Build Thread- CNCDevil´s one by one

[CNCDevil]

Hi fnm

I'm kind of sorry to say that I didn't try to make the blocks. I got a cheap offer on some pro. blocks, so I have bought four of these instead.

But...

I wrote back and forth with a guy who is a bearing engineer and he told me that the idea had some potentional, but that it would never be an high-end solution, as the actual force applied to the bearings was a little hard to determin. I was kind of aware of this from the beginning, but I'm still willing to give it a try later on, with another machine. I'm pretty sure that it will work for alot of homemade machines, but now I just want to push on to finish this machine, as there numerous of other factors to be concerned about. I really do not have that much of spare time, so this kind of "project" must wait, until I have more time. I'm already far behind my schedule.

I would like to see your solution.

Brian

[fnm]

Originally Posted by CNCDevil Hi fnm I would like to see your solution. Brian

Hi Brian,
I have been reading as much as possible about bearing preloading during these past days and I realized its very complicated. Really preloading with a constant force looks very simple... but the fitting forces between shaft and inner bearing ring distorts the preloading and maybe this can be an issue difficult to avoid. In spite of this I made up my mind to implement your idea and check what happens .... but yesterday I saw a very simple solution and not expensive while I was searching INA web. They have a bearing -model ZKLR1035- for leadscrews, with flange mounting and its price is "only" 22€. It is preloaded and very simple for mounting and has an axial rigidity of 26N/umm, which assuming 100-200N axial cutting forces gives displacements of 4-8 umm..... so I choose this simple solution.
Here is a drawing of my preloading with 2x 7200 B
Good luck with your project¡
-Francesc

[fnm]

Originally Posted by fnm Hi Brian, .... but yesterday I saw a very simple solution and not expensive while I was searching INA web. They have a bearing -model ZKLR1035- for leadscrews, with flange mounting and its price is "only" 22€. It is preloaded and very simple for mounting and has an axial rigidity of 26N/umm, which assuming 100-200N axial cutting forces gives displacements of 4-8 umm..... so I choose this simple solution. -Francesc

Sorry to inform you that my last paragraph is not true..... Today Ina dealer called me and told me the right price for ZKLR1035 is 63€ instead of 22€.... and displacement for a 200 N axial force is about 89 um.... so I come back to our idea to use 2 7200B . We'll see what happens...

[CNCDevil]

Your idea seems to be good. I'll look forward to see it come alive :-) I'm Almost sure it will work.