The Shop > CNC
The basics
SwarfnStuff:
Thanks Manx,
Yup, that was it. Strange how one finds such a thread, bookmarks it then looses the thing by some mysterious computer gremlin. :scratch:
In my case I think it was my junk removal software being a tad too efficient - like, all bookmarks disappeared as it seems to have been treated as a, "temp" file location.
John B
Manxmodder:
Where many seem to go wrong with producing a successful 'Evanut' is they omit the final stage of putting it in the freezer to shrink the acetal co-polymer and using an end portion of the threaded rod as a thread relieving tap.
By not doing this action they end up with a nut that is far too tight to be functional in many cases......OZ.
Will_D:
So after googling up some ball screws they seem well priced from China.
SFU 1204 seem they way to go, Tolerance is C7, and 12 as in 12mm od and 04 as in 4 mm pitch I assume??
Now what about the handle end. As already mention my SX2P has a fair amount of backlash at the handle (no thrust bearings). I posted a potential fix (http://madmodder.net/index.php/topic,10428.msg118625.html#msg118625)based on the ARC Myford cross-slide fix. If I just fit a stepper motor at the other end will this remove the backlash?
Also do I need to use those "bellows" type flexible couplings 'tween stepper and feed screw?
I already have 5 micron DROs fitted, can these be used as feedback for a CNC stepper controller?
John Stevenson:
--- Quote from: Will_D on July 21, 2016, 06:06:58 PM ---So after googling up some ball screws they seem well priced from China.
SFU 1204 seem they way to go, Tolerance is C7, and 12 as in 12mm od and 04 as in 4 mm pitch I assume??
Now what about the handle end. As already mention my SX2P has a fair amount of backlash at the handle (no thrust bearings). I posted a potential fix (http://madmodder.net/index.php/topic,10428.msg118625.html#msg118625)based on the ARC Myford cross-slide fix. If I just fit a stepper motor at the other end will this remove the backlash?
Also do I need to use those "bellows" type flexible couplings 'tween stepper and feed screw?
I already have 5 micron DROs fitted, can these be used as feedback for a CNC stepper controller?
--- End quote ---
Correct 12mm diameter [ nominal ] and 4mm pitch
For the handle end you want a pair of angular contact bearings mounted back to back.
For couplings use Oldham couplings, they are backlash free and the only type f coupling that can handle mis-ailgnment in two planes without binding.
This is how I like to mount motors.
Inside that block are the two bearings and the nut that retains them is the first half of the Oldham couplings. Don't mount the motor on pillars like many do, it's a machine tool not a bloody clock.
No you can't use your scales, none of the hobby controllers like Mach can accept feedback.
Brass_Machine:
--- Quote from: John Stevenson on July 21, 2016, 06:28:41 PM ---
Inside that block are the two bearings and the nut that retains them is the first half of the Oldham couplings. Don't mount the motor on pillars like many do, it's a machine tool not a bloody clock.
No you can't use your scales, none of the hobby controllers like Mach can accept feedback.
--- End quote ---
John... I am trying to picture how that is setup in mind. Having difficulty seeing it (my mind is already full). Can you describe a little more?
Eric
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