RE: [CAD_CAM_EDM_DRO] Re: linear bearing based on ground flat stock

This drawing was referring to one rail set (2 harden rails) with 2 sets of
bearings whose separation is a Golden Ratio 1.618. http://goldennumber.net

If you're talking about one rail per link then perhaps this drawing.

Ain't ascii art wundervoll.

.--------------------------------------------------
. +---------+ || || +---------+
. | +-------+ || || +-------+ |
. | | V || || V | |
. | | +--------------------+ | |
. | | >| |< | |
. | | +--------------------+ | |
. | | ^ Screw ^ | |
. | +----------------------------+ |
. +--------------------------------+
. O O
. (link) (link)

If you're worried about dust then enclose each axis with way wipers and over
pressure it with a small supply of shop air (did this on a table saw fence).
Bellows would I think be an excellent cover as well.

My 2 cents.

-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com [mailto:CAD_CAM_EDM_DRO@yahoogroups.com]
On Behalf Of Graham Stabler
Sent: Monday, May 22, 2006 5:27 AM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: linear bearing based on ground flat stock

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Jack Hudler" <yahoo@...> wrote:
>
> Ok I just sused it. (Boot to the head)
>
> I don't see over constraint being an issue.
>
> You could rid yourself of the inside bearings and/or double up on
the top
> bearings.
>
> If you had some specs on the bearings and total load, I could try to
crunch the
> numbers on it.
>
>
> .---------------------------------------------------------
> . || ||
> . | || || |
> . V || || V
> . +--------+ +--------+
> . --> | | <-- --> | | <--
> . +--------+ +--------+
> . ^ ^
> . | |
>

I need three rails, each independant, they don't need to work in
pairs. No number crunching required, loads will be tiny I know it
will work but given the likely variation in the bars dimentions (the
ground stock is not made to the standard of a parallel for example) I
was worried that too many bearings would lock it up.

Graham