Hi Chris a picture of the grinder and stand would help but I think you should use it like a bench grinder with a suport on center height. That way the grinding force is going downwards and you can have the support either side of the wheel as well which will suport the part you are grinding as you push if backwards.

Hi Chris, the instructions that came with mine says the adjustments should be made to put the centre of the disc over the centre of the workpiece. As JasonB has pointed out, the disc will cut in a slight arc, which will be away from the operator. If you have it behind the centre of your workpiece, it will have the tendency for the forces at the start of the cut to put the load more onto the movable jaw, which you should not do. Starting with the disc on centre will give an equal pressure to the centre of the work and most of the force will be down into the base and once the cut has started, providing it is adequately held, should not have any tendency to roll or flip-up and the cutting forces will be shared mostly by the base and the fixed jaw. If the workpiece is not adequately held, the disc will have the tendency to roll or flip the workpiece in the front, behind or on centre, but if it is behind, the chances are it will roll or flip-up the workpiece and out towards the operator.

Regards Nick.