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 Post subject: Template vs. Bit Depth
PostPosted: Sun Feb 23, 2020 4:58 pm 
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Walnut
Walnut

Joined: Sat Apr 28, 2012 11:16 am
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First name: Eric
Last Name: Smith
City: Richmond
State: CA
Zip/Postal Code: 94803
Focus: Build
Status: Amateur
Hi there,

Long time lurker trying to develop the skill set to made guitar with an angled neck joint. Specifically, I'm trying to make a few Les Paul Juniors. These guys have a 3 degree neck angle. So I built a Myra jig: http://www.mykaguitars.com/tools/neckpocketjig/. and a particle board jig with 3 degree wedges. The issue I'm having is that the corners of the neck pocket are a 3/8th radius, I have router bits but they are not long enough. The neck pocket is supposed to be 1 3/8" at the deepest, I can get the bit in the router to cut that deep but not with the height of the template 1/4" or the Myra jig 3/4". Yes I could use a larger bit but I can't find a top bearing 3/8" that is long enough to accommodate the height of the template and achieve the 1 3/8" depth. How have others solved this problem?


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PostPosted: Sun Feb 23, 2020 5:11 pm 
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Contributing Member
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Joined: Tue Aug 17, 2010 3:31 pm
Posts: 1682
First name: Kevin
Last Name: Looker
City: Worthington
State: OH
Zip/Postal Code: 43085
Country: USA
Focus: Build
Status: Amateur
This was years ago, but I think I used a 1/2" bit.

Why do you have to use 3/8"?

Kevin Looker


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PostPosted: Sun Feb 23, 2020 5:33 pm 
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Walnut
Walnut

Joined: Sat Apr 28, 2012 11:16 am
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First name: Eric
Last Name: Smith
City: Richmond
State: CA
Zip/Postal Code: 94803
Focus: Build
Status: Amateur
I have to use the 3/8 bit because of the curve radius on the heel of the neck. I made them from a template set, in retrospect I would make the necks with a 1/2 radius.


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PostPosted: Sun Feb 23, 2020 6:51 pm 
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Joined: Tue Aug 17, 2010 3:31 pm
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First name: Kevin
Last Name: Looker
City: Worthington
State: OH
Zip/Postal Code: 43085
Country: USA
Focus: Build
Status: Amateur
You can rasp or file it to 1/2".

I wouldn't fret it (no pun).


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PostPosted: Sun Feb 23, 2020 8:09 pm 
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Koa
Koa

Joined: Tue Jan 22, 2008 8:57 pm
Posts: 735
Location: Austin, Texas
3/8" radius???

that equates to a 3/4" diameter...

I just bought a 1 3/4" long cutting edge top bearing pattern bit last week that had a diameter of 3/4" which resulted in a 3/8" radius inside corner...Amana...they make them from 1 1/4" to 2" long


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PostPosted: Sun Feb 23, 2020 8:16 pm 
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Joined: Tue Aug 17, 2010 3:31 pm
Posts: 1682
First name: Kevin
Last Name: Looker
City: Worthington
State: OH
Zip/Postal Code: 43085
Country: USA
Focus: Build
Status: Amateur
Radius, diameter, 220V, 221V, whatever it takes...

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PostPosted: Sun Feb 23, 2020 11:43 pm 
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Brazilian Rosewood
Brazilian Rosewood

Joined: Thu Nov 04, 2010 1:46 pm
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First name: Freeman
Last Name: Keller
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I've done a number of angled set necks. I first plane the neck angle into the top at 3 3-1/2 degrees. I drill out as much waste as I can, then screw my neck pocket template directly on to the top - it is just 1/4 inch MDF. I'm pretty sure my bid is 3/8 diameter - the bearing follows the template, then as I move deeper it follows the walls of the cavity. I end up with the floor of the cavity at the same angle as the top.

I use the same template to size the tenon - I want it to fit snugly. When I route the mortise I put a layer or two of masking tape on the bearing surface - that way its a hair smaller and I can sand to fit.

Attachment:
IMG_5942-1.jpg


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