assembly choice with a ball bearing
assembly choice with a ball bearing
(OP)
hello, i want some help in choosing a ball bearing with their type of assembly as shown is attached.
best regard.
best regard.
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assembly choice with a ball bearing
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assembly choice with a ball bearingassembly choice with a ball bearing(OP)
hello, i want some help in choosing a ball bearing with their type of assembly as shown is attached.
best regard. Red Flag SubmittedThank you for helping keep Eng-Tips Forums free from inappropriate posts. Reply To This ThreadPosting in the Eng-Tips forums is a member-only feature.Click Here to join Eng-Tips and talk with other members! |
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RE: assembly choice with a ball bearing
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: assembly choice with a ball bearing
Ps.: Your arm is not rotating about a vertical angle.
pps. If you can find a ring bearing for the lower mount, we can fix you up with a hub unit bearing for above, GM Part No. 1585 1077
Note to admin: No, JJ is not paying me.
RE: assembly choice with a ball bearing
RE: assembly choice with a ball bearing
RE: assembly choice with a ball bearing
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: assembly choice with a ball bearing
RE: assembly choice with a ball bearing
RE: assembly choice with a ball bearing
If there are (understandable ) concerns that that a leaning column would look "weaker" or just goofy, then offset the upper pivot to accomplish the same thing.
Is the intent that the upper bearing will handle all the vertical load? Realistically only one bearing will handle the axial load anyhow.
The load/reaction arrows are pointing in directions that confuse me.
What are the magnitude of the reactions, and how often and how far will the arm be pivoted??
RE: assembly choice with a ball bearing
As mentioned above, the centers of rotation of the two different sets of bearings should be on the same vertical axis, or you get some very funny/difficult forces/reactions and motions of the boom. You would be better off making the vertical axis of the lower bearing the common axis, and moving the top bearing to the left, onto that axis. Then, you need a thrust bearing at one of the two locations (top or lower reaction point) to pick up the vertical loads.
Alternatively, you could leave the top rotational bearing at the top/center, add a thrust bearing for vert. loads. Then, at the lower location add a reinforcing/running ring to the column o.d. and use two cam rollers 15 or 20̊ each side of the boom center line, to pick up this horiz. reaction and keep the boom centered on the column.
Google ‘jib cranes,’ there are many manufacturers/designers of these cranes and there are many minor variations of the general theme. Some of the variations will have to do with exactly what you are trying to accomplish, with this crane, in you design/plant.
RE: assembly choice with a ball bearing
RE: assembly choice with a ball bearing
attached which draw, thank you to comment
best regard
RE: assembly choice with a ball bearing
Tbuelna's July 28 post looks pretty much like yours.
Are you sure yours has a ball bearing at the top?
RE: assembly choice with a ball bearing
For the top bearing, I rest my case with the hub unit bearing recommended previously. It has axial and radial capacity.
RE: assembly choice with a ball bearing
10s, 100s, 1000s, or 10,000s of pounds?
I think some capacity for static and even a little dynamic misalignment is required for the upper bearing, and probably the lower rollers as well.
Hence O'brien's use of a spherical roller for their upper bearing ( fully self aligning) , and the crowned rollers (to prevent edge loading) for the lower.
If none is provided, the mountings, housings, and even the bearings themselves may be sorely taxed, from which no good can come.
http://i1.wp.com/gearboxfailure.com/wp-content/upl...
pages 14 and 18 here-
http://www.timken.com/en-us/products/maintdiag/Doc...
http://www.schaeffler.com/remotemedien/media/_shar...
http://www.generalbearing.com/assets/files/Hyatt%2...
http://www.skf.com/binary/143-259464/14219-EN-Bear...
RE: assembly choice with a ball bearing
the bearing used are bearing has tapered rollers