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Instructor: Al Dodson

Workshop Fee:
NAWCC Member

$1320 Early Bird (before 9/26/2014)

$1420 Regular

Non Member

$1400 Early Bird (before 9/26/2014)

$1500 Regular

Lab Fee: $110.00

Click Here to Register Online


School of Horology
514 Poplar Street
Columbia, PA 17512
Phone: 717-684-8261 ext.237

Basic Clock Repairs

This two week course covers some of the most common repairs encountered by the clockmaker; damaged wheels, worn pinions, broken ratchets and many others. We will begin to acquire the knowledge and skills needed to accomplish these repairs.  We will accomplish these tasks using both traditional hand techniques and using the Sherline machines to aid in these repairs. There are a wide variety of tasks but all are accomplished with the tools we have already used; saws, files, drills, the lathe and milling machine. In addition, we will work extensively with mainsprings and mainspring barrels. We will also continue to fabricate some of the tools we will use in making repairs. There is much to accomplish so this will be a very hands on class. 

Upon completing the course the student should be able to:

  • Bush a clock using the bushing machine
  • Bush a clock using the milling machine
  • Bush a clock using custom made reamers and the drill press
  • Bush a clock using hand tools
  • Repivot an arbor with a broken pivot
  • Repair worn pivots to prepare them for polishing
  • Polish pivots using abrasives
  • Polish pivots using a burnisher
  • Straighten bent gear teeth
  • Replace gear teeth in a wheel
  • Replace gear teeth in a mainspring barrel
  • Replace a damaged barrel hook
  • Bush a mainspring barrel
  • Repair or replace a damaged ratchet
  • Repair lantern pinions
  • Repair a mainspring with a broken end
  • Repair, replace, or fabricate a suspension spring
  • Repair or replace hands


Prerequisites–WS-204 Introduction to Machine Tools and Materials, or consent of the instructor. This is a combination of WS-305 and WS-405 into a two week course.

Tools Student Required to Bring:


The two week workshop will be held at the NAWCC School of Horology on Monday-Friday (half day second Friday), between the hours of 8:30 and 5:00. Those students wishing to stay Friday afternoon may use the time to practice skills learned during the course. This includes 1 hour for lunch each day.



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