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Glass harp rack selection guide
Choose a full slotted base when short, narrow, thin, or irregular glass cannot keep continuous contact across roller positions. Choose a roller base when the bottom edge can remain supported while sheets are moved between glass-processing steps.
For a glass processing plant, the wrong bottom support can turn a short or irregular sheet into a tipping risk. A production manager handling cutting output, edging WIP, tempering queues, laminated units, or IGU pairing needs to look first at the glass bottom edge—not simply reduce the slot spacing on a standard roller rack.
Hrack is a mobile glass sorting and WIP buffer rack, not a long-term warehouse A-frame. Its bottom can be configured through two separate support paths: nylon roller shafts for sheets that can travel on roller contact, or a full slotted base board for sheets that need more continuous support. The correct route depends on the glass geometry, thickness, weight, slot plan, and floor movement.
Full base or roller base: how each support path works
A roller base carries the lower edge at defined nylon roller positions. That rolling contact helps operators move sheets during short-distance plant-floor transfers, but it assumes the glass bottom edge can stay engaged across the roller layout. This is the practical starting point for more regular sheets whose length and shape bridge the support points without losing balance. A full slotted base uses a steel base with a slotted HDPE protection board to give short, high, narrow, or shaped glass a more continuous bottom path. It is not a universal upgrade and should not be treated as the default configuration: the base choice must follow the actual sheet geometry and handling route.
What changes for short, irregular, narrow, and thin glass
Short glass can lose the span needed to stay across roller contact and may tip toward an unsupported section; triangular and trapezoidal pieces can load one part of the base before the rest of the edge reaches support. Narrow pieces can sit off-center or lean into an adjacent slot, while thin glass—especially around 6mm in a wide slot—can shake during handling and increase chipping risk. Slot spacing is therefore a fit decision, not a fixed Hrack specification. Source records show project options such as 8–10mm, 12mm, 14mm, 14.3mm, and 25mm, but these values must not be merged into one standard model. Steel-core wire dividers with PVC or PVB sleeves separate sheets and reduce direct glass-to-metal contact; backrest cushioning, such as an EPDM strip or specified wood cushion, softens the lean against the rear frame. The slot count and divider spacing should be selected from the order mix, not copied from another project.
Foot lock versus wheel brake in a WIP rack
A normal caster brake restrains the wheel at the caster. Hrack’s foot-operated floor lock or lift-lock is a different stability path: when engaged, it is intended to take the moving rack out of ordinary rolling contact by locking the base to the workshop floor and, on the lift-lock arrangement, lifting the chassis so the wheels no longer carry the movement. That matters when a loaded rack is parked beside cutting, edging, washing, tempering, laminating, or IGU assembly work. Specify the actual floor condition and movement distance before selecting the lock arrangement. This operating role is why Hrack belongs in short-distance WIP buffering, sorting, and sheet pairing—not as a long-term bulk-storage A-frame.
Information to provide before requesting a base recommendation
- Give the minimum and maximum glass length, width, and overall sheet dimensions, plus the proportion of short, narrow, triangular, trapezoidal, or other irregular pieces.
- List glass thickness ranges and the single-sheet weight range; identify thin-glass orders that may shake in a wider slot.
- State the required slot count and describe the target slot-spacing range as an order-mix requirement, not as a borrowed standard model value.
- Name the preceding and following processes, required handling distance, floor surface and levelness, traffic or obstruction conditions, and where the rack must be locked.