Official Luthiers Forum!

Owned and operated by Lance Kragenbrink
It is currently Thu Oct 31, 2024 6:31 pm


All times are UTC - 5 hours





Post new topic Reply to topic  [ 4 posts ] 
Author Message
PostPosted: Mon Apr 16, 2012 4:43 pm 
Offline
Walnut
Walnut

Joined: Mon Mar 05, 2012 3:54 pm
Posts: 4
First name: Robert
Last Name: McGeorge
City: Cincinnati
State: Ohio
Zip/Postal Code: 45239
Country: USA
Focus: Build
Status: Amateur
I'm considering making up some go-bar deck rods similar to the one's used by Harry Fleishman, the ones that are tubular and use a spring to exert downward pressure.

The only question I have is "How much pressure should the spring have?"

Obviously the one in a ball point is too light and the valve springs in the 350 are too heavy.

5 lbs? 10 lbs? More?

Thanks for any info.


Top
 Profile  
 
PostPosted: Mon Apr 16, 2012 8:21 pm 
Offline
Walnut
Walnut

Joined: Mon Mar 05, 2012 3:54 pm
Posts: 4
First name: Robert
Last Name: McGeorge
City: Cincinnati
State: Ohio
Zip/Postal Code: 45239
Country: USA
Focus: Build
Status: Amateur
That's the ticket.

I figured somehere in the 5 to 10 pound range would be adequate to keep parts secure, minimize deformity and prevent a starved joint.

I have access to a fairly wide assortment of springs for testing so next I'll be looking for the correct diameter, wire size, length, et cetera.

Thanks for the data.


Top
 Profile  
 
PostPosted: Mon Apr 30, 2012 11:32 pm 
Offline
Koa
Koa
User avatar

Joined: Thu Oct 22, 2009 1:59 am
Posts: 678
First name: Eric
Last Name: Reid
City: Ben Lomond
State: CA
Zip/Postal Code: 95005
Country: USA
Status: Professional
One of the things I like about spring loaded go-bars is that you can easily get a lot more clamping force. Mine top out at about 30 lbs each. This is enough to leave an indent on braces, but if you shape after gluing, that's not an issue. McMaster Carr part #9657K129 is a good spring. (1/2" OD, 2 1/2" length, .062" wire diameter, zinc plated high carbon steel) http://www.mcmaster.com/#compression-springs/=hc82ng. Here's a shot of the go-bars in use:
Attachment:
gobrshrnk.JPG


You'll probably get more responses if you post this question on the guitar building forum.


You do not have the required permissions to view the files attached to this post.


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 4 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 6 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Powered by phpBB® Forum Software © phpBB Group
phpBB customization services by 2by2host.com