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PostPosted: Wed Apr 14, 2021 10:15 am 
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Brazilian Rosewood
Brazilian Rosewood

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Location: Central PA
First name: john
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MDF machines well but it is not as stable as ply wood
the nice thing about this discussion is that there are many ways to do this. We all seem to develop methods that work for each individual. As a machinist and tool maker my discipline is secure fixturing .
What you want to do is have a way to make a process reproducible . So controlling critical aspect of the guitar goes without saying.
what are they ?
Symmetry
Neck block location
keeping sides true.
I use high grade balitic birch plywood , and early used many materials MDF being one of them , and if you use spreaders the MDF will flex , and don't get them wet.
Variable molds have issues but again do what works for you. Make an informed decision on need and affordability.
this is my method I use this as it removes an internal spreader and secures the location of the sides should you have to remove the rim.
https://www.youtube.com/watch?v=FcM3GErOI_A

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These users thanked the author bluescreek for the post: Pmaj7 (Tue May 04, 2021 7:29 pm)
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PostPosted: Thu Apr 15, 2021 6:27 pm 
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Joined: Sat May 17, 2008 1:11 pm
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Location: Spokane, Washington
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Mine require a socket and ratchet, so not super convenient, but I like the accuracy of the joints and low weight.

Attachment:
form copy.jpg


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PostPosted: Fri Apr 16, 2021 2:54 am 
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First name: colin
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FWIW, my $0.02 -
It's a bit more work initially, but I dowel and screw extra blocks top and bottom at neck and tail.
Lets me clamp the blocks in good and solid, and keeps everything square.
Just remove then after blocks are glued.

Attachment:
mold.jpg


But I'm using these 'universal' spreaders now.

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universal spreaders.jpg


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The name catgut is confusing. There are two explanations for the mix up.

Catgut is an abbreviation of the word cattle gut. Gut strings are made from sheep or goat intestines, in the past even from horse, mule or donkey intestines.

Otherwise it could be from the word kitgut or kitstring. Kit meant fiddle, not kitten.



These users thanked the author Colin North for the post: Pmaj7 (Tue May 04, 2021 7:37 pm)
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PostPosted: Mon Apr 26, 2021 11:36 am 
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Brazilian Rosewood
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Thanks everyone for the input. It's been really helpful for me!

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PostPosted: Tue May 04, 2021 7:38 pm 
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I do the extra end mold block like Colin on a few of my molds, works great. Hey, I like those universal spreaders!

Pat

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These users thanked the author Pmaj7 for the post (total 2): Colin North (Wed May 05, 2021 9:51 am) • doncaparker (Tue May 04, 2021 8:07 pm)
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PostPosted: Wed May 05, 2021 12:19 pm 
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Koa
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I like John Halls video about screwing the neck block to the mold.
Simple and seems to be very effective.
I'm stealing that one. :)

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PostPosted: Thu May 13, 2021 6:19 pm 
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Koa
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bluescreek wrote:
this is my method I use this as it removes an internal spreader and secures the location of the sides should you have to remove the rim.
https://www.youtube.com/watch?v=FcM3GErOI_A


Do you also screw in the tail? You mentioned not needing a spreader.


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PostPosted: Sat May 15, 2021 9:18 am 
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John

I like your mold for weight and efficient use of materials. What are the extra holes between the spacers for?

Ed M


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PostPosted: Sun Aug 08, 2021 5:02 pm 
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Walnut
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Definitely NOT "A." I bought one and regretted it immediately.

Home made ply from here on out.


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PostPosted: Mon Aug 09, 2021 9:55 am 
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D type.

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PostPosted: Mon Aug 09, 2021 10:27 am 
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Koa
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I think this is my favorite so far. I love those spreaders. Oh yeah, and the bench clutter. Just enough room for the job and no more. Makes me feel at home :-)


John Arnold wrote:
The only solid form I have made was the first one. The rest are plywood with the spacer blocks, as Alan describes. Much lighter. I use two spreaders; one longitudinal and one across the waist. The outside profile is a uniform 2" larger than the pattern, which simplifies clamping the sides in place to trim the ends accurately.

ImageImage

I use 1/4" bolts and wing nuts to join the mold halves. They are fully inside the perimeter of the mold.


Image

In action.

Image

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Last edited by banjopicks on Mon Aug 09, 2021 12:17 pm, edited 1 time in total.

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PostPosted: Mon Aug 09, 2021 11:55 am 
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Koa
Koa

Joined: Mon Feb 13, 2012 8:49 pm
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First name: peter
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John Arnold's mold....I'd love to understand the wood dimensions (material thickness, spreader height, considerations of height so's there is room left for kerfing clamps). The one dimension I have is for two inches for rim width, so I know the spreaders are two inches wide as well.

Thanks!

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