Search found 663 matches

by peter.coombe
Mon Sep 20, 2021 10:20 am
Forum: Instrument Builders Forum
Topic: Bandsaw recommendations
Replies: 14
Views: 349

Re: Bandsaw recommendations

I have an Inca, purchased from Garret Wade Melbourne in 1993, and as Nigel said it is a superb small bandsaw, especially with the Inca bandsaw blades. It did all my mandolin work and more for 16 years, and it is still doing it. Even re-sawed 2 Jarrah mandolin sets. Had to take it slow and careful, b...
by peter.coombe
Wed Jul 14, 2021 7:13 pm
Forum: The Gallery
Topic: New OM
Replies: 4
Views: 684

Re: New OM

May I ask what finish protects this Mandolin pls?
Target Coatings EM2000.
by peter.coombe
Mon Jul 12, 2021 9:34 pm
Forum: The Gallery
Topic: New OM
Replies: 4
Views: 684

New OM

Not a new OM guitar, but new flat top Octave Mandolin. This is a completely new model for me, with asymmetric points and 23 inch scale length. In this case I made the body a bit wider and thinner, and sized it to fit into a standard banjo case. I usually avoid points because they are just decoration...
by peter.coombe
Sun Jun 13, 2021 10:39 am
Forum: The Gallery
Topic: Backsides
Replies: 2
Views: 935

Re: Backsides

No that Qld Walnut stink does not linger in the finished instrument. If I sniff the soundhole I can just detect it, but mostly smell varnish and glue.
by peter.coombe
Wed Jun 09, 2021 2:47 pm
Forum: The Gallery
Topic: Backsides
Replies: 2
Views: 935

Backsides

Here are a few backsides of some recent mandolins. From left, Queensland Walnut, Blackwood, Red Gum, and Indian Rosewood. I was kind of hoping the Qld Walnut would be disappointing, but quite the contrary. Looks and sounds great, one of the best. It cost me two wrecked bandsaw blades. One when re-sa...
by peter.coombe
Wed May 05, 2021 3:35 pm
Forum: Instrument Builders Forum
Topic: Red gum
Replies: 21
Views: 7063

Re: Red gum

Here are some sound samples - http://petercoombe.com/Pictures/for-sale/Mandolin269/Lord%20Inchiquin.mp3 http://petercoombe.com/Pictures/for-sale/Mandolin269/Hornpipe.mp3 http://petercoombe.com/Pictures/for-sale/Mandolin269/bsa.mp3 This is the first of this style of mandolin where I have managed to g...
by peter.coombe
Wed May 05, 2021 10:06 am
Forum: Instrument Builders Forum
Topic: Voicing a Soundboard
Replies: 3
Views: 958

Re: Voicing a Soundboard

Chladni testing will give you lots of interesting information, but the difficult part is how to interpret it. How do the patterns correlate to the sound of the completed guitar? If you do get into that stuff I would highly recommend Alan Carruth's video. Otherwise "3", and read the Gore/Gilet books.
by peter.coombe
Fri Apr 23, 2021 10:25 pm
Forum: Instrument Builders Forum
Topic: Red gum
Replies: 21
Views: 7063

Re: Red gum

Well the red gum mandolin is finally finished. Took a while because I ran out of bridges and Vern Brekke is having problems at the moment with the CNC he was using so had to wait for a bridge. Was well worth the wait. All the nay sayers on red gum now need to eat their words. This is the best soundi...
by peter.coombe
Wed Feb 24, 2021 11:24 am
Forum: Instrument Builders Forum
Topic: Grants
Replies: 9
Views: 2926

Re: Grants

I have gone through the process and was unsuccessful, and the reason given why was unsuccessful I thought was really stupid. It took so much time and effort that I will never ever apply for a grant ever again. It is a lottery. Way too many applicants, not enough money.
by peter.coombe
Mon Feb 22, 2021 9:47 am
Forum: Instrument Builders Forum
Topic: Overseas payments
Replies: 12
Views: 3313

Re: Overseas payments

I've always gone with the philosophy of - the easier and more efficient you make your process to get paid, generally the quicker you'll be paid. Yep, and the more likely you will actually be paid. Customers need to be comfortable with what they are doing or they will back out. Penny pinching on fee...
by peter.coombe
Sat Feb 20, 2021 9:48 am
Forum: Instrument Builders Forum
Topic: Overseas payments
Replies: 12
Views: 3313

Re: Overseas payments

I use Paypal and eat the fees, but most of my sales are local nowadays. I send a Paypal invoice, and they can choose to pay with their Paypal account or with credit card. It is important to make it easy for the customer. I have used bank transfers, and used to have a merchant facility, but most peop...
by peter.coombe
Thu Feb 11, 2021 9:35 am
Forum: Instrument Builders Forum
Topic: Identifying wood
Replies: 23
Views: 4792

Re: Identifying wood

Could it be celery top pine?
Nope.
by peter.coombe
Wed Feb 10, 2021 12:31 pm
Forum: Instrument Builders Forum
Topic: Identifying wood
Replies: 23
Views: 4792

Re: Identifying wood

After looking at the picture closely, I can't tell if it is King Billy Pine or Western Red Cedar, but if I had to guess I would choose King Billy Pine. Cedar is usually darker, but some pieces I have are exactly the same colour as King Billy, and equally as fine grained. The only way to tell is to s...
by peter.coombe
Sat Jan 16, 2021 5:42 pm
Forum: Instrument Builders Forum
Topic: Red gum
Replies: 21
Views: 7063

Re: Red gum

Carbon fiber has a very high stiffness to weight ratio, which is good for the top, but that is not what I want for the back, it needs to be heavy. Remember the see saw analogy. The top needs to be as light as possible, so a carbon fiber lattice bracing might be worth a try, but I would not use it on...
by peter.coombe
Sat Jan 16, 2021 9:37 am
Forum: Instrument Builders Forum
Topic: Red gum
Replies: 21
Views: 7063

Re: Red gum

That is shellac, followed by Aquacoat pore filler, followed by varnish. The varnish is Target Coatings EM2000, which is an oil varnish in a water emulsion, so it is a water based finish but does not have any of the blue tinge you can see on darker woods that many of the water based finishes have. I ...
by peter.coombe
Thu Jan 14, 2021 10:53 am
Forum: Instrument Builders Forum
Topic: Red gum
Replies: 21
Views: 7063

Re: Red gum

Not too shabby under varnish. I am happy with this. Will continue, more later.
by peter.coombe
Wed Jan 13, 2021 10:11 am
Forum: Instrument Builders Forum
Topic: Red gum
Replies: 21
Views: 7063

Re: Red gum

Thank you Trevor. I never used it until now because the one piece I purchased twisted and cupped badly, but I am not so concerned about that in a flat top mandolin and for bindings it should not matter. So far so good and it has been though some big humidity changes with the braces on. Will try a bi...
by peter.coombe
Tue Jan 12, 2021 9:22 pm
Forum: Instrument Builders Forum
Topic: Red gum
Replies: 21
Views: 7063

Re: Red gum

Martin, you probably did not read my mandolin thoughts thread. I have been making flat top mandolins with dead backs for around 2 years. You can make a dead back by more hefty bracing, making the back thicker, using more dense wood, or laminating. I was mostly making the backs thicker. Why? They sou...
by peter.coombe
Tue Jan 12, 2021 4:16 pm
Forum: Instrument Builders Forum
Topic: Red gum
Replies: 21
Views: 7063

Re: Red gum

This is where I have problems with explanations. What is meant by "sound absorbtion qualities". A piece of wood has mass, stiffness and Q (amount of internal damping, high Q has less damping). High Q (e.g. rosewood) woods ring on for a long time, low Q woods have a shorter ring. So I assume you mean...
by peter.coombe
Tue Jan 12, 2021 10:10 am
Forum: Instrument Builders Forum
Topic: Red gum
Replies: 21
Views: 7063

Red gum

Has anyone tried red gum (i.e. river red gum) as a back and side wood? Only thing I can find after a bit of a hunt around is it is too heavy, splits easily. I am looking around for an Ebony substitute for mandolin backs that is more sustainable and not nose bleed expensive. So, Ebony is heavier and ...
by peter.coombe
Fri Dec 25, 2020 9:09 pm
Forum: Instrument Builders Forum
Topic: More mandolin thoughts - the end result
Replies: 13
Views: 5162

Re: More mandolin thoughts - the end result

Here are some more pictures of the recently completed mandolins. The BRW and the Tiger Myrtle have already sold, the first and second Ebony mandolins I have not offered for sale (yet) because I am still trying to decide which one to keep. The Tiger Myrtle has arrived with it's new owner just in time...
by peter.coombe
Tue Dec 08, 2020 10:39 am
Forum: The Gallery
Topic: New OM guitar
Replies: 11
Views: 4619

Re: New OM guitar

Semi gloss, but satin is also available.
by peter.coombe
Sat Dec 05, 2020 10:25 am
Forum: The Gallery
Topic: New OM guitar
Replies: 11
Views: 4619

Re: New OM guitar

What's the finish on that instrument?
It is Target Coatings EM2000, a water based alkyd resin varnish.
by peter.coombe
Tue Dec 01, 2020 2:40 pm
Forum: Instrument Builders Forum
Topic: More mandolin thoughts - the end result
Replies: 13
Views: 5162

Re: More mandolin thoughts - the end result

Well I have just strung up a new Tiger Myrtle and the second Ebony mandolin in the last few days. The Myrtle is a step below both Ebony mandolins in sound, although the back weight is about the same. I said I could not imagine any flat top mandolin sounding any better, well it is time to eat my word...
by peter.coombe
Sat Nov 28, 2020 10:01 am
Forum: Instrument Builders Forum
Topic: More mandolin thoughts - the end result
Replies: 13
Views: 5162

Re: More mandolin thoughts - the end result

Of course a 3 or 4 piece back would work, but it is additional work, and I am not sure how the customers would see it. I did make a mandolin with a BRW back, and it sounded quite nice, slightly louder and brighter than the Ebony, but lacked something and I always went back to the Ebony mandolin. A l...