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  1. #1
    Was trying BK 12 Blocks and when tightening the nut it's either too lose and the screw has forward/backward play or it's too tight and the screw can't rotate :(

  2. #2
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Current Activity: Viewing Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 9-10 years. Has a total post count of 2,232. Received thanks 245 times, giving thanks to others 6 times.
    Dismantle the block and check everything is assembled the correct way.

    There is history of these being assembled wrong, which gives the symptoms you've described.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

  3. #3
    Did just that and all i see is just two bearings back to back.

  4. #4
    Clive S's Avatar
    Lives in Marple   Stockport, United Kingdom. Last Activity: 14 Hours Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 6-7 years. Has a total post count of 2,743. Received thanks 494 times, giving thanks to others 43 times. Made a monetary donation to the upkeep of the community. Is a beta tester for Machinists Network features.
    Quote Originally Posted by Fancy View Post
    Did just that and all i see is just two bearings back to back.
    There should be spacers tubes at each end as well.
    ..Clive
    The more you know, The better you know, How little you know

  5. #5
    should i adjust the nut to have minimum drag ? or do i tighten all the way and it should be fine ? if i should tighten all the way then the block is faulty. please clarify this point for me as all my knowledge is theoretical from forums and such.

  6. #6
    Clive S's Avatar
    Lives in Marple   Stockport, United Kingdom. Last Activity: 14 Hours Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 6-7 years. Has a total post count of 2,743. Received thanks 494 times, giving thanks to others 43 times. Made a monetary donation to the upkeep of the community. Is a beta tester for Machinists Network features.
    Quote Originally Posted by Fancy View Post
    should i adjust the nut to have minimum drag ? or do i tighten all the way and it should be fine ? if i should tighten all the way then the block is faulty. please clarify this point for me as all my knowledge is theoretical from forums and such.
    You haven't answered the last statement ie. are there spacer tubes in the block. Also are the bearings AC type or standard ball bearings
    ..Clive
    The more you know, The better you know, How little you know

  7. #7
    I didn't answer because I said in a previous reply that i disassembled them and there are only two bearings inside. I don't know what an AC type bearing is, Would you explain ? Thanks.

  8. #8
    Clive S's Avatar
    Lives in Marple   Stockport, United Kingdom. Last Activity: 14 Hours Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 6-7 years. Has a total post count of 2,743. Received thanks 494 times, giving thanks to others 43 times. Made a monetary donation to the upkeep of the community. Is a beta tester for Machinists Network features.
    Quote Originally Posted by Fancy View Post
    I didn't answer because I said in a previous reply that i disassembled them and there are only two bearings inside. I don't know what an AC type bearing is, Would you explain ? Thanks.
    There should be spacer tubes either side of the bearings.. A picture of the parts would help. Is there a number on the bearing to identify it and is there an oil seal. AC bearings (which they should be) have to be fitted back to back.

    Where did you get them from?
    Last edited by Clive S; 15-01-2019 at 07:15 PM.
    ..Clive
    The more you know, The better you know, How little you know

  9. #9
    Click image for larger version. 

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    The bearings indeed have a writing on them it is 5001Z. I got BK and FK Blocks and neither are working. I got them from a local seller.
    Last edited by Fancy; 16-01-2019 at 12:18 AM.

  10. #10
    Clive S's Avatar
    Lives in Marple   Stockport, United Kingdom. Last Activity: 14 Hours Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 6-7 years. Has a total post count of 2,743. Received thanks 494 times, giving thanks to others 43 times. Made a monetary donation to the upkeep of the community. Is a beta tester for Machinists Network features.
    Quote Originally Posted by Fancy View Post
    Click image for larger version. 

Name:	50519856_287419558640346_5574513872536076288_n.jpg 
Views:	48 
Size:	55.4 KB 
ID:	25331
    The bearings indeed have a writing on them it is 5001Z. I got BK and FK Blocks and neither are working. I got them from a local seller.
    Those are not BK blocks, BK are like this :- https://www.google.com/search?safe=a...V6WUHewkEU1-M:

    AC bearings a bit like these:- https://simplybearings.co.uk/shop/p8...duct_info.html

    5001Z bearings are not good for ball screws you might be able to get the AC type and fit them back to back.

    Your blocks are FK and FF:- https://www.google.com/search?safe=a...8ASwh55BuW4nM:

    Looking at your housing is there a spacer tube in the bearing seal? Look at the picture of the BK block above you can see a spacer at each side
    Last edited by Clive S; 16-01-2019 at 09:02 AM.
    ..Clive
    The more you know, The better you know, How little you know

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