calculating load required to move oz/in

[hagemeyp]

My goal is to figure out what motor strength I need for my fixed gantry moving bed design 36"x40" system.

I've followed the formulas on the Geckodrive page to calculate PRS and PPS, but when it comes time to plug in the load required (oz/in) to determine motor strength I'm stumped. Where do they pull out the 450 number? How can I calculate my own load required to plug into the formula?

[Jack Burton]

Looking at: Support

The 450 oz/in is an arbitrary number they chose for the example. They are notating the unit wrong though. It should read 450 oz-in. No division in torque units.

I have no idea what kind of system you're dealing with nor do I know anything about CNC machines for that matter but perhaps you could use a torque wrench to get your figure roughly. There are other ways by they're far more involved.

[Al_The_Man]

Try one of the free sizing programs such as Kollmorgen.
One main deciding factor in motor sizing is required accel/decel (inertia).
Static or break-away torque is only a start.
Al.