I'd like to measure my C1 brake drums myself to see if they have enough material left to stand another turning. I can't find anybody local that I trust to do it. Besides, the going price is $12 per drum. Can I buy a micrometer for around $48? What kind of caliper is used for this measurement? Where can I buy one?
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Re: "Miking" Brake Drums - How To?
Generally, shops that turn drums and rotors have the proper measuring equipment to accurately measure both. Last time I bought a micrometer was in 1975, and it cost a lot more than $48 then. BTW, $12 to turn a drum is pretty reasonable. I just paid $10 ea to get some rotors turned last weekend and considered it a bargain compared to the cost of new rotors. -
Re: "Miking" Brake Drums - How To?
Most places I have had drums turned will not turn it if there is not enough metal. I do not recall them charging if it was not turned.Comment
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Re: "Miking" Brake Drums - How To?
Chris:
There is a special inside mike used to mike a drum. Its not incredibly expensive as far as machinist tools go, but its a bit more than 48.00! On the other hand, you can also use a set of inside micrometers to measure the drum. This requires "feel" though to get close. This is what we use on the inside of bores while we are boring them to check measurement. Once we get the mike set, we also use a standard micrometer to verify the reading. Neither approach is cheap for a one-off use.
If I were you, call an professional engine rebuilding shop. They will have the equipment to do this, and its a 30 second operation to check the drum (usually no charge) and not too terribly expensive to cut the drum. We used to charge 7.50 a drum but that was in 1987. Figure on 12-15.00 now I would think.
No shop will turn the drum if it is at or below minimum specification (also in the books they use)
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