Thread: Timing Belts

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  1. #1
    Ive looked around the forum but still cannot see an answer so here goes, Is there somewhere I can get a T5 x 10mm x 1645mm Continuos belt from.

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

  2. #2
    have you had a look at beltingonline.com, they might?

  3. #3
    Quote Originally Posted by mocha View Post
    have you had a look at beltingonline.com, they might?
    They do do one you join, but this is to syncronise two trapezoidal lead screws to save slaving steppers and it states they are for low load only, so i'm a little unsure of them..

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

  4. #4
    Ok Ive got the task of connecting two Leadscrews that are 760mm apart center to center so they can be driven by 1 stepper. Does anyone know a simple way??? possibly using a Timing belt please state belt & and pulley sizes and source if timing belt is the way to go...
    Always bear in mind that your own resolution to succeed is more important than any other - Abe Lincoln

  5. #5
    Quote Originally Posted by Ricardoco View Post
    Timing belt please state belt & and pulley sizes and source if timing belt is the way to go...
    Timing belt is the only type of belt to use here since it is critical that they remain synchronised. Various ways:

    1) Short belt from motor to one leadscrew, long belt linking them with idler to tension it.
    2) Long belt linking screws, wrap this belt round the motor pulley with idlers - so 3 pulleys on the one belt.
    3) Two belts of a similar length going to motor placed in the middle, will make a 'V shape' so you can move motor to tension.

    If you go for 1) then this 1595mm belt with 15T pulleys is 760mm center distance (or 1690mm with 34T pulleys is better as more teeth engaged on the pulleys), but that might be a bit risky when it comes to tensioning as if the center distance is slightly more, or the belt is slightly too short (possible due to the manufacturing tolerances) then the belt will not fit or may be damaged. It's safer to get a bigger belt then use an idler to tension it, problem is the next belt length up us 1690mm and the nearest with that over 760mm is 765mm which is too long.
    If you go for 2 or 3 there's plenty of options.

    Do you consider it critical to avoid slaving the steppers?
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

  6. #6
    Quote Originally Posted by Jonathan View Post
    Timing belt is the only type of belt to use here since it is critical that they remain synchronised. Various ways:

    1) Short belt from motor to one leadscrew, long belt linking them with idler to tension it.
    2) Long belt linking screws, wrap this belt round the motor pulley with idlers - so 3 pulleys on the one belt.
    3) Two belts of a similar length going to motor placed in the middle, will make a 'V shape' so you can move motor to tension.

    If you go for 1) then this 1595mm belt with 15T pulleys is 760mm center distance (or 1690mm with 34T pulleys is better as more teeth engaged on the pulleys), but that might be a bit risky when it comes to tensioning as if the center distance is slightly more, or the belt is slightly too short (possible due to the manufacturing tolerances) then the belt will not fit or may be damaged. It's safer to get a bigger belt then use an idler to tension it, problem is the next belt length up us 1690mm and the nearest with that over 760mm is 765mm which is too long.
    If you go for 2 or 3 there's plenty of options.

    Do you consider it critical to avoid slaving the steppers?
    Evening Jonathan, thanks for the reply, I can drive 1 screw directly with stepper and pulley from one screw to other with pulley, i dont have a choice about the slaving. so option 1, and i will drive 1 screw directly with stepper.. Magic Thanks.

    I do have lateral screw adjustment from 755mm to 765mm center to center so fingers crossed manufacturing tolerences should not be a problem..

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

  7. #7
    You can have belts made to any length you want, that what I did with mine. I use a local bearing company so try your nearest decent bearing place.

    Regards the belt design and heres one way using 2 idlers on plate that with adjustment for motor. All same size pulleys for 1:1 on my machine I go 2:1 with 5mm pitch screws using 24T on screws 48T on motor but you can use any size pulleys that suits. 15mm wide belts for me.

    Edit: My machine doesn't use this system it use's short belt from motor to screw then long belt between screws. This is because my screws are 1300mm centres so suits it better.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by JAZZCNC; 30-07-2012 at 12:05 AM.

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  9. #8
    I will PM you about those as i cant use them on this project, but i can on another that im having some bits made for on pay day Ive just got to send the drawings off..

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

  10. Quote Originally Posted by JAZZCNC View Post

    Edit: My machine doesn't use this system it use's short belt from motor to screw then long belt between screws. This is because my screws are 1300mm centres so suits it better.
    Images of Jazz's set up - link below (posted when I was asking a similar question!)

    http://www.mycncuk.com/forums/showth...xis-CNC-router

  11. #10
    Quote Originally Posted by JAZZCNC View Post
    using 24T on screws 48T on motor but you can use any size pulleys that suits.
    Within reason - using too small pulleys can stress the belt too much or risk leaving not enough belt teeth engaged with the pulley. I avoid using less than 15T pulleys for this reason.i
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

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