Official Luthiers Forum!

Owned and operated by Lance Kragenbrink
It is currently Sun Feb 25, 2024 6:11 am


All times are UTC - 5 hours





Post new topic Reply to topic  [ 9 posts ] 
Author Message
PostPosted: Wed Jul 12, 2023 8:43 pm 
Offline
Brazilian Rosewood
Brazilian Rosewood
User avatar

Joined: Mon Jul 27, 2015 8:21 am
Posts: 3224
First name: Brad
Last Name: Combs
Focus: Build
Status: Amateur
Hey folks,

I'm not sure who is still paying attention down here in this forum, but.... :)

I'm spending some cycles on learning how to create a side profile template. I see these from LMI, SM, etc... and many plans have them as well. The profile of the unbent side where along the edge of the side which will meet the back you have the taper and radius factored in already. I know you know what I'm taling about, but here is a video anyway - https://youtu.be/7oojobi72mE

There are a set of known dimensions, the unbent side length, the length of the box, the radius in question, neck block height, tail block height, etc... I'm expecting there is not a way short of modeling all this up to derive the profile to use for the unbent side. Is that correct? I didn't want to head down the rabbit hole of modeling it all up only to learn there is some easier way to arrive at that shape.

Note: I mean arrive at the shape on the computer. I'm aware of how to trace the shape with the mold using a washer and pencil, etc... what I mean is arrive at the shape in CAD.

Thanks!
Brad

_________________
Insta - https://www.instagram.com/cbcguitars/
Facebook - https://www.facebook.com/cbcguitars


Top
 Profile  
 
PostPosted: Wed Jul 12, 2023 11:27 pm 
Offline
Contributing Member
Contributing Member
User avatar

Joined: Sun Mar 06, 2011 12:04 am
Posts: 5727
First name: Chris
Last Name: Pile
City: Wichita
State: Kansas
Country: Good old US of A
Focus: Repair
Status: Professional
I read it, Brad.
As a long time CNC guy, and there's no easy way - you gotta do the math. But sometimes it's hard to figure out what math to do. Good luck.

_________________
"Act your age, not your shoe size" - Prince



These users thanked the author Chris Pile for the post: bcombs510 (Thu Jul 13, 2023 10:18 am)
Top
 Profile  
 
PostPosted: Thu Jul 13, 2023 10:19 am 
Offline
Brazilian Rosewood
Brazilian Rosewood
User avatar

Joined: Mon Jul 27, 2015 8:21 am
Posts: 3224
First name: Brad
Last Name: Combs
Focus: Build
Status: Amateur
Chris Pile wrote:
I read it, Brad.
As a long time CNC guy, and there's no easy way - you gotta do the math. But sometimes it's hard to figure out what math to do. Good luck.

Thanks, Chris!

Yeah, I’m expecting to have to model it all up. What I didn’t want was to get way down the rabbit hole and then have someone point me to R.M. Mottola’s online calculator or some such. :D

Brad


Sent from my iPhone using Tapatalk Pro

_________________
Insta - https://www.instagram.com/cbcguitars/
Facebook - https://www.facebook.com/cbcguitars


Top
 Profile  
 
PostPosted: Thu Jul 13, 2023 11:03 am 
Offline
Koa
Koa
User avatar

Joined: Sat May 02, 2009 2:59 pm
Posts: 555
First name: Marcus
Last Name: Bailie
City: Kirkland
State: WA
Focus: Build
I know some more advanced programs can do it, but I can't remember off the top of my head which ones. I think I remember reading that Fusion 360 can do it in "Sheet Metal" mode. I've been meaning to try it out for awhile.

_________________
-Marcus
http://www.bailieguitars.com
Instagram | YouTube



These users thanked the author Marcus for the post: bcombs510 (Thu Jul 13, 2023 11:36 am)
Top
 Profile  
 
PostPosted: Thu Jul 13, 2023 5:31 pm 
Offline
Contributing Member
Contributing Member
User avatar

Joined: Thu May 12, 2005 5:46 am
Posts: 2921
Location: United States
Use masking tape to tape up the side of one of your finished guitars and then peel it off. this will give you a flat pattern for the sides.

_________________
Jim Watts
http://jameswattsguitars.com



These users thanked the author Jim Watts for the post: bcombs510 (Thu Jul 13, 2023 9:18 pm)
Top
 Profile  
 
PostPosted: Thu Jul 13, 2023 7:28 pm 
Offline
Cocobolo
Cocobolo

Joined: Wed Jan 08, 2014 7:58 pm
Posts: 270
First name: Leo
Last Name: Pedersen
City: Bowen Island
State: British Columbia
Zip/Postal Code: V0N 1G2
Country: Canada
Focus: Build
Status: Amateur
I can confirm that there are functions in Rhino3D to show the flattened version of curved surfaces. I'm guessing that most other CAD packages have similar functions. Which one are you using Brad?

But yeah those functions presume you already have the 3D model done.



These users thanked the author Durero for the post: bcombs510 (Thu Jul 13, 2023 9:16 pm)
Top
 Profile  
 
PostPosted: Thu Jul 13, 2023 8:27 pm 
Offline
Contributing Member
Contributing Member
User avatar

Joined: Wed Oct 08, 2008 11:36 am
Posts: 7203
Location: Southeast US
City: Lenoir City
State: TN
Zip/Postal Code: 37772
Country: US
Focus: Repair
Jim Watts wrote:
Use masking tape to tape up the side of one of your finished guitars and then peel it off. this will give you a flat pattern for the sides.

That’s what I do too but I figured Brad
was talking about a new design.


Steve

_________________
Steve Smith
"Music is what feelings sound like"



These users thanked the author SteveSmith for the post: bcombs510 (Thu Jul 13, 2023 9:18 pm)
Top
 Profile  
 
PostPosted: Thu Jul 13, 2023 9:18 pm 
Offline
Brazilian Rosewood
Brazilian Rosewood
User avatar

Joined: Mon Jul 27, 2015 8:21 am
Posts: 3224
First name: Brad
Last Name: Combs
Focus: Build
Status: Amateur
Yeah, I want the shape in CAD. It’s long winded, but suffice it to say I want to do more than just make a side template out of acrylic with the knowledge. :)

I’m using Fusion 360 and Marcus had me on the right path. I’ve got a set of steps using the sheet metal unfold approach. Working through it now.

Thanks all!


Sent from my iPhone using Tapatalk Pro

_________________
Insta - https://www.instagram.com/cbcguitars/
Facebook - https://www.facebook.com/cbcguitars



These users thanked the author bcombs510 for the post: Gasawdust (Sat Jul 15, 2023 8:19 am)
Top
 Profile  
 
PostPosted: Tue Jul 18, 2023 9:18 am 
Offline
Walnut
Walnut

Joined: Wed Sep 11, 2019 3:47 am
Posts: 2
Location: Munich, Germany
Hi,
im pretty confident, that every decent CAD-App has commands for that kind of operation.
rhino has two commands to do that task, and I use them to do side-templates:
- one for a curve: CreateUVCrv
- on efor a surface: UnrollSrf
best regards
Chris


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 9 posts ] 

All times are UTC - 5 hours


Who is online

Users browsing this forum: No registered users and 1 guest


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