The Shop > CNC
The basics
Manxmodder:
--- Quote from: Will_D on July 27, 2016, 08:51:57 AM ---
--- Quote from: John Stevenson on July 26, 2016, 06:13:34 PM ---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.
--- End quote ---
Many thanks John for this link. What a co-incidence!
I will try the Delrin EvaNuts first and see how that goes. I may well do a few mods to the X2 and the ball screws.
I see you used 1605s would you recommend these over 1204s?
--- End quote ---
Will, I seem to remember there being debate on that forum about making the Evanuts from 'Delrin' which is Acetal homo-polymer.
There was discussion about the varying sectional density of Acetal homo-polymer bar causing a less reliable result than using the Acetal copolymer.
I used Acetal copolymer for mine,but I believe some of the ones seen being made in various videos may be using 'Delrin'
Do it in a well ventilated area,whichever plastic you use.....OZ
John Stevenson:
--- Quote from: Imagineering on July 27, 2016, 05:19:35 AM ---Counterweight System for my SX3 CNC Conversion as promised.
--- End quote ---
Why a counterweight ?
Done over fourty X3's and SX3's and none needed counterweights and any that had a gas strut fitted it got removed.
350 oz/in motor at 2:1 reduction on 5mm pitch screws
Will_D:
No great progress on the Eva nuts but a 500mm by 12 ball screw arrived by slow boat.
Am making progress in fitting a VFD motor and controller to the old girl (Myford ML7!!)
Now the nut is fitted to the shaft and I recall somewhere NOT to take it off the shaft less the balls fall out!
Can someone please explain a bit more as to how to safely remove the nut so I can machine the ends?
As a laugh at bede-time I love this comment from the Rio Equestrian commentator on Irish TV:
"Her ears are pricked back, so she's ready for riding!"
mattinker:
Although I've never done it, instinct tells me not to take the nuts off, but to fix them in place whilst machining! Some kind of split tube that bolts together with "U" bolts or something. Or maybe just "gaffer" tape? Anything but have to play with all those escape prone balls!
Good luck, Matthew.
PekkaNF:
Can you butt to ballscrew a plastic pipe that OD is thread ID and screw the ballscrew onto this plastic pipe?
The way we have used is:
1) to make sure this pallscrew is filled proper grease - grease will retain the balls.
2) use plastic pipe to substitute ballscrew, you will fumble at one point...
Assembly in reverse order. Plastic pipe OD should be "snug" fit into the ball screw and ID should slip over the future spigot.
Pekka
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