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Marcos

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« on: February 15, 2007, 03:50 PM »

Sorry if this has been discussed elsewhere (please post link, still not having luck w/search engine). How do you check for out of round? thnx.


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- Marcos
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Magnus

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Re: Checking "Out-Of-Round"

« Reply #1 on: February 16, 2007, 05:46 AM »

Remove the heads, measure from bearing to bearing edge acoss the drum. Take two measurements at 90 degrees. These measurements should be very nearly identical.

/Magnus


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Louis

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Re: Checking "Out-Of-Round"

« Reply #2 on: February 16, 2007, 08:33 PM »

Two measurements will not always tell you the truth. A minumum of three will be required. It is possible to take two 90 degree measurements of an oval and they will be the same. You can also take two measurements of a square and they will be the same. A large inside caliper is fairly cheap and will allow you to take many measurements in a short time.


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rca

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Re: Checking "Out-Of-Round"

« Reply #3 on: February 16, 2007, 09:05 PM »

If the head moves freely without binding, then its round enough to seat properly. Which is all I care about. That is how I test used drums before I buy.


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Louis

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Re: Checking "Out-Of-Round"

« Reply #4 on: February 16, 2007, 09:12 PM »

Quote from: rca on February 16, 2007, 09:05 PM

If the head moves freely without binding, then its round enough to seat properly.

That is a pretty geasy to use indicator or roundness but the drum can still be out of round quite a bit and pass this test. Nevertheless, I do that test each time I rehead a drum.


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Marcos

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Re: Checking "Out-Of-Round"

« Reply #5 on: February 17, 2007, 11:57 AM »

What are the tolerances I should look for? What calipers would you suggest. Does out-of-round occur only from trauma or are there other factors such as age, harsh environments?


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- Marcos
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Louis

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Re: Checking "Out-Of-Round"

« Reply #6 on: February 17, 2007, 06:45 PM »

Personally I think exact roundness is highly over rated, unless you are buying drums and try to use it as a bargaining point. Think back to the oddly shaped drums that looked as if you mashed them. Those drums were seriously out of round and still sounded good. I believe as long as the head goes on easily without binding the shell is ok. Out-of-roundness may an indication of more serious problems. I would check for delaminating of the plies or physical abuse. My personal theory is don't obsess about things, just play and have fun.


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Paicey

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Re: Checking "Out-Of-Round"

« Reply #7 on: February 18, 2007, 11:40 AM »

Ive got a yamaha 13'' snare that looks perfect until you put the head on. Its just (a tad) snug. Ive NEVER gone through snare heads as quickly as i have with this drum. Also the coating on Aquarian heads has been coming off in hunks for my last few head changes. Ive NEVER experienced this either with snare heads. The only thing i can attribute this to is the slight out of roundness.

When the head is on you can see the slight gap difference around the circumference of head and hoop. Anyone else been having problems with Aquarian heads?. It has to be this drum?.


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Magnus

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Re: Checking "Out-Of-Round"

« Reply #8 on: February 19, 2007, 06:10 AM »

Quote from: Marcos on February 17, 2007, 11:57 AM

What are the tolerances I should look for? What calipers would you suggest. Does out-of-round occur only from trauma or are there other factors such as age, harsh environments?

On his drum tuning dvd Bob Gatzen says that a tolerance of 1/16 inch is OK, but that a drum which is 1/8 inch out-of-round will never tune accurately. I had an out-of-round issue with a Sonor S-Class Tom, which was some 2 millimeters out-of-round. I sent it back and received a replacement.

A shell can be out-of-round straight from the factory. My S-Class shell was.

/Magnus


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drummercous

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Re: Checking "Out-Of-Round"

« Reply #9 on: February 19, 2007, 05:19 PM »

How timely... theres an article in the latest MD magazine that addresses this very issue, with nice pictures to boot. Page 16 of the April 2007 issue.