How to assemble mdf? - Page 6

chiily · 1st April 2011, 04:09 PM

Butt joints and drilling end grain didn't seem the right way to do things when I put my speakers together. Butt joints can a pain to align and clamp. Whilst drilling end grain on MDF, even with pilot holes is a lot of work and the MDF can bulge.

I instead used biscuit joints. Once I'd played around with a biscuit joiner for an hour or so I realised that I could produce very strong joints that aligned perfectly and stayed align when I clamped them up.

The speakers were build with an inner 18mm MDF carcase, cross braced, all biscuit joined using PVA. Wrapped around the inner was another 18mm MDF box, again biscuit joined but epoxied together and to the inner. Heavy and very strong.

And a couple of pictures...

The final speaker, one of two

Dagwood · 2nd April 2011, 02:26 AM

Wow, great result!

How do they sound? what design are they??

Cheers

Cal Weldon · 2nd April 2011, 04:40 AM

Quote:

Originally Posted by chiily

Butt joints can a pain to align and clamp.

Not if you install cleats before assembling the panels.

Really nice speakers BTW.

chiily · 2nd April 2011, 09:42 AM

They sound pretty wonderful. The combination of a 10" bass unit in a sealed box and the mid plus tweeter on an open baffle is the right combination for me.

I've put together a pdf with details and build notes BoM - final-revamp-1.pdf

I can't take credit for the design. I just 'smoothed' the shape and swapped the tweeter.

Cheers

Dagwood · 3rd April 2011, 12:05 AM

Cheers

A pair of these might just have to go on the project list!

Thanks for such detailed info, It may take a while but will keep you posted on progress. In the mean time I have joined PFM and will look into James (fellow Kiwi)work.

Cheers

chiily · 3rd April 2011, 01:07 AM

Quote:

Originally Posted by Dagwood

Cheers

A pair of these might just have to go on the project list!

Thanks for such detailed info, It may take a while but will keep you posted on progress. In the mean time I have joined PFM and will look into James (fellow Kiwi)work.

Cheers

The problem with these speakers is that the bass unit is no longer manufactured. However, there does seem to be a glut of them in Australia, well there was last time I looked.

The original built thread is PFM Special - a simpler and more affordable DIY loudspeaker design - pink fish media My build is on the end of James's design posts.

Oh and welcome to PFM. James has built a few speaker designs which have been documented on PFM, try searching for 'Ergo'.

1st April 2011, 04:09 PM	#51
chiily diyAudio Member Join Date: Mar 2003 Location: Malvern	Butt joints and drilling end grain didn't seem the right way to do things when I put my speakers together. Butt joints can a pain to align and clamp. Whilst drilling end grain on MDF, even with pilot holes is a lot of work and the MDF can bulge. I instead used biscuit joints. Once I'd played around with a biscuit joiner for an hour or so I realised that I could produce very strong joints that aligned perfectly and stayed align when I clamped them up. The speakers were build with an inner 18mm MDF carcase, cross braced, all biscuit joined using PVA. Wrapped around the inner was another 18mm MDF box, again biscuit joined but epoxied together and to the inner. Heavy and very strong. And a couple of pictures... The final speaker, one of two __________________ H&Ks Garf.

2nd April 2011, 02:26 AM	#52
Dagwood diyAudio Member Join Date: Feb 2010 Location: North of Auckland	Wow, great result! How do they sound? what design are they?? Cheers __________________ If you keep digging in the garden of failure you will eventually find success

2nd April 2011, 09:42 AM	#54
chiily diyAudio Member Join Date: Mar 2003 Location: Malvern	They sound pretty wonderful. The combination of a 10" bass unit in a sealed box and the mid plus tweeter on an open baffle is the right combination for me. I've put together a pdf with details and build notes BoM - final-revamp-1.pdf I can't take credit for the design. I just 'smoothed' the shape and swapped the tweeter. Cheers __________________ H&Ks Garf.

3rd April 2011, 12:05 AM	#55
Dagwood diyAudio Member Join Date: Feb 2010 Location: North of Auckland	Cheers A pair of these might just have to go on the project list! Thanks for such detailed info, It may take a while but will keep you posted on progress. In the mean time I have joined PFM and will look into James (fellow Kiwi)work. Cheers __________________ If you keep digging in the garden of failure you will eventually find success

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Help to assemble a broken louspeaker..	coldcut	Multi-Way	3	23rd September 2008 01:41 PM
Would i be able to assemble my own crossover?	PoorSound	Multi-Way	10	11th February 2008 10:02 PM
Please help me assemble my UcD180 stereo-amp	zhai	Class D	6	6th December 2006 05:52 AM
Need to assemble a clock.	Maples	Everything Else	3	28th November 2004 05:19 AM
MDF/Sand/MDF cabinet details	Petter	Multi-Way	25	16th April 2002 02:10 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read