diff --git a/LuaLibs/CalcMachParamFromSW.lua b/LuaLibs/CalcMachParamFromSW.lua
index 4d342e4..b8bace5 100644
--- a/LuaLibs/CalcMachParamFromSW.lua
+++ b/LuaLibs/CalcMachParamFromSW.lua
@@ -108,9 +108,9 @@ while nPartId do
       local dTMin = ( dMF + MATERIAL.AMin) / MATERIAL.BMin * pow( 0.25 * dStrand, MATERIAL.KW) * pow( dSliceStep, MATERIAL.KZ) * pow( dStrandCount, MATERIAL.KN)
       local dTTrg = ( dMF + MATERIAL.ATrg) / MATERIAL.BTrg * pow( 0.25 * dStrand, MATERIAL.KW) * pow( dSliceStep, MATERIAL.KZ) * pow( dStrandCount, MATERIAL.KN)
       local dTMax = ( dMF + MATERIAL.AMax) / MATERIAL.BMax * pow( 0.25 * dStrand, MATERIAL.KW) * pow( dSliceStep, MATERIAL.KZ) * pow( dStrandCount, MATERIAL.KN)
-      local dFMin = dTotLayerLength / dTMin * 60
+      local dFMin = dTotLayerLength / dTMax * 60
       local dFTrg = dTotLayerLength / dTTrg * 60
-      local dFMax = dTotLayerLength / dTMax * 60
+      local dFMax = dTotLayerLength / dTMin * 60
       local dLayerTime = dTTrg
       if dLayerFeed == 0 then
          dLayerFeed = dFTrg