Tig weld rack and pinion to cnc plasma frame?

[JAZZCNC]

It's easy to work out if you know the Dp (Diametric pitch) of the pinion which for 24T Mod1.5 is 36mm. Then times this by pi to give the Linear pitch before ratio which in this case is 113mm.

Now you can work out ratio you'll need to give the desired linear Pitch. 15t/60t will give 4:1 ratio so 113 / 4 = 28.25mm. For Plasma this would work ok.

Ps: Word of warning before ordering make sure 15t pulley will fit your motor shaft because there won't be lot of pulley left for grub screws etc after it's bored.