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Clocks, Watches/Hermle 340-020 movement balance wheel

Expert: William J Perkins - 3/7/2008

Question
I'm a clockmaker wannabe, but I try not to do too much damage to the clocks I have. I have a Howard Miller Mantle clock with a Hermle 340-020 movement in it. I have tried to read my TimeTrax guide book to find out what the rate is but I must be reading it wrong. I think the book says the balance wheel speed is 10,080 rph, but that doesn't seem to work. Am I just reading it wrong or is the balance wheel so in need of cleaning that it just can't get going that fast?
Thanks, Paul.

Answer
I am unable to help you on this. I do not recall the rph for the Hermle floating balance units nor can I find it listed anywhere. During my years of servicing these clocks I found it far more efficient and cost effective to replace most Hermle movements with a new one. The customer for sure ends up with a clock superior to when it was new and, generally, at a lesser cost than a repair job. Sorry WJP

Questioner's Rating

Rating(1-10)	Knowledgeability = 5	Clarity of Response = 10	Politeness = 10
Comment	Thqat was a prompt, but not a good answer. The Hermle 340-020 is a standard movement. I figured the answer would be easy to come by. I have contact a Hermle movement retailer for the answer.