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

To hold a bearing into an extrusion provided the bearing fits snugly, you do
not have to use a "C" clip. Most of them actually just use a "Star" or
"spider" "push in" retainer. This is a round spring steel ring with little
"diggers" all the way around the outside. When you push one in from each end
correctly, it will dig in to the extrusion and hold the bearing in place. I
even have thomsons like that.

So NO setscrew, NO machineing the slot. Just a cheap clip.

There is also the bonding techniques..... Today I think you really can "glue"
just about anything together.

For some of the neatest extrusions available anywhere, check out:
http://www.paletti-profilsysteme.de/USA/usa.htm

You will need to go to the "Shop" link, then select profiles 40. They have
round holes and thick wall extrusions. The problem is that that particular
size/offer is that they do not have very big holes. then to make matters
worse, their next size up extrusions do not use round holes !

They do have rail Without any holes, just a solid block with T-Slots around
the outside.


Paletti has some really neat ( and I mean Really neat !) Linear motion
systems that run outside of their extrusions using round undrilled rail. They
just "snap" rail into holders that slide into the T-Slots.

Be sure to check out the "linear systems" link. I think they may have the
most rigid extrusions available as well.

But, do not get too cozy with the linear stuff....... I've seen the
prices,........they match the rest of the world when it comes to that.......
Somehow, the word "Linear" always means $$$$$$.

Chris L




Lloyd Leung wrote:

> 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@...
>
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