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  1. #41
    Join Date
    Aug 2016
    Posts
    132

    Re: Let's build some ISO20 spindles

    An oil chiller is not an absolute requirement for high speed spindles. Fanuc RoboDrills come with 24k spindles (ceramic, gease packed bearings) that are air cooled.

  2. #42
    Join Date
    Jun 2007
    Posts
    3891

    Re: Let's build some ISO20 spindles

    those 24k fanuc spindles spindles also have low preload and a relatively short service life.

    coolant around the spindle and bearings on a belt drive spindle is *mostly* about thermal stability. the fluid keeps the spindle within a few degrees, and you get more accurate parts. you also get less chance of the bearings binding up - which can happen if the nose gets very hot.

    I would say for your first spindle, disregard any cooling

  3. #43
    Join Date
    Jun 2007
    Posts
    3891

    Re: Let's build some ISO20 spindles

    For the bearings, use grease. Oiler systems are out of the scope of what you need. These days the only machines using oil mists are large spindles running very fast (40krpm HSK50 for example). The bearings you buy will actually tell you what to use for a given preload and rpm. If you are using cheap bearings, none of this will even matter.

    I was at CMTS today and saw a number of rather nice spindles.

    you should look at:

    Meyrat
    NSK America
    Jianken
    Microlab
    Andersen
    HSD

    Those guys all make small spindles, some with motors, some belt, some direct, ranging from hundreds to tens of thousands of dollars. Microlab basically makes exactly what you are trying to do, for about a grand. Study how they have laid them out, power, bearing size, rpm limits.

  4. #44
    Join Date
    Mar 2014
    Posts
    1131

    Re: Let's build some ISO20 spindles

    Hi,

    I've been busy with other things but managed to make some small progress on the spindle too.

    I'm still going with the belt drive design but thinking about the direct drive idea.

    When I connect the spindle with a coupling to the motor on the top then how the air cylinder works? How to design it?

  5. #45
    Join Date
    Jun 2007
    Posts
    3891

    Re: Let's build some ISO20 spindles

    Quote Originally Posted by Azalin View Post
    Hi,

    I've been busy with other things but managed to make some small progress on the spindle too.

    I'm still going with the belt drive design but thinking about the direct drive idea.

    When I connect the spindle with a coupling to the motor on the top then how the air cylinder works? How to design it?
    Direct drive cant use an air cylinder generally. not impossible, but its not space efficient.
    Most will be hydraulic, some mechanical.

    you put a cross pin through the side of the spindle to actuate the drawbar, and then press that with a hollow hydraulic cylinder in the housing, or a mechanical lever..

  6. #46
    Join Date
    Aug 2016
    Posts
    15

    Re: Let's build some ISO20 spindles

    Quote Originally Posted by Azalin View Post
    Hi,

    I've been busy with other things but managed to make some small progress on the spindle too.

    I'm still going with the belt drive design but thinking about the direct drive idea.

    When I connect the spindle with a coupling to the motor on the top then how the air cylinder works? How to design it?
    What are the dimensions (and angle) for the iso20 holder I'm also trying to make one.

  7. #47
    Join Date
    Jun 2007
    Posts
    3891

    Re: Let's build some ISO20 spindles

    Quote Originally Posted by vandalo05 View Post
    What are the dimensions (and angle) for the iso20 holder I'm also trying to make one.
    look up shaublin iso 20
    they have a drawing that shows the tool holder and the taper (and their gripper).

    You can buy iso20 er holders for $10. so, hard to justify making your own, unless you need something special

  8. #48
    Join Date
    Mar 2014
    Posts
    1131

    Re: Let's build some ISO20 spindles

    Quote Originally Posted by vandalo05 View Post
    What are the dimensions (and angle) for the iso20 holder I'm also trying to make one.
    Angle is same in all iso type holders. I don't remember right now the exact value.

    Sent from my MI 5s Plus using Tapatalk

  9. #49
    Join Date
    Aug 2016
    Posts
    15

    Re: Let's build some ISO20 spindles

    Quote Originally Posted by Azalin View Post
    Angle is same in all iso type holders. I don't remember right now the exact value.

    Sent from my MI 5s Plus using Tapatalk
    7/24
    or
    8 deg 17'50"
    its like 8.2972°
    or another ?


  10. #50
    Join Date
    Mar 2014
    Posts
    1131

    Re: Let's build some ISO20 spindles

    Let me check.

    Sent from my MI 5s Plus using Tapatalk

  11. #51
    Join Date
    Aug 2016
    Posts
    15

    Re: Let's build some ISO20 spindles

    Quote Originally Posted by Azalin View Post
    Let me check.

    Sent from my MI 5s Plus using Tapatalk
    Thanks bro, it will be very helpful, since the vendors are crazy they ask for $ 1000 or $ 2000 and obviously I can not pay that if I am going to start this CNC as a hobby

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