Re: [CAD_CAM_EDM_DRO] extrusion of Linear Bearing pillow block question...

Hi Lloyd:
Setscrews are a bad idea on bearings.
The one-sides pressure will misalign them at best, and distort them at
worst.
Circlips are the way to go if you can't achieve a press fit within an
ACCURATELY round bore.
A way for crummy holes ( but not TOO sloppy) is Loctite, (and a hammer when
you need to service them!)
Another really good way for lightly stressed applications is a bedding
compound; Moglice or gunstock bedding compound spring to mind.
Ron Ginger or Smoke should be able to expand on this theme further.
Ron, Smoke...The floor is yours!!!
Cheers

Marcus

----- Original Message -----
From: "Lloyd Leung" <lloyd@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Saturday, February 16, 2002 7:51 PM
Subject: [CAD_CAM_EDM_DRO] extrusion of Linear Bearing pillow block
question...


> Please, I'm just thinking publicly right now... so please feel free to
> correct me where appropriate (hopefully without flaming me :) )
>
> Short version:
> How would I hold the bearing in place on an extrusion?
> How much would you be willing to pay for extruded segments? (per foot
> lets say)
>
>
> Long version:
> When I was looking at some more detailed photos of linear
> bearing pillow blocks, I noticed a little c clip
> http://www.mscdirect.com/ProductImages/3541753-11.jpg
> Now this c clip is probably used in a self aligning bearing, or the
> pillow block itself is self aligning.
>
> What's the easiest way to hold the bearings inside an extruded aluminium
> block? C Clip or set screw. [I'm thinking set screw, but at a cost]
>
> C Clip
> ~~~~~~
> Pros:
> - Super easy installation of bearing-> pinch -> insert -> done
> - allows for self aligning bearings to work properly.
> Cons:
> - grooves needs to properly spaced apart to have proper fitting
> - grooves need to be cut/ground out.
>
> Set Screw
> ~~~~~~~~~
> Pros:
> - Cheap!
> Cons:
> - must tap the bloody block...
> - Self aligning bearings won't work. [but for the cost does it matter?]
> [or is there a way to make them selfaligning still, with a setscrew?
>
> It's probably cheaper to have a set screw, then a c-clip to
> manufacture... (I could be wrong).
>
> Mind you set screws are cheap, but tapping is a bi---.
>
> Or better yet, just sell them as blocks of 1'.
>
> How much would you be willing to pay for extrusions, which you could
> easily make into linear bearings?
>
> I don't know how much a c clip is, but I'm thinking cheap as well.
> However to make the little grove, would be more a pain (unless there's
> an easy way I don't know about, and that could well be, could someone
> inform me?).
>
> Not sure what's worse, the two little grooves, or one tapped hole.
>
> --
> Lloyd Leung
> Lloyd@...
>