Reading between the lines, the motors are only 200w or so, roughly 1/4 hp (probably 1/5th after losses), and the torque at the output Shaft ID about 6 ft-pounds, so not huge at 30-some rpm. They may be good for a bead roller, but it wouldn't be a particularly fast worker, or might be too fast (15 feet/min with 2" dies) but not have enough grunt for the sheet you want to form?
Probably you'd want to gear the motor down further (a lubricated chain and sprockets would be fairly efficient), to get more torque at the working dies? A few of the commercial small rollers use motors around that power output with 7 or so rpm on 2" dies, I believe, so a further 5:1 (or so) reduction should work?
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Dave H. (the other one):