objengrs
Mechanical
- Dec 10, 2002
- 11
I'm involved in some tests to see if a large industrial assembly can be safely delivered by rail and/or truck. (The few motors & gearboxes have rotors in the 1000-3000 lb. range, and spherical or cyl. roller bearings. Mostly they will later end up in rather slow speed rotation (<100 rpm), although a a couple components are geared up to >1500 rpm.
Some vendor's limits on shock and vibration levels during this transit are quite low, 1 to 2 g. Well, low compared to what truck & train makers design their vehicles for.
Anyway, they don’t want the bearings blocked (restrained) during transit. (Instead they seem more interested in rotating the whole drivetrain a a little bit every few minutes with an idler motor.)
Does anyone have a general rule-of-thumb about what size equipment gets bearing lock-ups or supports before transporting? (train, truck, forklift?)
Or, do you know of any industry standards or handbooks that address how fragile typical big machines are while transporting?
Some vendor's limits on shock and vibration levels during this transit are quite low, 1 to 2 g. Well, low compared to what truck & train makers design their vehicles for.
Anyway, they don’t want the bearings blocked (restrained) during transit. (Instead they seem more interested in rotating the whole drivetrain a a little bit every few minutes with an idler motor.)
Does anyone have a general rule-of-thumb about what size equipment gets bearing lock-ups or supports before transporting? (train, truck, forklift?)
Or, do you know of any industry standards or handbooks that address how fragile typical big machines are while transporting?