{"id":8320,"date":"2026-08-16T02:12:31","date_gmt":"2026-08-16T02:12:31","guid":{"rendered":"https:\/\/jxlampshade.com\/?p=8320"},"modified":"2026-08-16T02:12:31","modified_gmt":"2026-08-16T02:12:31","slug":"%e3%82%ac%e3%83%a9%e3%82%b9%e3%83%a9%e3%83%b3%e3%83%97%e3%82%b7%e3%82%a7%e3%83%bc%e3%83%89%e3%81%ae%e7%a9%b4%e3%81%a8%e5%88%87%e3%82%8a%e6%8a%9c%e3%81%8d","status":"publish","type":"post","link":"https:\/\/jxlampshade.com\/ja\/glass-lamp-shade-holes-and-cutouts\/","title":{"rendered":"\u30ac\u30e9\u30b9\u30e9\u30f3\u30d7\u30b7\u30a7\u30fc\u30c9\u306e\u7a74\u3068\u30ab\u30c3\u30c8\u30a2\u30a6\u30c8\uff1a\u8cfc\u5165\u8005\u304c\u6307\u5b9a\u3059\u3079\u304d\u30dd\u30a4\u30f3\u30c8"},"content":{"rendered":"

A hole in a glass lamp shade may carry the shade, locate it, give a cable a path, accept a screw, or clear part of the fixture. That makes the opening an engineered interface, not a decorative afterthought.<\/p>\n

The useful question is not simply, "What diameter is the hole?" A supplier also needs to know where the measurement starts, which way the hole axis points through a curved wall, what hardware touches the glass, when the opening is produced, and how the finished part will be inspected. Those decisions affect the forming route, secondary processing, tooling, sample plan, and quotation.<\/p>\n

This guide explains how to specify glass lamp shade holes and cutouts for a custom fixture. It is written for design and procurement review, not as a do-it-yourself drilling tutorial. Do not drill an installed shade or glass of unknown material and treatment. Have the manufacturer confirm whether the proposed operation is suitable for the specific glass and production sequence.<\/p>\n

\"\u30a8\u30f3\u30b8\u30cb\u30a2\u30ea\u30f3\u30b0\u30d9\u30f3\u30c1\u4e0a\u306e\u4e2d\u592e\u958b\u53e3\u90e8\u3001\u5074\u9762\u7a74\u3001\u30b1\u30fc\u30d6\u30eb\u30ab\u30c3\u30c8\u30a2\u30a6\u30c8\u4ed8\u304d\u30ab\u30b9\u30bf\u30e0\u30ac\u30e9\u30b9\u30e9\u30f3\u30d7\u30b7\u30a7\u30fc\u30c9\"<\/p>\n

Start with the job the opening must do<\/h2>\n

An opening can look correct in a rendering and still fail during assembly. Define its function before choosing its shape or process.<\/p>\n

\n\n\n\n\n\n\n\n\n\n
Opening function<\/th>\nWhat it interfaces with<\/th>\nWhat the buyer should control<\/th>\n<\/tr>\n<\/thead>\n
Central mounting opening<\/td>\nSocket, threaded stem, retaining ring, cap, or canopy hardware<\/td>\nFinished diameter, bearing surface, concentricity, gasket and washer stack<\/td>\n<\/tr>\n
Side mounting hole<\/td>\nSet screw, pin, clip, bracket, or standoff<\/td>\nHole count, angular spacing, height, axis, screw-tip contact, local clearance<\/td>\n<\/tr>\n
Cable exit<\/td>\nInsulated cable, strain relief, sleeve, or grommet<\/td>\nMinimum clear path, edge condition, bend path, assembly sequence<\/td>\n<\/tr>\n
Vent or service opening<\/td>\nAir path, access tool, sensor, or removable fastener<\/td>\nOpen area, location, cleaning access, appearance from normal viewing angles<\/td>\n<\/tr>\n
Slot or notch<\/td>\nFixed bracket, tab, cable, or anti-rotation feature<\/td>\nEnd radius, width, depth, corner condition, insertion direction<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

The same nominal diameter can serve very different jobs. A center opening held between broad gaskets does not behave like a small side hole contacted by a screw. Give the supplier the complete interface rather than asking the glass to be designed around one isolated number.<\/p>\n

Choose the opening route before fixing the drawing<\/h2>\n

Glass shade openings can be created during forming or by a later operation. The feasible route depends on glass family, wall shape, opening geometry, production quantity, surface finish, and treatment sequence. It also depends on the equipment and fixtures available to the manufacturer.<\/p>\n

\n\n\n\n\n\n\n\n\n\n
Route<\/th>\nTypical reason to consider it<\/th>\nDecisions that still need confirmation<\/th>\n<\/tr>\n<\/thead>\n
Formed or molded opening<\/td>\nRepeated geometry, a neck or lip, integrated mounting feature<\/td>\nTooling, draft, seam position, local wall, final finishing, dimensional variation<\/td>\n<\/tr>\n
Opened and finished after forming<\/td>\nA blown or pressed blank needs its mouth brought to final size<\/td>\nCut line, grinding allowance, rim finish, final measurement surface<\/td>\n<\/tr>\n
Diamond-drilled hole<\/td>\nA round through-hole is needed in suitable annealed glass<\/td>\nSupport fixture, cooling, entry and exit condition, chipping criteria, cleaning<\/td>\n<\/tr>\n
Ground or machined cutout<\/td>\nAn opening needs adjustment, a slot, or a controlled contact face<\/td>\nCorner radius, edge finish, tool access, local wall and process marks<\/td>\n<\/tr>\n
Laser or other specialist process<\/td>\nFine geometry or a process-specific production case<\/td>\nGlass compatibility, available machine envelope, edge quality, cost and throughput<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

Corning describes laser systems that can drill holes and produce circles, slots, and other cutouts in certain strengthened and unstrengthened glass applications. That is evidence that the technology exists, not evidence that it is the right or available route for every three-dimensional lamp shade. Ask the actual supplier to identify the proposed process and its limits.<\/p>\n

\"Comparison<\/p>\n

Formed openings can combine fit and shape<\/h3>\n

A formed opening may include a neck, shoulder, flange, thread-like feature, or reinforced region. It can reduce secondary work when the geometry is stable and the quantity supports tooling. It can also introduce draft, mold seams, local thickness changes, or flash that must be understood before the buyer assigns a tight finished dimension.<\/p>\n

State whether the drawing describes the as-formed surface or a surface that will be ground afterward. If hardware bears on the opening, identify the final contact face. The mold dimension alone may not be the dimension that controls assembly.<\/p>\n

Drilled holes depend on support and sequence<\/h3>\n

Mechanical drilling removes material from a brittle part. The workholding, tool path, cooling, wall support, and entry and exit conditions all matter. A round hole through a flat panel is not automatically equivalent to a hole through a tapered or doubly curved shade wall.<\/p>\n

The drawing should not dictate a generic drill speed or tool merely because it appeared in a fabrication guide. Give the supplier the required result, access constraints, material, wall condition, quantity, and acceptance method. The supplier can then propose the operation and sample evidence.<\/p>\n

\"Central<\/p>\n

Specify central mounting openings as a complete stack<\/h2>\n

A central hole is often described as a pendant opening or lamp-holder hole. The label is useful, but the complete mounting stack determines whether the shade seats without rocking, binding, or point loading.<\/p>\n

Include these parts in the review:<\/p>\n

    \n
  1. The socket, threaded stem, or holder that passes through the opening.<\/li>\n
  2. Any upper and lower gasket that cushions the glass.<\/li>\n
  3. Washers, cups, caps, rings, or shoulders that spread the load.<\/li>\n
  4. The nut or retaining feature and how it is tightened.<\/li>\n
  5. Cable and strain-relief parts that also need clearance.<\/li>\n
  6. The assembled orientation and the direction of gravity.<\/li>\n<\/ol>\n

    Define whether the controlled hole size is measured at the inner face, outer face, narrowest section, or a gauge plane. A curved wall or tapered opening may have more than one valid diameter. If a cap must hide the hole, include its usable cover diameter rather than relying on a catalog name.<\/p>\n

    Do not treat nominal socket size as a finished glass dimension. Hardware sold under the same lamp-holder designation can differ in thread, shoulder, retaining ring, gasket, and installation arrangement. Send the production hardware or a controlled drawing of it.<\/p>\n

    Locate side holes from a mounting datum<\/h2>\n

    Side holes commonly accept screws, pins, spring elements, or brackets. Their position controls whether the hardware shares load evenly and whether the shade sits level.<\/p>\n

    Avoid locating a side hole from a decorative edge or an uncontrolled high point. Seat the shade on the surface that controls installation, then define a datum system. A practical drawing may use:<\/p>\n