Can't get the spacing for mousebite holes right

[armands256]

Could you please clarify how to correctly determine the spacing for mousebite holes?

I'm aiming to create 0.3 mm holes with 0.3 mm spacing between the edges of the holes, so I specified the cuts as follows:

Type: Mousebites
Drill: 0.6 mm
Spacing: 0.9 mm

However, when I measure the distance between the centers of the mousebite holes in the panel, I get 1.2 mm, and the spacing between the edges of the holes is 0.6 mm. The hole diameter is correct at 0.6 mm.

I am using KiCad v8.0 on Windows with KiKit v1.6.

[yaqwsx]

The spacing is slightly adjusted so:

• there an integral number of holes and
• they are evenly spaced and
• they cover the whole cut.

See the full algorithm:

KiKit/kikit/panelize.py

Lines 1546 to 1557 in ec75c91

	self.renderedMousebiteCounter += 1
	length = cut.length
	count = int(length / spacing) + 1
	for i in range(count):
	if count == 1:
	hole = cut.interpolate(0.5, normalized=True)
	else:
	hole = cut.interpolate( i * length / (count - 1) )
	if bloatedSubstrate.intersects(hole):
	self.addNPTHole(toKiCADPoint((hole.x, hole.y)), diameter,
	ref=f"KiKit_MB_{self.renderedMousebiteCounter}_{i+1}",
	excludedFromPos=True)

[armands256]

Thank you, @yaqwsx, for your suggestion! Inspired by your hint, I adjusted the tab width to match a round number of holes with the specified spacing. With the 2.7mm tab width, I achieved four evenly spaced holes with 0.9mm between centers. Perfect! Thanks again!