Large Wheel Clock

[David NobleParticipant @davidnoble71990]

I'm having a look at the John Wilding Large Wheel Clock book. Not having cut any gears before I am, perhaps understandably puzzled by the instructions which state that I only need two cutters, 0.75 mod and 0.6 mod. From the little I understand, I will need one 0.75 mod cutter for the large wheel of 290 teeth and another 0.75 mod cutter for the pinion which has 8 teeth, Is this correct?

Many Thanks, David

Edited By David Noble on 19/01/2019 14:54:00

[David NobleParticipant @davidnoble71990]

[Alan Wood 4Participant @alanwood4]

Good afternoon David

It might help you to watch Chris at Clickspring who made this clock and very professionally made videos of each step.

Cutting the gears can be found here

**LINK**

Alan

[Russell EberhardtParticipant @russelleberhardt48058]

Yes but for a one off it may be more economical to buy the pinion ready cut from Ian Cobb.

Russell

[BizibilderParticipant @bizibilder]

Yes buy a ready made blank as suggested – you will still have to cut to length, drill it, harden and polish it! Alternatively you could make lantern pinions from scratch.

[David NobleParticipant @davidnoble71990]

Posted by Alan Wood 4 on 19/01/2019 15:45:30:

Good afternoon David

It might help you to watch Chris at Clickspring who made this clock and very professionally made videos of each step.

Cutting the gears can be found here

**LINK**

Alan

Thank you Alan, great series, if a little intimidating for a newby !

Best Wishes, David

[David NobleParticipant @davidnoble71990]

Posted by Russell Eberhardt on 19/01/2019 15:48:01:

Yes but for a one off it may be more economical to buy the pinion ready cut from Ian Cobb.

Russell

Thanks Russell, probably a rush of enthusiasm but I was hoping to make it all. However, we will see

David

[David NobleParticipant @davidnoble71990]

Posted by Bizibilder on 19/01/2019 16:18:08:

Yes buy a ready made blank as suggested – you will still have to cut to length, drill it, harden and polish it! Alternatively you could make lantern pinions from scratch.

Thanks Bizibilder, I hadn't considered lantern pinions. How would I calculate the dimensions?

David

[BizibilderParticipant @bizibilder]

From Laurie Penmans book " Clock design and construction" (which is available at very silly prices from some well known on-line sites!!) says on Page 40:

"The pitch circle of the rods may be taken as the pitch circle of the pinion for calculating centre distances. The rods should allow clearance in the gash between each wheel tooth. 1.25x module should work quite well but the system is not critical as long as there is no binding in the wheel."

So – make 'em any reasonable size you like as long as they fit and are strong enough!!

I've made lantern pinions using brass bobbins and dressmakers pins for the rods.  Drill on the Pitch circle and ensure you have the bobbin deep enough to take the wheel tooth addendum without fouling anywhere.

Edited By Bizibilder on 19/01/2019 17:39:42

Edited By Bizibilder on 19/01/2019 17:42:09

[roy entwistleParticipant @royentwistle24699]

It is usual to use a smaller MOD to cut the pinions. But you use the larger MOD to calculate the diameter of the pinions. It gives stronger teeth in the pinion

Roy

[John McNamaraParticipant @johnmcnamara74883]

Dressmakers pins come on two forms hard steel and soft plated brass, Newey hard steel "Dorcas" pins are good quality, used by the sewing trade. I guess these are what you want if you use pins. They look almost the same.

[Sam StonesParticipant @samstones42903]

Adding to the above David, I used sewing needles for even greater precision and fit.

There are a couple of other useful ideas to making lantern pinions, such as supporting the drill once it has passed through the first (lantern) flange.

Keep up the good work; making a clock is a wonderful experience and exercise.

I look forward to your progress.

Sam – The one clock man

PS there are a few other pictures in two of my albums about John Stevens' clock.

[David NobleParticipant @davidnoble71990]

Posted by Bizibilder on 19/01/2019 17:39:08:

From Laurie Penmans book " Clock design and construction" (which is available at very silly prices from some well known on-line sites!!) says on Page 40:

So – make 'em any reasonable size you like as long as they fit and are strong enough!!

That's great advice thank you

[David NobleParticipant @davidnoble71990]

Posted by roy entwistle on 19/01/2019 21:43:10:

It is usual to use a smaller MOD to cut the pinions. But you use the larger MOD to calculate the diameter of the pinions. It gives stronger teeth in the pinion

Roy

Thank you Roy, as this is my first clock, all this is very helpful

David

[David NobleParticipant @davidnoble71990]

Posted by John McNamara on 19/01/2019 22:49:09:

Dressmakers pins come on two forms hard steel and soft plated brass, Newey hard steel "Dorcas" pins are good quality, used by the sewing trade. I guess these are what you want if you use pins. They look almost the same.

Thanks John, I'll go and see whet the local fabric shop has to offer.

David

[David NobleParticipant @davidnoble71990]

Posted by Sam Stones on 20/01/2019 03:45:41:

Keep up the good work; making a clock is a wonderful experience and exercise.

I look forward to your progress.

Thank you Sam, thank you too for the encouragement. I think I might need it

David

[Sam StonesParticipant @samstones42903]

Hi David,

Check your mailbox. I've sent you a PM.

Sam

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