Building Bernard Tekippe’s Precision Regulator

[Chris Raynerd 2Participant @chrisraynerd2]

Hi Michael

Definitely not off topic. That is not how I was going to use the shellac – and now I am!

Thank you very much.

Chris

 

[Chris Raynerd 2Participant @chrisraynerd2]

Evening all

I am just sat here trying to lay out the escapement and I want to do it based on some instructions provided by Bernie Tekippe below:

So I have attempted to follow these instructions, drawn my escape wheel, marked 70 deg and then drawn a tangent back up to the horizontal. If I’m reading it correctly then the height back from the centre of the escape wheel to this point, which is 52mm, should be the distance to the centre of the suspension spring. I should have considered this before building everything as my current distance is 50mm, but not a problem, I can shave 2mm of the top spring support which will raise the suspension spring. So hopefully this is an easy fix.

The bigger question is still understanding the layout and location of the actual pallets! It’s that last sentence. If I’m reading it correctly, I’ve taken the distance from the “suspension spring pivot point” to the mark on the escape wheel where it intersects the 70 deg line. I’ve then used this to form a new arc. I presume where this new arc dissects the rods of my pendulum support arms is the location of the pallets, but of course this is an arc and whilst I know dead beat pallets should be an arc, Bernie does do this. Therefore is the correct location for the slot on the pendulum supports a tangent to this line?

Any help would be much appreciated. My big question is if I’m slotting the pendulum supports, where and at what angle based on my drawings and the instructions. Thanks again everyone.

[John HaineParticipant @johnhaine32865]

Where does 70 degrees come from? The text says 75 degrees. Also the actual bend point is unlikely to be at the centre of the spring but higher up. If you have the mass of the bob and rods and the spring dimensions we have a program that can predict the bend point

[Chris Raynerd 2Participant @chrisraynerd2]

@john haine – yes the 70 deg was an oversight
– 75 deg you are correct.

Thank you for the offer to calculate the bend point. The mass of the rod and bobs is 1.2kg and the suspension spring dims are 0.05mm thick, 15mm wide and 3.5mm tall.

Presuming I drew 75 deg rather than 70, do you have any instructions as to the correct location of the slot for the pallets on the frame?

[Chris Raynerd 2Participant @chrisraynerd2]

@john haine – yes the 70 deg was an oversight
– 75 deg you are correct.

Thank you for the offer to calculate the bend point. The mass of the rod and bobs is 1.2kg and the suspension spring dims are 0.05mm thick, 15mm wide and 3.5mm tall. They are the dimensions of the exposed spring.

Presuming I drew 75 deg rather than 70, do you have any instructions as to the correct location of the slot for the pallets on the frame?

[John HaineParticipant @johnhaine32865]

To do the calculation we need the radius of gyration of the pendulum so the dimensions of the rods and the mass of the bob itself.  I can’t help with the pallets, I seem to recall that the builder over on the NAWCC MB built a location jig for them?  From his photos it looks like he made quite a large flat on each rod with a bridge over the top that clamps down the pallet.  Is that not shown on his 3D model?

[Chris Raynerd 2Participant @chrisraynerd2]

Evening John

Steve did an absolutely incredible job using micrometers in his jig! It was quite phenomenal but seems quite complex compared to the layout instructions Bernie provided. Steve, if I remember correctly, opted for a later design in which the pallets were not horizontally level in respect to the escape wheel. I’ve sent him an email and will see if he replies.

The simple wooden jig I posted, apparently worked fine to locate the pallets in a copy of the Tekippe clock built by another clockmaker. However rather than create a large pocket to adjust the pallets, Colin used his simple jig to cut an accurately located slot in the pendulum pillars and the only thing that needs adjusting is the depth of the pallets – the jig and therefore the slot takes care of their location and angle. The pallets are held in place by a simple clamp style arrangement that you described and I’m happy with this arrangement.

The mass of the bob and pendulum is 1.2kg, the rods are 6mm diameter and 51mm apart to centres.

Perhaps I just need to look again over the next few days to digest them!

Thanks as always for your help and advice.

Chris

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