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| Author: | Robbie_McD [ Mon Apr 05, 2010 12:24 am ] |
| Post subject: | Alternative go-bar rods |
I was watching a Romanillos video a while back and noticed he was using a cool go-bar rod that was not a bent rod, but a spring-loaded device.... It appeared to be a 20" x 3/4" piece of PVC, with a 5/8" wooden dowel, sharpened to a 3/8" point with a cork tip (like a pool queue) I like this idea as it gives you straight down clamping force. Inside the PVC rod I imagine a 8" x 5/8" compression spring giving +/- 10lbs compression at 4" deflection. However, I have been unable to find such a spring -a local shop would make them up for $20/ea....uh......nope..... Any ideas where I might find a common spring for such an application? Thanks!!!!!! Rob |
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| Author: | Michael.N. [ Mon Apr 05, 2010 1:52 am ] |
| Post subject: | Re: Alternative go-bar rods |
The springs in my set up are 2.5 " long by 3/8 th's - wire being 1.25 mm gauge. Rods are a hardwood dowell at 20" long. The rods do flex a little but not significantly - they certainly work for me. The springs were obtained from a specialist engineering suppliers - probably not much use to you as I'm UK based. Nowhere near $20 each. |
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| Author: | JohnAbercrombie [ Mon Apr 05, 2010 2:13 am ] |
| Post subject: | Re: Alternative go-bar rods |
Rob- McMasterCarr is one place to look- they have all kinds of springs (plus millions of other items). Make sure you specify that you are a 'business' when dealing with them from Canada (unless they've changed their policies in the past couple of years). As you probably know, the force 'exerted' by a compression spring is not constant (Hooke's Law?), but depends on the amount of compression. One of the appeals of go-bars is that the force is more-or-less constant after slight deflection. But those vertical spring-loaded bars do look appealing. Cheers John |
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| Author: | senunkan [ Mon Apr 05, 2010 2:26 am ] |
| Post subject: | Re: Alternative go-bar rods |
Check out Waddy's tutorial on how to make the spring loaded go-bar http://luthiersforum.com/forum/viewtopic.php?f=10117&t=15834 Maybe you can check out those motorbike repair shops, I manage to find some 2nd hand parts springs at a motorbike repair shop. It's really cheap costing abt 50 cts per piece for a size of 80 mm long with 10mm diameter. |
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| Author: | Tim L [ Mon Apr 05, 2010 9:32 am ] |
| Post subject: | Re: Alternative go-bar rods |
You might check MSC also. I was just looking last week for smaller springs to make the same thing for inside the box. They have several pages of springs to sort through. Tim |
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| Author: | WaddyThomson [ Mon Apr 05, 2010 9:36 am ] |
| Post subject: | Re: Alternative go-bar rods |
When you make spring loaded bars, you do have to pay attention to the sweet range of the spring that suits the pressure you are looking for. I found that in the case of the spring I used, it worked best at about 3/4 compression, and without changing the height of my go bar deck, but using an insert in the end of my rods, I can get a pressure range in the 7 - 9 lb area for gluing braces and the same for gluing backs with the inserts removed. You could do the same by changing the height of the deck, or using a raised base when gluing braces. But, since my go-bar deck is attached to the solera, when I need it, I just keep it the same all the time. It's simpler, to me. Gluing braces, with inserts: Attachment: P1030010 (Large).JPG Gluing back, without inserts: Attachment: P1030182 (Large).JPG
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