Horn builders tool - diy rip fence/guide - 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 6th May 2009, 09:06 AM   #1
diyAudio Member
 
Join Date: Oct 2007
Default Horn builders tool - diy rip fence/guide

So I got the ply for building my pair of Sachikos and ran into the problem of
rippling the 8x4 sheets into precise 11 3/4" strips. All I have is a cheap
circular saw and no access to a table saw or CNC and other niceties.

I rigged up a cheap rip fence or guide which might interest some of
the folks here.
I cut about 4 strips of ply so far and all are absolutely precise at 11 3/4" width.

You need a couple of lengths of threaded rod (the kind you
get in Home Depot), 8 pairs of nuts and washers and a flat metal strip of
about 1/2" width and 8" to 12" length.
I used two lengths of 20" of 8mm threaded rods.

I cut two strips of about 1.5" , drilled holes for the threaded rod, and
welded them to the base of the circular saw. Welded two such strips
to the long metal strip.

The pics here should be self explanatory.

http://picasaweb.google.com/prasadb/RipFence#

- Prasad
Attached Images
File Type: jpg rip-fence-small.jpg (53.4 KB, 562 views)
  Reply With Quote
Old 6th May 2009, 01:57 PM   #2
pjanda1 is offline pjanda1  United States
diyAudio Member
 
pjanda1's Avatar
 
Join Date: Jan 2005
Location: Boulder, CO
How precise were your cuts? I've thought of building a rip fence. I don't have a table saw either, but even if I did, I don't have room for enough table to handle big sheets (like you need for the big boxes). I've always clamped straight edges as guides. When I built the BIB's, I cut a strip to the distance I needed for the guide (required board width + distance from saw edge to blade edge). That was quick, but not as quick as a fence would have been.

pj
  Reply With Quote
Old 6th May 2009, 02:23 PM   #3
diyAudio Member
 
Join Date: Oct 2007
Quote:
How precise were your cuts?
There is no measurable (with a tape/scale) variation from top to bottom of the
sheet. I stacked up the cut sheets against a wall, and as far as I
can see, they are all the same width all the way. I guess the error is of
the order of a millimeter.
Any errors will become evident as the build progresses.

Prasad
  Reply With Quote
Old 6th May 2009, 03:15 PM   #4
thosuk is offline thosuk  United Kingdom
diyAudio Member
 
Join Date: Nov 2005
Location: UK
Try this
Simple and minimises splintering
  Reply With Quote
Old 6th May 2009, 03:27 PM   #5
Mr Evil is offline Mr Evil  United Kingdom
diyAudio Member
 
Join Date: Aug 2004
Location: Behind you
I use some "guide clamps". They make great straight edges for marking long lines too.
__________________
https://mrevil.asvachin.eu/
  Reply With Quote
Old 6th May 2009, 05:20 PM   #6
diyAudio Member
 
Join Date: Oct 2007
What I was trying to solve was a way to adjust/set once and get the
same dimension for every subsequent cut. Repeatability.

In a design like the Sachiko, to get a tight air seal at the joint with the sides,
the width of all the internal pieces must be within close tolerance.

I do use a guide like the Popular Mechanics one for smaller or one-off cuts.
  Reply With Quote
Old 7th May 2009, 06:06 PM   #7
EEatKSU is offline EEatKSU  United States
diyAudio Member
 
Join Date: Oct 2006
Try something like this, they do work well.

http://www.amazon.com/All-Clamp-9-In...1719550&sr=1-4
  Reply With Quote
Old 8th May 2009, 11:42 PM   #8
Account disabled at member's request
 
Join Date: Oct 2003
Location: Atlanta
Default Rip Cutting Jig

I made one similar to this several years ago. It is specific to your individual saw. You mark your points, line up each end, and get very square cuts.

http://www.lowes.com/lowes/lkn?actio...d/RipCirc.html
  Reply With Quote
Old 9th May 2009, 06:38 PM   #9
gychang is offline gychang  United States
diyAudio Member
 
Join Date: Feb 2005
Location: Davis, California
I have tried most of above... Most have one problem in common that narrower stock can not be cut accurately.

For example one needs to cut 10" width of long plywood, and u have 12"..., can be done but I find it difficult... I manage to get by with the circular saw.

gychang
  Reply With Quote
Old 9th May 2009, 07:23 PM   #10
diyAudio Member
 
Join Date: Oct 2007
GY, I ran into the same scenario where you need to trim a little bit off
along the whole length.

The rip fence I made works fine to cut narrow pieces
by simply fixing the threaded rod towards the cutting wheel , instead of
the other side as shown in my original pic.
(It needed a small mod to my fence, so the saw handle does not obstruct the
threaded rod.)

So the vertical guide piece is on the same side as the
cutting wheel and I can adjust the cut size down to about 20 mm.
It could probably do even smaller, but the saw safety casing on my saw hinders
further travel of the guide. I didn't need better than this, so I left it there.
  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 definitive Sachiko builders guide quadtech Full Range 2 4th February 2009 07:21 PM
Electric Fence DavidWardlaw Everything Else 15 20th July 2007 01:05 AM
Aura NS3-193-8A fence posts. castlesteve Full Range 13 10th July 2007 07:35 PM
Frugel-horn builders in Australia? Brisso57 Full Range 0 8th July 2007 07:53 AM
Demagnetising Tool/Tool Demagnetiser mrfeedback Everything Else 30 4th October 2002 11:53 PM


New To Site? Need Help?

All times are GMT. The time now is 05:48 AM.


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