Hi David,
Ttake a look a this snippet:
\version "2.19.82"
\paper { line-width = 65\mm }
<<
{
\new Staff \time 2/4
\newSpacingSection
\override Score.SpacingSpanner.strict-grace-spacing = ##t
\tuplet 7/4 { g'16 a' b' c'' d'' e'' f'' } g''8 r
}
{
\new Staff
\tuplet 3/2 4 { g''8 \acciaccatura a'' g'' g'' } g'' r
}
>>
Hope that helps!
Stéfano