Newbie Bridgeport ballscrew retrofit, design the yoke


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Thread: Bridgeport ballscrew retrofit, design the yoke

  1. #1
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    Lightbulb Bridgeport ballscrew retrofit, design the yoke

    Hello community,
    I would like to upgrade my old bridgeport serie 1 with chinese ball screw and eventually run it with steppers . I don't have a big budget to buy real precision ground ball screw. Chinese ball screw precision should be fine for me since i am actually manual milling with 0.09 in of backlash in the x and y old acme screw. I wish i could fit a 32mm diameter ,5 mm pitch chinese ball screw.

    My problem is the design of the yoke. I have no equipement to measure the distance between the two axis. If someone has usefull dimensions, it would really help me. ( a CAD or DWG would be AWSOME!!!)

    Thank you guys
    i apologize for my newbiness, i have just started this hobby.
    a+

    Similar Threads:
    Attached Thumbnails Attached Thumbnails Bridgeport ballscrew retrofit, design the yoke-yokeasm-png  


  2. #2

    Default Re: Bridgeport ballscrew retrofit, design the yoke

    Hey
    I'm working on a similar project
    I have solid Work files Bridgeport ballscrew retrofit, design the yoke-yok-jpg of the Yoke



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    Default Re: Bridgeport ballscrew retrofit, design the yoke

    Awesome work!
    did you have chance to measure the axis to axis distance ? There is another important design measure to get is the y axis clearance as the nut passes along the z axis bearing housing.
    Your yoke look way better than mine, ive just sketch the whole geometry.What ballscrew size are you using ? Are you trying to fit chinese ones ?
    Are you willing to share important dimensions or cad ?
    thanks a lot , im glad to know some people tryin to do the same type of upgrade!



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    Default Re: Bridgeport ballscrew retrofit, design the yoke

    I don't have a manual Bridgeport but this is interesting none-the-less... I might in the future... keep going fellas and take pictures.

    Richard



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    Default Re: Bridgeport ballscrew retrofit, design the yoke

    Bridgeport ballscrew retrofit, design the yoke-x-axis-jpg

    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.



  6. #6

    Default Re: Bridgeport ballscrew retrofit, design the yoke

    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



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    Default Re: Bridgeport ballscrew retrofit, design the yoke

    y_shalom did you finished the design of the yoke ? I would really appreciate if you could share some of the measurements.
    Thank you



  8. #8

    Default Re: Bridgeport ballscrew retrofit, design the yoke

    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 meBridgeport ballscrew retrofit, design the yoke-yok_dr-jpg



  9. #9

    Default Re: Bridgeport ballscrew retrofit, design the yoke

    I decided to make the YOK using a 3D printer (printer also designed and manufactured by me)

    (After a note sent to me by e-mail about matching to the machine)

    this is the YOK ,,,, full scale from ABS .

    I'll check if it fit to the machine .

    If necessary. I'll put changes and adjustments.

    Then a steel production ..





    Bridgeport ballscrew retrofit, design the yoke-yok-jpg



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    Default Re: Bridgeport ballscrew retrofit, design the yoke

    very nice drawing , where did you get it?
    thank you for the drawing it will be so useful to me.

    As i can see , the yoke bore is 42mm, and the chinese 32mm 5 mm pitch ball nut has 50mm pilot diameter. Thats why i still think the 32mm chinese nut wont fit.. as i said earlier the z axis bearing housing will be in interference with the nut.



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    Default Re: Bridgeport ballscrew retrofit, design the yoke

    nice abs part shalom!

    tell me if it fits under the bridgeport.
    What year is your bridgeport? If u have noticable wear on the ways , maybe the 101.6mm distance willd be too much , and it will squeeze up the screw. Give me some news. As i will do the same , i am now designing the pulley kit and finishing the screws , as i have a x axis with the old servo type 90 power feed. I will probably need to make a bushing to accomodate the power feed flange needle bearing housing.
    See yall

    I will try to post some pic as soon as i have more parts.
    Ive received my 1600 oz keyed stepper , driver, power supply and breakout board.
    I am also tryin to communication with my GS2 (automation direct) VFD to control the spindle via modbus Mach3 ( still having some trouble to communicate , i think i have made a mistake during wiring of my custom rj12 to db9 rs232 adapter )



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    Default

    Quote Originally Posted by daroc30 View Post
    Bridgeport ballscrew retrofit, design the yoke-x-axis-jpg

    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



  13. #13

    Default 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



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    Default Re: Bridgeport ballscrew retrofit, design the yoke

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



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    Default 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]



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    Default 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?



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    Default 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 ?



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    Default 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



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    Default 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.



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    Default Re: Bridgeport ballscrew retrofit, design the yoke

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



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Bridgeport ballscrew retrofit, design the yoke

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