Ok so the final test we did this eve was to swap the drivers over for the y and z which are the same and also slowed the acceleration down further to 150 and this managed to run through the hole cut without stoping so tomorrow we will switch the drives back and keep the acceleration the same and see if that is still ok. What we did notice though is that the steppersare getting quite hot (45-50 deg) Im not sure if it is directly linked to the problem as it happened on the first test of the day but it spears that they need to be set to run cooler? Is it because they are set in parallel and not running very fast? Although I have a lot of travel the y and z only travel very small amounts at a time when cutting a board.