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  1. #1
    Ball screws I'm so nave

    As the title suggests what a idiot

    I nearly made a big mistake, I was going to just buy some M12 stainless steel threaded bar 304 grade I think thats right and have it machined to accept the coupling and end and support bearings with a M12 machined block as my ball screw.

    But after doing more research on this forum I found that a purpose built ball screw is the way to go.

    http://www.ebay.co.uk/itm/3-ballscre...7#ht_648wt_905

    I am going to order my ball screw set from the above ebayer as most people on here seem to rate him for price but is the product any good and what is the service like

    With one set of bearings for the x axis for now

    Information and back up from a well supported forum is paramount

    James and Luke :heehee::heehee:

  2. #2
    Going from his feedback and what a few others have said his service certainly seems very good. Ballscrews are the way to go. they will be much better than screwed rod.

    Ian

  3. #3
    Quote Originally Posted by luke11cnc View Post
    I am going to order my ball screw set from the above ebayer as most people on here seem to rate him for price but is the product any good and what is the service like
    I've bought from him on 3 separate occasions - couldn't afford to buy it all at once! It's generally quick to arrive, and generally good products. Make sure you get his supported linear bearings/rails. The 25mm rails are better than the 16mm and 20mm as they have another row of balls. I found there was a bit more play in the 20mm. When you've worked out what you need email him and he will list what you need.

    It looks like you've chosen 20mm ballscrew for the X-axis. The critical speed of 16mm screw, with the bearing blocks he sells, for 1000mm long is about 2000rpm, 20mm screw is 2600rpm, so with 5mm pitch that is 10,000mm/min and 13,000mm/min. Both are probably plenty ... I would either get the RM2005 or RM1610 as the bigger pitch will halve the rpm. I used RM1610 on my Y-axis (750mm long axis) with a 3nm motor and it'll do 12,000mm/min easily. The backlash in his ballscrews is very low.

    (My build log: http://www.mycncuk.com/forums/showth...outer-building...)

    Watch out for customs charges ... he puts a low value on the item so it's not too bad, but you still have the 10 handling fee from Fedex

    Quote Originally Posted by luke11cnc View Post
    With one set of bearings for the x axis for now
    For a 600mm wide gantry you will certainly want two ball-screws to prevent it racking. Or cables in a cross shape like on a drawing board slide ruler to keep both sides moving together.

    Quote Originally Posted by Web Goblin View Post
    Ballscrews are the way to go. they will be much better than screwed rod.
    Yep, using them increased my feedrate on Y-axis by a factor of 2.5 and X-axis by 4. Not entirely comparing like with like there ... but in general they will go much faster due to the higher efficiency.

  4. #4
    I'm confused now could you please paste a link Jonathan R1610

    sorry but I looked at so many my head is now spinning with to much info

    Thank you Jonathan

  5. #5
    Like this one:

    http://www.ebay.co.uk/itm/1-anti-bac...5#ht_561wt_905

    ... but longer and with end-machining.

  6. Quote Originally Posted by Jonathan View Post

    but you still have the 10 handling fee from Fedex
    From my last invoice - DHL administration fee- 1.25 + 20% vat as value stated on invoice - sometimes you may pay custom duties if custom officers fancy it :). What is a justification of charging 10-Fedex if somebody else can handle the parcel for 1.25-DHL ????

  7. #7
    I have sent him a email today on this item
    http://cgi.ebay.co.uk/ws/eBayISAPI.d...7#ht_648wt_905

    what else is needed to complete the x-axis set up is it just the fitting block that bolts to my gantry ??
    bracket http://www.zappautomation.co.uk/mdg1...ing-p-180.html

    James

  8. #8
    I have added a reply but it is being looked at by the mod's why??

    James

  9. #9
    Hi James, i have just approved your post above. I dont know why that happened as you have posted more than enough times, is this the first time you have seen your posts require moderation?

    Thanks,
    Lee
    .Me

  10. #10
    Quote Originally Posted by luke11cnc View Post
    what else is needed to complete the x-axis set up is it just the fitting block that bolts to my gantry ??
    bracket http://www.zappautomation.co.uk/mdg1...ing-p-180.html
    Cheaper:
    http://www.ebay.co.uk/itm/3-ballscre...8#ht_500wt_922

    Or I'll make you them from aluminium for less than that. Here's two I made earlier:

    Click image for larger version. 

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