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How to spec DC motor for weld positioner

How to spec DC motor for weld positioner

How to spec DC motor for weld positioner

(OP)
Hello this is my first post here,

I am trying to figure out which motor I should use for my machine. I have a rotary table that I would like to transform into a weld positioner by adding a DC motor, gearbox (if necessary), speed control, and foot pedal. I would like the speed to be adjustable and controlled by a knob. I would also like to connect a foot pedal to the motor to function as an on/off switch. The rotary table has an 8" diameter and has a shaft diameter of 0.5" with a length of 1.5". The table's shaft needs to be cranked 40 times to complete one full revolution of the rotary table. I would like the rotary table to have a max speed of 10 rev/min meaning that the output speed to the shaft needs to be 400 RPM. I would also like to have a max load capacity of 50 pounds and the table itself weighs about 10 pounds. This is my first time doing a project like this, so I am looking for some help picking out a motor. I tried looking at existing weld positioners, but the motors used are either undisclosed or very expensive.

RE: How to spec DC motor for weld positioner

One more thing you need to figure out: The output torque required from the motor. You could probably estimate it by turning the knob yourself (with the 50# on the table). It's probably a small number.

RE: How to spec DC motor for weld positioner

(OP)
Thanks for your reply, Brian. I used a tool from Oriental Motor to calculate the torque and got 0.2739 oz*in. Does that number sound about right? It seems low to me, but like I said, I'm unexperienced with this kinda stuff.

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