Wooden clock Escapement wheel design

jlguisao

Registered User
Hello,
I am completely new to clock making.
I am trying to calculate the dimensions for wheel, teeth, pallets, drop, angles, radii etc of the Graham dead-beat.
I have consulted several sources and not two of them agree on the method. I would appreciate it if you could help me with a tried and tested method or if there is any industry standard, could you please tell me what it is?
I used the calculations from The clock Repairer's Handbook too (after Abbeyclock, Drawing Escapements and the BHI instructions manual), but the number of teeth I get is 26.25 for my train, though the book does not say whether the formula is for trains with BCTE trains or trains with a F wheel too. I made both calculations based on 3600 bph and none of the results gives 30 teeth which I think should be the right number for the Pendulum to move the pallets 60 times a minute.
I have seen instructions for the drop from 0.5° up to 1°, all of them considering the same 2° swing per beat and the same 3600 bph pendulum. It does not make sense TO ME. Can someone please point me in the right direction here?
Thank you a lot for your help and patience.

Sooth

NAWCC Member
I don't know any of the math involved, so I'll be no help there. I will say, however, that wooden escapements have particular and different requirements than metallic ones. There tends to be more friction, and a lot of the times, some alternate systems are used, I have seen wooden escapements that use Club Tooth escape wheels, trditional recoil, Grasshopper, etc. As far as the tooth counts, that will depend on your gear train, and desired pendulum length. There are some calculators available.

I would suggest you repost this, or cross-post this into the Clock Construction section.
https://mb.nawcc.org/forums/clock-construction.41/

FDelGreco

Moore NWCM Award
NAWCC Star Fellow
NAWCC Diamond Member
Here is the escape wheel page from the Thomas clock, a modern woodworks clock made popular in the 1960s.

Frank

Attachments

• 595.9 KB Views: 52
RULES & GUIDELINES