Badminton Stringing Machines: Crank vs Electronic vs Drop-Weight

Last checked: August 2026 · Written by the player-led team at Badminton House

A racket's finished string bed depends less on whether a shop owns a drop-weight, crank or electronic machine than on how carefully the stringer mounts the frame and pulls the string. Each machine type holds tension differently, but a careful job on a basic crank machine can beat a rushed job on an expensive electronic one.

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Drop-weight, crank and electronic machines compared

Three mechanisms dominate badminton stringing. Drop-weight machines use a hanging weight and gravity. Crank machines lock tension mechanically with a hand crank. Electronic constant-pull machines use a motor that keeps correcting for string stretch until the target is reached. Each can produce a good job; the real differences are speed, running cost and how much they forgive an inexperienced operator.

The accuracy gap is real but easy to overstate. A stringing-machine manufacturer's own technical FAQ describes crank machines as "not constant pull" yet still "precise tension on every pull," while electronic heads are "constant pull" and "precise" but slower, and drop-weight machines are simply "constant pull" and "very slow" (Eagnas stringing machine FAQ). A general reference on stringing mechanics puts the actual failure mode plainly: the crank's lockout step "permits more tension loss than drop weight," while a constant-pull electronic head keeps pulling "as string stretching is taking into account," which is why it is generally described as the most consistent of the three (overview of stringing machine mechanisms). None of that guarantees a better racket. A well-maintained crank in practiced hands will consistently out-string a neglected electronic machine.

One manufacturer's own numbers put a figure on that accuracy claim: its microcontroller-driven electronic tension head is rated to hold roughly 1 lb of tension accuracy on every pull (Eagnas stringing machine FAQ). That is a single product's own spec sheet rather than an independently measured industry figure, so treat it as an example of what a well-built electronic head is designed to do, not a number every electronic machine on the market will match.

Why mounting points and stringer technique decide more than the machine badge

The machine type sets the tensioning method, but how the frame is held and how the string is pulled decides whether the racket comes back straight. More mounting and side-support points reduce the chance of the frame twisting during stringing, and badminton racquets need their own smaller hardware, separate from tennis, because the frame is thinner and lighter.

Machines mount a frame with two, four or six support points. Two-point mounting only holds the head tip and throat with no side support at all, which leaves the most working room but no protection against the frame flexing sideways as string is pulled. Four-point mounting adds one pair of side supports; six-point mounting adds two pairs. As the same manufacturer FAQ puts it, "the six-point mounting system provides the maximum supports and eliminates any racquet distortion. But it has the less operating space," while "the two-point mounting system provides only head (tip) and throat supports. There is no side support" (Eagnas stringing machine FAQ). This trade-off applies to racquet stringing machines generally, across tennis, squash and badminton alike. It still explains why a serious badminton setup differs from a tennis machine fitted with different clamps: the same FAQ lists a dedicated drop-weight for badminton frames, a smaller side-support jaw sized for the badminton head, and separate badminton string clamps and an awl, sold apart from the tennis hardware.

Mounting only prevents distortion if the stringer also works the frame evenly. The same manufacturer's stringing tips recommend pulling the main strings in an alternating left-then-right order rather than straight across, and cutting old string out one-above-then-one-below rather than side by side, specifically "to minimize the chance of racquet distortion." The same tips call for locking the turntable in place for the outer main strings and some crosses, so the string is not pulled at an angle. Skipping either habit can twist a light badminton head even on a six-point machine.

Picture two identical rackets going onto the same six-point machine back to back. The first stringer alternates main strings left-then-right and locks the turntable for the outer crosses; the second pulls straight across in one pass and leaves the turntable free. Both finish at the same number on the readout, but only the first frame is protected against the sideways creep that a one-directional pull and an unlocked turntable can introduce, because those are exactly the two habits the manufacturer singles out for minimising distortion. The machine did not change between the two jobs. The stringer's routine did.

The clamps that hold each string after it is pulled matter too, and not every clamp is built for badminton's tension range. Clamps are made from metal or composite resin; resin is cheaper but "occasionally they wont be able to hold the string over 65 pound tension," according to the same source. That ceiling sits well above where most badminton stringing happens, but a worn or cheap resin clamp can slip well before its rated limit, letting a string creep loose between pulls without the stringer noticing. A starting clamp (sold under names like the PP-600) is a related but different tool: it exists only to hold the very first string in place before any tension is on it, since an unweighted clamp otherwise sags under its own weight. It is a convenience for the first pull, not a source of extra wear on the string itself, and some fixed swivel-clamp machines skip it entirely.

How to spot a rushed stringing job on the finished racket

A rushed stringing job usually shows up as a warped or twisted head, cross strings that are not evenly spaced, or string that looks flattened where it crosses the clamps rather than round. None of these need a tension gauge; they are practical signs of work worth checking, not by themselves the legal definition of an illegal racket.

• Warped or twisted head: the clearest sign of a frame that flexed during mounting or pulling and never fully relaxed back. It usually traces to too few support points, an unlevel mount, or main strings pulled straight across instead of alternating sides.
• Uneven cross spacing: gaps that widen or narrow across the face point to a turntable that was not locked for the outer strings, letting the pull angle drift, or to a crank machine's per-pull tension loss compounding unevenly across dozens of pulls.
• Flattened or crushed string at the clamp points: a sign the clamp jaws were worn, dirty, or simply not rated for the tension being pulled through them, which can also mean the string lost tension slightly every time it slipped and had to be re-gripped. Composite resin clamps in particular can lose their grip well before their rated ceiling once they wear, so a shop that never replaces them is quietly working with less holding power than the day the machine was new.
• Loose knots or fraying near the grommets: usually a finishing-speed issue rather than a machine issue, and worth raising with the stringer directly. A knot that has been rushed can sit slightly proud of the frame instead of tucked flush against it, which is easy to feel with a fingertip even when it is hard to see.

A head twisted during stringing should be evaluated as a stringing-quality problem, not equated with a device that allows the racket’s shape to be changed, which is subject to a separate prohibition.

This is also why two rackets stamped at the same number on the throat can play differently. A crank machine's lockout step loses a little tension at the exact moment it locks, while a true constant-pull electronic head keeps correcting for string stretch until the reading holds, so the number written down and the tension actually left in the frame are not guaranteed to match by the same margin on every machine. Add in how many support points held the frame steady, whether the stringer alternated sides and locked the turntable, and how worn the clamps were, and one person's stringing can feel noticeably softer or tighter than another's at the same stated tension. The machine badge on the wall explains only part of that gap.

Questions to ask before you hand over your racket

You do not need to know a stringer's machine brand to judge whether they will do a good job. A handful of questions about mounting, pattern and finishing say more about the likely result than whether the shop runs a drop-weight, crank or electronic head.

• Does the machine mount badminton frames on supports sized for badminton, or on tennis hardware with an adapter? Badminton frames are thinner than tennis frames, and dedicated badminton side-supports, clamps and an awl exist precisely because the standard tennis hardware is not sized for them.
• Do they pull the main strings in an alternating left-right order, or straight across in one pass? This single habit is the one a manufacturer's own tips single out for minimising distortion, independent of which machine is doing the pulling.
• Do they lock the turntable for the outer mains and crosses, or free-hand the whole pattern? An unlocked turntable lets the pull angle drift on exactly the strings most likely to show it as uneven spacing.
• How old are the clamps, and have they ever slipped at the tensions you play at? Composite resin clamps can lose their grip well before their rated ceiling, letting individual strings creep loose between pulls without anyone noticing at the time.
• Will they show you the finished string bed before you leave? A straight head and an even cross pattern take seconds to check and tell you more than any number written on the frame.