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Thread: Pneumatic Power Drawbar for Bridgeport Mill

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    thehomeengineer's Avatar
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    Pneumatic Power Drawbar for Bridgeport Mill

    After falling ill, I was struggling to change the tooling on my Bridgeport mill so decided to build a pneumatic power drawbar. There are plenty of great videos on You Tube and other sites for research, So I decided to try and incorporate all the bits I liked in to this project. This works very well and makes tool changing a lot simpler. Some of the hardware was purchased from eBay air fittings, air hose, cylinder linear bearings and shafts, springs, approximate cost for items £50.00 the rest was manufactured in the workshop.
    Last edited by thehomeengineer; 12-14-2017 at 03:48 PM. Reason: spell check

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    extropic (12-15-2017), HUMARIA (09-21-2018), Jon (12-15-2017), LMMasterMariner (05-18-2018), Paul Jones (12-17-2017), rossbotics (12-18-2017), Seedtick (12-14-2017)

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    Is the driver an air impact or an air ratchet?

    Do you have a pneumatic schematic to share?

    I'm guessing that the cylinder engages the socket with the drawbar and the springs disengage them.

    Are both the driver and the cylinder controlled by the same switch? I'm wondering about the timing of powering the driver before engaging the socket onto the drawbar (or is it a non-problem)? Or, are there separate switches for cylinder and driver?

    Real nice looking setup.

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    Hi
    it is a butterfly impact driver and both the cylinder and driver are driven from one switch (The exsisting butterfly switch was removed from the top and modified).

    Pneumatic Power Drawbar for Bridgeport Mill-img_0708.jpg Pneumatic Power Drawbar for Bridgeport Mill-img_0734.jpg Pneumatic Power Drawbar for Bridgeport Mill-img_0710.jpg

    There is no timing the impact driver socket engages over the drawbar with no problems. I will have to draw out the the pneumatic set up and post, but for futher photos are on my web page. http://www.modelengineeringworkshop....er-drawbar.php
    Last edited by thehomeengineer; 12-15-2017 at 12:58 PM. Reason: photo correction

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    Thank you again. I understand the controls now.

    In the pics, on your web site, I see a generous chamfer that you added to the top of the drawbar hex which may facilitate the socket engagement while the driver starting.

    Your work is a pleasure to see. Keep posting and you'll fit right in with the best I've seen on this site.

    PS: looking at the pics regarding "Bridgeport Mill VFD and Tachometer" I see some interesting clamps being used on the drill press. I don't think I've seen that type before. Are they another creation of yours?

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    Paul Jones (12-17-2017)

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    Thanks thehomeengineer! We've added your Pneumatic Drawbar to our Machining category,
    as well as to your builder page: thehomeengineer's Homemade Tools. Your receipt:




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    Hi extropic
    Thank for the kind words and sorry for the delay in responding
    I made the clamps and now have about 10 sets of them if not more. I made my first one when I did my apprenticeship project some 34 years ago. The are very quick and useful to use, so decided to make a batch of them for the workshop. I will do another post on homemadetools.net for the clamps, as you are not the first person to ask about them.
    Thank you again for viewing my posts
    The home engineer

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    Sorry I am late to this party by about 4 months. I couldn't see the clamps clearly in your link mentioned above. Did you subsequently post a clamp-specific thread yet?

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    Quote Originally Posted by Saltfever View Post
    Sorry I am late to this party by about 4 months. I couldn't see the clamps clearly in your link mentioned above. Did you subsequently post a clamp-specific thread yet?
    Thank you for your interest here is the link Claw Clamps a home made clamp system
    The Home Engineer

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    Paul Jones (05-18-2018)

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    Very Nice. THANK YOU. :-)


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