For an inset door, buy the hinge and mounting plate first, then make a test corner at the real door thickness. A cup hole that is only a little misplaced can leave enough adjustment to close the door but not enough clearance to open it. The useful test is the full swing, not just a photograph of an even closed gap.
Identify the whole hinge combination
Record the hinge part number, mounting-plate part number, door thickness and whether the cabinet is face-framed or frameless. An inset hinge arm and its plate are a system. A hinge described only as “110 degree” is not a complete specification. Different cranks, plates and fixing arrangements can share the same nominal opening angle.
Read the drawing for that exact combination. Blum’s planning tables illustrate why: minimum gap depends on front thickness, drilling distance and edge geometry. A table for a MODUL hinge is not automatically valid for a CLIP top hinge. Use the cited table to understand the variables, then obtain the current sheet for the hardware in your hand.
Do not confuse the cup edge with its center
Some drawings define drilling distance from the door edge to the edge of the cup hole. Others may dimension the center directly. For a 35 mm cup, the radius is 17.5 mm. If a particular instruction specifies a 4 mm edge-to-cup distance, the center is 21.5 mm from the door edge. That is an arithmetic example, not a universal hinge setting.
Write the dimension as a small sketch rather than a bare number on masking tape. Include the bore depth and door thickness. The point of a boring bit can extend beyond its cutting rim; verify the actual tool on scrap, not only the depth indicated by a collar. A shallow decorative groove on the show face reduces the available material.
| Record before drilling | Why it matters |
|---|---|
| Hinge and plate part numbers | Determines inset geometry |
| Actual door thickness | Controls cup depth margin and swing clearance |
| Cup-edge distance or center distance | Prevents a 17.5 mm reference error on a 35 mm cup |
| Plate setback and mounting surface | Face-frame and frameless layouts differ |
| Edge profile and planned reveal | Can change clearance during opening |
Build a meaningful test corner
Use an offcut of the door material and a second piece representing the cabinet side or face frame. Match the real thicknesses and mounting surfaces. Lay out the hinge centerline and plate location from the intended reference edges. Bore and install one hinge according to its instructions, supporting and clamping the small pieces securely during drilling.
Shim the mock door to the proposed reveal, then close and open it slowly. Watch the hinge-side edge at the start of the swing. Check that the door clears the case, an adjacent front and any nearby handle. Test the expected opening angle with the hinge in a sensible middle adjustment position, leaving useful adjustment for installation.
A successful loose hinge on two scraps proves only that corner. A tall or heavy door still needs the manufacturer’s hinge quantity and spacing guidance. Rails, shelves and drawer boxes may obstruct the actual hinge arms. Draw those obstacles on the inside face before transferring the layout.
Transfer one reference, then mirror deliberately
Mark door tops and show faces. On a pair, label left and right hinge edges. Do not assume flipping a jig automatically produces the correct mirror: a fence that referenced the outside edge can end up referencing a different face after a flip. Set the jig on both doors without drilling and compare the intended positions.
Make the first real cup hole, inspect it and test the hinge seating before boring the rest. Clear chips and verify the stop has not moved. If a hinge flange rocks on fibers around the cup, clean the seating surface rather than pulling it flat with screws. Use the specified pilot holes and fixings so the screw does not shift the hinge as it enters.
When the door rubs
Check seating and the documented adjustment first. Then compare the live installation to the successful mockup. A plate mounted farther forward, a thicker finished edge or the wrong plate can explain rubbing without any change to the cup hole. Do not enlarge the cup at random; the original location is your evidence. If the test corner never worked, change the hinge combination or layout before risking another door.
Sources and further reading
Prepared for Unfinished Wood under an editorial pen name, with AI-assisted drafting and source review. Examples and diagrams are explanatory; they are not reports of hands-on product testing.
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