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PassingInterest 02-29-2012 09:45 AM

The Curvomatic.




Rick's design used the PE 0.75 Cubic Foot Curved cabinet.
I don't have one, but I will try to make mine pretty close to theirs.
Here I experimented with curves and offsets until I found a look that I liked.


mjaudio 02-29-2012 10:23 AM

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Quote:
Originally Posted by PassingInterest View Post



I am shocked you can make such beautiful subs out of cardboard, your a true artist

mjaudio 02-29-2012 10:24 AM

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Oh wait, this isn't the mini-gun build!

I meant beautiful speakers.

I got confused which PI build I was following.

PassingInterest 03-01-2012 02:22 PM

Quote:
Originally Posted by mjaudio View Post

Oh wait, this isn't the mini-gun build!

I got confused which PI build I was following.

Haha! I just hope I don't get them confused when I try to install the drivers. Just kidding.

PassingInterest 03-01-2012 02:46 PM

At first I thought I might try something a bit more wavy for the cabinet sides, but I decided to go the easy route for this build and just do a simple curve.

I cut a curved form.




Then duplicated it.





The layout.
Draw a line tangent to the curve at both ends. (All this is in the instructions at the Curvomatic site in both video and text).



Draw a line between 20-30 degrees from the previous line (I went with 25).



The reason for the second line is to position the straps at the best location for pulling at the angle that works best.

I now know the length I need for the 2x4s the forms mount to.




I was out of 2x4 stock, so I ripped a 2x8.
Round the ends so the straps can slide easily as needed.
I doubted the strength of 1.5" thick pine under pressure, but I wanted to try it anyway.




Forms ready for the first dry run.




Secure the bottom cheek.




The pine flexed rather a lot, but I still got a nearly perfect front edge curve.
The top cheek needed a little repositioning and the pine needs to be made stronger, because it is too thin for this much pressure.




The trailing edge needs work. I need to add another section or two on the top cheek.




This was my first dry run test (no glue) and I am pleased with what I see.
After some adjustments, I will try again tomorrow.

Jstslamd 03-01-2012 03:18 PM

Looking good

PassingInterest 03-03-2012 02:52 PM

Quote:
Originally Posted by Jstslamd View Post

Looking good

Thanks, man.


The pine 2x that bowed under pressure--I made them into I-beams and they're pretty solid now. I know it's overkill, but I wanted to use up some plywood scraps I had.




Here's the first glue-up and it's looking good. I used a stack of three 1/4" MDF.




mjaudio 03-03-2012 03:04 PM

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I can't even get one project started and I think you have 3 going on at the same time. I get so exhausted watching your progress that I am too tired to start up my own

Your builds are world class Dan! Always my favorite threads to follow.

lowpolyjoe 03-03-2012 04:32 PM

Even your clamping rigs are a thing of beauty. Great demo for the Curvomatic. Great stuff!

All this work going on and your shop still looks tidy! My garage is an absolute pig sty during a build (and usually for a few weeks afterwards)

PassingInterest 03-03-2012 05:08 PM

Thanks guys.
MJAudio--You're right. I actually do have three different projects going on at the same time in the garage.

PassingInterest 03-07-2012 11:32 AM

I wondered how much spring-back I would get, once the straps were removed.
It didn't move much at all.


PassingInterest 03-08-2012 09:02 AM

For the first curved panel, I wrestled a bit with positioning the top cheek along the front edge of the panel. Tightening the straps pushed the top cheek back from the edge. I went back and forth a few times before I got it right--loosen the straps, realign, re-tighten, oops, loosen again. I got it right on the fourth try. With a little more experience, I'm sure I could get it right on the first try.

But, I tried a slightly different approach with the second panel.
I began by applying clamps on the front edge to lock everything in place.




Then I tightened the straps.
Tightening the straps is easier if you push downward to tighten, because you can put your body weight into it. It's pretty effortless, really.


tuxedocivic 03-08-2012 09:09 AM

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Very cool.

Watching your builds makes me want to build. Gotta do something.

PassingInterest 03-08-2012 01:59 PM

Thanks, TC.

Encouraged by how well the second panel glue-up went, I decided to try applying the veneer at the same time that I glue-up the third panel.
It will be a neat trick if I can shape a curved panel and veneer it in a single step.

Again, I'm gluing three 1/4" MDF panels, using Titebond II.
Since I've had some trouble with water-based glues wrinkling the veneer in the past, I decided to use some 60 minute epoxy for the veneer on this panel.

Later, I will experiment with other glues.

Some waxed paper acts as a barrier to prevent glue seepage from getting on the top MDF sheet, permanently gluing it over the veneer.




The top MDF sheet is 1/8" thick. It was a pallet protector. I was in the right place at the right time and Home Depot let me have it for 51 cents.




Again, I clamped the front edge first to keep things aligned and then applied pressure with the straps.


BeerParty 03-08-2012 02:44 PM

Quote:
Originally Posted by PassingInterest View Post

The top MDF sheet is 1/8" thick. It was a pallet protector. I was in the right place at the right time and Home Depot let me have it for 51 cents.

Alright, where is the 'green-with-envy' emoticon?

Looking good PI, I am looking forward to see how your new 'veneer press' measures up to your T100*.

* for those who didn't read PI's previous builds, he once used his Toyota T100 pickup as a veneer press.

PassingInterest 03-09-2012 11:01 AM

You're a funny guy, Chris! Thanks.

I looked really close and I don't see any veneer bubbles.
I believe I got good adhesion for the veneer and curved the panels at the same time. Obviously, I haven't sanded yet, but this looks very good to me.

I over-sized the panels a bit, but it shouldn't be a problem at all.


Square88 03-10-2012 07:45 PM

Looking great PI. I really like reading your threads. They are always making me wish I had more woodworking tools and time to use them.

PassingInterest 03-20-2012 10:32 AM

Thanks, Square88!
I needed to take a week off.

Found this waiting for me in the garage. Soon after, he wasn't feeling very well.




Now for the tops and bottoms.














And some braces.




PassingInterest 03-20-2012 01:27 PM




Aah! Clamps at last!
PL Premium construction adhesive was used on the vertical braces, TiteBond II elsewhere and 18 gauge brads were used to pin it.


tuxedocivic 03-20-2012 02:21 PM

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Ahhh, I was going through withdrawl. No more breaks

johngalt47 03-22-2012 09:48 AM

PI,
What is the volume of the box?

PassingInterest 03-22-2012 12:58 PM

Thanks, TC!
JohnGalt47--It should be real close to 0.75 cubic feet.

I just got back in town and should be back on this project tomorrow.

PassingInterest 03-23-2012 09:59 AM

Clamps off.








Trim a little off.


dbldare 03-23-2012 10:34 AM

PI - Too sweet as always!

You should name these after your new 8 legged "friend". Widow Maker comes to mind.


dbl

PassingInterest 03-23-2012 10:59 AM

Quote:
Originally Posted by dbldare View Post

PI - Too sweet as always!

You should name these after your new 8 legged "friend". Widow Maker comes to mind.


dbl

Great name! I may have to use it. And thanks for the compliment.

BP1Fanatic 03-23-2012 11:46 AM

Quote:
Originally Posted by mjaudio View Post

i can't even get one project started and i think you have 3 going on at the same time. I get so exhausted watching your progress that i am too tired to start up my own:d

your builds are world class dan! Always my favorite threads to follow.

exactly, lol!!!

PassingInterest 03-23-2012 12:51 PM

BP1Fanatic--Thanks!




mjaudio 03-23-2012 01:54 PM

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That veneer is so good looking, you have an excellent sense of what looks good.

BeerParty 03-23-2012 02:07 PM

Quote:
Originally Posted by PassingInterest View Post


Nice! It looks like those Curvomatic pre-curved sides made things much easier at this stage of the build.

mjaudio 03-23-2012 02:17 PM

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Your right, that Curvomatic is one slick tool. Your user name being BeerParty I have a natural inclination to agree with anything you say anyway

Looks like PassingInterest is going to cost me more money in tools for a Curvomatic. He just has a way of showing how to properly use a tool and making me want one. Now if I only had his skills


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