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-   -   Frugel-Horn Mk3 (https://www.diyaudio.com/forums/full-range/172605-frugel-horn-mk3.html)

kec 31st March 2011 08:02 PM

Quote:

Originally Posted by chrisb (https://www.diyaudio.com/forums/full-range/172605-frugel-horn-mk3-post2522999.html#post2522999)
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?

chrisb 31st March 2011 08:33 PM

Quote:

Originally Posted by kec (https://www.diyaudio.com/forums/full-range/172605-frugel-horn-mk3-post2523298.html#post2523298)
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"

Poultrygeist 1st April 2011 11:42 AM

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.

Pit Hinder 1st April 2011 01:59 PM

PG, manly hug across the ocean. Over here itīs the other way round.:D
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 shouldnīt have burned the original plan.:rolleyes:

Pit

chrisb 1st April 2011 05:06 PM

Quote:

Originally Posted by Poultrygeist (https://www.diyaudio.com/forums/full-range/172605-frugel-horn-mk3-post2523976.html#post2523976)
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.


:soapbox:
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.

Bob Brines 1st April 2011 06:01 PM

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

Pit Hinder 1st April 2011 07:40 PM

Bob,

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

Truer words were rarely spoken.

Pit

jimbro 1st April 2011 07:43 PM

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.

planet10 1st April 2011 07:44 PM

Quote:

Originally Posted by jimbro (https://www.diyaudio.com/forums/full-range/172605-frugel-horn-mk3-post2524470.html#post2524470)
Can el70 and chr70 be swapped without modification

Yes.

dave

Poultrygeist 2nd April 2011 12:04 PM

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.


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