooth where the thread is tightened. Have any of you encountered cases where the thread broke in the middle (without reduced shear force)? This post was last edited by chenhao0713 on 2009-2-6 13:01.]
1. Drill a hole with a drill bit slightly smaller than that of the screw, then remove the material from there. 2. Weld a screw that is slightly smaller than the original screw at the break point, and then twist it out. 3. Use a special flat shovel to remove it
Points 1 and 2 are understandable, but what if it’s a stainless steel bolt that has broken in the middle of its thread (stainless steel cannot be drilled using a drill, and a bolt that is broken in the middle cannot be welded)? What does point 3 mean? Could you explain it in detail?
Solutions for a screw that is broken inside its thread: 1. Drill and tap a hole at the broken end of the screw using a drill bit smaller than the bottom diameter of the screw, then insert a bolt to remove it. The rotation direction of the thread should be the opposite of the original one ； 2. Weld a round steel bar slightly thinner than the original screw to the broken end face of the screw; bend the tail of the round steel bar 90 degrees and use a sleeve to turn it out ； 3. Drill a hole at the fractured end face of the screw using a drill bit slightly smaller than the bottom diameter of the screw, in order to remove the remaining parts of the screw ； 4. If the broken end face of the screw is large, a flat chisel can be used to scrape along the edge of the broken end face in order to remove the remaining part of the screw. The idea shifts direction.
There are wire removal tools that can solve a small portion of such problems. It is also determined by the length of the remaining part. It is possible to drill holes, weld nuts or add elongated rods, as well as make grooves and perforations. If it really doesn’t work, block it and move to another spot!
The technicians in our unit make a small notch on the detached screw and then use a screwdriver to turn it, thereby unscrewing it out
You can try all the methods upstairs, 1. Finally, if it is truly impossible to retain the original threads, after cleaning the area, drill new larger threads to match a screw of slightly larger size. 2. If the screw diameter is to remain unchanged, a slightly larger circular hole is first machined; then, using a tight fit method (liquid nitrogen), a plug made of the same material is used to fill the original position, after which threads are cut. This post was last edited by Li Wei on 2009-3-25 08:17.]
What I often encounter is a situation where it is at the same level as the end face of the screw hole; common approaches include: 1) Using a drill bit slightly smaller than the diameter of the screw shaft to drill a hole and remove any remaining parts of the screw. 2: Tap out with a flat chisel. 3: Remove with pipe wrench (expose 2-3 turns). 4: Weld the screw or nut (open flame; generally not used in fire-prohibited areas).
7# Li Wei —————————————————————————————————————————————————— If the part is not large, electric discharge machining can be used
It varies depending on the situation: for bolts of larger size with a shallow fracture, it is possible to weld a thin rod or find a way to twist the bolt out using the irregular fracture surface； For smaller sizes, uneven fractures can be considered, or ways can be found to use a wrench to remove the broken bolt ； Unless there is a defect in the bolt material, the fracture site is usually near the end face of the screw hole, and the broken bolt can be removed by using a flat chisel or a flat-head screwdriver.
Everyone knows that a drill bit is needed, but how do we determine the positioning? First, we measure the size of the hole and select a drill bit for positioning; then we use a 2mm drill bit to create a center hole, followed by using a drill bit that is 0.1mm smaller than the tap to drill the holes, and finally we tap them again.
I’ve come across a tool specifically designed for removing broken bolts; it comes in different sizes to accommodate bolts of various dimensions. The method used is to drill a hole at the center of the bolt in order to pull it out. It is said to be a product from abroad.
The methods have been mentioned above, but I think the reason for breakage inside is, firstly, the low precision of tooth processing, and secondly, insufficient strength. It is recommended to upgrade the quality standard