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Also, is there a way to stop the entity from spinning?




Set phent_maxspeed(linMax,Null) and this will limit the entities linear speed to linMax and it's Rotational speed to Zero.

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constaint1[3]=1,0,0; //only allows movement on x axis?





That's right...so if your "chute" isn't lined up right, you'll get odd effects indeed.

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phcon_setparams1(constraint1, vector(1,0,0),nullvector,nullvector); // I thought that the second agument of this set the contraint axis?





I"m sorry Russel...constraint1 is the problem, but I gave you the wrong solution.

constraint1=phcon_add(ph_slider, my, 0);

There that should do it. Forget that constraint vector buisness, you are right; vector() is constraint axis. Sorry for the confusion.