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  1. #1
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    BT30 spindle belt is terribly loud.

    Hi,
    I'm using T5 belt and pulley to drive my BT30 spindle. That belt is very loud over 1000RPM.

    So I want to change but what is the best timing belt for max 6000RPM? Any thoughts on 5M belt?


  2. #2
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    Re: BT30 spindle belt is terribly loud.

    Quote Originally Posted by Azalin View Post
    Hi,
    I'm using T5 belt and pulley to drive my BT30 spindle. That belt is very loud over 1000RPM.

    So I want to change but what is the best timing belt for max 6000RPM? Any thoughts on 5M belt?

    Any Trapezoidal tooth Timing Belts will all be noisy

    Here is what all the Timing Belts are and which is best, GT2 or GT3 is improved version of the GT2, is by far the best Timing Belts on the market, if you are not doing rigid tapping then you should be using a Poly-V-Belt around 10 or 12 groove J type would be best, a poly-V-Belt can be used for rigid tapping, if it is correctly tensioned and not over loaded, a Poly-V Belt is almost silent.
    Mactec54

  3. #3
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    Re: BT30 spindle belt is terribly loud.

    Well, spindle motor is an AC servo but honestly I don't think I'll ever do rigid tapping.

    I'll take your advice and switch to poly-v belt.

    Thanks Mactec54.

  4. #4
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    Re: BT30 spindle belt is terribly loud.

    Quote Originally Posted by Azalin View Post
    Well, spindle motor is an AC servo but honestly I don't think I'll ever do rigid tapping.

    I'll take your advice and switch to poly-v belt.

    Thanks Mactec54.
    What is the Hp of the motor ???

    You can do thread mill if you wanted to without any problems. A lot of builders make this mistake, by using Timing Belts, when they have no need for them, I always use the Poly-V-Belt for spindle builds.

    Here is one I did recently, this is 2:1 10 Rib J series and has a 3 Hp motor driving it, You can make your own Pulleys.
    Attached Thumbnails Attached Thumbnails Spindle Motor and Drive-5.jpg  
    Mactec54

  5. #5
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    Re: BT30 spindle belt is terribly loud.

    Motor is 1.3kw, according to google that is equal to 1.74hp

  6. #6
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    Re: BT30 spindle belt is terribly loud.

    Quote Originally Posted by Azalin View Post
    Motor is 1.3kw, according to google that is equal to 1.74hp
    Yes that is about right for 1.3Kw.

    Did you have it 1:1 or have it geared up to get the 6,000 RPM.
    Mactec54

  7. #7
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    Re: BT30 spindle belt is terribly loud.

    1:1 pulleys

    Sent from my MI 5s Plus using Tapatalk

  8. #8
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    Re: BT30 spindle belt is terribly loud.

    Quote Originally Posted by mactec54 View Post
    What is the Hp of the motor ???
    You can do thread mill if you wanted to without any problems. A lot of builders make this mistake, by using Timing Belts, when they have no need for them, I always use the Poly-V-Belt for spindle builds.
    Here is one I did recently, this is 2:1 10 Rib J series and has a 3 Hp motor driving it, You can make your own Pulleys.
    Nice job.
    I can only get a poxy 4 rib J series on mine so can't go too mad with power.
    If I can claw back some money from the machine build. I'll be looking into constructing a whole new head piece for it to house a BT30 spindle and bring the spindle center forward a little to gain more throat depth upto 205mm which atm is 185mm.
    The Y axis travel itself is already extended to 203mm from 180mm when the conversion was done
    (PM25 type machine)

  9. #9
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    Re: BT30 spindle belt is terribly loud.

    Quote Originally Posted by dazp1976 View Post
    Nice job.
    I can only get a poxy 4 rib J series on mine so can't go too mad with power.
    If I can claw back some money from the machine build. I'll be looking into constructing a whole new head piece for it to house a BT30 spindle and bring the spindle center forward a little to gain more throat depth upto 205mm which atm is 185mm.
    The Y axis travel itself is already extended to 203mm from 180mm when the conversion was done
    (PM25 type machine)
    Depends on the Hp of the motor and if there is a ratio involved J-4 Rib would not have a very high Hp rating
    Mactec54

  10. #10
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    Re: BT30 spindle belt is terribly loud.

    Quote Originally Posted by Azalin View Post
    1:1 pulleys

    Sent from my MI 5s Plus using Tapatalk
    Then a 3" or 4" diameter pulley would be Ideal, Belt rap-around contact, with the pulley is important, a J-7 Rib would do the job, for that motor Hp, a J-10 would be over kill, but not a problem if you went with a 10 Rib.
    Mactec54

  11. #11
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    Re: BT30 spindle belt is terribly loud.

    hmm. I'm limited to 60mm on the pulley. Will that be a problem?

  12. #12
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    Re: BT30 spindle belt is terribly loud.

    Quote Originally Posted by Azalin View Post
    hmm. I'm limited to 60mm on the pulley. Will that be a problem?
    Then go with the 10 Rib-J profile and you will be ok, just go as big as you can fit.
    Mactec54

  13. #13
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    Re: BT30 spindle belt is terribly loud.

    Finally had the time to get the belt. I'll cut the pulleys this weekend.

    Sent from my MI 5s Plus using Tapatalk

  14. #14
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    Re: BT30 spindle belt is terribly loud.

    Quote Originally Posted by Azalin View Post
    Finally had the time to get the belt. I'll cut the pulleys this weekend.

    Sent from my MI 5s Plus using Tapatalk
    That belt looks wider than 10 Rib
    Mactec54

  15. #15
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    Re: BT30 spindle belt is terribly loud.

    One rib is 2.34mm so it is very wide. I'll probably cut some to make it 20mm.

    Sent from my MI 5s Plus using Tapatalk

  16. #16
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    Re: BT30 spindle belt is terribly loud.

    Hi,

    My first try. PJ profile, cutter angle is 40 degrees, 2,34mm distance, 2.06mm groove depth. However I feel like I need to go deeper. What do you think?





    Attached Thumbnails Attached Thumbnails IMG_20211107_222444.jpg   IMG_20211107_214008_HHT.jpg  

  17. #17
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    Re: BT30 spindle belt is terribly loud.

    Quote Originally Posted by Azalin View Post
    Hi,

    My first try. PJ profile, cutter angle is 40 degrees, 2,34mm distance, 2.06mm groove depth. However I feel like I need to go deeper. What do you think?





    Should go all the way in, when machined, it needs a radius on the top and bottom like these spec's
    Attached Thumbnails Attached Thumbnails Poly-V-Belt Pulley Tec.PNG   Poly-V-Belt Pulley Tec-2.PNG  
    Mactec54

  18. #18
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    Re: BT30 spindle belt is terribly loud.

    Made a new one but with 0.2mm top radius. Fits perfect. However when I have 2.06mm groove depth then there is a space under the belt. Is this ok?

    Sent from my MI 5s Plus using Tapatalk

  19. #19
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    Re: BT30 spindle belt is terribly loud.

    Edit: I think the space is because I tested it with the belt grooves faced outside so the grooves are shrinked a bit. The space is much smaller when I test with the grooves are facing inside.

    Sent from my MI 5s Plus using Tapatalk

  20. #20
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    Re: BT30 spindle belt is terribly loud.

    Quote Originally Posted by Azalin View Post
    Edit: I think the space is because I tested it with the belt grooves faced outside so the grooves are shrinked a bit. The space is much smaller when I test with the grooves are facing inside.

    Sent from my MI 5s Plus using Tapatalk
    Yes it should have a small space at the bottom of the groove this is so the Belt can get it's max grip on the sides, if the ribs hit the bottom then it will slip.

    Something like 1.8mm would be the minimum depth.
    Mactec54

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