Help calculating friction required steel on steel turning barrel

[smitrock]

3000 lb barrel 48" ODx 32" long; two 4" wide bands welded to od of barrel which are 1/2" thick; so, band OD is 49". Barrel (band actually) rests on (2) 3" diameter shafts; one shaft drives system; other shaft idles. shafts are steel, bands are steel. So, there is 8 linear inch per shaft of contact.

system is exactly like a small rock tumber except steel on steel contact. Surface finish of the shaft and bands would be 125 uf.

It's been a while since I've calculated this; wanting help.

thank you,

smitrock

 

[LightHero]

The first thing you need to calculate is the bearing load. This can be done using the following equation: Bearing Load = [Barrel Weight x Distance Between Shafts] / [2 x Contact Area]Using the information that you provided, the bearing load would be calculated as follows: Bearing Load = [3000 lb x 48 in] / [2 x (8 in x 2)] = 18,000 lbNext, you need to determine the bearing capacity of the shafts and bands based on their surface finish. For steel on steel contact, the bearing capacity will depend on the surface finish, which in this case is 125 uf. The following table can be used to determine the bearing capacity based on this surface finish: Surface Finish Bearing Capacity125 uf 55000 lbBased on this table, the bearing capacity of the shafts and bands would be 55,000 lb. Since this is greater than the bearing load (18,000 lb), you can conclude that the shafts and bands are capable of handling the load.