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Yes you can. They take less load inverted but it's usually not a problem. There are other ways to do it though, on the inside or on another frame extrusion.
Regards,
Sven
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First post!
I'm building a moderately large gantry-type CNC router, 57" X travel and 33" Y travel. I'm wondering if it is ok to have the linear ways/bearings for a 57" long X axis mounted underneath, instead of on the sides of the table. I'm wanting to do this to make it almost impossible for chips to get into the bearings. Is there any mechanical disadvantage to using the bearings in this manner? The rails are going to be hiwin 20mm HGR type. The frame is going to be all 8020 or Tslots extrusions.
Thanks for your help!
Aaron
Yes you can. They take less load inverted but it's usually not a problem. There are other ways to do it though, on the inside or on another frame extrusion.
Regards,
Sven
There is absolutely no problem with mounting the rails in an inverted fashion. The only difference is that the lever arm acting on the blocks is slightly longer. Depending on your setup, this may only be 2"... negligible, really.
As for load capacity, contrary to what you may think, there really isn't much difference between the two setups. The load acting on the bearings is a moment load, not a downwards vector load (gravity).
Unless you run your machine HARD, day in and day out, it's unlikely you'll ever wear out your bearings (assuming you don't install them crookedly). As a machine builder, you will probably build a new one long before the bearings die (unless you quit the hobby, god forbid). And you can always sell your half-worn bearings on ebay to recoup some $$$.
P.S. Ebay used-THK buyers beware.
Arron,
Your design is very similar to a Data Cut CNC router. I bought the plans and currently aquiring all the linear components.
Check out data-cut.com for pictures of exacatly what you want to do.
Chris at Data Cut has been extremly helpful.
Rod
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