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Slow build log - not much defined on this one yet

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Slow build log - not much defined on this one yet

Postby Eric Baack » Thu Apr 09, 2015 11:09 pm

This was a bit of an excuse to use the CNC router so I'm starting up a slow build that I'd like to eventually sell. I've got some of the wood for it but still need the main body blank and fretboard blank. I'm up in the air on the body blank. I'm thinking walnut as I love the grain and how it turned out on my PRS inspired build.

For the cap I have 3 pieces of nicely figured hickory that I've cut with the cnc in a cool pattern. I'll be laminating some 1/8" Pau Ferro strips for a bit of a curved racing stripe look.

The neck will be laminated walnut/maple/walnut with a Pau Ferro fretboard. I might leave electronics out at first and give a prospective buyer a choice on them.

I'm hoping to get some good use out of the CNC on this one. It should be fun.
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Re: Slow build log - not much defined on this one yet

Postby Eric Baack » Fri Apr 10, 2015 9:53 am

Here's what the pre-machining on the top will be. As stated earlier, the pau ferro strips will go into the curved space that are symmetric with the guitar center line.

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Re: Slow build log - not much defined on this one yet

Postby Gordon Bellerose » Mon Apr 13, 2015 12:01 am

I really like the look of a "sort of" non symmetrical top.

The curved lines using different colors of wood looks really nice.
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Re: Slow build log - not much defined on this one yet

Postby Eric Baack » Tue Apr 21, 2015 10:45 pm

I'm thinking of a parker fly style guitar on this one. Here's a 3d model I made a while back:

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Here's the cap glued up and some shots of facing the back of it off on the cnc router. I'm pretty happy with it.

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Re: Slow build log - not much defined on this one yet

Postby Hans Bezemer » Wed Apr 22, 2015 2:38 am

Cool Eric,
Great to see your DIY-CNC-router at work!
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Re: Slow build log - not much defined on this one yet

Postby Eric Baack » Wed Apr 22, 2015 8:55 am

It makes an excellent planer too! It just takes a bit longer... I could have cranked the speed up on it and was taking some pretty light cuts, but I wanted a nice surface.
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Re: Slow build log - not much defined on this one yet

Postby Eric Baack » Thu Apr 30, 2015 2:40 pm

Just for fun, I recorded the machining simulation for the pockets and outer profile on the front of the guitar

https://youtu.be/hBgpLVn-WuA
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Re: Slow build log - not much defined on this one yet

Postby Eric Baack » Thu Apr 30, 2015 10:15 pm

Here's the sketchup model, exported as a .stl from solidworks. The solid around it is so that sketchup doesn't machine away the stock (and waste a lot of time and tooling making un-necessary sawdust)

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Here's the graphical representation of tool paths generated by sketchucam in sketchup

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Re: Slow build log - not much defined on this one yet

Postby Hans Bezemer » Fri May 01, 2015 1:22 am

Cool.
Following with interest.
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Re: Slow build log - not much defined on this one yet

Postby Eric Baack » Tue Sep 15, 2015 12:57 pm

Time to revisit this now that the CNC is about up and running. I've re-worked the model to get a really smooth neck to body transition and added contour to the back. I'm planning to cut a test run out of some pine and see how things turn out instead of ruining some nice wood. Heck, if the pine one turns out that might become my own.

Here's the rendered model from solidworks:

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This shows how smooth the neck to body transition is suppose to come out.

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Here's her back side...

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Re: Slow build log - not much defined on this one yet

Postby Eric Baack » Thu Oct 15, 2015 5:11 pm

Here's the neck glued up with the laminations. the 2 stripes are mahogany. I cut the profile on the cnc and then used it to face off the middle strip before using the spindle sander with a fence to smooth it out.

I did some test cuts on some pine of the body using the g-code generated with the sketchup add on and yeah, I'll be throwing that app in the garbage. It didn't even compensate for tool diameter! I'm using an evaluation version of cam-bam now, we will see how that does. It seems to be straightforward enough to do the stuff I want.

Here's the neck:

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Re: Slow build log - not much defined on this one yet

Postby Dan Smith » Thu Oct 15, 2015 6:42 pm

Well, so far it looks saweet!
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Re: Slow build log - not much defined on this one yet

Postby Eric Baack » Sat Oct 24, 2015 4:20 pm

Cutting some pine to test the code..


https://www.youtube.com/watch?v=zv_UsPy ... e=youtu.be
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Re: Slow build log - not much defined on this one yet

Postby Eric Baack » Mon Oct 26, 2015 9:30 am

Good thing I tested on pine again!!! the acceleration on the Z-axis was too high and it missed steps on a retract and then sent a nice 3/4" deep gouge through the body.. I adjusted my mach 3 settings and re-cut the top and it turned out nice. other then the huge gouge...

Gotta flip it over and machine the back. If all goes well I'll go ahead and cut out the body from a nice sandwiched piece of maple/walnut/maple.

I figured out that the hickory top with the pau ferro strips in it is about 1/8" too narrow so I didn't glue that on. Used a nice piece of maple instead.
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Re: Slow build log - not much defined on this one yet

Postby Eric Baack » Mon Oct 26, 2015 9:33 am

video actually works now.....
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Re: Slow build log - not much defined on this one yet

Postby Dan Smith » Mon Oct 26, 2015 7:38 pm

Eric Baack wrote:video actually works now.....

Awesome Eric!
Ever-body was kung fu fight-in,
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Re: Slow build log - not much defined on this one yet

Postby Eric Baack » Tue Oct 27, 2015 10:16 am

The Z-axis is doing some strange stuff. while machining the back last night it retracted to a couple of inches above the body. my max speed in the Z is only 50 IPM and my max acceleration is 3 in/s^2

going to have to get that figured out before I try cutting out the nice body.
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Re: Slow build log - not much defined on this one yet

Postby Eric Baack » Wed Dec 23, 2015 11:03 pm

I shaped the neck with the cnc tonight. It turned out pretty good. :D


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Re: Slow build log - not much defined on this one yet

Postby Eric Baack » Wed Dec 23, 2015 11:50 pm

I even found that chipped out piece on the headstock and glued it back in. then I have to glue wings to the headstock and finish that as well as cut the truss slot.
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Re: Slow build log - not much defined on this one yet

Postby Jason Rodgers » Thu Dec 24, 2015 1:51 am

I love the juxtaposition of the guitar neck and legos: everybody brings their toys to this table!
-Ruining perfectly good wood, one day at a time.
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