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nicksorenson · 06-09-2008, 07:25 PM

I'm building guitar amp cabinets with 1x12 pine and have a continual problem with cupped and bowed boards. I'm using a jig (Keller) to make the ends dovetailed. It works very nicely except that the boards are cupped. Is there a way to make sure everything comes together nice and true?

My guess is make sure everything is clamped nice and tight with pipe clamps when glued. Is that right?

Sorry if that's a dumb question! I'm new to woodworking.
thanks!!
Nick

**bobj3** · 06-09-2008, 07:58 PM

Hi Nick

Just about all 12" boards will be cupped if not now in time,, once a tree always a tree..

It's best rip them down to two or 3 parts then glue them backup...the norm is right down the heart wood of the plank...

I know it sounds like alot more work and it is, BUT if you don't do it now you will have a great bow and arrow cabinet...

========

**Mike** · 06-09-2008, 08:14 PM

Nick, if the grain pattern is not important you can buy boards made from 1x2" strips glued to useful sizes like 12, 18 or 24" widths. These are available in both pine and hardwood such as aspen. If the grain is important consider using veneered plywood with the edges dressed with veneer or an edge cap.

nicksorenson · 06-09-2008, 09:12 PM

Quote:

Originally Posted by Mike

Nick, if the grain pattern is not important you can buy boards made from 1x2" strips glued to useful sizes like 12, 18 or 24" widths. These are available in both pine and hardwood such as aspen. If the grain is important consider using veneered plywood with the edges dressed with veneer or an edge cap.

That would actually be very nice. The grain doesn't matter at all. Every amp I'm building for the time being will be covered by a vinyl material. So, joined 1x2's would work perfect. Are they comparably priced to 1x12?

AxlMyk · 06-09-2008, 09:31 PM

It would be a lot less work to use 3/4" plywood, or MDF, although MDF is heavy.
If you're just making the amp case, 1/2" would be acceptible. 3/4" for speakers.

nicksorenson · 06-09-2008, 10:20 PM

This is very true if it were just from a workability perspective. However in the case of audio equipment there's quite a bit of hype about what wood works for certain sounds. Also there is the reality side (beyond the hype side) of what sounds best. Of course tradition determines what we 'think' sounds best and pine unfortunately is the industry standard for small combo guitar amps. So... I'm stuck with it. Fun!!

Quote:

Originally Posted by AxlMyk

It would be a lot less work to use 3/4" plywood, or MDF, although MDF is heavy.
If you're just making the amp case, 1/2" would be acceptible. 3/4" for speakers.

**harrysin** · 06-10-2008, 09:10 AM

I do hate to give an opposing view to a fellow member, but, during my 50 working years in the consumer electronics industry I had a steady trickle of guitar amps/speakers for repair, professional and beginners both for repair to the amps. or re-coning of the literally blown drivers which gave me an insight into the cabinets and I don't recall ever seeing one made from Pine, besides which the guys who use this equipment spend heaps of money on devices to DISTORT the sound! I never did understand the latter as most of my work was on top end audio where distortion figures around 0.001% were achievable. Plywood would be my choice.

nicksorenson · 06-10-2008, 11:57 AM

Quote:

Originally Posted by harrysin

I do hate to give an opposing view to a fellow member, but, during my 50 working years in the consumer electronics industry I had a steady trickle of guitar amps/speakers for repair, professional and beginners both for repair to the amps. or re-coning of the literally blown drivers which gave me an insight into the cabinets and I don't recall ever seeing one made from Pine, besides which the guys who use this equipment spend heaps of money on devices to DISTORT the sound! I never did understand the latter as most of my work was on top end audio where distortion figures around 0.001% were achievable. Plywood would be my choice.

Wow, someone else into electronics and wood working! Great!

The main reason I'm using pine is that the 1950's - 1970's Fender Tube amps were made using Pine for the cabinet and plywood for the speaker baffle. Almost all of the quality Fender amps had Pine cabs. Now the ReIssues have MDF cabinets. But they're not as good sounding. And there are lots of corners cut.

Marshall on the other hand used almost ALL plywood. Both are known as great amps. But... for some reason I'm using pine. I guess partly because my amps are closer to the vintage Fender tube amp product line than Marshall's line up. I may try one with 100% plywood and see what it sounds like.

**bobj3** · 06-10-2008, 02:04 PM

Hi Nick

If you used the search tool on the forum, you will find many members that have made speaker boxes plus some...

Some GREAT boxes..

===

06-09-2008, 07:25 PM	#1
nicksorenson Registered User Jr. Member Join Date: Jun 2008 Posts: 14 View nicksorenson's Gallery	Report This Post! Working with cupped 1 x 12 pine boards How do I do it? I'm building guitar amp cabinets with 1x12 pine and have a continual problem with cupped and bowed boards. I'm using a jig (Keller) to make the ends dovetailed. It works very nicely except that the boards are cupped. Is there a way to make sure everything comes together nice and true? My guess is make sure everything is clamped nice and tight with pipe clamps when glued. Is that right? Sorry if that's a dumb question! I'm new to woodworking. thanks!! Nick
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06-09-2008, 07:58 PM	#2
bobj3 Forum Contributer Supreme Forum King Join Date: Jan 2006 Location: Littleton,Colorado U.S.A. Posts: 8,298 View bobj3's Gallery	Report This Post! Hi Nick Just about all 12" boards will be cupped if not now in time,, once a tree always a tree.. It's best rip them down to two or 3 parts then glue them backup...the norm is right down the heart wood of the plank... I know it sounds like alot more work and it is, BUT if you don't do it now you will have a great bow and arrow cabinet... ======== __________________ PodCast videos RWS on YouTube http://www.routerforums.com/86898-post1.html Besure and click on the Up Arrow key ▲ on the Youtube video, you can select other youtube videos on router tables http://www.woodworkingonline.com/?s=dovetail Machine Cut ▼ http://www.woodworkingonline.com/200...cut-dovetails/ http://www.woodworkingonline.com/woo...podcast-store/ http://www.woodshopdemos.com/menu2.htm Bob J. Last edited by bobj3; 06-09-2008 at 08:13 PM.
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06-09-2008, 08:14 PM	#3
Mike Senior Moderator Supreme Forum King Join Date: Nov 2004 Location: Detroit, Michigan USA Posts: 3,378 View Mike's Gallery	Report This Post! Nick, if the grain pattern is not important you can buy boards made from 1x2" strips glued to useful sizes like 12, 18 or 24" widths. These are available in both pine and hardwood such as aspen. If the grain is important consider using veneered plywood with the edges dressed with veneer or an edge cap. __________________ Mike Please edit your profile with a name and location so we can better assist you.
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06-09-2008, 09:31 PM	#5
AxlMyk Registered User Supreme Forum King Join Date: Jun 2006 Location: Hartland, Mi. USA First Name: Mike Posts: 1,019 View AxlMyk's Gallery	Report This Post! It would be a lot less work to use 3/4" plywood, or MDF, although MDF is heavy. If you're just making the amp case, 1/2" would be acceptible. 3/4" for speakers. __________________ Mike - Retired FoMoCo Tradesman My Gallery @ http://www.routerforums.com/axlmyks-stuff/
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06-10-2008, 09:10 AM	#7
harrysin Forum Contributer Supreme Forum King Join Date: Jan 2007 Location: Western Australia Posts: 3,333 View harrysin's Gallery	Report This Post! I do hate to give an opposing view to a fellow member, but, during my 50 working years in the consumer electronics industry I had a steady trickle of guitar amps/speakers for repair, professional and beginners both for repair to the amps. or re-coning of the literally blown drivers which gave me an insight into the cabinets and I don't recall ever seeing one made from Pine, besides which the guys who use this equipment spend heaps of money on devices to DISTORT the sound! I never did understand the latter as most of my work was on top end audio where distortion figures around 0.001% were achievable. Plywood would be my choice. __________________ *Harry*
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06-10-2008, 02:04 PM	#9
bobj3 Forum Contributer Supreme Forum King Join Date: Jan 2006 Location: Littleton,Colorado U.S.A. Posts: 8,298 View bobj3's Gallery	Report This Post! Hi Nick If you used the search tool on the forum, you will find many members that have made speaker boxes plus some... Some GREAT boxes.. === __________________ PodCast videos RWS on YouTube http://www.routerforums.com/86898-post1.html Besure and click on the Up Arrow key ▲ on the Youtube video, you can select other youtube videos on router tables http://www.woodworkingonline.com/?s=dovetail Machine Cut ▼ http://www.woodworkingonline.com/200...cut-dovetails/ http://www.woodworkingonline.com/woo...podcast-store/ http://www.woodshopdemos.com/menu2.htm Bob J. Last edited by bobj3; 06-10-2008 at 02:30 PM.
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