Thread: noobie

Page 1 of 2 12 LastLast
  1. #1
    jonm's Avatar
    Location unknown. Last Activity: 19-06-2011 Has been a member for 7-8 years. Has a total post count of 89.
    hi all
    been reading this forum now for a while, picking things up from you guys and i am now ready to start my build which will be a wood router , i have ordered from zapp 3 nema 24 3nm steppers, 2 1200mm long fully supported 16mm round rail 4 open bearings . going to use 12mm trapeziod 3mm pitch for drive , i have a block of derlin from ebay to make nuts , and have made a tap from a piece of trapeziod, slowly gathering parts together, would 2.5 amp drivers be enough or do i need 4 amp, the attachment is a section through the x axis would this work , i would like to make the y axis stiff enough so as to drive the x axis from one side only , any help would be appreciated
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	cnc.bmp 
Views:	94 
Size:	2.48 MB 
ID:	632  

  2. #2
    the SY60 will run from either 3A in unilpolar, 2.1A in series (Bipolar) or 4.2A in Parallel (Bipolar)
    So the answer is yes the motors will run in series with a 2.5A driver, but dont expect to get the machine running very fast, unless you connect in parallele and give it at least 40V.
    I doubt you will be able to run from the center, even with a stiffer machine using profiled rail can crab, and you are using MDF and this will cause you big problems.
    Even running the screw through the center will still casue you problems.


    Quote Originally Posted by jonm View Post
    hi all
    been reading this forum now for a while, picking things up from you guys and i am now ready to start my build which will be a wood router , i have ordered from zapp 3 nema 24 3nm steppers, 2 1200mm long fully supported 16mm round rail 4 open bearings . going to use 12mm trapeziod 3mm pitch for drive , i have a block of derlin from ebay to make nuts , and have made a tap from a piece of trapeziod, slowly gathering parts together, would 2.5 amp drivers be enough or do i need 4 amp, the attachment is a section through the x axis would this work , i would like to make the y axis stiff enough so as to drive the x axis from one side only , any help would be appreciated

  3. #3
    Quote Originally Posted by Gary View Post
    I doubt you will be able to run from the center, even with a stiffer machine using profiled rail can crab, and you are using MDF and this will cause you big problems.
    Even running the screw through the center will still casue you problems.
    Have to agree with Gary here, using open bearings will always cause you crabbing problems which is why I dismissed them for my design, but driving from both sides will soon sort that out.

    Though, I have built up my X axis gantry yesterday on my machine which has a bed size of 1000mm x 600mm and using 20mm THK linear bearings gets virtually no crabbing, I will be driving this machine from the centre. It is a pretty solid all aluminium machine which does help though. will get a clock gauge on it later to measure it but it is not a lot.

    Gary - Don't forget to send me those 16mm ballnuts when they come in, they are the only piece missing now before I can get up and running.

  4. #4
    The ball nuts leave the factory on the 20th so i expect them to arrive mid week (Wednesday / Thursday.)

    Quote Originally Posted by HiltonSteve View Post
    Have to agree with Gary here, using open bearings will always cause you crabbing problems which is why I dismissed them for my design, but driving from both sides will soon sort that out.

    Though, I have built up my X axis gantry yesterday on my machine which has a bed size of 1000mm x 600mm and using 20mm THK linear bearings gets virtually no crabbing, I will be driving this machine from the centre. It is a pretty solid all aluminium machine which does help though. will get a clock gauge on it later to measure it but it is not a lot.

    Gary - Don't forget to send me those 16mm ballnuts when they come in, they are the only piece missing now before I can get up and running.

  5. #5
    Quote Originally Posted by Gary View Post
    The ball nuts leave the factory on the 20th so i expect them to arrive mid week (Wednesday / Thursday.)

    Nice one!

    May be up and running by next weekend then.

  6. #6
    jonm's Avatar
    Location unknown. Last Activity: 19-06-2011 Has been a member for 7-8 years. Has a total post count of 89.
    thanks for the input guys , may bin the mdf idea seen aluminium herehttp://www.aluminium-profile.co.uk/a...10mm_Slot.html

    could get a frame for about 60 ,would it crab with 2 bearings per rail spaced say 200mm , could i run two skate bearings against the outside of the frame on the non driven side to keep it parallel and stop the racking , i have aready ordered the 16mm rails from zapp

  7. #7
    I would still say drive it from both sides, just get another motor and trapazoidal screw and it will be a much better solution. It may cost you a little bit more but at least you know it will be right!

    Just wire both motors to the same driver card, so you won't need to spend more on electronics.

  8. #8
    I dont suggest connecting both motors to the same driver.
    This can cause problems with the driver and will also void the warrantee of the driver.
    As an example of the problems you will see is that if the driver has any anti resonance circuitry this will most likely cause this to not function as expected.
    You will also have issues with BEMF.


    Quote Originally Posted by HiltonSteve View Post
    I would still say drive it from both sides, just get another motor and trapazoidal screw and it will be a much better solution. It may cost you a little bit more but at least you know it will be right!

    Just wire both motors to the same driver card, so you won't need to spend more on electronics.

  9. #9
    jonm's Avatar
    Location unknown. Last Activity: 19-06-2011 Has been a member for 7-8 years. Has a total post count of 89.
    thanks hilton steve
    will gladly take your advice and go for twin screws , i dont want to waste time and money and end up with a machine that
    needs.... well more time and money !! . this, by the way is a great forum for information

  10. #10
    Quote Originally Posted by jonm View Post
    thanks hilton steve
    will gladly take your advice and go for twin screws , i dont want to waste time and money and end up with a machine that
    needs.... well more time and money !! . this, by the way is a great forum for information
    If you go with twin screws, I'd drive them both via belt from a single motor. If you use two motors and slave one to the other and one loses steps you will get racking. If one stalls, you could get a broken machine.

    My 2 penneth'

    Jeff.
    Nothing is foolproof......to a sufficiently talented fool!

Page 1 of 2 12 LastLast

Similar Threads

  1. NEW MEMBER: another noobie
    By wilfy in forum New Member Introductions
    Replies: 0
    Last Post: 17-07-2012, 10:34 PM

Bookmarks

Posting Permissions

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