STEP 01
Separate the dimensions before choosing a system
Write height and depth on a sketch of the finished inside face. Put the repeating pitch on the vertical axis and the front setback on the depth axis. A 32 mm pitch does not imply a 32 mm setback. Kreg documents a 32 mm pitch and a 37 mm fence setback for its KMA3232; these are product references, not a universal cabinet specification. The planner starts with those example values, but the rear row, starting height, drill depth and clearances remain project inputs. Confirm the jig and actual supports before retaining any example setting.
STEP 02
Choose a grid phase you can reproduce
The grid start is a center height measured above the finished bottom edge. Subsequent centers are start + n × pitch, for whole-number n beginning at zero. A 64 mm start and a 70 mm start generate different levels even with the same pitch. Keep that phase identical on both sides and both rows. Do not restart the grid from the top when a bottom obstruction appears: a top-based series may land between the original positions. Leave a gap in the existing series and retain the common origin.
STEP 03
Account for the complete hole at the ends
The top and bottom clearances in this tool run from a finished panel edge to the hole rim. With a 5 mm hole, the center needs another 2.5 mm beyond the entered rim clearance. This distinction matters when a first center lies exactly on an apparent limit. The planner rounds the allowable index range to whole grid steps, then lists only centers inside the available height. These are layout clearances you choose; the arithmetic does not establish a material-specific edge-distance requirement or the strength of the joint.
STEP 04
Locate the rear row from the correct surface
Rear setback is measured from the finished rear edge of the side panel, not automatically from the inside face of a captured back. If the back sits forward of that edge, measure its actual position and evaluate the support body and shelf depth there. On a 560 mm side with equal 37 mm setbacks, row centers are 37 and 523 mm from the front. A 500 mm deep shelf may fail to reach one of those supports, depending on its placement. Check the real shelf and support geometry before using the row pair.
STEP 05
Carry the intended heights into a physical test
Select a low and high usable level in the map. Mark those heights on both inside faces from the same bottom reference and compare them before drilling. Record the pitch, start, row offsets and panel revision in the drilling worksheet. A position on the grid is a potential support location, not a shelf-top elevation: the support ledge and any shelf recess alter the working height. If a specific storage opening matters, mock up that support and shelf combination, measure the actual shelf surface, and revise the grid or storage plan before repeating holes.
Is 32 mm the same as 1¼ inch?
No. Exactly 1¼ inch is 31.75 mm. Use the measured or documented jig pitch; do not substitute a rounded label into a long repeating row.
References and model boundary
The manufacturer references describe their own jig systems. Project dimensions, grid phase, keep-out envelopes and remaining-skin requirements belong to your measured setup. The planner tests its stated geometry; use the actual hardware instructions and a physical test pair before drilling production panels.