Thread: 7' X 4' Combi

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  1. #81
    Quote Originally Posted by Ricardoco View Post
    ive set steps per to 20 Velocity to 3000 accl to 200, Oh im using metric, now when you type in X1000 the gantry travels 1M so that much is correct but im not sure it is the only way to do it the drivers are on the lowest setting which is 200 per rev.
    200mm/s^2 for the acelleration is very low. You should be able to get around 1 to 2 m/s^2.
    The motion will be a lot 'smoother' if you use microstepping. I reckon you'll get around 8m/min, so that's 133mm/s. 200 step/rev is 20 step/mm, so 25000/(133*20)=9.4. So you can have anything up to 9.4 times the number of step/rev ... so try 1/8th microstepping.

    Quote Originally Posted by Ricardoco View Post
    with four people sitting on the gantry it dosnt evn know you are there..
    The overall mass of the gantry doesn't make much difference to the feedrate you can get, it mainly affects the acceleration obtainable (Newton's 2nd law). Increase the acceleration and it will 'notice' plus the people will probably fall off which is an added bonus.
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  2. #82
    Quote Originally Posted by Jonathan View Post
    200mm/s^2 for the acelleration is very low. You should be able to get around 1 to 2 m/s^2.
    The motion will be a lot 'smoother' if you use microstepping. I reckon you'll get around 8m/min, so that's 133mm/s. 200 step/rev is 20 step/mm, so 25000/(133*20)=9.4. So you can have anything up to 9.4 times the number of step/rev ... so try 1/8th microstepping..
    I set the accelleration slow while i was setting things up as i was affraid of missing steps in one of the twin steppers and it all getting out of shape but as you suggest i will speed that up, Ok so how do i set it up to use microstepping then, (I thought i was LOL)



    Quote Originally Posted by Jonathan View Post
    The overall mass of the gantry doesn't make much difference to the feedrate you can get, it mainly affects the acceleration obtainable (Newton's 2nd law). Increase the acceleration and it will 'notice' plus the people will probably fall off which is an added bonus.
    LOL that would be funny, if not for the fact i was one of them...

    Was it good to see your ballnuts working then? and where are these extra points you said i could have.

    Rick
    Last edited by Ricardoco; 18-03-2013 at 10:46 PM.
    Always bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln

  3. #83
    Quote Originally Posted by Ricardoco View Post
    ...... Ok so how do i set it up to use microstepping then, (I thought i was LOL)
    Rick


    Ok i think i have got itLOL

    To get 1/8 microstepping.

    I have 200 full steps per full revolution of motor as it is a 1.8deg motor.
    360degrees (1 full revolution of motor)/200steps=1.8degrees per step
    8 Microsteps per full step (1/8 microstep)
    200x8=1600 steps per rev (1600 set on the driver)
    10mm travel on gantry for 1 revolution of the stepper,
    1600 steps/10mm=160 Microsteps per mm set in "steps per" in motor tuning
    1mm/160microsteps=.00625mm gantry travel per microstep given 1:1 gear ratio motor to screw.

    YES??

    Rick
    Always bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln

  4. #84
    Quote Originally Posted by Ricardoco View Post
    8 Microsteps per full step (1/8 microstep)
    200x8=1600 steps per rev (1600 set on the driver)
    10mm travel on gantry for 1 revolution of the stepper,
    1600 steps/10mm=160 Microsteps per mm set in "steps per" in motor tuning
    1mm/160microsteps=.00625mm gantry travel per microstep given 1:1 gear ratio motor to screw.
    Perfect :)

    Quote Originally Posted by Ricardoco View Post
    where are these extra points you said i could have.
    Click image for larger version. 

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    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  5. #85
    Quote Originally Posted by Ricardoco View Post
    Ok finaly Purchased the Rails for the Y Axis.
    Attachment 8469 Attachment 8470

    Ive got 2x GL20TF + Rails at 1300mm, (when they arrive that is)

    Rick
    Well this just goes to show how fast things can arrive. The rails arrived this morning thats 4 days including the weekend, and this is the second time this has happened with this seller and all the way from Korea. Well hats off to them thats all i can say, they are listed as used on the add and to be fair they are immaculate. Magic

    less than 200 and free postage as well.

    GL20TF+1300mm Used Linear Bearing NB-Nippon Bearing SR20W THK NSK LM Guide CNC | eBay

    Rick
    Always bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln

  6. #86
    Nice one Rick but Jonathan better watch out, somebody has been stealing his designs

    Rotary Nut BLR1616+BLK1616+930mm Used THK Rolled Ball Screw Support BK12+BF12 | eBay
    If the nagging gets really bad......Get a bigger shed:naughty:

  7. #87
    Quote Originally Posted by Swarfing View Post
    Nice one Rick but Jonathan better watch out, somebody has been stealing his designs

    Rotary Nut BLR1616+BLK1616+930mm Used THK Rolled Ball Screw Support BK12+BF12 | eBay
    LOL Naaa Jonathans are better than that and considerably better priced.
    Mind you, if he wants to get some Uni spending money perhaps he should be selling them on Ebay as well..

    Rick
    Always bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln

  8. #88
    Only if he supplies the ballscrew and nut at the same time?
    If the nagging gets really bad......Get a bigger shed:naughty:

  9. Them ebay jobbies look abit shit IMO

  10. #90
    Quote Originally Posted by AdCNC View Post
    Them ebay jobbies look abit shit IMO
    I must say they do. Jonathans are sturdy, well machined and constructed. I just wacked the motors and ballscrews/Nuts on and away..

    Rick
    Always bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln

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