Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Construction Tips Construction techniques and tips

Rounding veneered mdf, possibly?
Rounding veneered mdf, possibly?
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
Reply
 
Thread Tools Search this Thread
Old 26th January 2018, 05:14 PM   #1
mart34 is offline mart34  England
diyAudio Member
 
Join Date: Jul 2004
Location: England
Default Rounding veneered mdf, possibly?

Hi,

Has anyone successfully used a router with a roundover bit, to round veneered mdf?

I like the idea of building the box out of veneered mdf sheet, then finishing off the edges with a router.

I'm concerned the veneer might catch and rip off, which won't happen when doing a straight cut with the right quality tools.

If not roundover, how about a 45 bit?

Many thanks
  Reply With Quote
Old 26th January 2018, 05:30 PM   #2
DPH is offline DPH  United States
diyAudio Member
 
Join Date: Dec 2008
Location: Portland, OR
Just to clarify: you have *already* veneered the panels and then want to put roundovers onto the corners? That simply wont work, and you'd need to look at using solid wood corners that you join to the veneered panels.

If you mean making an MDF box with roundovers on the corners *then* applying veneer -- yes, it's doable. The corners are a pain for sure, so if you can put a generous roundover (0.75"/19mm or greater), then the curvature is pretty manageable. I've done 1/2" and it's not exactly fun.
__________________
Happy DIYing, Daniel
  Reply With Quote
Old 26th January 2018, 05:56 PM   #3
mart34 is offline mart34  England
diyAudio Member
 
Join Date: Jul 2004
Location: England
Thanks for reply. Considered building an mdf box (whether straight edged or rounded edge) then veneering but I'm not confident I'll get the finish. I'm a perfectionist and would hate to build the box then ruin the veneering.

I actually meant pre veneered mdf panels. Link below
Veneered MDF Black Walnut Sheeting Cut To Size

Then using the router to round the edges. I'd be content staining the bare rounded mdf edges. I think this is what BKELEC do with their subwoofers, unless they use a wood quadrant on the edges, I'm not sure.
  Reply With Quote
Old 26th January 2018, 06:06 PM   #4
DPH is offline DPH  United States
diyAudio Member
 
Join Date: Dec 2008
Location: Portland, OR
Okay, I see what you mean now. If you can get some scrap, then I'd recommend taking a razor blade and making a score line at the roundover edge to reduce the chance of chip out. I've used a laminate trim bit to clean up the edges (namely on the driver cut outs) without issue.

My gut instinct is to say that the look of MDF edges with walnut veneer will be pretty undesirable, sadly. Any future projects I do with rounded baffles will use solid wood at least in the corners, if not the entire front (with a constrained layer damping to plywood) to avoid veneering the roundover. Flat panels with sharp edges aren't bad to veneer, though, in my experience.
__________________
Happy DIYing, Daniel
  Reply With Quote
Old 26th January 2018, 06:43 PM   #5
mart34 is offline mart34  England
diyAudio Member
 
Join Date: Jul 2004
Location: England
Thanks appreciate your advice. I just really don't trust my veneering skills. So my optons are to -
1. Use the pre-veneered mdf for all sides but then use solid walnut quadrants to mate the edges flush.l (concealing the mdf ends of the sheets)
2. Use pre-veneered mdf then use lengthe of straight solid walnut to almost frame all the edges.
3. Use plywood (router the edges however I want) then finish with a walnut stain, to try and replicate a walnut finish or at least colour.

Thanks again
  Reply With Quote
Old 26th January 2018, 06:48 PM   #6
DPH is offline DPH  United States
diyAudio Member
 
Join Date: Dec 2008
Location: Portland, OR
Yup! Good luck on your project!

P.S. I'd argue that you don't really want to do #1, but rather #2 if you go that way. You don't really need too much solid in order to make this work well, e.g. 1" by 1" in the edges themselves.
__________________
Happy DIYing, Daniel
  Reply With Quote
Old 26th January 2018, 06:48 PM   #7
lcsaszar is offline lcsaszar  Hungary
diyAudio Member
 
Join Date: Mar 2004
Location: Budapest, Hungary
I made veneering as on the attachment. 50 mm MDF, this was my first attempt.
Attached Images
File Type: jpg veneer.jpg (53.2 KB, 336 views)
File Type: jpg veneer3.jpg (162.5 KB, 330 views)

Last edited by lcsaszar; 26th January 2018 at 06:53 PM.
  Reply With Quote
Old 26th January 2018, 07:05 PM   #8
planet10 is offline planet10  Canada
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Rounding veneered mdf, possibly?
Quote:
I'm a perfectionist
Then why would you even be considering MDF for a woofer? Not the best material, and you end up with more back-strain. Plywood is not only lighter, but 15mm quality ply will give you better performance then 18mm mdf.

If you veneer before you round-over you will end up with a constrasting edge which if stained in a creative manner can be a nice touch.

Do note that with a woofer a roundover will only be cosmetic (if we ignore what a sharp end can do if you do a face plant against the corner) because the wavelengths are so much longer.

dave
__________________
community sites t-linespeakers.org, frugal-horn.com, frugal-phile.com ........ commercial site planet10-HiFi
p10-hifi forum here at diyA
  Reply With Quote
Old 26th January 2018, 07:13 PM   #9
DPH is offline DPH  United States
diyAudio Member
 
Join Date: Dec 2008
Location: Portland, OR
C'mon Dave, veneer laminated on MDF is pretty common for prefab architectural panels, although walnut-veneer plywood isn't too hard to find.

We're not sure the rest of the construction--and 1/2" mdf with a plywood base would work suitably.
__________________
Happy DIYing, Daniel
  Reply With Quote
Old 26th January 2018, 07:22 PM   #10
chrisb is offline chrisb
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Re #3 above - even with the highest quality veneer faced veneer core plywood, the cross-banded edge plies will take stain very unevenly. I'd suggest something along the lines of Daniel's recommendation, or the example in Laszlo's photo - was that veneer or thin solid?

Also note that if inlaying solid as edge detail to be wary that when sanding flush that the veneer is thin enough to sand through - more so in my experience on MDF core. BTW in the millwork trade, MDF with veneer faces is technically classified by most suppliers as "a plywood"

Daniel - without getting into the argument of MDF vs VC plywood, I'll note that having built a few speakers myself, post veneering a cabinet with edges either beveled in any direction, or rounded over in the long grain direction is easy enough - certainly with the larger radii you suggest - but a radius in the cross grain is tricky, and of course rounded corners are virtually impossible - which is where inlaid solid edging come into play.

This one was a challenge - in the days before I abandoned MDF altogether - the carcass was 1" MDF core dadoed into BB plywood matrix braced frame, with 1/4" veneer plywood, and cherry solid inlaid on all vertical and horizontal edges. Never had a scale in the shop, but they must have been 200lbs a piece - definitely my most time consuming build.
Attached Images
File Type: jpg tannoy.jpg (42.2 KB, 314 views)
__________________
a guy could get used to this being retired thing

Last edited by chrisb; 26th January 2018 at 07:39 PM.
  Reply With Quote

Reply


Rounding veneered mdf, possibly?Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
rounding inside 90's deebeez92 Construction Tips 3 17th April 2013 04:50 PM
Rounding internal angles ziocalepino Full Range 5 25th March 2011 03:13 PM
OB diffraction - rounding both side? Ang Multi-Way 1 11th January 2007 09:44 PM
Veneered MDF suppliers in the UK? Scottmoose Multi-Way 25 21st December 2005 08:41 PM
Front panel edge rounding sianturi Multi-Way 31 10th July 2003 06:17 PM


New To Site? Need Help?

All times are GMT. The time now is 03:39 AM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki