Two different machines

[dbachman]

I have two machines and both have identical electronics, steppers and leadscrews yet I have to set the steps per inch twice as much on one machine than the other.. Am I missing something simple??

Thanks in advance.. Don   

[RICH]

Are the drives set the same? ie the microstep setting
RICH

[dbachman]

They are both set the same. This is the data sheet. I didn't know how to attach a PDF..

17452-MS 2 PHASE 1.8O STEPMOTOR DRIVER
CW250
SPECIFICATIONS:
Power Input: 20-60VDC
Control Inputs: +5V TTL<20mA Optically Isolated
Output Drive Current: 0-5A
Stepping: Basic: 1/1=1.8O
Microstepping: 1/8
Protection: Overheat/50% Current lock/Motor Phasing
Connections: Terminal Strips
Physical: L: 5-3/4" W: 3-3/4" H: 1-3/4" WT: 1.4lb
INPUT/OUTPUT CONNECTIONS:
Outputs:
VCC+: Input power Positive
GND-: Input Power Negative
A+ Wotor Winding Phase A+
A- Wotor Winding Phase AB+
Wotor Winding Phase B+
B- Wotor Winding Phase BInputs:
CP+ Clock Pulse Input/Leading edge
CP- Signal Return
CW+ "1"/"HIGH" Forward
"0"/"LOW" Reverse
CW- Signal Return
H/D Jumper to Gnd. for 1/8 Microstep
Gnd.
IOUT M1 M2 M3
1.5A 0 0 0
2.0A 0 0 1
2.5A 0 1 0
3.0A 0 1 1
3.5A 1 0 0
4.0A 1 0 1
4.5A 1 1 0
5.0A 1 1 1
OUTPUT CURRENT LIMIT SELECTION
Switch: 0="ON" lever Down
1="OFF" Lever Up
NOTES: When used above 3A output or Above 30OC, Module must be mounted to Heatsink/metal panel
or use fan to provide Axial air flow
Internal timer sets output to 1/2 of programmed Current after no input signal is received for 1/2 Second
to prevent motor heating.
Output is protected from motor miswires. Should motor oscillate/show erratic rotation/torque/reversing
problems, Check motor wiring to driver
Input CP+ (CW+ )
Input CP- (CW- )
Internal to Controller
330Ω
<20mA

[Hood]

These drives seem to be fixed at 1/8th stepping so if thats the case then the only other thing that I can think of  is you have 0.9 degree steppers on one rather than the normal 1.8 degree, but as you said they were identical that cant be the case.
Hood