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  1. #421
    Join Date
    Oct 2008
    Location
    sydney
    Posts
    408

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    Hi all, I have spent the last two days machining up the blank for my replacement wheel. I was nervous at first to commence the whole procedure when it has been at least 12 months since I did a gear. There is much to forget as I have been re-discovering over the last couple of days!
    The bamboo timber machines up beautifully and is silky to touch. I am concerned about the 4mm laminated layers on top and bottom and whether they will stay stuck together. Tomorrow I will start the final machining of the blank.
    Dean.

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  3. #422
    Join Date
    Oct 2008
    Location
    sydney
    Posts
    408

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    The finished gear is amazing to look at (if I do say so myslef) but does remind me of 1970 parquetry flooring! I do love all those pores....hope they don't prove to be an issue long term.
    The bamboo has little wobble normally associated with timer gears.Today I will re-assemble and add the new prototype clock weights.

    Dean.

  4. #423
    Join Date
    Mar 2007
    Location
    Picton, NSW
    Posts
    143

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    Looking good Deano. You continue to amaze me.

    Cheers
    Walesey

  5. #424
    Join Date
    Oct 2008
    Location
    sydney
    Posts
    408

    Default

    Thanks Walesey.
    Today I have finally fitted the new prototype weight boxes. Cheap to make but aesthetically boring. At this stage I don't care as long as it works.
    Here is a picture of the upgrade. I can add weights to the boxes in case I need to fine tune. The white plastic sleeves are straws used to prevent the string touching the inside of the cap screw and fraying. For now they will do but i will need to find something I can glue into the bolt. Dean.



  6. #425
    Join Date
    Oct 2008
    Location
    sydney
    Posts
    408

    Default Help needed locating parts...

    Hi all i need some help locating some parts. I need a free wheeling cog that suits a 1/4 inch chain.A free wheeling cog can be found on a bike. It only delivers torque in one direction only. I need such a Beast to attach to a motor to wind up my clock weights!.

    cheers

    Dean.

  7. #426
    Join Date
    Mar 2007
    Location
    Picton, NSW
    Posts
    143

    Default

    Dean,
    What sort of chain are you using to drive it? Bike chain or clock chain?

    Could you perhaps pinch a slip sprocket from an old push bike and mount it somehow on your motor shaft?

    If you were using clock chain, perhaps you could cannibalise an old grandfather clock movement and use the click/ratchet arrangement from one of the main wheels?

    Have you thought about the issue of "Maintaining power"? While you are winding the clock, there is no power being delivered to Going Train, and the clock effectively stops for the duration of the wind cycle, unless you can devise a secondary source of power to drive the hands while you are winding the clock (ie, "Maintaining Power").

    Cheers
    Walesey

  8. #427
    Join Date
    Jan 2014
    Location
    Sydney Upper North Shore
    Posts
    4,464

    Default

    Quote Originally Posted by 1964deano View Post
    Hi all i need some help locating some parts. I need a free wheeling cog that suits a 1/4 inch chain.A free wheeling cog can be found on a bike. It only delivers torque in one direction only. I need such a Beast to attach to a motor to wind up my clock weights!.

    cheers

    Dean.
    If your talking sprag or one way clutches, we use small ones in the front of some vehicle alternators. Maybe they can be fitted to a suitable cog. Do you have any specs on the cog ie. Diam, no. of teeth? I presume each link is 1/4" long?
    I can possiblely lay my hands on some bits and pieces
    Last edited by Lappa; 9th July 2015 at 10:13 PM. Reason: Spelling

  9. #428
    Join Date
    Oct 2008
    Location
    sydney
    Posts
    408

    Default

    Hi Guys,
    Yes the idea of maintaining power has just occurred to me. At this stage I don't have a refined enough solution to mention! I Will be using 1/4 inch chain. I have thought of using a bike ratchet but which wont suit the small chain I am using. I think I will need to make my ratchet. Thanks Lappa for the offer of parts. I will use already devices if they suit. I will let you know!

    cheers

    Dean.

  10. #429
    Join Date
    Nov 2010
    Location
    Gippsland Victoria
    Posts
    706

    Default wiggly joints

    Quote Originally Posted by 1964deano View Post


    Hi all, I have spent the last two days machining up the blank for my replacement wheel. I was nervous at first to commence the whole procedure when it has been at least 12 months since I did a gear. There is much to forget as I have been re-discovering over the last couple of days!
    The bamboo timber machines up beautifully and is silky to touch. I am concerned about the 4mm laminated layers on top and bottom and whether they will stay stuck together. Tomorrow I will start the final machining of the blank.
    Dean.
    Dean,

    What do you use to make the wiggly joints - whats the name of that type of joint - is it fairly common or something you made up yourself ?

    https://www.woodworkforums.com/attach...0&d=1435792926

    Looks amazing.

    Bill

  11. #430
    Join Date
    Oct 2008
    Location
    sydney
    Posts
    408

    Default Wiggly joints

    Hi Bill,
    and thankyou.
    I designed up the joint based on the Leigh joint called "bears ears". https://www.leighjigs.com/isoloc.php.
    Are they common? They are only used by me when making clocks or anything else as far as I know....
    Machine used: Roland MDX-40 (Rapid Proto typer) to make them.

    I call my joint a trisolock joint. I hope mine lasts the distance!!

    Dean,

  12. #431
    Join Date
    Oct 2008
    Location
    sydney
    Posts
    408

    Default Improved ratchet system started

    Well the new and vastly improved way of winding up the weights has began. I have re-purposed a hub from a local bike shop. Initially I only wanted the ratchet part of the wheel but upon closer inspection I began to realise just how close the hub design and its purpose was to my design and purpose. So I bored out one end of the hub (pic 1) to fit the existing bearing on my main arbour. I then bored out the middle of the ratchet to accept the 1/2 inch shaft. With this design I will have to abandon my handwheel for the moment, but will make another just in case this whole design somehow wont work. I need to create a timber bobbin for the string to wind around over those curved surfaces of the hub. Should be interesting.
    Tomorrow I will re-print the ratchet to fit over the end of the hub.
    More later!



    Dean.

  13. #432
    Join Date
    Oct 2008
    Location
    sydney
    Posts
    408

    Default

    I reprinted the ratchet only to discover that I printed the teeth the direction! Oh well Will have to remake. I decided to cut the hub in half to make the wooded sleeves easier to fit. I plan to use 3 long bolts to hold it all together. The drum will be as wide as possible to minimise running the clock faster due the the larger diameter. Hope that makes sense. I re bored the internals of the hub so it wouldn't foul shaft as it turned. Finally fitted it all together just to see how things were. It looks like it will physically work. My only concern at this stage is whether there is enough energy in the system to turn over the ratchet once its rinning. We shall soon see. All the gears will need some small re-alignment.



    Dean.

  14. #433
    Join Date
    Oct 2008
    Location
    sydney
    Posts
    408

    Default Major upgrade...

    Hi all I am right in the middle of the major upgrade. This involved replacing the winding drum and moving all of the gears to accommodate those changes. During the works I re-made some parts that never quiet worked right. The escarpment was pinned to the shaft with a single grub screw; this was secure but difficult to move if needed (like now!) so now it has two aluminium bits with grub screws either side to make adjustment heaps easier.
    The timing wheel I discovered was slipping on the shaft so I attached another bit of wood that has a grub screw that can secure it to the shaft rather than just relying of a press fit. If you look closely you can see how the grub screw has cracked the timber!! I just didnt have a round of alley big enough to do the job so I settled for timber...for now.


    Tomorrow I will be re-assembling the wooden drum over the bike hub and hopefully re-connecting the strings to see what happens!.






    Dean.

  15. #434
    Join Date
    Jun 2015
    Location
    Sydney
    Posts
    73

    Default

    Great thread Dean, why not use a bit of flat ally (10mm thick) and cut it out on the CNC maybe easier than a round.

    Col

  16. #435
    Join Date
    Oct 2008
    Location
    sydney
    Posts
    408

    Default Help needed....

    Hi everyone...I have recently been re-designing my new ratchet system but due to a lack of experience and knowledge I have been unable to solve a problem.

    There are three cogs in my design. All have fixed centers. The outer two act as spring loaded ratchets resisting the middle's cogs desire to rotate anti clockwise......so far so good. The middle cog I just cant seem to get right in terms of designing the teeth to match the outer cogs. HELP!!
    I have recently learned to calculate the D Pitch of the cogs involved but cant seem to make them as accurate as I ma used to.
    Only gear nerds need respond!! Sorry that included all other including myself. Its complex stuff apparently!

    cheers

    Deano.

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