How to Mark and Drill Cup Hinges on Cabinet Doors — Step-by-Step Guide

Correctly marking and drilling for a cup hinge requires precision, as the distance from the 35 mm cup hole to the door edge fundamentally determines the kinematics and door overlay.

Fitting furniture hinges is one of the core tasks in cabinetmaking. Whether you are replacing a damaged front, assembling a bespoke kitchen, or building a TV sideboard according to your own plans – the exact positioning of the drill holes determines a clean reveal and gap alignment. An incorrectly placed hole causes the door to bind, hang crookedly, or fail to close altogether.

This technical guide is aimed at fitters, joiners, and skilled DIYers. It covers the standard installation of a concealed hinge (cup hinge) on wooden doors made from chipboard, MDF, or solid wood.

Preparation: Difficulty Level and Time Required

• Difficulty: Medium (requires accurate measuring and vertical drilling)
• Time required: approx. 15 to 20 minutes per cabinet door (for two hinges)
• Prerequisite: Knowledge of the required overlay type (full overlay, half overlay / twin overlay, or inset)

Required Tools & Materials

For the professional preparation and installation of cabinet doors, you will need the following tools and fittings:

• Cordless drill-driver
• Forstner bit (standard diameter 35 mm) with centre point
• Wood drill bit (diameter 2 mm or 3 mm for pre-drilling fixing screws)
• Bradawl
• Try square or combination square
• Tape measure or folding ruler
• Pencil (HB or H grade for fine lines)
• Chipboard screws (countersunk head, drive PZ or TX, typically 3.5 x 16 mm)
• Matching cup hinges including cruciform mounting plate

The Theory: Understanding the C-Dimension and System 32

Before the drill bit touches the wood, two fundamental units of measurement in cabinetmaking must be understood.

The so-called C-dimension (cup drilling distance) defines the distance from the edge of the cabinet door to the rim of the 35 mm cup hole. With standard hinges, this dimension usually lies between 3 mm and 6 mm. This measurement is crucial for determining how far the door overlays the cabinet carcase.

The carcase itself is generally drilled according to System 32. This means: the distance of the front row of holes to the front carcase edge is exactly 37 mm. The vertical pitch between the holes is always 32 mm. The cruciform mounting plate of the hinge is aligned with this row of holes.

Step-by-Step Guide: Marking and Drilling the Cabinet Door

The following steps describe the installation of a standard hinge with a 110° opening angle and 35 mm cup.

Step 1: Determine the Position of the Hinges on the Door

Lay the cabinet door with the inner side facing upwards flat on a sturdy, clean workbench. Determine the vertical position of the hinges. A common standard measurement from the top and bottom edge of the door to the centre of the hinge cup is 100 mm or 120 mm. Mark this height with a fine pencil line across the edge.

Step 2: Mark the Drilling Centre (C-Dimension)

Now determine the exact centre point for the Forstner bit. The formula is: Half the cup diameter (17.5 mm) + desired C-dimension (e.g. 4.5 mm) = distance of the centre point from the door edge. In this example, mark the centre point exactly 22 mm away from the lateral door edge on the height line drawn in Step 1. Press the bradawl lightly into the timber at this intersection to create a pilot mark for the centre point of the drill bit.

Step 3: Drill the Cup Hole

Clamp the 35 mm bit into the cordless drill. The standard drilling depth for a hinge cup is 11.5 mm to 12.5 mm. Since standard furniture doors are often only 16 mm or 19 mm thick, extreme care is required to avoid drilling right through the front. Ideally, use a drill stand or a depth stop. Alternatively, mark the required depth on the bit using a piece of adhesive tape. Place the centre point into the punched mark. The bit works like a milling cutter through the material – drill at medium speed, with steady pressure, and at an exact 90-degree angle. Clear the wood shavings regularly.

Step 4: Insert and Align the Cup Hinge

Press the hinge cup into the freshly drilled hole. It must fit snugly and sit flush with the wood surface. Now place the try square against the outer edge of the door and against the hinge arm to align the hinge at an exact 90-degree angle to the door edge. If the hinge is skewed, the door will bind later.

Step 5: Mark and Pre-Drill Fixing Screws

When the hinge is aligned perfectly square, mark both lateral fixing holes (the hinge flanges) using the bradawl. Remove the hinge once more and pre-drill the markings with a 2 mm wood drill bit to a depth of approximately 10 mm. This prevents the chipboard from splitting when driving in the screws. Reinsert the hinge and fasten it with chipboard screws (3.5 x 16 mm).

Step 6: Mark the Position on the Carcase (Mounting Plate)

Now the counterpart, the cruciform mounting plate, must be fitted to the cabinet carcase. If your carcase has no pre-drilled System 32 line of holes, you will need to measure manually. The setback of the drill holes from the front edge of the carcase is 37 mm. To calculate the exact vertical height, measure the distance from the bottom edge of the cabinet door to the centre of the fitted hinge arm. Transfer this dimension onto the carcase – subtracting the bottom door reveal (the gap between the bottom of the door and the carcase base, usually 2 mm to 3 mm). Draw a horizontal line at this calculated height. The drill holes for the mounting plate sit on this line, precisely 16 mm above and below the centre (corresponding to System 32).

Note for large furniture units: Especially when constructing large wardrobe carcases, such as a 2-person wardrobe, transferring dimensions accurately onto side panels up to 2 metres high is critical, as minor measuring errors compound across long distances.

Step 7: Screw the Cruciform Mounting Plate and Hang the Door

Pre-drill the markings on the carcase and screw the mounting plate into place. Now bring the door up to the carcase. Depending on the fitting system, the hinge arm is either slid onto the plate and secured with a retaining screw, or (with modern clip-on hinges) pressed onto the baseplate without tools until it audibly clicks into place.

3D Adjustment: Perfecting the Door Reveals

After hanging, a door rarely sits perfectly right away. Concealed hinges provide screws for three-dimensional fine tuning:

1. Depth adjustment: Loosening the rear screw on the hinge arm allows you to adjust the gap between the door and the carcase (usually +2 mm / -2 mm). This ensures the door does not rub against the carcase when closing, while preventing an excessively large gap.
2. Height adjustment: The cruciform mounting plate features adjustment screws (or slotted holes). These allow the entire door to be shifted up or down by several millimetres to align flush with adjacent fronts.
3. Lateral adjustment (overlay adjustment): The front screw on the hinge arm shifts the door to the left or right. This regulates the vertical reveal between two doors (e.g. on a half overlay / twin overlay setup).

Common Installation Errors and How to Avoid Them

• Drilled too deep: A classic error when using a Forstner bit. If the centre point breaks through the front of the door, the panel is ruined. Always use a depth stop or a drill press.
• Wrong hinge selected: A hinge designed for a full overlay (door sits fully over the carcase side) will not work for an inset door (door sits inside the carcase openings). Check the crank of the hinge arm before drilling.
• Crooked alignment: If the cup hinge is not fastened at an exact 90-degree angle, the mechanism will experience torsional stress when opening. This often renders the soft-close damper ineffective.

FAQ – Frequently Asked Questions About Hinge Fitting

How many hinges do I need per door? That depends on the height and weight of the door. For standard doors up to 900 mm high, two hinges are sufficient. Up to 1600 mm, three hinges should be used, and up to 2000 mm, four hinges. The weight of the front (e.g. heavy MDF with a mirror) may require an additional hinge. For upward-opening flap doors instead of standard hinged doors, fit gas struts for heavy flap doors instead, with their lifting power rated in Newtons.

What should I do if a screw hole has stripped? If the small fixing screws for the cup hinge no longer grip the wood, the holes can be drilled out to 5 mm or 8 mm and plugged with glued wooden dowels. For a permanent, heavy-duty repair, inserting a threaded insert (Rampa insert) is recommended.

Are there different cup sizes? The absolute industry standard for cabinet doors is 35 mm. For very light or narrow doors (e.g. on small bathroom cabinets), compact cup hinges with a diameter of 26 mm are also available.

Does the carcase strictly have to be drilled to System 32? No. System 32 is the industrial standard that facilitates manufacturing. When designing a bespoke furniture unit from scratch, such as a low TV media unit with custom compartment dimensions, you can screw the mounting plates in any position, provided the 37 mm setback from the front edge is maintained.

Related Categories and Projects

Proper furniture construction does not end with hinges. When optimising the internal layout of your cabinets or planning specialised furniture, additional fittings and hardware play a vital role.

When building kitchen wall units above a sink, integrating functional accessories is essential. A wall cabinet dish drying rack requires precise planning of internal clear dimensions and can clash with hinge arms if not measured accurately. Always ensure sufficient clearance between the cruciform mounting plate and the rack frame.

If you are planning office furniture, cable management is a key consideration. A cabinet section housing computers or printers should be fitted with a desk cable grommet or back-panel pass-through during the fabrication stage. These holes (often 60 mm or 80 mm) are cut using the same principle as hinge cups, using a suitably sized larger Forstner bit or hole saw.