Re: extrusion of Linear Bearing pillow block question...

Hi Lloyd,

a couple things,

an extrusion of this design would cost less than $10.00 foot.

If you took a 2 inch square aluminum block and drilled and realmed a
hole, you would need to drill through solid, but since you need to
hold the raw extrusion it is only one additonal step. OK two drills.

MUCH faster to drill on a drill press and bore to size before reaming.

Second, if you machine the unit to length and tap the end, (10-32)
you could an end plate or just a bolt and washer. no high tolerance
grouve to cut, but sizing would need to be tight.

You could make a LOT of parts for just the cost of the die charge.

you could do this on a lathe of almost any size, or any mill.

Lathe would offer the C-clip grouve pretty easily. I'm sure I could
to 8 parts an hour, so $10 per part is not too far off for pricing.
and if you wanted it to be split, a saw cut would suffice.

and if you did it in a mill or lathe, you could push in a
Delrin/teflon or other sleeve and ream that in one additonal
operation while it was in the machine and still aligned.

A simple drill jug would offer the mounting holes for repeatable
alignment for just a few hours work.

I think I could do 500 parts for around $10.00 each, cost.
sell for $15 $20 ??

another $5 for reaming the busing, plus cost of the bushing.
say, $5 for Delrin or teflon? (just guessing on that price.)

or, add to that your bushing/bearing. 1,2 or 3 inch lengths.

Think there is much interest ?

Dave

--- In CAD_CAM_EDM_DRO@y..., "Lloyd Leung" <lloyd@l...> 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@L...