Linear Bearings Vs Dual V Setup
Posted: Sun Sep 21, 2014 6:05 pm
I'm in the process of designing a laser engraver/cutter with a work area of 50" x 34" for the ability to cut a 1/3rd of a sheet at a time with pass thru for longer pieces. The XY stage will be T slot extrusion and heavy wall aluminum square extrusion. The frame will be welded square tube with the XY stage being bolted on with plenty of adjustment. I am not worried about mirror alignment or fabrication (Machinist by trade with a full fab/machine shop at my disposal)
I have on hand some USED nsk lu15 linear bearings and rails but I'm afraid that being used they will not hold up for very long with the speeds I'm shooting for (+1000mm/sec raster). I know I could replace them with some Hiwin 15mm bearing in the future but that would require dismantling the whole machine just to replace the linear bearings.
What I would prefer to use is some bolt on anodized aluminum V rails and metal or delrin wheels. I know they aren't as rigid a true linear rails but there isn't much force on them other than acceleration forces. (Which could be high as I would like to upgrade to NEMA 23 servos in the future.) I was wondering what peoples thoughts on this would be.
Should I design around a true linear bearing setup or should I go with the dual V setup where it is easy to work on and easy to replace parts?
Thanks for any advice
Carl
I have on hand some USED nsk lu15 linear bearings and rails but I'm afraid that being used they will not hold up for very long with the speeds I'm shooting for (+1000mm/sec raster). I know I could replace them with some Hiwin 15mm bearing in the future but that would require dismantling the whole machine just to replace the linear bearings.
What I would prefer to use is some bolt on anodized aluminum V rails and metal or delrin wheels. I know they aren't as rigid a true linear rails but there isn't much force on them other than acceleration forces. (Which could be high as I would like to upgrade to NEMA 23 servos in the future.) I was wondering what peoples thoughts on this would be.
Should I design around a true linear bearing setup or should I go with the dual V setup where it is easy to work on and easy to replace parts?
Thanks for any advice
Carl