Search found 181 matches

by Craig Bumgarner
Sat Feb 17, 2018 7:49 am
Forum: Instrument Builders Forum
Topic: Of interest, repairing a hole in top
Replies: 5
Views: 744

Re: Of interest, repairing a hole in top

I'd be interested. Would like to see close ups of the repair in process.
by Craig Bumgarner
Sat Jan 20, 2018 12:31 am
Forum: Instrument Builders Forum
Topic: How to Repair Truss Rod Rattle
Replies: 13
Views: 1550

Re: How to Repair Truss Rod Rattle

Amazing saxophone repair, I won't even know where to begin with something like that. :cl I bet that is one happy saxophone owner. Your "Master of Nothing" signature line needs to be qualified and updated.
by Craig Bumgarner
Mon Oct 30, 2017 11:09 pm
Forum: Instrument Builders Forum
Topic: Accident!!!Don't drop one of these!
Replies: 11
Views: 2005

Re: Accident!!!Don't drop one of these!

I use my Veritas Dremel base a lot more than my Stewmac base these days. Lot more solid.
by Craig Bumgarner
Tue Sep 12, 2017 10:47 pm
Forum: Instrument Builders Forum
Topic: Air brush for finish touch ups
Replies: 4
Views: 1292

Re: Air brush for finish touch ups

My Iwata gravity cup airbrush is excellent for tint and finish touchups.
by Craig Bumgarner
Sat Sep 09, 2017 7:01 am
Forum: Instrument Builders Forum
Topic: Vacuum molding
Replies: 28
Views: 6197

Re: Vacuum molding

Yes, that's it, WEST 105 Resin. I use the 205 fast hardener for laminating. Though "fast", there is still plenty of working time, especially once it is rolled out. I've never lost a batch due to kicking before I could get it applied. Once rolled out, you have at least 30-40 minutes working time if n...
by Craig Bumgarner
Thu Sep 07, 2017 5:50 am
Forum: Instrument Builders Forum
Topic: Vacuum molding
Replies: 28
Views: 6197

Re: Vacuum molding

Oh, another thing. I've found short nap 3" foam rollers work best for applying epoxy to the veneers. i use Wooster R039 trim rollers or WEST brand foam roller cover cut in half. This applies a thin, but uniform layer of glue. I wet out both faces of an interface to insure against dry spots. I have u...
by Craig Bumgarner
Thu Sep 07, 2017 1:33 am
Forum: Instrument Builders Forum
Topic: Vacuum molding
Replies: 28
Views: 6197

Re: Vacuum molding

No experience with Nomex to date, but have a piece big enough for a back I'd like to try some time. I only use the fancy veneers on the outside. With the Selmer guitar types I build, poplar for the middle plies and mahogany for show piece on the inside is standard. Both are light weight, glue well a...
by Craig Bumgarner
Wed Sep 06, 2017 1:34 am
Forum: Instrument Builders Forum
Topic: Vacuum molding
Replies: 28
Views: 6197

Re: Vacuum molding

BTW, I typically get 23 inches of vacuum with my set up, far from perfect, but more than adequate. I get excellent glue penetration, not voids and good reproduction of the mold shape even in the recurves.
by Craig Bumgarner
Wed Sep 06, 2017 12:54 am
Forum: Instrument Builders Forum
Topic: Vacuum molding
Replies: 28
Views: 6197

Re: Vacuum molding

As Ross says, I've been vacuum molding backs for my gypsy guitars, both spherical and violin back shaped (I have a hard time saying arch-top back :-) Made the violin back shaped molds by gluing medium density PVC foam sheet to a 3/4" MDF board and carved out the shape in the foam, tapered into the M...
by Craig Bumgarner
Fri Jun 30, 2017 1:31 am
Forum: Instrument Builders Forum
Topic: Spherical fret ends
Replies: 13
Views: 3875

Re: Spherical fret ends

Yes, I would be interested. I've done it by hand using files with the frets in the fingerboard. Gets the job done but nearly impossible to keep the ends lined up so the ends lay in a line when sighted. Minor point I guess, but an element of craftsmenship I suppose.
by Craig Bumgarner
Thu Jun 29, 2017 11:47 pm
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: String tension
Replies: 5
Views: 1906

String tension

Wondering if there are elements of design that affect string tension other than the obvious like string gauge, string construction, string height off the frets and scale length? I ask because players sometimes tell me some of my guitars with all the elements just listed being identical, seem to have...
by Craig Bumgarner
Thu Jun 01, 2017 4:53 am
Forum: Instrument Builders Forum
Topic: Picking a Drum Sander
Replies: 18
Views: 5097

Re: Picking a Drum Sander

My homebuilt works well. I used this web page as a guide: http://www.krtwood.com/ww/sander2/index.html The only substantial change I made is to use spiral velcro and velcro sand paper instead of the slot and wedge concept in the article. It was pretty easy to build, certainly easier than coming up w...
by Craig Bumgarner
Tue May 23, 2017 6:49 am
Forum: Instrument Builders Forum
Topic: Forum Software Update
Replies: 14
Views: 4010

Re: Forum Software Update

I got rid of the drop down (up?) menus by logging out, logging in and then forcing a new load of the page with the shift key and clicking the reload icon (Chrome). I think the shift key works that way in other browsers, Mozilla for sure. Clearing history would do the same thing, but gets rid of a lo...
by Craig Bumgarner
Fri May 05, 2017 10:11 pm
Forum: Instrument Builders Forum
Topic: Modal Tuning in Denver
Replies: 8
Views: 2300

Re: Modal Tuning in Denver

Trevor Gore wrote:.... It's pretty clear that there is a lot of demand though, which augers well for more classes in the future.
I'd probably go to your class most anywhere in the US 48 states, so please put me on your list of those interested if you have such a thing. Thanks!
by Craig Bumgarner
Wed May 03, 2017 5:45 am
Forum: Instrument Builders Forum
Topic: Modal Tuning in Denver
Replies: 8
Views: 2300

Re: Modal Tuning in Denver

Man, how did I miss that was happening? Dang it!
by Craig Bumgarner
Mon Apr 03, 2017 11:19 pm
Forum: Instrument Builders Forum
Topic: Advice on fixing edge chips in top and back
Replies: 6
Views: 1714

Re: Advice on fixing edge chips in top and back

... then fill with clear CA.

Or, drop fill with nitro, multiple times. Nitro is very clear.
by Craig Bumgarner
Mon Apr 03, 2017 10:32 pm
Forum: Instrument Builders Forum
Topic: Advice on fixing edge chips in top and back
Replies: 6
Views: 1714

Re: Advice on fixing edge chips in top and back

Beautiful mandolin. A burst is a good idea, certainly in character for this one. If you are committed to a clear finish, you can at least try to blend pieces into the chips. Hopefully you have some of the same wood left (I save my cutoffs until the instrument is done and gone for just this kind of t...
by Craig Bumgarner
Tue Mar 28, 2017 12:00 am
Forum: Instrument Builders Forum
Topic: Adjusting sound
Replies: 38
Views: 8329

Re: Adjusting sound

FWIIW, I use the default settings on the settings page. On the main display, I use No Smoothing on the smoothing options in the lower left corner and Peak Hold in the lower right. I have not utilized the many custom options because 1) FFT seems to work fine with the defaults and 2) I'm lazy. Don't l...
by Craig Bumgarner
Sat Mar 25, 2017 1:07 am
Forum: Instrument Builders Forum
Topic: Jigs - Are they worth it?
Replies: 11
Views: 3505

Re: Jigs - Are they worth it?

Some jigs are very worthwhile, others no so much. I'm sure we all have a collection of jigs we once used, but no longer because somehow the task is better done without the jig. No way to know how it is going to fall out most of the time, so jigs get made and some are used, others are not. Patterns f...
by Craig Bumgarner
Thu Mar 16, 2017 12:44 am
Forum: Instrument Builders Forum
Topic: Adjusting sound
Replies: 38
Views: 8329

Re: Adjusting sound

....it's a buzz that sounds like a fret problem that is heard on top two strings whether open or fretted, there is no fret issue as I have already looked into this replacing both saddle and nut with plenty of clearance. If the problem exists on the open B and E strings and every fret all the way up...
by Craig Bumgarner
Wed Mar 15, 2017 11:31 pm
Forum: Instrument Builders Forum
Topic: Adjusting sound
Replies: 38
Views: 8329

Re: Adjusting sound

I'm not real good at looking at other builders Frequency Response Curves (FRC) because there is a fair amount of information picked in recording the curves that helps interpret. A couple things though. The big peak at 94hz seems too low to be T(1,1)2. More likely T(1,1)1, the air resonance. Are you ...
by Craig Bumgarner
Wed Mar 15, 2017 12:34 am
Forum: Instrument Builders Forum
Topic: Adjusting sound
Replies: 38
Views: 8329

Re: Adjusting sound

I used Visual Analyzer at first but switched to the FFT app by Andrew Smith a couple years. It is about $10. As far as I know, it works only on Apple iOS, iPhone and iPad. VA is kind of quirky to set up and use. FFT by Andrew Smith requires minimal set up, very intuitive to use, saves files for futu...
by Craig Bumgarner
Tue Mar 14, 2017 1:09 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Implications of back resonance lower than top
Replies: 2
Views: 1587

Re: Implications of back resonance lower than top

Thanks for the insights Trevor, will read up on 2.3-11.
by Craig Bumgarner
Sat Mar 11, 2017 1:12 am
Forum: Contemporary Acoustic Guitar Design and Build - Trevor Gore
Topic: Implications of back resonance lower than top
Replies: 2
Views: 1587

Implications of back resonance lower than top

I keep running into Selmer style guitars with soft backs with low monopole peak resonance (T(1,1)3. So low, they are below the top monopole peak, T(1,1)2. I don't think it is intended other than it makes the guitars lighter and light weigh is revered though the reasoning is not scientific that I kno...
by Craig Bumgarner
Thu Mar 09, 2017 1:33 am
Forum: Instrument Builders Forum
Topic: vacuum pumps
Replies: 17
Views: 4615

Re: vacuum pumps

Have a look at Veneer Supplies in Maryland, USA. They sell pumps, vacuum bags, etc. and have some DIY kits / plans. I bought the vacuum bag I use for laminating backs there, has worked well for 15 backs so far. It might be a stretch for you to buy out of country and I'm sure can find what you need l...