Gantry measurements

Hello and greetings
Im having a problem with the gantry on my laser.
When i move it 1 inch its only moving 15/16. Its not off much but i need it to be really close to perfect. I adjusted the settings on the sd card. Increased the number but it did change it any. I also saved it before i dismounted the sd card. Any ideas please

Others know smoothie boards better than I but I’m sure they’d like to know what number you increased


The numbers i increased on the sd card was arm solutions configuration. Alpha step pre mm was 157.577
Beta step per mm was 157.575 am i on the right track. Thanks