Jump to content

Voting for March 2020's Guitar Of The Month is open - VOTE HERE!

Sign in to follow this  
MiKro

Cut Horn Acoustic Hybrid

Recommended Posts

HI all,

Let's start with the new Cut Horn Hybrid Acoustic/Electric. It is still in prototype at this point. The body blank is 15 pieces of Nogal ( peruvian walnut) that was scrap. I cut all to size on the table saw and did the glue up. After that it went to the CNC for surfacing then on to the rouging of the body cavity. After that went to finish cut the body cavity minus cutting out the control panels. I cut the top from a mistake in book match from one I planned to use on the CH Bass, the current sound hole is not to final size. It fits nicely. It already has a great tap tone.

Next will be, on to making the sound hole insert, braces, and under saddle plate. The will make the bridge plate and finish cutting the pocket to match a few of my extra necks I have. Once that is done then will continue with the electric process of this one.

where it is going.

acou5a.thumb.jpg.4be7405a578346643501c3c1f2938fab.jpg

Where it started yesterday and where it is today.

 

1nogal_blank .jpg

2blank_nogal.jpg

3roughin1.jpg

4topinset1.jpg

topfirstfit1.jpg

  • Like 2

Share this post


Link to post
Share on other sites

That's flippin' cool, how thick is the top? Are you going to be bracing it or doing any kind of reinforcement under the bridge? 

Looking forward to seeing this one come together.

Share this post


Link to post
Share on other sites
19 minutes ago, ADFinlayson said:

That's flippin' cool, how thick is the top? Are you going to be bracing it or doing any kind of reinforcement under the bridge? 

Looking forward to seeing this one come together.

Here is my design, it will have arch top type bracing ( they will most likely get shaped as well) . The top will end up at 0.1875 thickness. The bridge will change as that one design did not work well in my tests. There will also be an under the top plate about 0.125" under the bridge saddle area.

 

acoustic_wbridge1a.jpg

  • Like 4

Share this post


Link to post
Share on other sites

"How to build a hollowbody guitar" by MiKro: Take a computer, do some coding, take a blank, let the computer carve it. Glue together. Voilà! Simple as a childrens' puzzle!

Or not...

There's features that look obvious in the image, however I wouldn't never have thought about creating them such as the slots for the braces or the collars for the back plates. So the book should start with something like: Study physics, maths, materials etc., learn how to code, get some serious machinery, learn how to set them up, waste a lot of material in learning etc...

  • Like 1

Share this post


Link to post
Share on other sites
9 hours ago, Bizman62 said:

"How to build a hollowbody guitar" by MiKro: Take a computer, do some coding, take a blank, let the computer carve it. Glue together. Voilà! Simple as a childrens' puzzle!

Or not...

There's features that look obvious in the image, however I wouldn't never have thought about creating them such as the slots for the braces or the collars for the back plates. So the book should start with something like: Study physics, maths, materials etc., learn how to code, get some serious machinery, learn how to set them up, waste a lot of material in learning etc...

Well yes there is that Bizman, Now as far as the witchery of this, I do have the skills and the time. Yes, I have made guitars by hand. This is an extension of using the best tools I have to produce the best product, if I can, in the hope it will be a great piece and repeatable. Not unlike the Big Boys who have plenty of money to do this in R&D, I have to make do with what I have.

It is no secret that all you said is true. I do have an Engineering Degree. I still study physics, quantum mechanics and other math as learning is always a plus for anyone. This project is based more on the Helmholtz Theories.

What is going to really bake your noodle with this one, is soon I will be cutting the entire back open to access certain parts so I can refine things. Making it something I can remove and replace at will for testing. All while using acoustic software and hardware to see the results of the changes I make to get the most out of this small volume of a chamber with hopefully a reasonable bass response.

Yes, it is Science and one of the most fun projects I have taken from my head for many years and moving forward with it. :)

MK

p.s.

In the interim of time while this project moves forward I will most likely make this style as an electric only offering as well. :)

  • Like 1

Share this post


Link to post
Share on other sites
47 minutes ago, MiKro said:

What is going to really bake your noodle with this one, is soon I will be cutting the entire back open to access certain parts so I can refine things. Making it something I can remove and replace at will for testing. All while using acoustic software and hardware to see the results of the changes I make to get the most out of this small volume of a chamber with hopefully a reasonable bass response.

Love that approach.  Can't wait :)

 

  • Like 1

Share this post


Link to post
Share on other sites

Oh, goddamnit! I found a grammatical error in my previous post, a double negative!

Nevertheless, there's lots to like in that project. No gal can resist the peruvian valnut! Guess I'll have to copy that design someday...

  • Like 1

Share this post


Link to post
Share on other sites
11 minutes ago, Bizman62 said:

Oh, goddamnit! I found a grammatical error in my previous post, a double negative!

Nevertheless, there's lots to like in that project. No gal can resist the peruvian valnut! Guess I'll have to copy that design someday...

<snip> " however I wouldn't never have thought " <snip>

LMAO!!!

Share this post


Link to post
Share on other sites

I managed to get the sound hole insert made and milled the top for it to install today despite it being 45* in the shop.  Next the braces and the first cut out of the body profile with coordinate location ears. :)

MK

 

 

soundhole1a.jpg

soundhole2a.jpg

sh4.jpg

sh5.jpg

sh6.jpg

sh7.jpg

  • Like 3

Share this post


Link to post
Share on other sites

More done today, Braces, Plate and profile cut. I left the braces rough so I can work them after I have access from the bottom.

 

prof1.jpg

prof2.jpg

prof3.jpg

prof4.jpg

prof5.jpg

  • Like 3

Share this post


Link to post
Share on other sites

Nice! Home made vanilla ice cream with a chocolate crust.:)

On a serious note Mike, did you cut your vacuum fitting on the router and make it too?

SR

  • Like 1

Share this post


Link to post
Share on other sites
1 hour ago, ScottR said:

Nice! Home made vanilla ice cream with a chocolate crust.:)

On a serious note Mike, did you cut your vacuum fitting on the router and make it too?

SR

Yes I did Scott.

MK

Share this post


Link to post
Share on other sites

As life has changed everyone lately, 🙂 I managed to get in the shop today and remove the back of the CTH acoustic hybrid. I now only have to make a temp back that will be held on by 20 screws so I have the ability to remove it and test processes to improve bass response. 🙂

I will be using a calibrated mic and TrueRTA analyzer software combined with my oscilloscope to produce (hopefully) the best response for this body volume and size.

I know the pictures suck. LOL!!

Thanks

MK

removing_the_back1.jpg

backremoved1.jpg

backdrilled.jpg

  • Like 2

Share this post


Link to post
Share on other sites
16 hours ago, MiKro said:

I will be using a calibrated mic and TrueRTA analyzer software combined with my oscilloscope to produce (hopefully) the best response for this body volume and size.

I'm looking forward to hearing how that goes, Mike.

SR

  • Like 1

Share this post


Link to post
Share on other sites
2 hours ago, ScottR said:

I'm looking forward to hearing how that goes, Mike.

SR

Me too Scott, I am sure it will be interesting at the least. Hell it may be a total bust? Nothing gained if I don't try though.

MK

  • Like 1

Share this post


Link to post
Share on other sites
21 hours ago, MiKro said:

As life has changed everyone lately, 🙂 I managed to get in the shop today and remove the back of the CTH acoustic hybrid. I now only have to make a temp back that will be held on by 20 screws so I have the ability to remove it and test processes to improve bass response. 🙂

I will be using a calibrated mic and TrueRTA analyzer software combined with my oscilloscope to produce (hopefully) the best response for this body volume and size.

I know the pictures suck. LOL!!

Thanks

MK

removing_the_back1.jpg

backremoved1.jpg

backdrilled.jpg

if feel drunk.  also, like the labor intense approach to getting it right: good for you.

hope you are taking care of yourself (better than I am anyway!)

  • Like 1

Share this post


Link to post
Share on other sites
1 minute ago, mistermikev said:

if feel drunk.  also, like the labor intense approach to getting it right: good for you.

hope you are taking care of yourself (better than I am anyway!)

I know the pictures suck. LOL!!

Doing as well as expected Mike, thanks for asking we are staying out of trouble and away from others.

mk

  • Like 1

Share this post


Link to post
Share on other sites
1 hour ago, MiKro said:

I know the pictures suck. LOL!!

Doing as well as expected Mike, thanks for asking we are staying out of trouble and away from others.

mk

tis all one can do!

 

  • Like 1

Share this post


Link to post
Share on other sites

Damn, my Old Tek 420a Oscillosope died the other day. The Power supply just crapped itself. Parts are non existent. 😞

I bought a new Siglent digital 100mhz scope. I found a hack for it to make it a 200mhz scope.  Saves me a few hundred dollars. 🙂

mk

  • Like 1

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Sign in to follow this  

×
×
  • Create New...