lathe gurus machineing question???

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well i picked up a HF tubing roller and some square dies that are 1/2 inch wide. i need to roll some 1x2x1/8 wall aluminum rectgangle gonna take em to my buddy that has a lathe and we were gonna just open em up what im wondering is since ive never done it and hes still new at it should we open em up to exactly 2 inches or should they be maybe a 16th or so wider or does it even matter ????? thanks for your help350P 30A spool gun cut master 51  syncro 250 other stuff " take a dog off the street and make him prosper and he will not bite you sad the same cannot be said for man" i didnt use punctuation just to piss you off
Reply:Give it the clearance but no more than the 1/16"......zap!I am not completely insane..Some parts are missing Professional Driver on a closed course....Do not attempt.Just because I'm a  dumbass don't mean that you can be too.So DON'T try any of this **** l do at home.
Reply:thans zap350P 30A spool gun cut master 51  syncro 250 other stuff " take a dog off the street and make him prosper and he will not bite you sad the same cannot be said for man" i didnt use punctuation just to piss you off
Reply:I did a similar thing, I did a whole set of smaller grooves, 1/8, 3/16, 1/4 etc. on one side of the 1/2 groove and on the other a special groove for molded handrail tubing. But, before you cut the groove bigger, try rolling the tube right over the top of the 1/2 groove . I've rolled lots of flat bar on mine right over the top of the grooves.Ian TannerKawasaki KX450 and many other fine tools