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roweenie · Post by **roweenie** » Sun Jun 26, 2016 12:40 am

I hate to break it to you, but using a tape measure to measure an accurate bore is basically useless.

The difference between .750 and .712 is .038. To give you a reference, .03125 is 1/32". I'd say it's pretty difficult to judge a difference this small, especially when using the wonky end of a tape measure (I don't even use the end of a tape measure when cutting two by fours for framing).

You can buy a digital caliper at Homey Depot for about $15 to $20 - it's a good investment, especially when measuring the bore of a horn you are trying to sell for over $5000.

When it comes to Martin tubas (among other things), Paul knows of what he speaks.

(BTW, from what I can see in your picture, the bore appears to look smaller than 3/4". Are you sure you are measuring the inside diameter of the tubing?)

eupher61 · Post by **eupher61** » Sun Jun 26, 2016 2:23 am

roweenie · Post by **roweenie** » Sun Jun 26, 2016 7:57 am

eupher61 wrote:Oh wow...I'm so embarrassed. 35 years as a professional player, teacher, and salesman, and I never knew how to measure bore until now. I'm so grateful for such helpful people.

After 35 years, if you're not using the proper tool, you still don't know how (kinda like trying to drill a hole with a circular saw.....)

roweenie · Post by **roweenie** » Sun Jun 26, 2016 9:07 am

58mark wrote:Another cool trick is that most brass in tuba slides is right about .019 to .020 thick, which means if you take the .750 measurement that it seems to be with the measuring tape on the outside, you can guess a .710-.712 inner diameter

It seems I'm not the only one who noticed this.

roweenie wrote: (BTW, from what I can see in your picture, the bore appears to look smaller than 3/4". Are you sure you are measuring the inside diameter of the tubing?)

My question was not facetious.

eupher61 · Post by **eupher61** » Sun Jun 26, 2016 12:45 pm

roweenie · Post by **roweenie** » Sun Jun 26, 2016 1:15 pm

Serious enough to tell a man who's spent the better part of his life researching those horns that he's wrong about his knowledge.

No need to feel sorry for me. I back up my statements with reliable data.

bort · Post by **bort** » Sun Jun 26, 2016 1:23 pm

Okay, you were warned, that's it! No ice cream!

roweenie · Post by **roweenie** » Sun Jun 26, 2016 1:32 pm

bort wrote:Okay, you were warned, that's it! No ice cream!

Can't you just send me to bed without dinner instead?

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