The Shop > CNC
The basics
spuddevans:
--- Quote from: Will_D on July 22, 2016, 05:10:21 PM ---I'm sure X & Y will be fine but what about Z? (Uses counter weights/gas struts may maker for zero'ish loading on Z
--- End quote ---
I used the same size stepper for all 3 axis', but on the Z-axis I used a timing belt to reduce 2:1, figuring that I wouldn't need the same speed of movement as X or Y, and that the increased resolution and extra torque would be handy. I also got rid of my gas strut as well and it copes fine with no mechanical assistance.
Tim
Imagineering:
I did the same with my Z Axis for the same reason. I rigged up a Sprocket above the Spindle Head and another at the back of the Column. This carries a Bicycle Chain running from the Spindle Head to a 16Kg counterweight at the back.
I'll try to get a Photo tomorrow. Nice & simple, and works perfectly.
Will_D:
--- Quote from: Will_D on July 21, 2016, 06:06:58 PM ---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.
--- End quote ---
An update:
Fitted the 2 thrust bearings and the ordinary bearing and great result - no backlash at the handle end.
There is very little clearance under the tables - so fitting ballscrews maybe a nono!
There is only 32 mm on the Y axis and only 25 or so on the x-axis.
I have read up on the EvaNut and ordered some Delrin bar to have a go!
So just remembered that I have some 20 mm nylon offcuts (Ok Higher Mp but free) so can have a go while ePray and Parcel Motel do their thing
PK:
For low clearance applications, you might consider a spinning nut ballscrew installation. Not as pretty, but it works well and can be easier to keep swarf out of...
John Stevenson:
--- Quote from: Will_D on July 26, 2016, 05:53:24 PM ---
There is very little clearance under the tables - so fitting ballscrews maybe a nono!
There is only 32 mm on the Y axis and only 25 or so on the x-axis.
--- End quote ---
Rubbish, Read up on this thread
http://www.model-engineer.co.uk/forums/postings.asp?th=119249&p=2
Where only tonight I mocked up a SX2P to take ball screws.
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version