diff --git a/LuaLibs/ProcessRoundArch.lua b/LuaLibs/ProcessRoundArch.lua
index c80d3bf..c9f69b6 100644
--- a/LuaLibs/ProcessRoundArch.lua
+++ b/LuaLibs/ProcessRoundArch.lua
@@ -111,10 +111,11 @@ function ProcessRoundArch.Make( Proc, nPhase, nRawId, nPartId, dOvmHead)
    -- se non di testa o coda ne verifico la lunghezza per eventuale spezzatura
    local nStep = 1
    local dStep = 0
+   local dLenMax = min( BD.LONGCUT_MAXLEN, 0.5 * b3Raw:getDimX())
    local b3Aux = EgtGetBBoxGlob( AuxId, GDB_BB.STANDARD)
-   if not Proc.Head and not Proc.Tail and b3Aux:getDimX() > BD.LONGCUT_MAXLEN then
+   if b3Aux:getDimX() > dLenMax then
       local dCrvLen = EgtCurveLength( AuxId)
-      nStep = ceil( dCrvLen / BD.LONGCUT_MAXLEN)
+      nStep = ceil( dCrvLen / dLenMax)
       dStep = dCrvLen / nStep
       EgtOutLog( string.format( 'CrvLen=%.1f StepNbr=%d StepLen=%.1f', dCrvLen, nStep, dStep), 3)
    end