Repairing Your Own Clocks

	Repairing Your Own Clocks By Mervyn Passmore	© Copyright Mervyn Passmore 2005 M&P Home


	Copyright notice
	Contents
	Introduction
	Which clock to begin on?
	Hand Removal
	Pin and Collet
	Hand nut
	Friction fitting
	Removing the dial
	Letting down mainsprings
	To strip or not to strip?
	Cleaning without stripping down
	Stripping down the movement
	Repairs
	Pivots
	Bushing:
	Choosing cutting broaches
	Re-facing the pallets
	Checking the crutch and yoke
	The Platform Escapement
	Ordering a replacement platform
	Fitting a new platform
	Broken and Missing Pieces
	Broken teeth
	Suspensions.
	Clock chain
	Clock glass
	Mainsprings
	Pendulums
	Gong rods
	Winding keys
	Cleaning the dismantled movement
	Pegging out
	Using an ultrasonic tank
	Lacquering
	Re-assembly
	Lubrication
	Re-assembling and Setting up
	Setting up
	Siting
	Regulation
	Tips, Hints & Helps
	Bluing
	Silver soldering
	Soft soldering
	Dial Silvering
	Splicing 30 hour rope
	Black Marble or slate cases
	Tables
	Broach table
	Train count table

Home

Train count table

You can use this chart to calculate the length of missing pendulums, and for calculating tooth counts etc. The pendulum length is from the top of the suspension (the pivot point) to the centre of mass of the bob.

A= Centre Wheel

B= Third Wheel

C= Third Wheel Pinion

D= Escape wheel

E= Escape Wheel Pinion

F= Vibrations per minute

G= Pendulum lenght in inches

H= Pendulum length in mm

A	B	C	D	E	F	G	H
128	120	16	30	16	60.0	39.14	994.2
112	105	14	30	14	60.0	39.14	994.2
96	90	12	30	12	60.0	39.14	994.2
80	75	10	30	10	60.0	39.14	994.2
64	60	8	30	8	60.0	39.14	994.2
68	64	8	30	8	68.0	30.49	774.4
70	64	8	30	8	70.0	28.75	730.3
72	64	8	30	8	72.0	27.17	690.1
75	60	8	32	8	75.0	25.05	636.3
72	65	8	32	8	78.0	23.15	588.0
75	64	8	32	8	80.0	22.01	559.1
84	64	8	30	8	84.0	19.97	507.2
86	64	8	30	8	86.0	19.06	484.1
88	64	8	30	8	88.0	18.19	462.0
84	78	7	24	7	89.1	17.72	450.1
80	72	8	30	8	90.0	17.39	441.7
84	78	7	21	7	93.6	16.08	408.4
94	64	8	30	8	94.0	15.94	404.9
84	78	8	28	8	95.5	15.45	392.4
108	100	12	32	10	96.0	15.28	388.1
84	84	9	30	8	98.0	14.66	372.4
84	78	7	22	7	98.0	14.66	372.4
84	78	8	29	8	98.9	14.41	366.0
80	80	8	30	8	100.0	14.09	357.9
85	72	8	32	8	102.0	13.54	343.9
84	78	8	30	8	102.4	13.44	341.4
84	78	7	23	7	102.5	13.40	340.4
105	100	10	30	10	105.0	12.78	324.6
84	78	8	31	8	105.8	12.59	319.8
84	78	7	24	7	107.0	12.30	312.4
96	72	8	30	8	108.0	12.08	306.8
84	78	8	32	8	109.2	11.82	300.2
88	80	8	30	8	110.0	11.64	295.7
84	77	7	25	7	110.0	11.64	295.7
84	78	7	25	7	111.4	11.35	288.3
84	80	8	32	8	112.0	11.22	285.0
84	78	8	33	8	112.2	11.15	283.2
96	76	8	30	8	114.0	10.82	274.8
115	100	10	30	10	115.0	10.65	270.5
84	78	7	26	7	115.9	10.49	266.4
96	80	8	30	8	120.0	9.78	248.4
84	70	7	30	7	120.0	9.78	248.4
84	78	7	27	7	120.3	9.73	247.1
90	84	8	31	8	122.0	9.46	240.3
84	78	7	28	7	124.8	9.02	229.1
100	80	8	30	8	125.0	9.01	228.9
90	84	8	32	8	126.0	8.87	225.3
100	96	10	40	10	128.0	8.59	218.2
84	78	7	29	7	129.3	8.42	213.9
100	78	8	32	8	130.0	8.34	211.8
84	77	7	30	7	132.0	8.08	205.2
84	78	7	30	7	133.7	7.90	200.7
90	90	8	32	8	135.0	7.73	196.3
84	78	7	31	7	138.2	7.38	187.5