603,861 active members*
4,541 visitors online*
Register for free
Login
Page 4 of 7 23456
Results 61 to 80 of 141

Hybrid View

Swede Ballscrew Basics 03-01-2005, 05:06 PM
Fred in NC Thanks for your post and... 03-01-2005, 08:58 PM
Fred in NC Specs 03-01-2005, 09:05 PM
Trapper14 Awesome! 03-09-2005, 06:33 AM
Mcgyver that was a great write up,... 03-14-2005, 05:38 PM
TCARPENTER Outstanding article, I really... 03-16-2005, 05:58 PM
Calico This is what I need good... 03-18-2005, 11:01 AM
solarchimesam That was very educational and... 03-17-2005, 03:27 PM
Calico ok, I've read your lecture... 03-27-2005, 02:13 PM
OCNC Look under the 'Resouces' tab... 07-16-2005, 02:47 AM
strat great article appr much... 05-27-2005, 07:43 AM
jimc Swede, That was an... 06-26-2005, 03:15 AM
marchantdice Ballscrew Technology 06-30-2005, 05:47 PM
Pat Swede, Very nice article!!... 07-04-2005, 06:48 PM
Mat-C Thankyou 07-15-2005, 10:36 PM
borgsteam Re: Thankyou 05-20-2019, 05:54 AM
bcox999 wow what a review !!!! ... 06-28-2005, 11:46 AM
jacek.jerzy Go for a ground ballscrew of... 03-30-2008, 12:30 PM
marchantdice We use Kluber Isoflex NBU15.... 07-04-2005, 07:26 PM
daloveshack Ground Precision for Rolled... 08-19-2005, 05:18 PM
Jason Marsha Excellent write-up about ball... 07-17-2005, 05:55 AM
Xterrian Great write up! Any chance... 07-17-2005, 09:23 AM
Mat-C Xterrian: Not sure if... 07-17-2005, 09:39 AM
Xterrian I'm Imperial;) My plan is to... 07-17-2005, 10:29 AM
ESjaavik Or it will increase the... 07-26-2005, 09:08 AM
Jason Marsha Thanks Mat-C, I was curious... 07-19-2005, 12:26 PM
marchantdice A word of warning, before... 07-26-2005, 10:18 AM
ger21 Mach3 can do screw... 08-19-2005, 06:25 PM
DieGuy I just bought one of these... 08-19-2005, 08:54 PM
Bloy2004 What IS that device? 08-20-2005, 12:58 PM
daloveshack I was thinking of something... 08-19-2005, 09:24 PM
DieGuy I think laser displacement... 08-19-2005, 10:40 PM
daloveshack Here's another idea I came up... 08-20-2005, 03:13 AM
DieGuy Is it backlash or screw... 08-20-2005, 03:47 AM
Splint Hi Swede, thanks for such... 09-19-2005, 07:27 AM
NC Cams I'm posting a reply to get... 05-23-2006, 06:59 PM
garagefela Regarding post number 32, is... 05-24-2006, 07:32 AM
thkoutsidthebox Trapezoidal? 03-26-2007, 09:29 PM
marchantdice Trapezoidal is a thread form... 03-26-2007, 09:47 PM
Zumba Trapezoidal is the metric... 03-26-2007, 10:31 PM
marchantdice I think we have a lunguage... 03-26-2007, 10:48 PM
OCNC Are trapezoidal threads... 03-26-2007, 10:56 PM
FPV_GTp wooooooooooooooo very nice... 04-20-2007, 10:21 AM
lgalla I am sure I missed this... 04-21-2007, 06:30 AM
ironDigit Hi there, nice sumup... 07-19-2007, 11:02 PM
toastydeath Ground Acme screws have... 08-11-2007, 05:22 PM
woffler were is a good place to... 12-10-2007, 07:53 PM
woffler any one know the difference... 12-10-2007, 09:07 PM
marchantdice Precision for Rolled... 12-10-2007, 10:25 PM
NC Cams Difference 'tween rolled and... 12-10-2007, 10:03 PM
woffler i foud some ball screws with... 12-12-2007, 02:07 AM
44propmaker NEED HELP WITH ABC's OF SCREWS 01-06-2008, 05:00 AM
marchantdice Screws for a CNC router 01-06-2008, 04:55 PM
44propmaker I think I will be machining... 01-06-2008, 06:44 PM
marchantdice Ballscrew Terminology 01-06-2008, 04:29 PM
jrace2718 can you take the nuts off the... 03-29-2008, 04:07 AM
Tony Mitchell can I take the nut off Yes. ... 10-02-2008, 04:01 PM
jho5820705 Very informative thread. ... 10-08-2008, 01:10 AM
thkoutsidthebox I believe the answer is... 10-12-2008, 12:33 PM
Glacern Driving the nut is nothing... 10-12-2008, 08:52 PM
15mgtar Ok, but I relly need to take... 08-08-2009, 11:56 AM
Mike Everman Make a rod or tube that is a... 08-10-2009, 10:16 PM
NC Cams Can you take the nut off? Yes... 03-29-2008, 11:31 AM
marchantdice (Ballnut, spindle and a few... 03-29-2008, 11:39 AM
ironDigit Offcourse jazek, the... 04-04-2008, 06:54 PM
NC Cams Jwezy is right, that ball... 04-04-2008, 08:44 PM
ironDigit that being said ,i must have... 04-05-2008, 07:42 PM
CNCezee Hi Nice right up on b screws,... 04-16-2008, 08:59 PM
rajuraja123 hello to all 08-16-2008, 10:51 AM
thkoutsidthebox So speaking about... 08-17-2008, 01:17 AM
ironDigit 1 TPI = 1 Turn Per Inch... 08-17-2008, 03:50 PM
FREEFLOW Need help , I recently read... 11-27-2008, 02:27 PM
Meganick Is it normal for preloaded... 12-13-2008, 07:19 PM
FREEFLOW ballscrews 12-13-2008, 08:25 PM
kostas1 1x1.5m Machine...what... 09-18-2009, 11:11 PM
ger21 It's not that simple. How... 09-18-2009, 11:53 PM
phungi Get the 10mm, gear down for... 09-19-2009, 01:00 AM
kostas1 Gerry:thanks for the... 09-19-2009, 07:12 AM
ger21 Use a belt and pulleys to... 09-19-2009, 12:17 PM
Al_The_Man Here is an excellent... 09-24-2009, 07:11 PM
DAVINCHO Thanks a lot, Great... 12-04-2009, 05:48 PM
R!f@@ nice article 06-07-2010, 08:36 AM
kurniawan hallo 07-09-2010, 06:24 PM
headsmess phwoar! i read all that! :) ... 12-30-2010, 01:15 PM
dustin1706 Great write up! Thanks! 01-03-2011, 12:22 AM
beaker152 newbie questions: i note... 05-13-2011, 04:11 PM
louieatienza BIF : Offset preload DIK:... 07-19-2011, 08:09 PM
Bear5k To add on: A couple of the... 07-21-2011, 06:55 PM
louieatienza Yes true... You must do your... 07-21-2011, 08:29 PM
Asmordo If you're not sure if you can... 04-16-2012, 03:46 PM
Zappautomation The C grade is only the lead... 04-16-2012, 05:29 PM
Asmordo Yes, it's true the C grading... 04-17-2012, 02:09 AM
edbeauchamp Hi All, I have some ball... 09-20-2013, 02:03 PM
Varske Re: Ballscrew Basics 07-29-2017, 06:25 AM
loka Re: Ballscrew Basics 04-24-2015, 07:50 PM
toastedsiopao Re: Ballscrew Basics 01-10-2016, 10:37 AM
RCaffin Re: Ballscrew Basics 01-10-2016, 11:04 AM
clarnibass Re: Ballscrew Basics 02-07-2016, 02:24 PM
RCaffin Re: Ballscrew Basics 02-07-2016, 09:24 PM
Jonhale117 Re: Ballscrew Basics 07-11-2018, 12:20 AM
RCaffin Re: Ballscrew Basics 07-11-2018, 06:41 AM
skrubol Re: Ballscrew Basics 07-12-2018, 07:23 PM
men8ifr Re: Ballscrew Basics 10-21-2018, 12:37 PM
RCaffin Re: Ballscrew Basics 10-21-2018, 10:52 PM
Mike Everman I concur! For DIY, for the... 10-22-2018, 03:30 PM
men8ifr Re: Ballscrew Basics 10-22-2018, 03:49 PM
men8ifr Re: Ballscrew Basics 10-22-2018, 03:51 PM
men8ifr Re: Ballscrew Basics 10-22-2018, 07:47 AM
RCaffin Re: Ballscrew Basics 10-22-2018, 08:28 AM
men8ifr Re: Ballscrew Basics 10-22-2018, 01:02 PM
skrubol Re: Ballscrew Basics 10-22-2018, 02:55 PM
men8ifr Re: Ballscrew Basics 10-22-2018, 03:47 PM
RCaffin Re: Ballscrew Basics 10-22-2018, 09:32 PM
borgsteam Re: Ballscrew Basics 05-20-2019, 06:09 AM
Dip1810 Re: Ballscrew Basics 07-01-2019, 09:54 AM
JKAVS Re: Ballscrew Basics 02-01-2021, 08:18 PM
dustin1706 Re: Ballscrew Basics 02-01-2021, 10:35 PM
RCaffin Re: Ballscrew Basics 02-01-2021, 11:32 PM
Stevecjx Re: Ballscrew Basics 03-26-2024, 05:03 AM
rostones Re: Ballscrew Basics 04-03-2024, 08:01 AM
cuixiansheng Re: Ballscrew Basics 04-05-2024, 08:10 AM
aruhi7u Re: Ballscrew Basics 03-01-2025, 05:56 PM
jason003 Re: Ballscrew Basics 03-27-2025, 09:32 AM
lader32 Re: Ballscrew Basics 06-25-2025, 03:36 PM
  1. #1
    Join Date
    Jan 2009
    Posts
    396
    Quote Originally Posted by Tony Mitchell View Post
    can I take the nut off Yes.

    Do all the bearings just fall out? Yes, they do.

    Can I get them back in or do I take pains to not let the nut get unscrewed all the way in the first place? It's not easy to to put the balls back in. I've made a lot of money over the years by people thinking they can just put the balls back in, and tadaaaa! It's best that you try NOT to take the nut off of the screw. You will save time, money and aggravation.

    Can I set the backlash myself or is it set at the factory by the size balls, etc? Is it a split nut (double nut)? If yes, you can set your own backlash. If it's a single nut, no you cannot.

    If you are experiencing excessive backlash, it's a most likely it's a worn ball screw and needs to be re-balled or repaired.

    What is the diameter & length? Is it a precision ground or rolled thread ball screw? Can you provide photos of the nut? There may be an adjustment on it.
    Ok, but I relly need to take the nut off in order to machine it. Can someone show me how to take it off correctly?

  2. #2
    Quote Originally Posted by 15mgtar View Post
    Ok, but I relly need to take the nut off in order to machine it. Can someone show me how to take it off correctly?
    Make a rod or tube that is a bit smaller in diameter than the minor diameter of the ballscrew grooves, and longer than the nut. You can then run the nut off the end and on to the rod.
    If the end of the screw is machined, then you need this to be a tube so the tube can go right up to the end of the threads.

    The rod/tube will keep the balls where they should be and as long as you don't let that come out, you'll be fine. I usually put a zip tie on each end so bumping it doesn't get you in trouble.

  3. #3
    Join Date
    Apr 2009
    Posts
    220
    Ok, understood...
    So the best way to make it from the beginning is to use this pulley?
    What if I firstly connected the motor directly to ballscrew and some other day decided to also put a pulley?Will it be feasible or I had to change the machine's design?

    Thanks and sorry but I am a beginner...
    Kostas.

  4. #4
    Join Date
    Dec 2005
    Posts
    3319
    Can you take the nut off? Yes Would you want to? Hardly.

    The replacement of the balls can be an exercise in futility as it is a PIA to do. Granted, it can be done and once you do it, the next time is easier. BUT the process is time consuming and not one that works well with SWAG or helter skelter processes. There are better and more productive things to do with your time.

    The raceways that the balls travel thru are not simply curved radii like a gutter at a bowling alley. Rather they are a form of a gothic arch. This causes the balls to make 4 point contact - 2 points in the nut, two in the screw. Essentially, the balls make contact at points roughtly 45 degs off of vertical up and down on the nut and screw.

    To adjust backlash, simply put in larger or smaller balls. BUT you only should change balls in 0.0001" increments. Hence, it is often a hit miss process of fitting severa size balls to get what you want for backlash. SInce you are working in tenths changes in ball diameter, the trick is to find a source of various diameter balls this accurate when/if you sit down to reset backlash in a ball screw/ball nut.

    I used to source balls of this accuracy from Winstead Precision ball. Whether or not they have what you need or will still sell in small quantities is the problem. And, you have to buy HUNDREDS if not thousands of balls at a time - the Graingers and M-C's of the world dont' typically specialize in balls of this quantity, size differential and/or accuracy. Regarding accuracy, you want to get Grade 5 balls - there is a noticable difference 'tween 5's and anything less accurate.

    Explanation: picture a go cart running on 4 different sized tires. It is easy to see how the tires would be unequally loaded. Same deal when you use Grade 5's versus 10's, 25's or even 100's to try to roll evenly and smoothly thru the ball path where you are essentially operating with metal to metal contact and ZERO radial/axial clearance. All of a sudden if larger or smaller balls come into play, things get noticeably harder or easier to turn.

    Resettnig clearance in ball screws is NOT a hit or miss deal. Throwing a half thou SWAG change in ball size could result in locking the nut onto the screw and, worse yet, brinnelling the pall path. Once you brinnel the ball path, the screw is junk as you'll always have brinnell dents at that point and the screw will ALWAYS turn rough and sloppy at the damaged point.

    Find a ball screw repair house and have them do it. It is not that expensive. In my case I know how to do it, know where to get EVERYTHING yet I still pay to have it done. That should say something about the process.

  5. #5
    (Ballnut, spindle and a few balls on the floor - what can go wrong?)
    Ballnuts can be removed by the end use however as a ballscrew manufacturer we would not reccomend this as rebuilding can cause issues......

    So remove the ballnut from the spindle and most of the balls will fall out.

    Replacing the original balls, this is easily done using a mandrel (a tube machined to the same diameter as the spindle root diameter) insert the tube into the bottom of the ballnut, fill the first circuit advancing the mandrel as you go. 2nd, 3rd circuit etc etc.
    Next place the spindle horizontal in a machine vice (use 2 peices of wood to protect the spindle) placing the start of the spindle thread in the 12 o'clock position. Carefully look in side the ballnut for the start of the first circuit and mark the position on the out side of the ballnut.
    Slide the mandrel and ballnut over the end machining with the ballnut in the 12 o'clock position rotate the ballnut in a clockwise direction and the nut will advance down the spindle (like a nut and bolt) If the ballnut sticks, lightly tap the nut body.

    You only learn by making a mistake......

    Preloading, leave this to the manufacturers or a rebuild service.

  6. #6
    Join Date
    Oct 2005
    Posts
    278
    Offcourse jazek, the manufacturer will use the same g-codes.
    Though i'm sure that there will be a difference in the machining proces in regards of how many times the grindingstone will be dressed and how many cycles he will run it.Cycles meaning a tolerance check and regrinding when necessary.
    I also can't see what would stop a manufacturer to put the 10 by "accidentally" C1 grade screws on stock and getting to charge some one that orders c1 much more for the same screws whilst just manufacturing you 10 different c5 screws.

    I'ld like to hear what nccam has to say about this subject.
    Finally CHIPS you can have as much as you can without the doc. complainting about your cholesterol.

  7. #7
    Join Date
    Dec 2005
    Posts
    3319
    Jwezy is right, that ball screw plant is pretty much geared to make one product accuracy grade. Hence, you can PROBABLY get away with the lowest accuracy part although you'll PROBABLY be getting high accuracy. SOMETIMES, the ONLY difference is the certification papers.

    I know of an instance where the highpoint of eccentricity markings on a bearing were essendially phony. The bearings had NO perciptible or even measureable eccentricity BUT the market was so accustumed to seeing high point, markings, they put them on even though there was none.

    Ditto that for this particular plant's ABEC ratings. The bearings were all ABEC 7 (ISO P4) or better, yet the bearings were packaged and priced to the order requirements that were made. Yes, ABEC 7's were packaged as 7's, 5's and even 3's, and priced pursuant to the market price for the corresponding grade of bearing.

    Caveat: not all bearing companies do that sort of deal so you you CAN'T take this as a blanket claim.

    Regardless of the application, the more accuracy you scrimp and save for and build into your machine, the better it will run/finish. In other words, buy the best you can't afford and you woun't be disappointed. Nobody I know of was ever disappointed from buying something better than they needed.

  8. #8
    Join Date
    Oct 2005
    Posts
    278
    that being said ,i must have completely misunderstood the manufacturing process of these beautiful tools referred to as ballscrews.I'll study more.

    I guess one should keep track of wich manufacturer was the las tto upgrade their production machinery since they'll pro bably have most high-grade overstock.

    my earlier response was stooled on the idea that flat and especially form/thread grinding requires frequent tolerance checks and adjustment for the wear of the grindingstone.
    So i assumed a manufacturer will put more effort into the checking and adjusting of the higher then the lower grade screws.
    '
    The last i would like to state is that i think the "lower grade"precision ballscrews are way-deluxe for a hobbyist so you almost can't miss when acquiring screws that are in good condition.
    Finally CHIPS you can have as much as you can without the doc. complainting about your cholesterol.

  9. #9
    Join Date
    Sep 2005
    Posts
    52
    Hi Nice right up on b screws, but i have a question,
    How do i calculate what torque i need to lift a given weight over a given distance with a Bscrew ( ground ) 5 tpi.

    Any one help?

  10. #10
    Join Date
    Mar 2008
    Posts
    5
    hello to all

  11. #11
    So speaking about starts......

    If I have a single start screw, we'll say 1 TPI, rotating at 600rpm ..... it will travel 600ipm.

    Now if I have a 4 start, same screw details....1 TPI, same speed, will it travel 2400ipm ?

    and slightly off topic:

    Will I need a stepper with 4 times the torque to turn it?

  12. #12
    Join Date
    Oct 2005
    Posts
    278
    1 TPI = 1 Turn Per Inch meaning that for every whole turn nut will be displaced 1inch so ,a 20start 1TPI screw will displace 1inch per turn

    Sorry but i can't hel with the torque needs so when i have to pikk i just make sure i overkill .
    Finally CHIPS you can have as much as you can without the doc. complainting about your cholesterol.

  13. #13
    Join Date
    Nov 2008
    Posts
    2
    Need help , I recently read an article on replacing the ball bearings . so I thought I would do it to refresh mine , after a close look found the bearing were out of round , replaced them and now cannot get them to stay in after being replaced , this is a dual barrel ballscrew , am I doing something wrong , I did not loose any parts , any help is appreciated.
    Freeflow

  14. #14
    Join Date
    Jun 2006
    Posts
    15
    Is it normal for preloaded rolled ball screws to feel "gritty" or bumpy as they are turned manually?

    I am running Thompson Ball Nut 7820827 and Ball Screw 5707540 (Reid Supply TBS-412TBS-20) with wave washer preload 50-100lb on a RF-30 conversion. The position of the bumps are repeatable to some degree - if the nut is rotated slightly and then returned to the position of the bump. If I give the nut a bit spin and return to the original position of the bump, the size of the bump changes or disappears. Could this have something to do with balls entering or exiting the return tube? or just lining up differently? This is happening on all three axis. Cleaning and lubing each assembly did not help. I am going to try replacing (eBay) the ball bearings next. Any ideas what causes this or fixes?

    -Nick

  15. #15
    Join Date
    Nov 2008
    Posts
    2

    ballscrews

    I finally looked real close and found that all the balls are 2 and 1/2 thousanths differant in size , alternate loading untill the canister will not hold any more balls , this took care of the problem for me , I am yet to test for losing steps though , will comment after the test run ,
    Regards
    freeflow

  16. #16
    Join Date
    Apr 2009
    Posts
    220

    1x1.5m Machine...what Ballscrews?

    Hi Swede,
    It was nice article..I learned a lot and I have some questions about my machine which I started to build...I already have 3 640 oz-in Keling motors,3 Geckos 203V, 1 KL-6515 power supply and the C11 board...(waiting for the chinese spindle of 2.2kW)

    What I would like to know now is what ballscrew to use?My machine will be 1x1.5m and I 'll mostly cut wood and some cuts of aluminium...I want it to be a bit fast and wonder if 5mm pitch is the right one or should I go to 10mm pitch?If my max motor RPM is 1200, then with the 5mm pitch I'll have 236.22 IPM right? Doubling it to 10mm I ll have 472.44IPM...

    What would you suggest to do?I am quite confused and don't want to waste money..

    Thanks in advance...
    Kostas.

  17. #17
    Join Date
    Mar 2003
    Posts
    35494
    Quote Originally Posted by kostas1 View Post
    If my max motor RPM is 1200, then with the 5mm pitch I'll have 236.22 IPM right? Doubling it to 10mm I ll have 472.44IPM...
    It's not that simple. How much torque will you have at 1200rpm? If you want to move at 472ipm, you'll need enough force to accelerate up to that speed. If using Mach3, acceleration is linear, so you'll need the same force at 450ipm as you do at 20ipm, during acceleration. But the torque drops off as rpm's increase.

    My guess would be to go for the 10mm lead.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

  18. #18
    Join Date
    Jul 2007
    Posts
    34
    Get the 10mm, gear down for 5mm resolution if needed.

  19. #19
    Join Date
    Apr 2009
    Posts
    220
    Gerry:thanks for the answer...I don't want to move at 472IPM...I'll be very satisfied with 300IPM also.We talk about rapid speed now and 472IPM is the theoretic speed given the motors' power and ballscrew pitch...

    Phungi:thanks...What do you mean by this?
    Get the 10mm, gear down for 5mm resolution if needed.
    How could I gear down to 5mm if I already bought 10mm?

    Thanks..

  20. #20
    Join Date
    Mar 2003
    Posts
    35494
    Quote Originally Posted by kostas1 View Post

    Phungi:thanks...What do you mean by this?


    How could I gear down to 5mm if I already bought 10mm?

    Thanks..
    Use a belt and pulleys to connect it to the motor. If you need more power, put a smaller pulley on the motor. If you need more speed, put a smaller pulley on the screw.
    Gerry

    UCCNC 2017 Screenset
    http://www.thecncwoodworker.com/2017.html

    Mach3 2010 Screenset
    http://www.thecncwoodworker.com/2010.html

    JointCAM - CNC Dovetails & Box Joints
    http://www.g-forcecnc.com/jointcam.html

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

Page 4 of 7 23456

Similar Threads

  1. The basics
    By SpacedCowboy in forum Community Club House
    Replies: 0
    Last Post: 01-23-2012, 08:05 PM
  2. Replies: 10
    Last Post: 01-16-2007, 06:27 PM
  3. The basics
    By Netjams in forum Community Club House
    Replies: 2
    Last Post: 04-10-2006, 09:01 PM
  4. The Basics Please -- Help!!!!
    By Starwoes in forum CNC (Mill / Lathe) Control Software (NC)
    Replies: 3
    Last Post: 09-08-2005, 05:25 PM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •