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Linear and Rotary Motion Discuss ball/Acme screws, R&P, linear slides and theory here.


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Old 01-01-2008, 09:36 PM
 
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Skateboard Bearings

would this work for bearing support for the "x" "y" and "z"
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Old 01-01-2008, 10:37 PM
 
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anybody there?
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Old 01-02-2008, 04:52 AM
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Make gif or jpeg out of it instead. Many more will look at it then.
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Old 01-02-2008, 05:06 AM
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Mechanically and physically, it looks like it would work - but seems like a lot of bits and pieces. Assembly and keeping tight tolerances will be a challenge in cnstructing.
Just my thoughts - best of luck- the bearings are often used by a lot of folks but I am not familiar
cheers Jim
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Old 01-02-2008, 05:03 PM
 
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i'm going to drill and tap the 1/2" bar stock for set screws to make adjustment easier. set screw on each side of the 1/2"x 1" cold roll steel for adjustment.
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Old 01-02-2008, 08:28 PM
 
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It should work depending on how accurately you can space apart your 608 bearings.
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Old 01-02-2008, 09:01 PM
 
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How much weight will this carry? I imagine that the jepg that Zumba shows will have a mirror image across from it to the right and the load will be from the top? Are the 6008 bearings anchored to the "L" shaped pieces? And the 1" x 1/2" is the "track" - correct? Please provide a better detail and we can study it. I have some concerns...
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Old 01-02-2008, 10:01 PM
 
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it will support about 100 lbs. on the "x" and about 50 lbs. on the "y" and yes the 608 bearing are anchored to the 3/8"x3" angle iron and the 1/2"x1" is the track. there are two on each side of the table for the "x" two on the gantry for the "y". and the mirror image would be on the left of the table.
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Old 01-02-2008, 10:09 PM
 
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the angle iron will be 16" long and there will be two set of bearing on both ends. the bearing will be set at 3" apart on the "x" the "y" will be 10" long and have one set of bearing on each end
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Old 01-03-2008, 07:49 AM
 
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From my exsp. use three bearings on each side of your angle. Two on the load side and one on the buck side this aviods the binds caused by thickness changes in the rail. The rail will flex slightly between the rollors allowing it to roll smooth with less clearance between the bearings and the rails. Do keep the two bearing sides to the greater load side of the design. Just what I have done so far proves that the six rollors are better than eight on one shuttle. slot bottom roller for adjustments.

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Last edited by Verfur; 01-03-2008 at 07:53 AM. Reason: grafx agian
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Old 01-03-2008, 08:02 AM
 
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The rails have to run true to each other, so I would build them with that in mind like a set of linear rails then attach to the router table and set square with other rails. I think the easy way of doing that is to clamp one (same end on top and side rails) end then use the shuttle to set the spacing along the rail clamping every so often then tack on each side at same pionts ( small tacks as heat will defently move/ warp the rails). Or the hard way of drilling and taping the cold roll and then inserting an allen screw in from the bottom side of the square tubing. Niether will be perfect but either should work for a wood router on our type of budjet.

Just more thoughts
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Old 01-03-2008, 05:13 PM
 
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thanks verfur for the information
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