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IndustryArena Forum > MetalWorking Machines > Bridgeport / Hardinge Mills > Bridgeport ballscrew retrofit, design the yoke
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  1. #13
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    Quote Originally Posted by daroc30 View Post
    Attachment 310430

    i have just completed the drawing of the x axis , in order to send clear infos the the chinese manufacturer. They quoted me the x and y axis of the bridgeport, 25mm -5mm ball screw ( because i think the 32mm nut won't clear under the way ) and the price is 279 CAD$ !!!! with both screws machined! Even if precision and quality is not best , i think the price justify the try.
    Awesome! I have a hafco bm-30a or m603d.
    I so want to do the same. The diameter is 32mm. Total size is 153cm.

    Please dont let this thread die.
    Cheers

  2. #14
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    Feb 2014
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    Re: Bridgeport ballscrew retrofit, design the yoke

    daroc30, good thread, thanks

    Please allow me to provide some of my Manual Bridgeport Ballscrew Upgrade experience..

    You can use the standard manual Bridgeport yoke. Just dump the old ACME screw guts out of it and a ballnut for a 25mm screw will fit perfectly.

    I ordered my ground screws and ballnut assemblies from Winter Engineering in California. I asked Dave Winter to provide ball nuts with flanges to bolt directly to a standard manual Bridgeport yoke. It fits perfect and my machine runs great.

    I spent several months researching the Bridgeport Yoke. I found the same Hiwin yoke print, modeled the part up in Inventor, and ultimately decided the standard Bridgeport yoke was plenty strong. I realized after comparing the Bridgeport Yoke vs the Hiwin Yoke, there was no need to further follow the Hiwin trail.

    Also, the Bridgeport Yoke is built whereby all clearance issues are resolved.

    Hope this helps,

    BT

  3. #15
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    Jan 2017
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    1

    Re: Bridgeport ballscrew retrofit, design the yoke

    Hello.
    Can somebody upload a 3D design of the yoke ?
    (Maybe grabcad or link....)
    Thank you!

  4. #16
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    Dec 2014
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    Re: Bridgeport ballscrew retrofit, design the yoke

    Have you figured out the Yoke I have 50mm ball nuts and I need a yoke made any help would be appreciated





    QUOTE=y_shalom;1850906]Hello darco30

    I rely on this drawing
    The most important measure is the distance between the axes (101.6 mm) .
    The rest is adapted to the screw you intend to use .

    Hope I helped
    If you need more help or information. Do not hesitate to contact me[/QUOTE]

  5. #17
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    Re: Bridgeport ballscrew retrofit, design the yoke

    Quote Originally Posted by JohnDavis View Post
    Hello.
    Can somebody upload a 3D design of the yoke ?
    (Maybe grabcad or link....)
    Thank you!
    Have you received a 3D model of the yoke?

  6. #18
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    Re: Bridgeport ballscrew retrofit, design the yoke

    Quote Originally Posted by y_shalom View Post
    Hi

    I'm going to use a 32 mm 5mm Pitch screws .
    The measurements taken from drawing of a similar Yoke of from HIWIN .
    I would be happy to send you the drawing of the Yok .

    Note : Yok drawing fits a particular ball screw , it is necessary to adjust it for the screw that you want to use .

    Good luck

    Yoram


    Can you share the Yoke drawing ?

  7. #19
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    Re: Bridgeport ballscrew retrofit, design the yoke

    Does anyone know someone who could machine a yoke for me a yoke for me from Fusion 360 Model

  8. #20
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    Dec 2005
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    404

    Re: Bridgeport ballscrew retrofit, design the yoke

    Quote Originally Posted by lt00273 View Post
    Does anyone know someone who could machine a yoke for me a yoke for me from Fusion 360 Model
    Not that I have time... but post up your model and I'll take a look.

  9. #21

    Re: Bridgeport ballscrew retrofit, design the yoke

    It00273 what format is your 360 drawing saved in???

  10. #22
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    Jan 2010
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    2

    Re: Bridgeport ballscrew retrofit, design the yoke

    Hi y_shalom, Please can I have a copy of the SolidWorks files.

  11. #23
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    Apr 2018
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    37

    Re: Bridgeport ballscrew retrofit, design the yoke

    Quote Originally Posted by WilliamT4450 View Post
    daroc30, good thread, thanks

    Please allow me to provide some of my Manual Bridgeport Ballscrew Upgrade experience..

    You can use the standard manual Bridgeport yoke. Just dump the old ACME screw guts out of it and a ballnut for a 25mm screw will fit perfectly.

    I ordered my ground screws and ballnut assemblies from Winter Engineering in California. I asked Dave Winter to provide ball nuts with flanges to bolt directly to a standard manual Bridgeport yoke. It fits perfect and my machine runs great.

    I spent several months researching the Bridgeport Yoke. I found the same Hiwin yoke print, modeled the part up in Inventor, and ultimately decided the standard Bridgeport yoke was plenty strong. I realized after comparing the Bridgeport Yoke vs the Hiwin Yoke, there was no need to further follow the Hiwin trail.

    Also, the Bridgeport Yoke is built whereby all clearance issues are resolved.

    Hope this helps,

    BT
    I need your help and advices. I want to install ballnut to my manual Bridgeport that I will convert to CNC milling at low cost.
    If I understand from your experience, I need to buy 25 mm ballnut with flanges and ask to drill holes to bolt directly to the standard manual Bridgeport yoke and buy the screws that fit with the 25 mm ballut.

    Do you have a draw that shows where to drill the holes in the flanges and how the end of the new screws should be machined?

    Thanks,

    Jeff

  12. #24
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    Feb 2014
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    35

    Re: Bridgeport ballscrew retrofit, design the yoke

    Jeff,

    There are internal clearances in the BP Knee Mill that must be observed. For example, the yoke at times runs close to the Z-Axis jack screw. Therefore, material from the Y-Axis ballnut must be removed to provide adequate clearance for it to pass the jack screw.

    Similar clearance issues will be found with the X-Axis ballnut. So when you look for screws and flanges, be sure to look for Bridgeport Retrofit nuts and screws. You can confirm the nuts you've selected by comparing with other nuts on the market that are known to fit and provide adequate clearance.

    The best documentation on the internet will be found from Hiwin. Hiwin drawings show the cuts necessary for the flanges to pass smoothly inside the knee without interference. Use the Hiwin Yoke drawing with the X and Y drawings to see how the flanges are indexed for the necessary clearance.

    These drawings are for 32mm screws, but the clearances are still the same for 25 or 32 mm screws.

    I used the BP yoke and 25mm screws on my machine for a while. They worked OK, but I was unhappy with the precision. I installed a Hiwin retrofit kit last year. Very happy with it.

    For the Hiwin Manuals
    https://www.hiwin.com/downloads.html#manuals

    For the Hiwin Yoke
    https://www.hiwin.com/pdf/7l0002a3.pdf

    For Hiwin Y-Axis Ballscrew
    https://www.hiwin.com/pdf/a10jsia1.pdf

    For Hiwin X-Axis Ballscrew
    https://www.hiwin.com/pdf/a10jsga1.pdf

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