Thread: Aluminium CNC log.
Looks good, except for one thing. You have put the rails for the Z-axis on the Y carriage. It's much stronger if you have the bearing blocks for the Z-axis on that carriage (in addition to the bearings for Y). I mentioned it in post #23 and #60. Although having said that with the way you've orientated it it wont make too much difference.
If you don't mind me asking, how much did it cost to get those bits cut?
What Steepers are you using? Shielded CY or SY wire is my best suggestion, as it really helps with reducing signal noise along the wiring.
Mounting the rails behind the spindle plate in my Eyes isn't correct.
I don't know why it would be stronger and on our scale machines it may make no difference at all but I just prefer it that way.
I know this drawing is unfair but I'm provin a point here.
Also, Once apon a time, my college used to be the place people went for engineering apprentiships, While all the CNCs and most of the lathes are gone now. I managed to find about 40 brand new end mill bits in the sizes 6mm and 4mm. These fit perfectly into my Spindle and my tutors said i could have them :)
And I'm going to buy a reel of single core wire between 1mm^2 and just use it for everything. I would go multicore for the steppers and drivers but I don't need a reel of it costing nearly £100 from Farnell and don't know where else to get cable.
The reason why is most people start by mounting them like this:
So clearly there there is a large overhang = weak.
However you've mounted it like this:
Which is better than the previous, as at the bottom of the travel (where you'll use it most for thin materials i.e. cutting aluminium for which it is the most rigid). However further up you're relying on er... the spindle for rigidity instead of with the configuration I suggest the aluminium plate and rails.
EDIT: Actually the second diagram is just the same as the first except instead of using aluminium plate to hold the spindle you're relying on the strength of the spindle itself.
Chip did it like in the first drawing and unfortunately found out the hard way when he tried to cut aluminium. I started by drawing the same on my Z-axis (400mm travel), but fortunately someone pointed it out so I changed it.
Last edited by Jonathan; 10-01-2012 at 07:28 PM.
http://www.csecables.com/control-cab...trol-cable.asp buy just what you need.
Edit: Better link http://www.csecables.com/acatalog/Fl...rol-Cable.html
The rails mounted on the front plate make a big difference when it come to reducing chatter.!
Last edited by JAZZCNC; 10-01-2012 at 07:45 PM.
Let me know how much you need as I'm happy to sell some of mine.
It's about 120 grams per meter, so can probably get 8m in 1kg for £3.15 2nd class. Or standard parcels is £4.41 for 2kg ... parcels2go probably less as they keep spamming me with emails about how cheap they are.
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