Weekend Projects

Discussion in 'Off Topic' started by Resistance, 1/8/20.

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  1. Christos

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    What is the final ppm or EC value of your reverse osmosis water?

    I ran tests on my current water filtration and only noticeable difference was a PH reading of 0.5 less than tap water. I cannot comment on any pesticides or chemicals that are in the tap water. (I would recommend filtration irrespective of tap quality to remove bacteria and other impurities I don’t have the equipment to test for)

    I was thinking of getting reverse osmosis but my water quality is quite good 50- 100 ppm. RO wouldn’t help me much. Only think I can think of is perhaps the RO changes the PH of the water making it slightly less alkaline towards PH neutral.
    Most people agree that a slightly acidic PH in water tastes better than tap water.
    To put things into perspective, tap water is around 8.5PH where spring or bottled water is around 5-6PH.
     
  2. Raindance

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    Raindance Vaping Addict ECIGSSA Donor

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    After very careful testing with the most state of the art equipment at my disposal the following results:
    Plain tap water:
    9FCC2C92-9657-401F-A654-121F1231B4C7.jpeg

    Filtered tap water:
    08DC0B8B-B6B1-4955-B2C3-38C76ADFE2D7.jpeg

    No comment.

    Regards
     
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  3. Christos

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    Interestingly, Please remember to top yourself up with calcium and magnesium as our tap water and your RO water should have very little in it!
     
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  4. blujeenz

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    blujeenz Loafing since 2013 ECIGSSA Donor

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    After 3 days of flops and tribulations, I finally have an angle plate, shown mounted on my mill table.
    The next stage is searching for some 25mm dia steel bar to mount a 4 jaw chuck on the end and all will be complete.
    mounted.jpg
     
  5. Intuthu Kagesi

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    Intuthu Kagesi Ignoring dimwits-d

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    Well done! :clap: ... That 100:1 gearbox with a Arduino behind the stepper motor is going to make it indexable and possibly more accurate than the bearing backlash on that box :number_one:
     
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  6. blujeenz

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    Thanks, that was my plan to make a dividing head/ rotary table.
    There doesnt seem to be any backlash trying to wiggle it by hand, but we'll see once I have a keyed spindle in there.
     
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  7. Intuthu Kagesi

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    Intuthu Kagesi Ignoring dimwits-d

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  8. Christos

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    Interestingly, I took a reading of a popular bottled water brand that I have as we did not have water yesterday.

    Turns out the PH 7.8 - not far off from my taps 8.1 reading and the EC of the "Pure" water was 0.4 - roughly 200PPM compared to the 50PPM from my tap.

    I was expecting the water to be less alkaline firstly. the EC reading would also be alarming but the EC reading can be justified possibly by being "spring water", having calcium, magnesium and other dissolvable solids found in spring water.

    I am still impressed with the quality of water we have in JHB but as mentioned before, these are basic tests and I do not have the equipment to test for other chemicals or bacteria that could be present in the water.
     
  9. blujeenz

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    After much searching I was kindly given a piece of high carbon steel(25mm dia x 130mm long) by the gent at Zaya Metals in Montague gardens.

    You could say this pic is sponsored by Zaya Metals. :)
    shaft chuck1.JPG


    The complete unit bolted together. Currently using 3 standoffs between the gearbox and angle plate, but I might leave them off and just cut a clearance hole for the worm's hub.
    stepper worm chuck - Copy.JPG


    Mounted on the mini mill, checking backlash which was an expected 9/100mm call it 0.1mm.
    Run out on the chuck face is a more worrying 0.15mm.
    Still busy with the blue printing to see which bolt hole combo gives the least error.
    checking backlash - Copy.JPG

    EDIT: the next day.
    I decided to mill the worm hub mating face square in the fixture and then keyed the adapter flange and milled that square as well.
    Now the face runout on the flange/chuck side is a respectable 0.01mm.
    Black lash is down to 8/100 mm after dimpling the key with a center punch, not a huge concern as long as you rotate in the same direction and dont reverse at all.
    milled face runout.JPG
     
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    Last edited: 20/10/21 at 20:14
  10. Resistance

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    Resistance Vaping Royalty

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    Sheer brilliance!
     
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  11. Intuthu Kagesi

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    Intuthu Kagesi Ignoring dimwits-d

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    That is friggen clever! :number_one: WELL DONE MAN!
     
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  12. blujeenz

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    A bit of vibration causes my mill head to drop resulting in a cutter crash, gouges the work piece and knocks the column out of perpendicular.
    So far I havent stripped the plastic gear on the motor shaft, but I figured it was time to do something.

    These mini mills use a torsion spring to counter the 17kgs of the head, a very poor design. I tried adding a 30mm bar link but it only made things worse at the top of travel and not much improvement at the bottom.
    mill link before.JPG
    I had an idea of using a counter weight hanging at the back, so I popped onto the interwebs looking for mods.
    Qquite a few Americans using gas struts, with a company selling a kit.

    airspring.jpg
    I'm going for the sub- economy version because I cant find a module 1 rack in the right size in South Africa.
    So basically just a gas strut, 2m of 1.5mm dia wire rope, 2 pulleys, some mounts and hardware.

    Gas strut came from McNaughtans in Parow, its the K4046 charged to 180 newtons. (R135)
    The Youtube mods typically use 2 struts and one cable, I'm going with one strut and 2 cables to balance the load.
    It probably should work okay. :)
    gas strut.JPG
     
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