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Thread: BT30 Spindle

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  1. #1
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    BT30 Spindle

    Continuing from this thread

    Special thanks to @andypugh for his help and assistance.

    I already made the gripper and currently I'm modelling for the rest. I'll add the detail later but if any of you have a question, suggestion, feedback, comment or anything. Just ask away

    Here I am at the moment:



    And the gripper:











  2. #2
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    Re: BT30 Spindle

    The drawbar rod. Used 1.2080 (I guess) steel. Hardened, tempered and grounded.




  3. #3
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    Re: BT30 Spindle

    Here are some details.

    - Lower bearings will be 2x 7009 (A or C) angular contact ball bearing. It is 45x75x16mm
    - On the upper side I'll use one (or 2) 6008 deep groove ball bearing
    - The belleville washers are D2010211. I'm using parallel groups of 3, 24 in total.
    - Gripping force is 3kN and opening force is 5kN (more or less).
    - Needed stroke is 4.2mm but I'll have about 6mm in total.
    - Petals are C45 steel.

  4. #4
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    Re: BT30 Spindle

    50x250mm 2080 steel for the main shaft.


  5. #5
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    Re: BT30 Spindle

    If I'm not mistaken there are 3 type AC bearings with different contact angles. C (15°), A (25°) and B (40°). People ruse A or C bearings but I've never seen anybody used B. Which one would you recommend? I guess B is best if I want minimum play but since the B has a wide contact surface it is also the worst because it'll produce more heat.


  6. #6
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    Re: BT30 Spindle

    50mm seems a bit small for the spindle nose. Have you thought about your dog configuration? I'm attempting to replace an r8 spindle shaft with a bt30 one and had a similar problem. Here's the spec I referenced:

    http://i200.photobucket.com/albums/a...ine-taper5.jpg

    Sent from my SM-G920V using Tapatalk

  7. #7
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    Re: BT30 Spindle

    Not possible with my baby lathe Thanks.



    Sent from my GT-I9300 using Tapatalk

  8. #8
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    Re: BT30 Spindle

    Little changes on the design.


  9. #9
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    Re: BT30 Spindle

    Do you really need 4 bearings on front end? What stiffness are you planning?

  10. #10
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    Re: BT30 Spindle

    The 2 in the middle are just sleeve. Others are bearings. Its hard to tell from the pic tho. Should have colored them.

    Sent from my GT-I9300 using Tapatalk

  11. #11
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    Re: BT30 Spindle

    Here are some pictures of the BT30 spindle I bought from Aliexpress for reference. Hopefully they will be helpful.

    Attachment 303308Attachment 303310Attachment 303312


    Attachment 303306
    The two bearings on the left are pressed up against a shoulder and then a inner race from a bearing is used as a spacer. Then comes the timing belt pulley and nut that holds the pulley on. The two left bearings are sealed. The angular contact bearings on the right are not sealed. They are configured like yours but only one spacer. Further to the right is the labyrinth seal and the nose piece that clamps the outer race of the angular contact bearings against the housing.


    Attachment 303316 Attachment 303322Attachment 303320
    Here is the nose of the spindle shaft. The first picture shows the grooves that make up the most outside part of the labyrinth seal. Then the lighter colored aluminum ring is part of the labyrinth, it has a standing ring (going up in this picture) into an undercut in the steel of the spindle shaft above it. The second picture shows the nose ring, this is what clamps the outside race of the AC bearings. This is where some crummy work was done on my spindle, the aluminum tape you see was used to make up for parts being machined wrong. Where that aluminum tape is the aluminum ring from the previous picture is to be a press fit into. Someone machined the bore of the nose ring too big so they added a couple pieces of aluminum foil tape to bring it back to a press fit. The brown in the bottom of the nose ring bore is coolant and grease that has dried inside.

    -Dan

  12. #12
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    Re: BT30 Spindle

    Nice work Suat. How are you doing the labryth seals on your design?

    Regards,
    Mark
    Regards,
    Mark

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