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Gobar alternative (Read 2397 times)
Erfunden
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Las Cruces, New Mexico
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Gobar alternative
Dec 4th, 2007 at 12:52pm
 
My papa and I have started building our first ukuleles together and started gluing down the bracing on Sunday.

The Ukulele Construction Manuel calls for gobars on a gobar deck and I can see why.  They look like they're pretty handy for holding all those pieces down in a tight space.

But we didn't have any gobars and didn't know where to get them.  So we improvised and made a  kind of extension clamp out of some scrap wood and machine screws.

They're about 12 inches long which gives us plenty of room to work under the gobar deck we built.  You unscrew them with a wrench to extend them.  We cut slots on the opposite end so they would hold the braces nicely.

They probably aren't as quick or easy to use as a real gobar but they do the job and they were cheap and easy to make (I think we churned out 40 in less than an hour).  The only problem we've had with them is that I've stripped the threading on a couple by trying to apply too much pressure.

You can view a picture of them here --> http://i37.photobucket.com/albums/e57/Bohnhoff/uke/gobar.jpg
And a picture of them in use here --> http://i37.photobucket.com/albums/e57/Bohnhoff/uke/liltithonus5.jpg
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unkabob
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I love YaBB 1G - SP1!

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Re: Gobar alternative
Reply #1 - Dec 4th, 2007 at 1:36pm
 
Erfunden:
I used a simpler system than yours. I cut wood, much like yours and wedged blocks of polyether foam where you used machine screws. The foam was packing from a new printer and seems slow in recovering its elasticity. It may only be practical to use the foam once but its free.

Bob (Like your pictures.)
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Re: Gobar alternative
Reply #2 - Dec 4th, 2007 at 5:22pm
 
lol!  We thought of using foam too before we settled on our design but we couldn't think of where we could get our hands on any.

In hind sight, I know of a gymnastics school nearby that always have cubes of old foam out by the dumpster.  They might have worked.

We also thought of making them spring loaded with springs salvaged from retractable pens.  But it was cheaper to buy some screws than 30 pens.  But they would have been closer to what I'm guessing gobars are like, based off the description in the book.
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konacat
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Re: Gobar alternative
Reply #3 - Dec 5th, 2007 at 7:23am
 
I can’t see the photos from work but do have something to add. A go bar deck is just a bottom surface and a top surface that supports an object to create clamping pressure by deflection (bending or spring action). My current go bar uses either fiberglass rods or different sized wooden dowels. My deck is adjustable so I can vary the amount of pressure by adjusting the deck top or by choosing rods with different properties.

Here is a link to the OLF that has several decks people use. There is certainly a variety of styles and deflection devices. Some where I saw a cool looking setup with PVC pipe and wooden dowels. The pipe was pinned at the top to hold a spring below it. A slot placed on the side of the PVC. A wooden dowel was placed into the PVC pipe and placed against the spring. A pin was then placed into the dowel through the slot. The result was like a pogo stick you could compress the spring by pushing down until the pinned dowel reached the top of the slot. It would release downwards upon removal until it reached the bottom of the slot. If I can find a photo I will post it.

The truth is that any material that will provide consistent pressure against your object will work as long as it doesn’t break itself or the object.



http://www.luthiersforum.com/forum/forum_posts.asp?TID=13216&KW=go+bar+deck#foru...

Philip   
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Re: Gobar alternative
Reply #4 - Dec 5th, 2007 at 9:33am
 
Good link!  I hadn't thought about gobars bending to do their job.
Wouldn't that cause problems with the gobars pushing whatever they were gluing out of place?
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konacat
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Re: Gobar alternative
Reply #5 - Dec 5th, 2007 at 1:47pm
 
No.    You place the bottom of your rod or stick against your object and then bend placing the top of the rod against the top of the deck. You should think of a bow with equal pressure on each end with no side to side pressure. The first time I used my deck there was some minor movement. Once I adjusted the deck size and had some practice all has been well.

I found the photo of the spring loaded PVC rods. Here is a link and the photo is at the bottom. It looks interesting enough to use as a project in the future.

Philip


http://www.luthiersforum.com/forum/forum_posts.asp?TID=13591&KW=go+bar+deck#foru...
http://www.luthiersforum.com/forum/forum_posts.asp?TID=13487&KW=go+bar+deck#foru...
Look at this gobar deck at the Gibson factory in 1997. Looks like they are using springloaded rods.
http://www.gibson.com/products/montana/tour/tour1a.html

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