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19th December 2016, 07:56 PM #1Senior Member
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Trim Routing Tasmanian Blackwood - advice please
Hi again, Happy Christmas season !!
I need to trim a Tasmanian Blackwood fretboard, 6.5mm thickness, just glued this afternoon to a Les Paul style mahogany neck.
The fretboard overhangs the neck by 2-3 mm.
During my adventure of discovery with this timber (novice with it), I have found that it is prone to splintering when routing. I found this out when trimming the Tassie Blackwood 3mm headstock veneer piece on the table to a slight over-size, before gluing it to the headstock (where the tuners are located). I was routing it with the grain when a piece from end to end just broke off. Fortunately, it glued back together with no sign of the break.
I glued the veneer piece to the headstock with a 2- 3 mm overhang , and after the router experience, just used my oscillating sander with 340 grit sleeves to trim it flush. Its a good finish, and a bonus, no tannin burn marks.
So.... here I am now with a permanently glued to neck 6.5mm thick fretboard with a 3mm overhang, and feeling very nervous about trying to trim rout it to the neck size with a ball bearing trim bit running on the neck edge. Yes, unlike the headstock veneer experience, the fretboard is now glued solidly to the neck, but will the overhang split and tear out along the edge of the neck as I trim it back ?
I could use the oscillating sander again to a 1mm overhang and then finish flush by hand, but I'd love to feel confident enough to use the trim router bit.
Thanks for reading and for any advice you can give.
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19th December 2016 07:56 PM # ADSGoogle Adsense Advertisement
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19th December 2016, 09:22 PM #2SENIOR MEMBER
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Do you have a spoke-shave ? I would give that a go if you have access to one. A hand tool will give you more control.
Keith
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19th December 2016, 10:25 PM #3Taking a break
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Or a block plane.
Blackwood is fine as long as you're going with the grain; as soon as you have to cut against the grain it's going to tear and, because it's so stringy, splinters don't just break off, they take a whole big chunk with them.
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19th December 2016, 11:33 PM #4GOLD MEMBER
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To prevent any splintering do it as a climb cut - but make sure that you are holding the router very firmly.
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20th December 2016, 11:58 AM #5Senior Member
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Thank you for the advice. It is obvious from your replies that this timber is a bit tricky for the un - initiated. Elan, its the "big chuck aspect" I'm concerned about. Like if I'm going along nicely and it suddenly tears a bit of the overhang and travels up into the neck area. Bohdan, I think I will squib out on the router , I just don't have the experience and feel (yet).
Pedro66, I don't have a spoke shave per say, but I have ordered a NZ style vegetable peeler which I saw a Kiwi use in a U-tube video to shape ukulele necks from a blank !
It should be here tomorrow so I can try that and finish with a block sand, as suggested here too.
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20th December 2016, 12:13 PM #6
I have used a spokeshave on a blackwood frettboard for just the reasons you have raised. Pare down to just proud of neck then finish with sandpaper on a block. If I was you I would get a spokeshave as soon as. Handy for all kind of luthery work and a lot of other stuff as well. Routers are real work savers but they can also ruin a work piece in the blink of an eye.
Regards
John
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20th December 2016, 02:14 PM #7Senior Member
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20th December 2016, 02:39 PM #8
I'm particularly partial to Lie Nielsen's small bronze flat bottomed shave, available in Oz from https://www.henryeckert.com/index.ph...product_id=578
and if you don't already have the gear, you'll need to invest in a sharpening system.regards from Alberta, Canada
ian
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20th December 2016, 06:39 PM #9Senior Member
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Thanks Ian. I'll suggest it to Mrs Santa here ! One thing I realised after my last post, I wont be able to use it in the situation I cited, because the fretboard is slotted (and thus the edges) ready for fret wire installation. But I do need one for shaping the back of the neck to suit my hand. Thanks for the lead to buy it .
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20th December 2016, 07:08 PM #10Taking a break
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24th December 2016, 12:39 PM #11Senior Member
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Elan, I have no experience at all with spoke shaves, but get the idea (I have scraped white metal bearings in another life). For a guitar neck shaping, are there different types and widths of spoke shaves that would do the convex curves of the back of the neck better than another type and width?
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31st December 2016, 04:20 PM #12SENIOR MEMBER
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Spokeshaves come in a variety of types. The the most common are straight faced (flat ) for flat or convex curves. The Round face spokeshave is for concave curves. there are also half round spokeshaves which have a deep concave face and is used for round legs or rails. A straight faced spokeshave can do this job but not as quickly or as efficiently. The other common one is the radius spokeshave for hollowing out seats etc. You probably should start with a standard straight faced one.
CheersI never make mistakes, I thought I did once but I was mistaken
Top 10 reasons I procrastinate
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5th January 2017, 02:28 PM #13Senior Member
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[QUOTE=Pusser;1998589]Spokeshaves come in a variety of types. The the most common are straight faced (flat ) for flat or convex curves. The Round face spokeshave is for concave curves. there are also half round spokeshaves which have a deep concave face and is used for round legs or rails. A straight faced spokeshave can do this job but not as quickly or as efficiently. The other common one is the radius spokeshave for hollowing out seats etc. You probably should start with a standard straight faced one.
Cheers[/QUOTE
Thanks Pusser. Helpful information.
I assume there are different widths of spokeshaves ?
Guitar necks are 50 -60mm wide measured across the fretboard, and about 20 -23mm thick at the widest point of their radius on the back where a spokeshave would be used. What size spokeshave should I get for shaping a (say, QLD Maple) blank 100mm x 40mm x 700mm ? Thanks, Don.
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5th January 2017, 02:57 PM #14
Because where I used to live in Sydney, the cost of getting to and from the weekend tool market -- in petrol and tolls, but mostly tolls -- was around $35. Do that three times waiting for a good old Stanley or Record to turn up and you've spent almost the same as for a new L-N.
regards from Alberta, Canada
ian
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5th January 2017, 03:20 PM #15
What I wouldn't give for a weekend tool market. They're every quarter around this neck of the woods and while there is nice stuff it can be quite pricey.
In saying that there are still gems, I found a really gorgeous Stanley #5 for $35 with a name engraved on the wing. Half an hour on some sandpaper and you'd never know!
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