Reduce steel tube diameter by 0.3mm Answered
I am trying to make a DIY CNC machine, using linear rails and the expert advice in the many awesome instructables out there on this topic.
I hit my first roadblock, and I need some help/advice please...
The 16mm steel tubes I ordered for the sliding rails wouldn't fit in the 16mm linear slide bearings SCS16LUU that I ordered, they are ever so slightly too big. With a lot of force I could get the rail in the bearing, but it wouldn't slide without extreme force - certainly not the smooth sliding motion it's supposed to be! I've probably ruined the bearings by forcing it in, but I'm not worried about that so much right now (I have spare bearings).
I broke out the digital callipers, and the rail diameter measured 16.3mm - that's .3mm more than expected, and more than can fit in the 16.0mm bearings.
So now I need to reduce the steel rails by 0.3mm. I have only hand tools at my disposal, and no experience accurately reducing steel rod diameter. I guess another alternative is increasing the slide bearing diameter, but these are sealed bearing units and difficult to get at.
Does anyone have any ideas ? Would it be easier to order new steel?
Please let me know any thoughts on this, I'm desperate here.
Thanks in advance,