Bridgeport simmple knee dial mods for the visualayimpaired

Discussion in 'Machining with Disabilities' started by GailInNM, Feb 10, 2019 at 5:43 PM.

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  1. Feb 10, 2019 at 5:43 PM #1

    GailInNM

    GailInNM

    GailInNM

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    First off to set the stage, I started having vision problems about 20 years ago , Today I have been legally blind for about a year and a half. This means that to see any detail I need lots of light, and magnification. I have lots of overhead light and various magnification items. But on the Bridgeport knee dialif I get closee enough to see the dial my head blocks the light.

    The first mod adds a tactile indication of where the zero is on the dial. The photo shows it all. Under the zero a hole was drilled and tapped 2-56. The dial is hollow so a short screw does not interfere with anything wen threaded into the hole. I used a 1/8 inch long pan head screw. With just a little bit of practice I was easily able to get the dial within 0.005 with out even seeing the dial. Then I only had to tweak the dial a bit to zero it using magnification. Eventually I plan to add some dedicated lighting to the dial so I don't have to use a flashlight to do the final setting.

    Another problem was the engraved index mark on the bearing housing. It was difficult for me to see. I tried fillig the engraved line with white LaquerStik and also tried polishing the black finish off and filling the engraving with white. Neither improved the visibility enough to use easily. But, while working in this area I noticed that the the bearing housing was recessed into the casting leaving a groove around the bearing housing a little over 1/16 inch wide and almost an 1/8 inch deep. I had to clean 35 years of grime out of the groove to measure it. I cut two strips of 1/16 inch thick XX ,7/16 wide X 3 inch long black on white engraving stock. I put a triangular pointer on one of the strips and a wide black line on the other. This gave me two variations to try. A strip was bent around the bearing housing and pushed into the groove. After trying both strips I liked the triangular pointer much better than the line.

    Gail in NM
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  2. Feb 10, 2019 at 7:41 PM #2

    DJP

    DJP

    DJP

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    When I read your post I was hoping it would solve my problem too. The front bellows that protect the ways shade the index mark making it hard to see. A small LED lamp in the area may be my only solution as my mill casting does not have the groove where you placed the white strip with triangular pointer.

    Have you considered using an audible signal to compensate for lost vision? In archery there is a small spring strip attached to the bow and it follows the arrow during the draw until the tip of the arrow passes and the spring strip makes a click sound to indicate full draw. With your zero screw location a spring might work to 'click' when at the index mark.

    Just a thought for your consideration as we all learn to substitute other senses when one is lost.
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