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  1. #61
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    Hi Russell, I too deal with shaun he is great. What is DOC? I have used a roughing and finishing. The roughing: xy =45, Z=30, Cut in amnt =-4 and a finish margin of 0.2. While finishing: xy =35, Z=30, Cut in amnt =-2 and a finish margin of 0. My isoloc gears take 8hours from start to finish!. (overkill yes).
    Dean.

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  3. #62
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    Hi Chris, I like blending the old with the new hence I have made my clock using a CNC machine and solid modelling software. I have salvaged hard disks out of computers for parts; the bearings of a number of shafts for my clock and some covers. Why? I love the look of the covers and the bearing were free and they suited my project. For me, the accuraqcy of the clock is important and here is where the electronics come into play. Normally the weight powers the clock; turns the hands and powers the pendulum. In my case I wanted to reduce the clock weight because its the weight that contributes to the overall wear in the clock. Also the weight needed to make my clock works tends to make the clock sag;to overcome this I will add some extra cogs to place the weight at the back of the clock where its leaver arm is shorter. The device I have just brought features a circuit that applies a small push to the pendulum bob. It comes with a magnet that fits inside the pendulum rod. I plan to install it in reverse; instead of having it in a box underneath the pendulum and the magnet inside the pendulum rod. I thought that it would be better visually to have the mechanism in the pendulum bob and the maget fixed underneath.As pictured below, my pendulum is made from two parts; I could theoretically hollow them out a bit to make room for the circuit.

    So the mechanism powers the pendulum's movement but I still need some weight to turn the gears; alot less if the weight were the sole means of powering the clock. Also as mentioned the circuit regulates itself and knows how to keep the pendulum swinging a 1 times every second. As I have a second a 1 second pendulum set up ( my timing wheel has 60 teeth one for every second) its perfect for me.
    Hope that makes sense and I hopes I can make it work in reverse.
    Dean.
    Last edited by 1964deano; 12th April 2012 at 10:37 AM. Reason: spelling

  4. #63
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    Aug 2010
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    Glenbrook NSW Australia
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    Dean
    Do you not think it will drive the clock of this size with no weights or has Dick suggested this set up?

    Russell
    vapourforge.com

  5. #64
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    No I know that a weight is necessary to drive this design of clock, other designs can be driven entirely with an electromagnetic pendulum.Mine is not one of them. Dick did not suggest this set up; I have seen it on youtube only once and I thought it would be a good idea!

    Dean.

  6. #65
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    Dean Go for it Can wait to see the results
    I will down the track get electromagnetic pendulum myself. Need a good clock in the lounge room and power there is not a problem. The plastic AA battery Chinese one there I found running backwards for 10 minutes the other day fix it self but is now 20 minutes slow


    Russell
    vapourforge.com

  7. #66
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    Hi all just decided to have two weights to power my clock rather than 1. Hopefully this will prevent the frame from sagging and there being two weights will be more balanced.I will plumb the string under the first cog and over the one toward the back. I want to know if there is any advantage in varying the diameter of the two cogs as pictured?

    I am thinking its is like the changing gears on a bike. If the front gear is larger the peddling is harder thereby having a greater mechanical advantage. I am not sure whether there is any difference if I vary the diameter of either cog or not.
    cheers,

    Dean.

  8. #67
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    Dean
    You are not changing the mechanical advantage with your design just the direction. You are also adding more friction as you have to turn the pulleys. I would be using some low friction bearing. A ball bearing will handle the weight ok with little or no oil in it, something like roller skate bearings.

    Dean you have encouraged me to start my own clock have got the the plans for a Brain law clock 11. Will start a thread soon and post a link here later

    Russell
    vapourforge.com

  9. #68
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  10. #69
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    Thanks for clearing that up...though as much. I will be using a roller bearing(one that could be used in a skateboard) in each of the four wheels. The new design will change the leaver arm of the system so that the resultant force is at 45 rather than 90 degrees to the clock frame; a little improvement.Will be cuttting the 4 wheels tomorrow.Should look something like this.

    Hey just checked out No 11 on the website; I like it. I think the escarpment is a better design than the one I have. Hey you will enjoy the journey making he clock. It has changed my life in that I have learned how to pace myself and be more patient.
    cheers
    dean.

  11. #70
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    Dean
    I have been so wrapped up in my own clock all else has been forgotten.
    Your wheels will work well no problem there
    One thought and this might not apply to your design, is when you move your weights to the back, make sure that there will not be a problem with the pendulum. Just checking

    Just rereading some early reply and you asked what DOC meant = deep of cut

    I do not understand your terminal knowledge here "roughing: xy =45, Z=30, Cut in amnt =-4" Is this feed expressed in mm per minute? and DOC =4mm?

    Russell
    vapourforge.com

  12. #71
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    Russell, The weights are well clear of the pendulum.The xy & Z is in mm/sec and cut in amount is in mm. Lots of my files are .4mm for roughing and .2 for the finishing cycle.
    Just finished making a pro-type for my wheels and weight set up. Just waiting for the UNC tap to arrive!.
    Dean.

  13. #72
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    Dean
    Where's the photos?

    Russell
    vapourforge.com

  14. #73
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    Ok here are the photos!
    Have recently made a prototype of my weight set up.




    I need 6 kg to make my hands turn. I loaded all the weight i had on hand (16KGS!)but could not get my clock to turn!
    The last picture is of my electromagnetic pendulum set that arrrived from the US a couple of days ago.
    I will simplify the weight system by having 1x6kg weight instead of 2x3kg weights and move the rear wheels further away from the pendulum.

    Dean.

  15. #74
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    Quote Originally Posted by 1964deano View Post
    I need 6 kg to make my hands turn. I loaded all the weight i had on hand (16KGS!)but could not get my clock to turn!
    While not knowing anything about clocks, I wonder if it is a leverage issue?

    When trying to move a rock in the yard, a long piece of timber levering under the rock is easier than a short piece of timber.

    So carrying this across to the clock, the drum where the string originates from may need to be a bigger diameter, allowing greater leverage. Just a thought. Not sure if it could be implemented though, or even practical.

    Cheers

  16. #75
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    I thought of that as well some time ago. I wanted to make the diameter of the drum twice its current size.It would increase its leaver arm ie you could reduce the weight needed but the downside it would need to wound more often!

    Dean.

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