The images below illustrate the drawer guide hole locations for a three drawer stack cabinet using the most common reference point (from the bottom of the drawer front to the center of the 5mm drawer guide hole).
For all drawers that are not in the bottom position, the center of the 5mm holes will be 48mm from the bottom of the drawer front.
For bottom drawers, the center of the 5mm holes will be 58mm from the bottom of the drawer front (to clear the cabinet bottom).
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These images also illustrate the front to back positions of the 5mm drawer guides holes for a 608mm (23-15/16") deep base cabinet. These holes are positioned based on the drawer guide depth, and for the deeper drawer guides, there are three holes, where the shallow drawers only have two.
The shallowest under-mount drawer guide that Blum makes is a 9" slide, the shallowest cabinet that a 9" drawer guide will fit into is a 294mm (11-1/2"). In KCD, we will not allow you to make any cabinet that has a drawer in it less then 294mm (11-1/2") deep. The following is the drawer guide hole locations front to back for all the various depth drawer guides.
For cabinet depths from 294mm (11-1/2") to 355mm (13-15/16") we will machine for a 9" under-mount drawer guide. There will be one hole at 37mm from the front edge of the cabinet, and a second hole 192mm from the first hole.
For cabinet depths from 356mm (14") to 431mm (16-15/16") we will machine for a 12" under-mount drawer guide. There will be one hole at 37mm from the front edge of the cabinet, and a second hole 192mm from the first hole.
For cabinet depths from 432mm (17") to 507mm (19-15/16") we will machine for a 15" under-mount drawer guide. There will be one hole at 37mm from the front edge of the cabinet, and a second hole 128mm from the first hole, and a third hole 192mm from the second hole.
For cabinet depths from 508mm (20") to 584mm (22-15/16") we will machine for a 18" under-mount drawer guide. There will be one hole at 37mm from the front edge of the cabinet, and a second hole 224 mm from the first hole, and a third hole 192mm from the second hole.
For cabinet depths from 585mm (23") to 661mm (25-15/16") we will machine for a 21" under-mount drawer guide. There will be one hole at 37mm from the front edge of the cabinet, and a second hole 224mm from the first hole, and a third hole 256mm from the second hole.
For cabinet depths from 662mm (26") and deeper, we will machine for a 24" under-mount drawer guide. There will be one hole at 37mm from the front edge of the cabinet, and a second hole 224mm from the first hole, and a third hole 128mm from the second hole.