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

Graham,
I if you want a good book that covers linear ways (bearing, hydrostatic,
aerostatic, and magnetic) extensively, see 'Precision Machine Design' by
Alexander H. Slocum, ISBN 0-87263-492-2; chapters 8 and 9. Don't worry the
math's not ugly at all.

He's pretty accessible via his MIT email address if you have questions (just
keep them short as he doing 100 things at once).

With your EDM access I'd take a stab at hydrostatic bearings or you can do what
Professor Slocum advised me; www.newwaybearings.com

Also I would advise anyone that wants to build there own machine tools to
seriously pony up the money and get this book.

Jack


-----Original Message-----
From: CAD_CAM_EDM_DRO@yahoogroups.com [mailto:CAD_CAM_EDM_DRO@yahoogroups.com]
On Behalf Of Graham Stabler
Sent: Sunday, May 21, 2006 3:11 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] linear bearing based on ground flat stock


I'm working away on a small triaglide in the background to my other
projects to prove the principle of using Mach for the parallel
kinematics for a 3-axis machine. I now have lots of super little
bearing assemblies for the arm joints taken from hard drives and I
also have three belt drive units from Epson printers, I know these
work well and are very fast indeed.

What I need now are three linear rails and carriages, they need to be
suitable for high speed, be cheap and light. I'm wondering about
using some ground flat bar stock as a linear rail and make a carriage
that uses normal radial bearings running on this. I'd drill the bar
stock at regular intervals and support it along its length.

I've seen something like this on a few machines including the
torchmate plasma cutters. I'm interested in knowing exactly how many
bearings I should use, I could for example have a side bearing and top
and bottom bearing at each corner of the carriage but that would seem
to be overkill and I wonder about overcontraint. I can get the
bearings very cheaply so I don't mind having 12 per carriages if I
have to.

Graham






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