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View Full Version : New Departure info on preload......



J Tiers
01-04-2009, 07:06 PM
http://img.photobucket.com/albums/0803/jstanley/pre01.jpg

http://img.photobucket.com/albums/0803/jstanley/pre02.jpg

http://img.photobucket.com/albums/0803/jstanley/pre1.jpg

http://img.photobucket.com/albums/0803/jstanley/pre2.jpg

Posted under the terms of fair use and educational use of copyrighted material

J Tiers
01-04-2009, 07:08 PM
http://img.photobucket.com/albums/0803/jstanley/pre3.jpg

http://img.photobucket.com/albums/0803/jstanley/pre4.jpg

http://img.photobucket.com/albums/0803/jstanley/pre5.jpg

John Stevenson
01-04-2009, 07:19 PM
Meaningless.
It doesn't say whether the double row bearings are the split type or solid. It gives no manufacturers axial tolerances before starting.

It's a generic meaningless text.

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J Tiers
01-04-2009, 07:22 PM
Meaningless.
It doesn't say whether the double row bearings are the split type or solid. It gives no manufacturers axial tolerances before starting.

It's a generic meaningless text.

.

That's pretty obnoxious ..........

Does any of what you say actually matter? what if it IS split? or isn't?

I don't see how you can blow it off as meaningless and generic... did you read the whole thing? There are numbers given later, and the numbers you ask for aren't needed for the discussion.

John Stevenson
01-04-2009, 07:27 PM
If it isn't split and it has 2 thou of axial movement no amount of dancing on a torque wrench is going to remove the play.

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J Tiers
01-04-2009, 07:57 PM
If it isn't split and it has 2 thou of axial movement no amount of dancing on a torque wrench is going to remove the play.

.

Ah.... you did NOT read it, I see......

That isn't "play", it is load-related deflection..... at a final rate of about 0.001" per 3500lb axial force........

If you take a closer look at the graph, I think you will see that 'play" as you call it, by which I assume you mean to refer to "clearance"....... would be a straight vertical line on that graph......

It would have to be, because "play" is free movement, which takes no force.......

a couple points....

A) One section (first two images) relates to double row, which already HAVE the preload, so "dancing" isn't relevant

B) The other relates to SEPARATE bearings, as you can easily see from the illustration. In that case, you can "dance on the wrench" until you have brinelled the bearings into a lump........ (or closed up the spacers.)


You may want to look more carefully and not jump to conclusions, because your statement doesn't make sense when related to the illustrations...