Simple Machine (help and advice needed)

[njhussey]

You're going to need more than one bearing carriage on each rail. Hard to tell on my phone but Z looks a bit flimsy?

[Ross77]

Yeah as Neil said you will need 2 bearings per rail on the z axis. Also swap the mounting around so the blocks are fixed to the y axis and let the rails move up and down on the Z axis.

The way you have it the strength is always compromised but the other way you can have a stronger z at min travel so you can pack the work piece up if you need a stronger cut. the rails will also add strength to the z plate

[Gregor]

thanks for the advice, I was going to make the z axis out off 10mm steel plate or should it be 19mm aluminium

[Ross77]

Steel would be stronger but heavier and the weight could be a disadvantage.

The best advantage of using Ali would be if you use tooling plate so it is perfectly parallel so mounting the rails and spindle mount would be easier and more accurate.

[Gregor]

Hi
Could someone please explain how you measure ballscrews and what fixing you need to order in order to fix the ballscrew.The ballscrew in the picture is the x axis off the machine and there is an end plate at each end welded to the frame . there is an outer and an inner measurement.
Cheers.

[EddyCurrent]

This is the 'standard machining', if you are going to use pulleys then ask for 'dimension F' to be increased to 30mm, that's what I asked Chai to do and he did it no problem and accurately.

http://www.mycncuk.com/threads/4826-...2863#post32863

BK and BF bearings are the usual choice, dimensions here; http://www.alibaba.com/product-detai...961879637.html

Using that info you should draw it up in CAD to find the exact size you need.

[Gregor]

Thanks EddyCurrent