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How to split a block of spruce

 
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Simski
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Joined: 11 Jan 2009
Posts: 3

PostPosted: Sun Jan 18, 2009 4:53 pm    Post subject: How to split a block of spruce Reply with quote

Hi

I am in the process of building a rebec and need some woodworking advice. I have made the body and need to get working on the top. I have a block of quartersawn spruce as used by violinmakers - it looks like this https://www.tonewood.sk/img/tonewood/051403m.jpg. The block needs to be divided in two and then joined together but how do you do the split? I only have handsaws at the moment but they would probably be too inaccurate in the split. I do not know anybody with a large powersaw but I could probably find someone. I was thinking about getting a wood froe and do the split with that. The demonstrations I have seen were very impressive.

How would you do split a piece of wood of this sort?

Thanks
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Mat Roop
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Joined: 24 Mar 2007
Posts: 911
Location: Wyoming Ontario

PostPosted: Sun Jan 18, 2009 9:45 pm    Post subject: Reply with quote

Find someone with a good bandsaw....Good luck... Mat
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actonern
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Joined: 15 Aug 2007
Posts: 444

PostPosted: Mon Jan 19, 2009 5:39 pm    Post subject: Reply with quote

I wouldn't try splitting this piece, as per the photo.

The billet itself looks like it was sawn and if you try to split it down the middle you may find the split goes evenly down the middle, or more likely off on an angle, rendering the piece useless.
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Simski
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Joined: 11 Jan 2009
Posts: 3

PostPosted: Mon Jan 19, 2009 7:06 pm    Post subject: Reply with quote

Right, so I need a large bandsaw to do this? I have no experience with this type of billet so I am completely blank right now.
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Jack H.
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Joined: 24 Mar 2007
Posts: 346
Location: Israel

PostPosted: Tue Jan 20, 2009 2:27 am    Post subject: Reply with quote

if the block was split I would just grab my Chinese cleaver and a hammer and split it again down the middle. If it is sawn then I would recommend using a large band saw. There has to be a carpenter in town that you can call and pay him to saw it for you nice and straight on a band saw.
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Jack H.
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Joined: 24 Mar 2007
Posts: 346
Location: Israel

PostPosted: Tue Jan 20, 2009 2:27 am    Post subject: Reply with quote

if the block was split I would just grab my Chinese cleaver and a hammer and split it again down the middle. If it is sawn then I would recommend using a large band saw. There has to be a carpenter in town that you can call and pay him to saw it for you nice and straight on a band saw.
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violinarius
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Joined: 14 Dec 2007
Posts: 171

PostPosted: Tue Jan 20, 2009 11:23 am    Post subject: Re: How to split a block of spruce Reply with quote

Simski wrote:
Hi
I only have handsaws at the moment but they would probably be too inaccurate in the split.
Thanks


The people before electrical tools did just this type of work with hand tools.

The question is one of skill, sharpness, the right tool, and margin of error. If the rebec requires a certain amount of wood for it's thickness, and you allow enough for flattening the plates, then you should have a certain amount of excess left-over wood.

If that amount is say 1/4" then drawing a line down the middle and the a line 1/8' on each side should help to guide you.

If the margins are too tight, or other requirements too steep or dear, then best not to try this.
I would try a local woodworking group, or school shop to see if anyone would be willing to bandsaw it for you.

Some wood has a twist in it, and not all cut pieces of wood follow the grain, so splitting is a very risky proposition.
When makers buy split wood they have to pay extra for it because fewer tops are gotten out of a tree trunk when splitting because of the added thickness to accommodate the grains tendencies to go off on an angle.
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Simski
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Joined: 11 Jan 2009
Posts: 3

PostPosted: Tue Jan 20, 2009 6:08 pm    Post subject: Reply with quote

Right, I am probably gonna check in with the local shop and have them saw it. Better not to take any chances with this. Thanks for the advice, everybody!
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MANFIO
Super Member


Joined: 11 Apr 2007
Posts: 458
Location: Sao Paulo

PostPosted: Wed Jan 21, 2009 2:10 pm    Post subject: Reply with quote

I resaw my split spruce in a bandsaw too.

But if you are going to make a rebec and if it's your first instrument, perhaps you could try domestic North American wood. Simeon Chambers sells a quite nice Englemann spruce that is already seasoned for decades. I've made my latest viola with it and liked it very much.
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Geemac
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Joined: 06 Jul 2008
Posts: 93
Location: Spruce Grove

PostPosted: Fri Jan 23, 2009 11:14 am    Post subject: Reply with quote

For what it's worth I use an older method. I go to the local lumber mill and look carefully at large 12 x 12 blocks of spruce that are made for chocking the tires of large equipment. I inspect for knots and tightness of grain and if I am lucky enough I find a very old one that is almost grey/black on the outside. I buy it for five bucks and take it home where I split it in a quarter sawn way. Then I run the pieces I select through a thickness planer and joint and glue the edges. After the glue dries I make one more pass through the thickness planer and I am ready to use the piece for a fiddle.
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