Dual Loaded Table Tuba by a Teenager

[bassmonster]

You mentioned a fear of warped panels earlier. I think a bigger fear should be making sure they are all the same width so rip all your panels at once. You can store them flat on the floor with weight on them until you need to cut. Plan which panels will be cut from each piece of stock and label each and all as work progresses.

Unfortunately I didn't have the time frame to cut all the pieces at once today. But I do store the plywood flat on the floor with a couple of sledgehammers in the middle.

[bassmonster]

This morning I cut out the access panel, and cut panels 1 and 2. I also attached panel 1. I have a few things to say about PL- it's messy, it's messy, aaaand, it's messy. I was SUPER obsessive about making sure I had ample PL on the joints. The squeeze-out is massive! Oh well. One of my favorite BFM quotes of all time is from bgavin in myn's Tuba HT build thread.

Squeeze-out is your friend. He is telling you "no leaks here".

Access panel cut:



Panel 1 attached:



Definitely will not be winning any Harleys for the state of my garage.

Panel 2 will be attached later this afternoon.

[Michael Ewald Hansen]

Excellent you started building! Looking forward to following it

If you can muster the cash for it, i'd say buy a couple of one-handed clamps.. Sure made my life a lot easier!

[subharmonic]

Seriously, it should be in the horn commandsments by Bill: Thou shalt rip all thy sides at once. Make time to do it. Figure out how many linear inches of side you need total, and DO IT! ( in a rob schnieder voice)

In 2007 at CEDIA I was able to sit in on a Dr. Toole seminar, most I ever learned about sound in one sitting. If you can ever find a seminar by him, DO IT!

[bassmonster]

Seriously, it should be in the horn commandsments by Bill: Thou shalt rip all thy sides at once.

IITP actually. I wish I could. I'm scared that the same thing will happen to me as it has to many: have not all the panels the same width when you go to attach the last side. Then begins the sanding...

In 2007 at CEDIA I was able to sit in on a Dr. Toole seminar, most I ever learned about sound in one sitting. If you can ever find a seminar by him, DO IT!

His book is fantastic and very detailed, but it sometimes goes quite over my head.

[bassmonster]

Attached Panel 2 tonight.



Won't be able to work on it more until probably this weekend due to time restraints and going back to school.

Pic was taken a couple hours into the drying process, hence no plywood braces. It's cold outside, hence the work lamp to help the PL.

Edit: I brought it inside the living room much to the chagrin of my parents

[Gregory East]

PL doesn't dry as much as cure by absorbing moisture and gassing off nasties. I take the handling instructions seriously as I already got sensitised to acrylates. You really don't want that in your C.V. trust me.

[bassmonster]

PL doesn't dry as much as cure by absorbing moisture and gassing off nasties. I take the handling instructions seriously as I already got sensitised to acrylates. You really don't want that in your C.V. trust me.

It does irritate my nasal passages and make my sinuses swell up a little bit, but it could just be all the sawdust and other stuff floating around in my garage. Will the "fumes" harm animals or humans? I don't want to kill my pets...

EDIT: I got concerned after reading the PL tube, and moved the whole thing in an unused room upstairs. Thank you Mr. East for bringing up a potential hazard, or at the least an irritant.

[Gregory East]

Read the datasheet on PL. Our stuff is similar but different but surely not what you want to breathe in any more than your pets or parents. As someone who came off very second hand from exposure to sensitizing chemicals I encourage you to take the warnings seriously.

[bassmonster]

I have moved the cab to a safe, isolated place. Thanks again for the info.

INTENTIONAL MISUSE BY DELIBERATELY INHALING CONTENTS MAY BE HARMFUL OR FATAL.

Yikes. Point taken.

[subharmonic]

IITP actually. I wish I could. I'm scared that the same thing will happen to me as it has to many: have not all the panels the same width when you go to attach the last side. Then begins the sanding...

I am having trouble understanding why you can't? Also doing it this way prevents not having all the panels the same width, that is why you do it.

Rough cut all your panels to about 1/2"-1" oversized (29" panels, roughcut to 30" with the circ saw, just be square) and run them through the table saw. It will be waaaaaaaaaaay more accurate then a circular saw and rasp. EG if you have 2 panels up. That means you have 127" of linear panels left to cut, that is 10' 7" or a little over 2 1/2 strips of ply cutting into the 4' side. Easy peazy, get some help from your neighbor/parent if needed and knock it out in 5-10 minutes. The fence on that saw looks like if should go plenty wide, uuhhh actually how wide are you building.

His book is fantastic and very detailed, but it sometimes goes quite over my head.

Don't feel bad, I haven't finished that one yet and there is a lot I have to go back and look over try to wrap my head around. Reread after a year and you will get it more. When I first went to that seminar I had never seen a SPL chart or understood that a $200 and $20k speaker could actually sound very similar. Of course it was an intro course, considering the time we were having in Denver the night before that was about the only thing that could have kept me awake the next morning.

As for this PL fume thing. I have never seen posts on it being an issue before. I have never had an issue with it, my cats are fine, my wife is fine (even when she was prego and pregos can smell farts from 2 floors away), my kids fine, my dad helped me on my first build he's fine. Seriously they need to put that warning on everything, which is stupid cause then you never know when to heed the warning like me and the truckbed liner incident on my T60 build. Or road reports when it is winter, up here we would never leave our houses from Nov to March if we never travelled during no travel advisories. Then the authorities freak out when there are people stranded since people didn't listen to the same bullsh:t told to them for the last 4 months. Basically just use common sense.

[bassmonster]

Panels 1 and 2 are already attached, I cannot go back on those. I will cut all the rest of the panels in one session, using a rasp to file them down at the end if need be, which I'm not looking forward to, but it's better than closing up the cab and having a leak. I've used the table saw for all the panels so far, and it's cut the angles dead on which is nice. I'm building 24" wide, I just realized I forgot to put that in the intro post.


Thanks everyone for the warnings about the PL fumes, although it might be an issue or a non-issue, the cab is drying in an isolated room where there is little chance of fumes migrating throughout the house.

[Bruce Weldy]

I've used the table saw for all the panels so far, and it's cut the angles dead on which is nice.

If you are using a table saw, why in the world would you ever need a rasp?

[subharmonic]

I've used the table saw for all the panels so far, and it's cut the angles dead on which is nice.

If you are using a table saw, why in the world would you ever need a rasp?

Remember we are talking width not length of the panels. If your doing a 24" wide outer TT. Lock the table at a solid 23" and rip all the linear panel you need. No rasp, this isn't drywall. Are you following what we are saying?

[bassmonster]

Yes, thank you for the advice. I understand what you are saying, when I get to cutting the rest of the panels I will lock it at 23" as I have done with the first two panels.

The only time I have used a rasp so far was since I cut the side panels with a circular saw (the table saw's rip fence didn't extend the width of the plywood) it was not totally even, so I used a rasp to smooth it out a little since I don't own a planer. I don't intend to use the rasp any more though as the table saw is spot-on accurate. Cutting the panels to a T and finding they fit perfectly on the drawn horn path is quite satisfying.