patio door rollers: Maybe?

[tpworks]

this guy believes it is possible.
http://accurate-inspections.com/pr%20cnc%20upgrade/
The MechMate site has a person whom used this type of bearing on his router
MechMate is a open source router that is similar to the old shopbot.

http://www.mechmate.com/forums/showt...t=sliding+door

[dertsap]

the problem a guy faces is :
if you can get those bearings so they only have .002 slop at the bearing ,that .002 gets exaggerated the further your assembly extends past the bearings ,greatly exaggerated, in order to get them tight enough to take up the slack the bearings smoothness is lost ,the parts simply do not match up 100% ,if you go any tighter those bearings won t turn ,or bind

another thing to concider is the out of roundness of the bearing , they are mass producted non precision parts
if they are out of round ,then you would need to add that to the slop already there
i have a dozen of them , one came out with somewhat smooth action , out of a few that ive modified ,
ive done many abortions in my life and this one isn t worth it if a guy wants a 100% solid machine

[rustamd]

I think you are looking at this from different side. This is just another alternative to homemade DIY linear movement.

If guy wants 100% solid machine he better be using THK style rails and ball screws. I think that guy would have no room in DIY forum, just my ¢.02

Remember this was just discussion

[dertsap]

i have my system in the diy forum , ive used v-groove bearings and it is very solid
i had looked at it from the side your talking about , i tryed it and was not satisfied with the results ,i'm not telling anyone not to do it but concidering the fact i work with high precision machining i do have a fair bit of knowledge of the difficulties a few thousands of an inch can cause




concidering ive tryed it , i thought i would share my 2 cent in this discussion

good luck

[zippy]

I tried those for a non-cnc linear motion project about 5 years ago. ran them on some 1/4" or 3/16" (don't remember) rod tacked to the center of two sides of some 1/2" square tube. It didn't work they were just to sloppy. most of us have probably looked them over at some point and said hmmm.

[Gerald_D]

These threads on this MechMate forum may be more applicable:

Handmade V-Rollers

Alternative ideas on V-roller shapes & materials

Gerald