Thread: Linear Motion , CHEAP!!
-
29-01-2011 #11
Hi Phil,
Mostly I think it is the weight of the gantry, spindle etc. pressing down onto 4 bearing races which are only about 10mm wide. The contact patch (per bearing) is probably less than 0.5mm long, so in terms of area it is pretty small. I've not weighed the gantry system but it must be 20kg or more, so the stress (force/area) is pretty high. Aluminium is fairly soft so these lines are appearing. I think the cutting forces are tiny compared to the static weight running back and forth over many cycles.
Having said that, a few tiny chips have slightly pitted the surface where they've been run over. But I quickly stopped most of these occuring by using small screens along either side of the x axis.
I agree with Ross and Mark and anything which either increases the contact area (width or quantity of rollers) or increases the hardness of the ali rail (e.g. steel wear strip) should help. Wide nylon rollers are worth a go.
I have never had to do this but I suspect it is possible to calculate by using the force/area (gantry weight in newtons / area in m2) compared to some surface stress value for aluminium.Last edited by routercnc; 29-01-2011 at 10:34 PM. Reason: update
Thread Information
Users Browsing this Thread
There are currently 1 users browsing this thread. (0 members and 1 guests)
Similar Threads
-
eBay: Job Lot of Linear Motion Components
By grunt-will in forum Items On eBay UKReplies: 0Last Post: 08-04-2014, 02:28 PM -
balscrews from linear motion bearing and rails, question about sizing
By Boyan Silyavski in forum Lead Screws, Nuts & SupportsReplies: 3Last Post: 18-08-2013, 08:11 PM -
Pcb-linear motion solutions
By kyris31 in forum Gantry/Router Machines & BuildingReplies: 2Last Post: 20-02-2013, 10:14 AM -
Design issues with linear motion...
By rob_colby in forum General DiscussionReplies: 3Last Post: 05-01-2011, 12:13 AM -
Looking for a reliable cheap linear system pls
By psiron in forum Rails, Guideways & BearingsReplies: 3Last Post: 07-06-2010, 04:18 PM
Bookmarks