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Thread: My Wooden geared clock
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4th February 2012, 09:58 AM #46Senior Member
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Hi all just needing some advice regarding the setting up and balancing of my pendulum setup. I emailed Brian Laws whom I purchased the plans from and asked him about how to set up the pendulum. This was his reply...
"The pendulum bob doesn't need to be particularly heavy, the important thing is to adjust the length until the centre of gravity of the pendulum assembly's about 1meter from the pivot. try this laying the whole assembly horizontally across a straight edge and adjust to the point of balance till the straight edge is 1meter from the pivot".
Ok that that mean that i need to add weight to my bob (495 grams) until the whole assembly will balance 1 meter from the pivot?. Why is that? Doesn't it just swing? How does balancing it horizontally help it swing vertically?Is there something i I am missing. Is the 1 meter important in setting the length of time the bob swings for or is it the center of mass of the assembly?. I know the longer the pendulum rod the slower the clock will run.
I take it I can both add weight to the bob and make the pivot lighter to help balance things...
The picture shows the bob located 1 meter from the pendulum head set up.
Cheers
Dean.
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4th February 2012 09:58 AM # ADSGoogle Adsense Advertisement
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5th February 2012, 09:14 PM #47
Dean any luck using the ball mill ?
Russellvapourforge.com
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6th February 2012, 04:01 AM #48New Member
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Hello Mr.Dean
You can find a lot of questions answered regarding the pendulum from the following famous website:
gary's wooden clocks-pendulums
best regards.
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12th February 2012, 10:28 PM #49Senior Member
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Hi Russel and all......life has been hectic since the start of term. Will be getting to those stars soon. Meanwhile have finally understood how the pendulum works.It needs to have the center of mass 1000mm from its pivot point; therefore you are free to either lengthen the pendulum rod or make either end of the pendulum setup (bob or pivot end) heavier or lighter to set up to balance. Now that wasnt that hard was it?!!
Dean.
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15th March 2012, 09:49 PM #50Senior Member
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Quick up date on dial
Hi all
Here is a quick update on the dial. Just finished the purple heart insert on the dial face....the timber bent really well for purple heart; didnt even have to steam it. ! I have finished the dial in organ oil and applied 4 coats. Next job finish those stars....
Dean.
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16th March 2012, 05:49 PM #51
Very nice Dean......
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27th March 2012, 07:43 PM #52Senior Member
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Help with electromagnetic pendulum!!
Hi all ,
my clock is progressing nicely. Now up to the final stages of building. I would like to try and incorporate an electromagnetic pendulum into my design. Just wanted to know if anyone knows where they may be sold?
cheers
Dean.
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11th April 2012, 10:26 AM #53
Dean
I had ask the same question and got this reply. This was on cnczone
Hi
Just read about your Pendulum drive in the thread "Wooden Clock Gears" Look to be a well thought out bit of gear.
What is the cost of the electronics?
What do you have in the pendulum magnet of just steel?
Thanks
Russell
Thanks.
The pendulum uses a very strong rare earth magnet. I can provide a complete, tested electronics package - 4 D cell battery holder, circuit board, and coil - plus magnet for $49.99 plus $5.10 shipping in the US. Paypal $55.09 to [email protected].
Dickvapourforge.com
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11th April 2012, 11:05 AM #54Senior Member
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Magnetic pendulum
Thanks Russell I have been round the world looking either for a kit or someone to help me make one. I have just emailed Dick to ask him if the circuit has any adjust-ability in it ie whether the chip he has used is programmable or not. Hope so I will buy it on the spot! Have you purchased this kit from him? If so how does it go? (ps i will be doing he stars next week)
cheers
Dean.
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11th April 2012, 11:16 AM #55
No I have not got one yet ,only enquired a few days ago, but it looks good.
A question for you and anyone out there. I just got some cad of the same clock that you are making and would like to know if there would be any problems making it using 6mm plywood then the 16mm wood as in the plans. I know some of the sizes would and could be reduced to remove the vacant space that would be created by doing this. But would it work and run ok on 6mm gears instead of 16mm thick gears?
Russellvapourforge.com
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11th April 2012, 12:47 PM #56Senior Member
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I would say that It wont work with the thinner timber. The weight required to make the clock work would be too heavy and will result in the gears warping and or chipping. I helped my student make No 1 and the timber that was used was 9.8mm aircraft plywood. It was not strong enough. So you are making clock 7 are you? A big challenge! If you want any of the files I have used let me know. What CNC & software are you using ?
cheers
Dean.
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11th April 2012, 01:17 PM #57
Thanks Dean
I thought as much....You might be wondering why 6mm... I have a bunch of 2mm cutters that have 8mm depth of cut.... maybe cut two of each gear and glue them together??? 12mm??
Thanks for the offer of your files. I can create the gcode easy enough.
I run rhinocam and emc2 on a small HF mill with a 2.2kw, 24k rpm spindle.
Russellvapourforge.com
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11th April 2012, 02:06 PM #58Senior Member
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Nice set up. Just gave Dick a call and ordered a kit. It features a TI chip that is suited a a second pendulum set up; its what I have. The circuit times the pendulum and automatically compensates for faster or slower times. Just what I wanted.
Hey why don't you drop into SEI carbide in Penrith and pick up a 3mm for $20 ish; I have cut out my whole clock using a 3mm which can handle 16mm. You could laminate the plywood to make the 16 you need. Just a thought.
cheers
Dean.
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11th April 2012, 02:27 PM #59Chris
========================================
Life isn't always fair
....................but it's better than the alternative.
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11th April 2012, 02:58 PM #60
Dean
I am all ears re you new toy. As I read it is has a bi coloured light that lets you know when you have the swing with in tolerance for the timer to handle, good feature.
SEI I have an acount with them The emergency back stop when you need it now! Also Shaun down there is very helpful.
Are you cutting 16mm DOC in one go? if what speeds and DOC are you finding good
Have not got the ply as yet just playing with ideas at this time. Just have a lot of the small carbide bits on my hands.vapourforge.com
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