Frugel-Horn Mk3 - Page 51 - diyAudio
Go Back   Home > Forums > Loudspeakers > Full Range

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 31st March 2011, 08:02 PM   #501
kec is offline kec  United States
diyAudio Member
 
kec's Avatar
 
Join Date: Mar 2001
Location: California
Quote:
Originally Posted by chrisb View Post
If using 18mm throughout, parts, you'd likely want to modify dimensions to adjust for additional 3mm thickness per layer of internal parts. ( i.e. 9mm deeper / 6mm taller ) Sorry for the metric, try as I might I can't think in imperial when it comes to cabinet making - round to the nearest 32nd" is close enough.
For the FH3, page 3 already has dim's for 18mm. Or, are you talking in general?
__________________
Intel D410 mITX > Foobar > Musiland 01 USD > Gigawork DAC > Crown XLS1000 > Manzanita Ultra
  Reply With Quote
Old 31st March 2011, 08:33 PM   #502
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Quote:
Originally Posted by kec View Post
For the FH3, page 3 already has dim's for 18mm. Or, are you talking in general?

Well to be honest, there are often several generations of drawings, and I don't always see the final official plansets, so my apologies for any confusion. If Dave has released drawings specifying 18mm for all parts, then certainly use them.

Unless they're wrong

hmm, smilies not workin at the moment - that should be an ironic "EEK"
__________________
you don't really believe everything you think, do you?
community sites t-linespeakers.org, frugal-horn.com commercial site planet10-HiFi
  Reply With Quote
Old 1st April 2011, 11:42 AM   #503
diyAudio Member
 
Join Date: Nov 2009
Location: Home of The Fighting Gamecocks
One thing I learned about plywood sold in the US is that even though it's labeled as 3/4 inch ( 19mm ), in reality it measures 23/32 inches which equals 18.03mm.
  Reply With Quote
Old 1st April 2011, 01:59 PM   #504
diyAudio Member
 
Pit Hinder's Avatar
 
Join Date: Nov 2006
Location: Hannover, Germany
Send a message via ICQ to Pit Hinder
PG, manly hug across the ocean. Over here it´s the other way round.
19mm is standard for particle board or MDF, so you convert the drawings to 18mm ply - only to find that the stuff you have bought is 19 thick and you shouldn´t have burned the original plan.

Pit
  Reply With Quote
Old 1st April 2011, 05:06 PM   #505
chrisb is offline chrisb  Canada
diyAudio Member
 
Join Date: Aug 2002
Location: victoria BC
Quote:
Originally Posted by Poultrygeist View Post
One thing I learned about plywood sold in the US is that even though it's labeled as 3/4 inch ( 19mm ), in reality it measures 23/32 inches which equals 18.03mm.


At least on the west coast, one needs to be even more wary of import Meranti, birch or other plywoods. Our commercial millwork company consumes well many thousands of sheets of various materials a year, and in this class we've seen not only high numbers of voids, unbalanced (in other words even) numbers of plys, serious delamination of glue joints, sand through on factory finished face veneers, and most significantly to this conversation thickness variations of well over .5mm - not only between sheets in a lift, but within the span of a single 4x8 sheet. This certainly makes life interesting when CADCAM cutting and machining depends on materials to be the actual dimensions at which they're spec'ed.

There's no politically delicate way to put it, these materials are almost always sourced from "the orient".

OTOH, I've used more than a few sheets of 3 ply Bamboo by Smith & Fong and others, and while it can be more challenging to work with than Baltic Birch, I've never had any such quality issues.
__________________
you don't really believe everything you think, do you?
community sites t-linespeakers.org, frugal-horn.com commercial site planet10-HiFi
  Reply With Quote
Old 1st April 2011, 06:01 PM   #506
diyAudio Member
 
Bob Brines's Avatar
 
Join Date: Jan 2003
Location: Hot Spring Village AR
The discussion of plywood sourcing and sizing aught to be a sticky thread.

Here in the middle of the USA, all import (i.e. China) 3/4" plywood is 18mm and the quality of the stuff is from poor to OMG! Baltic birch is 18mm and the best grade I can get is BC. Cabinet grade veneered plywood is avaiable in true 3/4". Voids tend to be gaps between sheets in any given ply and rarely more than 1/4". This is my current choice in birch or maple because I don't consider the difference between this and BB to be worth the 120 mile round trip to Little Rock to get the BB. 12mm BB is available locally and this is what I use for smaller cabinets.

3/4" MDF is invariably 18mm. I have a lumber yard tha stocks MDF that is far superior (heavier) than what Lowe's/HD carries. I usually buy nominal 1"x12"x16' or 1"x15"x16' shelving because it is much easier to handle than 4'x8' sheets.

YMMV and probably will local to local.

Bob
  Reply With Quote
Old 1st April 2011, 07:40 PM   #507
diyAudio Member
 
Pit Hinder's Avatar
 
Join Date: Nov 2006
Location: Hannover, Germany
Send a message via ICQ to Pit Hinder
Bob,

<<The discussion of plywood sourcing and sizing aught to be a sticky thread.>>

Truer words were rarely spoken.

Pit
  Reply With Quote
Old 1st April 2011, 07:43 PM   #508
jimbro is offline jimbro  United States
diyAudio Member
 
Join Date: Nov 2010
Location: somewhere in Texas
Pardon me if this has been covered but I can't find it if it has. Can el70 and chr70 be swapped without modification or would I need to build some kind of removable baffle? Can't tell for sure from the documentation I've seen. I realize the stuffing may need to be adjusted. Thank you.
  Reply With Quote
Old 1st April 2011, 07:44 PM   #509
frugal-phile(tm)
diyAudio Moderator
 
planet10's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC, NA, Sol III
Blog Entries: 5
Quote:
Originally Posted by jimbro View Post
Can el70 and chr70 be swapped without modification
Yes.

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 2nd April 2011, 12:04 PM   #510
diyAudio Member
 
Join Date: Nov 2009
Location: Home of The Fighting Gamecocks
Hi Pit, same to you and you should try a pair. The Mk3's are as much fun as I've had lately with my pants on.
  Reply With Quote

Reply


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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
The Frugel-Horn Project planet10 Full Range 1216 8th June 2014 09:02 PM
My Frugel-Horn Build italynstylion Full Range 130 22nd June 2010 12:24 AM


New To Site? Need Help?

All times are GMT. The time now is 06:47 PM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2