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

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Broach table

5 sided cutting broaches, in Stubbs wire gauge at about 10mm from the shoulder. Metric equivalents are approximate. 0.01 mm taper (the diameter decreases 1mm per 100mm of length).

No.	Size mm	Length mm	M&P number
80	0.33	31	0547 003315
78	0.38	31	0547 003815
76	0.45	36	0547 004515
74	0.55	40	0547 005515
72	0.61	40	0547 006115
70	0.68	40	0547 006815
68	0.76	44	0547 007615
66	0.81	44	0547 008115
64	0.88	48	0547 008815
62	0.94	48	0547 009415
60	1.00	48	0547 010015
58	1.04	52	0547 010415
56	1.14	52	0547 011415
54	1.39	56	0547 013915
52	1.60	62	0547 016015
50	1.75	62	0547 017515
48	1.90	65	0547 019015
46	2.00	70	0547 020015
44	2.15	70	0547 021515
42	2.33	75	0547 023315
40	2.46	75	0547 024615
38	2.56	75	0547 025615
36	2.69	80	0547 026915
34	2.79	80	0547 027915
32	2.92	83	0547 029215
30	3.22	86	0547 032215
28	3.53	90	0547 035315
26	3.70	95	0547 037015
24	3.83	95	0547 038315
22	3.98	95	0547 039815
20	4.08	100	0547 040815
18	4.26	100	0547 042615
16	4.44	100	0547 044415
14	4.57	100	0547 045715
12	4.70	100	0547 047015
10	4.85	105	0547 048515
8	5.00	105	0547 050015
6	5.10	105	0547 051015
4	5.25	105	0547 052515
2	5.56	105	0547 055615
A	5.94	105	0547 059415
B	6.04	110	0547 060415
C	6.14	110	0547 061415
D	6.24	110	0547 062415
E	6.35	110	0547 063515
F	6.52	110	0547 065215
G	6.62	115	0547 066215
H	6.75	120	0547 067515
I	6.90	120	0547 069015
J	7.03	120	0547 070315
K	7.13	120	0547 071315
L	7.36	120	0547 073615
M	7.49	120	0547 074915
N	7.67	120	0547 076715
O	8.02	125	0547 080215
P	8.20	125	0547 082015
Q	8.43	125	0547 084315
R	8.61	130	0547 086115
S	8.83	130	0547 088315
T	9.09	130	0547 090915
U	9.34	130	0547 093415
V	9.57	130	0547 095715
W	9.80	130	0547 098015
X	10.08	135	0547 100815
Y	10.26	135	0547 102615
Z	10.48	135	0547 104815