Help to get the cheeks flush to the body

Dove Tail -- Mortise and Tenon -- the right choice and how to get it to fit
ken cierp
Posts: 3924
Joined: Tue Dec 13, 2011 11:23 pm

Re: Help to get the cheeks flush to the body

Post by ken cierp » Thu Aug 29, 2013 10:37 am

The references are to what you are likely to have/find nothing about making if so -- and there is the also note that Stem Mac might send a neck with no angle machined at all. So actually your starting point should have been to determine the check angle on the neck you have there. The idea is to make the neck cheeks and the fingerboard extension have complimentary angles forming a straight line.

Tim Benware
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Joined: Thu Dec 22, 2011 1:22 pm
Location: Asheboro, NC

Re: Help to get the cheeks flush to the body

Post by Tim Benware » Thu Aug 29, 2013 12:22 pm

ken cierp wrote:The references are to what you are likely to have/find nothing about making if so -- and there is the also note that Stem Mac might send a neck with no angle machined at all. So actually your starting point should have been to determine the check angle on the neck you have there. The idea is to make the neck cheeks and the fingerboard extension have complimentary angles forming a straight line.
As an example Mark, I recently had a neck that had an 88* angle (cheek and FB surface) that required a 92* complimentary angle on the body to keep it straight (88 + 92 = 180 [straight line]). The complimentary angle needs to be machined in at the start (the MM does a great job of that) or you end up having to do more tweaking/fitting to get it right.

If you didn't check that to start that is probably part of what you are experiencing now.
I've "Ben-Had" again!
Tim Benware
Creedmoor, NC

MarkAndrew1
Posts: 167
Joined: Sun Apr 21, 2013 9:48 am
Location: Milton, MA (just outside Boston)

Re: Help to get the cheeks flush to the body

Post by MarkAndrew1 » Thu Aug 29, 2013 1:39 pm

Tim Benware wrote:
ken cierp wrote:The references are to what you are likely to have/find nothing about making if so -- and there is the also note that Stem Mac might send a neck with no angle machined at all. So actually your starting point should have been to determine the check angle on the neck you have there. The idea is to make the neck cheeks and the fingerboard extension have complimentary angles forming a straight line.
As an example Mark, I recently had a neck that had an 88* angle (cheek and FB surface) that required a 92* complimentary angle on the body to keep it straight (88 + 92 = 180 [straight line]). The complimentary angle needs to be machined in at the start (the MM does a great job of that) or you end up having to do more tweaking/fitting to get it right.

If you didn't check that to start that is probably part of what you are experiencing now.
Tim....that's exactly what I didn't do. I needed to check the neck angle before I started anything and
then figure out what the complimentary angle needed to be. Actually, now that I think of it, I was trying
to do it the other way around (body angle then neck angle). I'm not sure how I came to that idea.

Anyway, It's a good mistake to learn from as I move forward in building future guitars.

Thanks!

MarkAndrew1
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Joined: Sun Apr 21, 2013 9:48 am
Location: Milton, MA (just outside Boston)

Re: Help to get the cheeks flush to the body

Post by MarkAndrew1 » Thu Aug 29, 2013 6:37 pm

ken cierp wrote:88.5 Degrees

I agree with Mike re-read all the stuff shown and explained here

http://kennethmichaelguitars.com/neckangle.html

Don't do anything more until you understand where the processes are going to take you. Ask questions if need be to get the concepts clear -- all the procedures require action related to cause and effect.

Show us pictures of the joint with the neck bolted in place with the simulator also securely clamped. This is not about specific angles but totally about making the fingerboard plane and the sound board extension area form a straight line

Here's a couple pics with the simulator. It's close but the cheeks still aren't
flush to the body....
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ken cierp
Posts: 3924
Joined: Tue Dec 13, 2011 11:23 pm

Re: Help to get the cheeks flush to the body

Post by ken cierp » Thu Aug 29, 2013 7:09 pm

Pretty good -- you may need to do just a tad of adjusting -- do nothing for now. Since we don't know your exact angles on this build you need to lay a straight edge on the FB plane and sound board -- full length nut to bridge location. Make sure the neck is bolted tight and the straight edge in touching. Take some pictures, we are looking for the gap at the saddle

MarkAndrew1
Posts: 167
Joined: Sun Apr 21, 2013 9:48 am
Location: Milton, MA (just outside Boston)

Re: Help to get the cheeks flush to the body

Post by MarkAndrew1 » Thu Aug 29, 2013 7:28 pm

ken cierp wrote:Pretty good -- you may need to do just a tad of adjusting -- do nothing for now. Since we don't know your exact angles on this build you need to lay a straight edge on the FB plane and sound board -- full length nut to bridge location. Make sure the neck is bolted tight and the straight edge in touching. Take some pictures, we are looking for the gap at the saddle

This is the only straight edge I have and it's 24"
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ken cierp
Posts: 3924
Joined: Tue Dec 13, 2011 11:23 pm

Re: Help to get the cheeks flush to the body

Post by ken cierp » Thu Aug 29, 2013 7:39 pm

"Take some pictures, we are looking for the gap at the saddle"

Slide the level more toward the end block so you can take a look at the measurement you are looking for. I can tell there is more work to do, you're tipped too far back from the sound board. The gap at the saddle should be about 1/16" +/-

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