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| 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. |
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