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| Linear Bearings provide any rotation or purely linear? |
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| raynerd:
Hello, I was hoping someone could give me some advice. I`m making a small dividing head and the spindle has a 16mm hardened shaft. It is going to be a really tiny thing for a small machine and I`ve just found out that 16mm is not a standard ID for a ball bearing race!! However, I have found a linear bearing on ebay and not only that, in a housing as well...for the value of the bearing and the materials of the block, it seems great value however would be totally useless if it provides only linear motion and no rotation!! http://www.ebay.co.uk/itm/CNC-Router-SC16UU-linear-ball-bearing-16mm-XYZ-table-/280803647994?pt=LH_DefaultDomain_15&hash=item416133a1fa I don`t know how these work. If they are rollers then I guess it`ll be useless as it`ll only allow the spindle to slide along the bearing which would be useless as I don`t want it to do this....however, if they are ball bearings then it`ll provide rotation as well and I`m guessing it would work OK. Any idea and sorry for the thick questions if there is something I`m missing more obvious! |
| Swarfing:
Chris that will not i'm afraid as it is linear only, you can get 16mm bearings http://simplybearings.co.uk/shop/product_info.php?products_id=2744 But if you go that route then you will not have a shoulder on your spindle. Don't be afraid to have a go at try to use the lathe on that hardened shaft. It will probably only be case hardened and if you tool is sharp and you take it slow with plenty of coolant it will cut |
| 75Plus:
Chris, bearing # 6202/16 is 16mm ID and 35mm OD. X 11mm wide. # 6203/16 is the same ID but a is 40mm OD. and 12mm wide. Both are available on Ebay on this side of the pond. You may find them over there as well. Joe |
| Fergus OMore:
Why ANY sort of bearing? Why use a solid spindle? Well, that is the way that I am interpreting it. Ask the question- how long do plain cast iron bearings last with an unhardened spindle? For instance, the ones that ran in lathes -with motors belting them around. Just the odd daft question( or three). Regards F O'M |
| raynerd:
Sorry F O M but I don`t really understand any of your questions or the point you are making! Chris |
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