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Longcase Pendulum Clock 2021


Gina

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I'm coming back to this project after a rather long break so decided to start a new Blog as this is a new start.  The design spec is rather different.  No moon dial and no perpetual calendar as that proved too cluttered.  I hope to have a striking mechanism.  Also, I'm hoping to arrange something to make the clock keep good time.  As before I shall have automatic winding but automatic precise time-keeping would be nice.  I don't think that's cheating as this is already quite far away from a standard longcase clock.

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Gina

Posted (edited)

TBH I'm not sure.  It's proving pretty difficult to work out how the gravity escapement is going to fit in.  Also, as you say there's a lot to re-design whereas I already have a lot of the parts made for a standard escapement.  I might be able to get the deadbeat escapement working in appearance if I drive the pendulum separately.  Rather like a slave clock.

Maybe I should have another go at the deadbeat escapement.

Edited by Gina
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I've printed the deadbeat anchor and the escape wheel and now reassembling the clock, having stripped it down to try the gravity escapement.

Edited by Gina
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On 18/01/2021 at 14:58, Gina said:

I've worked out that I should be able to get away without an extra gear pair but with higher ratios - though I have to test that out. 

6:1 from chain wheel to centre wheel with the chain wheel going faster (can do this because the auto-winding can keep up with the faster chain drive).  Then two stages of 10:1 give the overall ratio from centre wheel (60m) to escape wheel (6s) of 600:1.  Or do you think I'm being too ambitious?

The critical thing is how small (tooth count) a pinion can you use? You might consider using 1 mod gears?

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ATM I'm trying the deadbeat escapement as that need far less work.

Edited by Gina
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On 20/01/2021 at 14:59, Stub Mandrel said:

The critical thing is how small (tooth count) a pinion can you use? You might consider using 1 mod gears?

Considering I'm printing GT2 timing pulleys very nicely I see no problem with mod 1 spur gears.

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On 22/01/2021 at 12:09, Gina said:

Considering I'm printing GT2 timing pulleys very nicely I see no problem with mod 1 spur gears.

That would let you double the pinion tooth counts and get a better form.

 

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