502,376 active members
6,813 visitors online
Register for free
Login
IndustryArena Forum > CNC Plasma, EDM / Waterjet Machines > General Waterjet > track roller guide system and ballscrew question
Page 1 of 2 12
Results 1 to 12 of 16
  1. #1
    Registered
    Join Date
    Jul 2005
    Posts
    5

    track roller guide system and ballscrew question

    hello all, I am going to build a plasma table, and piecing together what all I need.

    I am planning to make the table 4' x 8'. At this size, linear ball bearing guides become very pricey. I was clicking thru mcmaster's and saw these on page 988 http://www.mcmaster.com/ctlg/loadpag...+Motion+Guides



    would these be sufficient for guides?

    also what diameter ballscrews would I need for 4 x 8 foot to avoid whip?

    i noticed the end mounting blocks for ballscrews are quite expensive as well, is there any cheaper way to get around having to use these?

    thanks
    tom

  2. #2
    Registered
    Join Date
    Dec 2004
    Posts
    518
    Tom,

    Hi! I can't speak for or against the guides you've show-no experience. Given that you are talking a plasma table though they very likely would work-your not really pushing off of a workpiece as with a mill. I'd avoid ballscrews for this as its like overkill for what your doing (due to the plasma kerf). Would they work? Sure! Could you get 100% satisfactory results cheaper? Sure! A great many of the plasma tables-even commercial units-use rack and pinion drive. The gear rack lays along the axis. A spur gear is driven by a motor attached to the moving axis and engages the rack. As the motor turns, the axis runs up and down the rack. The ones I've seen driven by steppers had the motor directly turning the spur gear (wouldn't need to be though). With servos you'd need some intermediate gear reduction for sure. Another option might be belt drive using toothed belts and pulleys. What is it your wanting to plas?

    Lance

  3. #3
    Registered
    Join Date
    Jul 2005
    Posts
    5
    Quote Originally Posted by Evodyne
    Tom,

    Hi! I can't speak for or against the guides you've show-no experience. Given that you are talking a plasma table though they very likely would work-your not really pushing off of a workpiece as with a mill. I'd avoid ballscrews for this as its like overkill for what your doing (due to the plasma kerf). Would they work? Sure! Could you get 100% satisfactory results cheaper? Sure! A great many of the plasma tables-even commercial units-use rack and pinion drive. The gear rack lays along the axis. A spur gear is driven by a motor attached to the moving axis and engages the rack. As the motor turns, the axis runs up and down the rack. The ones I've seen driven by steppers had the motor directly turning the spur gear (wouldn't need to be though). With servos you'd need some intermediate gear reduction for sure. Another option might be belt drive using toothed belts and pulleys. What is it your wanting to plas?

    Lance

    thanks for the info Lance,

    I had decided on ballscrews just in case i wanted to do any wood routing.

    but mainly the purpose of this table will be to make 1/2" stainless and mild steel flanges for turbo manifolds as well as intercooler endtank pieces from 12 gauge aluminum.

    tom

  4. #4
    Registered
    Join Date
    Jul 2005
    Posts
    5
    Quote Originally Posted by Evodyne
    Tom,

    Hi! I can't speak for or against the guides you've show-no experience. Given that you are talking a plasma table though they very likely would work-your not really pushing off of a workpiece as with a mill. I'd avoid ballscrews for this as its like overkill for what your doing (due to the plasma kerf). Would they work? Sure! Could you get 100% satisfactory results cheaper? Sure! A great many of the plasma tables-even commercial units-use rack and pinion drive. The gear rack lays along the axis. A spur gear is driven by a motor attached to the moving axis and engages the rack. As the motor turns, the axis runs up and down the rack. The ones I've seen driven by steppers had the motor directly turning the spur gear (wouldn't need to be though). With servos you'd need some intermediate gear reduction for sure. Another option might be belt drive using toothed belts and pulleys. What is it your wanting to plas?

    Lance
    I am searching for spur gears and gear racks and the longest I can find is 6 '. is it ok to line multiple (like two 4' gear racks) together? what is the common tooth size used?


    thanks

    tom

  5. #5
    Registered
    Join Date
    Dec 2004
    Posts
    518
    Tom,

    Hi again! You certainly can link the sections together. Thinking about it, you need to make sure that the pieces meet at the same point-you might need to gradually remove some material from the end of one piece till the two mating ends match. Then take a spare length, turn it upside down, and place it onto the two sections you are laying together. The teeth will interlock and position the two pieces correctly relative to each other. Then tighten down the bottom pieces and you are on your way.

    As for the tooth size, I can't advise you. I do know there's more to it-there are different angles, pitch angles I believe, involved as well. A little common sense would tell me that teeth too fine wouldn't be appropriate for a 4' x 8' plasma-you want something you can apply a little torque to to get everything moving. But again, I need to defer. I know this has come up before-you might search the site for rack & pinion or gear rack and see what the old posts can tell you. And of course there is our good friend Google. Well, I've had it. I'm signing off and going to bed. Have a good one!

    Lance

  6. #6
    Registered
    Join Date
    Jul 2005
    Posts
    5
    welll I have decided to scale it down to 4' x 4'.

    this should save on cost considerabley I think I am also gonn go with the v-groove style guides as well


  7. #7
    Registered
    Join Date
    Jun 2006
    Posts
    12
    Where did you find a v groove setup like this? its seems perfect for an xaxis

  8. #8
    Registered
    Join Date
    Dec 2005
    Posts
    33
    Is that also from mastercarr? Whats product code or something?

    Also, what would the cost be on that thing?

  9. #9
    LetterCAM.com
    Join Date
    Oct 2005
    Posts
    186
    Did anyone find out where to get a v-groove guide like this from?

    Thanks!
    LetterCAM CNC Software
    http://www.LetterCAM.com

  10. #10
    Registered
    Join Date
    Jul 2006
    Posts
    122
    the v groove roller setup posted is from McMaster-Carr yes. I dont have the number on that unit, but do have a catalog here.

    Ed

  11. #11
    Registered
    Join Date
    Jul 2006
    Posts
    122
    Precision Open V-Groove Track Roller Guide Blocks and Rails

    look on page 1017 of the online catalog...or search for part# 71625K21 and that should get you to the page
    http://www.mcmaster.com/

    Ed

  12. #12

Page 1 of 2 12

Posting Permissions

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