Official Luthiers Forum!
http://www-.luthiersforum.com/forum/

Ideas for trueing up the neck joint ?
http://www-.luthiersforum.com/forum/viewtopic.php?f=10102&t=10263
Page 1 of 1

Author:  Richard_N [ Tue Jan 09, 2007 3:10 am ]
Post subject: 

Hi

So the box is finished and I've moved on to the neck. I'm doing a Cumpiano style hardware neck joint (Mortice and Tennon)

I've test fitted the rough neck to the body ( no fingerboard yet) and it needs some adjustment.( Not suprising realy since both parts of the joint were cut by hand and I'm not the greatest of woodworkers - no I'm not a traditionalist - just skint !!!)

With the neck bolts just nipped up the top surface of the neck sits level with the soundboard both sides but compared to the centreline of the guitar it is misaligned to the left by about 1 degree if my calculations are right .

There are gaps at 2 oposing corners as shown in the diagram below

As far as I figure I should first remedy the gaps then remedy the angling of the neck. Obviously I need to remove material from the points shown as snug in the diagram above ( which is looking at the tennon end on ). I?m concerned that theres a risk of rounding off the corners if I just file away so I was going to make up a dummy mortice in a bit of scrap and (if the gaps check out the same ) double stick tape 80 grit sandpaper to the scrap and use it to sand the neck untill the gaps dissapear.

Does this seem like a good plan of attack or can you think of a better method ?

Thanks in advance for your help

PS 0.8 mm is just over 1/32 inchCachalote39091.4702662037

Author:  TonyKarol [ Tue Jan 09, 2007 3:57 am ]
Post subject: 

When fitting the neck, I put the body into a guitar vise, then hold the neck with one hand in postion while flossing, or pulling sandpaper between the heel and the body ... make sure when pulling that the sandpaper is either coming out of the joint flush, or angled down, so as to not round the heel off. depending on how much material I am removing, I might start with 80, but usually 150 and 250 to finish up. This is how I would set the back angle, and then as well check for centreline and work one side as required.

Author:  TonyKarol [ Tue Jan 09, 2007 3:58 am ]
Post subject: 

Looks like I just became Tony Koa ...1000 posts, and to boot, got some flame koa in the mail this morning. Cant wait till I become Braz rw then huh !!!

Author:  Richard_N [ Tue Jan 09, 2007 5:17 am ]
Post subject: 

Thanks for that you guys

I think thats pretty clear

Youve just stopped me wasting the evening messing around with scrap

Author:  Richard_N [ Tue Jan 09, 2007 1:09 pm ]
Post subject: 

I've just read the Stew Mac article and Re- read Tony's posts and have realised that they are talking about adjusting either the centreline or the neck angle.

My initial problem is the fact that the cheeks aren't symetrical - you can see in the (bad) sketch that on one side there is a gap at the top whereas the other side theres a gap at the bottom.

Will the flossing also work for this situation ? I'm guessing that it probably will if the sandpaper exits via the snug side . But I thought I'd check rather than risk making things worse !Cachalote39091.8839930556

Author:  Martin Turner [ Tue Jan 09, 2007 8:02 pm ]
Post subject: 

[QUOTE=Hesh1956] 1/Dreadnought_Guitar_Kits/Instructions/I-5295.html#details]h ere[/URL]

Also I always true up the area where the mortice is/will be with a sanding block prior to attempting to fit the neck.[/QUOTE]

I discovered this the hard way. If the area around the mortise isnt flat then you'll never get the heel sitting snug.

Author:  Richard_N [ Wed Jan 10, 2007 12:37 am ]
Post subject: 

Thanks for the info guys - got the neck trued up and ready for final adjustment once I've made the fretbaord and carved the neck.Went quicker than I expected once I got a feel for whats going on.

Thanks

Author:  peterm [ Wed Jan 10, 2007 4:16 am ]
Post subject: 

Great! Keep us posted with some pics when you can!

Page 1 of 1 All times are UTC - 5 hours
Powered by phpBB® Forum Software © phpBB Group
http://www.phpbb.com/