Backlash , Any suggestions ?

[JAZZCNC]

To me it just looks like the tool geometry is wrong,

+1 on this. If you had backlash issues that V carved lettering would show it straight away.!

[magicniner]

There's a kerning fault with the lettering, but the cutting looks good.
You almost always need to manually kern in cad as very few software packages do the job well.

[philgiggins]

Hi all,

Thanks to everyone who has replied.
I have been doing some experimenting and have identified the problem. I originally had some backlash issues with the gearbox that drives the 2 pinions, it turned out it was a stretched belt ( my own fault from over tightening ) After i sorted that out i was still getting slight lines on profile cuts ie. 3 passes- slight step on each, and as it seemed to be occuring at a point where the axis changed direction i didnt look elsewhere for the problem. I was cutting on Fri and i got this massive step (see picture) which made me realise the problem was with lost steps and not backlash.
This is where i am looking for some advice ... i contacted the company i bought motors, drivers and gearboxes off. The drivers are leadshine Dm856 and the motors are 4.5nm. They are running off a 70v power supply. I suspected at the time of purchase the motors where slightly undersized but i was assured they (the company i purchased from) ran a similar sized machine with a similar weight gantry from these motors and drivers. I am using an ethernet smoothstepper as my controller. The company reckon mach3 is possibly the problem (they use Usbcnc) But so many people use mach 3 with no problems ,i have doubt that this is the case.
As you can probably see from my pictures i have built this on a budget (no hiwins on X etc.) But it runs very smooth and is very very sturdy. My point is ,this machine will be in use most days as part off my business and i need it to be reliable. Am i as well just biting the bullet and purchasing bigger motors and drivers now , or are these correctly sized ?
Sorry this is so long and rambling :)

Thanks Philip