diff --git a/site_ansto/instrument/hrpd/motor_configuration.tcl b/site_ansto/instrument/hrpd/motor_configuration.tcl
index 24b80dcb..125f6594 100644
--- a/site_ansto/instrument/hrpd/motor_configuration.tcl
+++ b/site_ansto/instrument/hrpd/motor_configuration.tcl
@@ -89,10 +89,10 @@ Motor mx DMC2280 [params \
   maxSpeed 1\
   maxAccel 1\
   maxDecel 1\
-  stepsPerX 25000\
+  stepsPerX -25000\
   absEnc 1\
   absEncHome 7562793\
-  cntsPerX 8192]
+  cntsPerX -8192]
 setHomeandRange -motor mx -home 0 -lowrange 20 -uprange 20
 mx speed 1
 mx precision 0.01
@@ -109,7 +109,7 @@ Motor mom DMC2280 [params \
   stepsPerX -12500\
   absEnc 1\
   absEncHome 17694127\
-  cntsPerX -8192]
+  cntsPerX -4096]
 setHomeandRange -motor mom -home 0 -lowrange 180 -uprange 180
 mom speed 1
 mom precision 0.01
@@ -260,7 +260,7 @@ Motor stth DMC2280 [params \
   port $dmc2280_controller2(port)\
   axis F\
   units degrees\
-  maxSpeed 0.2\
+  maxSpeed 0.5\
   maxAccel 0.2\
   maxDecel 0.2\
   stepsPerX 125000\
@@ -272,21 +272,23 @@ stth hardupperlim 74
 stth softlowerlim -70
 stth softupperlim 70
 stth home 0
-stth speed 0.2
+stth speed 0.5
 stth precision 0.01
 
 #Default upper and lower ranges for vertical slits
-set vertSlitLowRange 25
-set vertSlitUpRange 95
+set vertSlitLowRange 20
+set vertSlitUpRange 100
 
 #Default upper and lower ranges for horizontal slits
-set horSlitLowRange 20
-set horSlitUpRange 25
+set horSlitLowRange 15
+set horSlitUpRange 35
+
+#Measured or computed slit motor steps per millimetre
+set slitStepRate 20180
 
 ############################
 # Motor Controller 3
 ############################
-#:TP at HOME
 #
 
 # Monochromator radius, focus
@@ -314,8 +316,8 @@ Motor ss1r DMC2280 [params \
   maxSpeed 1\
   maxAccel 1\
   maxDecel 1\
-  stepsPerX -20180\
-  motorHome 544860]
+  stepsPerX -$slitStepRate\
+  motorHome [expr 54.5/2*$slitStepRate]]
 setHomeandRange -motor ss1r -home 0 -lowrange $horSlitLowRange -uprange $horSlitUpRange
 
 Motor ss1l DMC2280 [params \
@@ -326,8 +328,8 @@ Motor ss1l DMC2280 [params \
   maxSpeed 1\
   maxAccel 1\
   maxDecel 1\
-  stepsPerX -20180\
-  motorHome 544860]
+  stepsPerX -$slitStepRate\
+  motorHome [expr 54.5/2*$slitStepRate]]
 setHomeandRange -motor ss1l -home 0 -lowrange $horSlitLowRange -uprange $horSlitUpRange 
 
 Motor ss1u DMC2280 [params \
@@ -338,8 +340,8 @@ Motor ss1u DMC2280 [params \
   maxSpeed 1\
   maxAccel 1\
   maxDecel 1\
-  stepsPerX -20180\
-  motorHome 2098720]
+  stepsPerX -$slitStepRate\
+  motorHome [expr 207.5/2*$slitStepRate]]
 setHomeandRange -motor ss1u  -home 0 -lowrange $vertSlitLowRange -uprange $vertSlitUpRange 
 
 Motor ss1d DMC2280 [params \
@@ -350,14 +352,13 @@ Motor ss1d DMC2280 [params \
   maxSpeed 1\
   maxAccel 1\
   maxDecel 1\
-  stepsPerX -20180\
-  motorHome 2098720]
+  stepsPerX -$slitStepRate\
+  motorHome [expr 207.5/2*$slitStepRate]]
 setHomeandRange -motor ss1d  -home 0 -lowrange $vertSlitLowRange -uprange $vertSlitUpRange 
 
 ############################
 # Motor Controller 4
 ############################
-#:TP at HOME
 #
 
 # Little is known about the Eularian Cradle
@@ -397,8 +398,8 @@ Motor ss2r DMC2280 [params \
   maxSpeed 1\
   maxAccel 1\
   maxDecel 1\
-  stepsPerX -20180\
-  motorHome 524680]
+  stepsPerX -$slitStepRate\
+  motorHome [expr 52.25/2*$slitStepRate]]
 setHomeandRange -motor ss2r  -home 0 -lowrange $horSlitLowRange -uprange $horSlitUpRange 
 
 Motor ss2l DMC2280 [params \
@@ -409,8 +410,8 @@ Motor ss2l DMC2280 [params \
   maxSpeed 1\
   maxAccel 1\
   maxDecel 1\
-  stepsPerX -20180\
-  motorHome 524680]
+  stepsPerX -$slitStepRate\
+  motorHome [expr 52.25/2*$slitStepRate]]
 setHomeandRange -motor ss2l  -home 0 -lowrange $horSlitLowRange -uprange $horSlitUpRange 
 
 Motor ss2u DMC2280 [params \
@@ -421,8 +422,8 @@ Motor ss2u DMC2280 [params \
   maxSpeed 1\
   maxAccel 1\
   maxDecel 1\
-  stepsPerX -20180\
-  motorHome 2058360]
+  stepsPerX -$slitStepRate\
+  motorHome [expr 204.1/2*$slitStepRate]]
 setHomeandRange -motor ss2u  -home 0 -lowrange $vertSlitLowRange -uprange $vertSlitUpRange 
 
 Motor ss2d DMC2280 [params \
@@ -433,8 +434,8 @@ Motor ss2d DMC2280 [params \
   maxSpeed 1\
   maxAccel 1\
   maxDecel 1\
-  stepsPerX -20180\
-  motorHome 2058360]
+  stepsPerX -$slitStepRate\
+  motorHome [expr 204.1/2*$slitStepRate]]
 setHomeandRange -motor ss2d  -home 0 -lowrange $vertSlitLowRange -uprange $vertSlitUpRange 
 
 proc mthGet {} { return [expr [SplitReply [mtth]]/2.0]}