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View Full Version : TECH: Fishmouth tubing with a chop saw



boogieman
08-13-2009, 2:10 PM
Here is a site I found awhile back that is very useful. It tells you how to fish mouth tubing by using a chop saw. Fish mouth is the term used to describe how one tube has the profile of the pipe it will be welded against removed from it. This ensures a good fit and proper weld. This is very handy for frame and bracket or fender mounts. While there are other ways to fish mouth tubing, I think this is one of the fastest and cheapest.

http://www.pirate4x4.com/tech/billavista/Links/

The part about notching is about halfway down and starts under the heading "Building the Links." There is even a table of what angle to use on different size tubing.

BlueCollarMoto
08-13-2009, 5:23 PM
Now thats some good tec! Thanks for posting the link.

sickboi55
08-13-2009, 6:01 PM
that is definately a good tech.

boogieman
08-14-2009, 11:49 AM
I found it real useful. I was trying to make forward control mounts and this saved me a buttload of time and energy.

BolliverShagnasty
08-14-2009, 12:43 PM
Bookmarked. Thanks so much for the link.

JohnnyTremendous
08-16-2009, 5:40 PM
Thanks indeed. I can see myself using that info in the next litle bit.

albertahawk
05-06-2010, 1:24 PM
ive used the computer program for notching tubing but i bought a drill press notcher that uses hole saws is very handy

aephilli
05-06-2010, 1:49 PM
Greatest Hits?

Sawbones
05-06-2010, 4:04 PM
Yeah, I know it wasn't written by one of our members, but this could come in handy to have stickied somewhere.

billdozer
05-06-2010, 4:56 PM
Greatest Hits?

On the way.

kwiksilver
05-06-2010, 5:58 PM
Tigweld is my rock crawlin buddy here in Chas. He builds boat tops and does some of the tightest work around... with a chopsaw.

DirtFloorJim
05-06-2010, 6:05 PM
Pirate4x4 is full of great fabrication tech. As long as you can filter out all the asshats! Bikes and Jeeps are my toys of choice and I get most of my Jeep tech from that site. It's like the ChopCult of the off-road world. The tech is so useful I pay $20 a year to be able just to search that site.

Punkskalar
05-06-2010, 9:08 PM
Pirate4x4 is full of great fabrication tech. As long as you can filter out all the asshats! Bikes and Jeeps are my toys of choice and I get most of my Jeep tech from that site. It's like the ChopCult of the off-road world. The tech is so useful I pay $20 a year to be able just to search that site.

Yep, thats where my full build thread is on my XS... No one has as much tech as that place... Alot of it crosses to other motorsports as well

steffan
05-06-2010, 10:30 PM
Rad info! Thanks for sharing. We need more metal fab tech like this

billybiltit
05-07-2010, 1:42 PM
i have a mill and a joint jigger(uses holesaws)but sometimes use this technique to notch tubes that are bent and need notched too close to the bend(a-arms) to get in the joint jigger and wont easily clamp in the mill.so just grab a sharpie and hold the tube up where it needs to go and then mark it and notch it with the hot saw and BAM!
a big rat tail file helps to fine tune the notches also.

leon

pTc
07-03-2010, 7:09 AM
wow, that is a good one.

convergecult
10-04-2010, 11:45 PM
Thanks for that!

Lonnie
10-05-2010, 12:11 AM
that's how I always do them, but with an angle grinder and a cut off wheel. Quick and cheap.

bluesky2285
10-16-2010, 12:40 AM
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mmi794939
01-22-2011, 11:15 PM
good stuff good stuff

Wayland137
01-24-2011, 10:50 AM
Good tip.

SDJose
04-13-2011, 11:40 AM
I've used this method before with my last employer when our machine shop was backed up. I used the method a few days ago for handlebars I'm building. 20 deg. cut for 1 inch tubing with a Dewalt grinder and cutoff wheel.
http://i49.photobucket.com/albums/f280/SDJose/tbarsfishmouthed.jpg

xscorex
04-14-2011, 8:40 AM
anyone use the harbor freight tubing notcher? Its $44, with the 20% off coupon in the back of popular mechanics it would be under $40 and might be a big time saver.

dirtbag
04-14-2011, 1:02 PM
anyone use the harbor freight tubing notcher? Its $44, with the 20% off coupon in the back of popular mechanics it would be under $40 and might be a big time saver.

I believe those quickly get slop in the bushing ,I have a jd2 and mostly notch with my grinder ,die grinder then file,once you get a technique it goes quick

dertyD
04-22-2011, 7:11 AM
ahhh yeah!

rider728
04-25-2011, 12:08 PM
anyone know of a good solution for coping solid round stock? does the same die grinder + round file method work well, or is there a quicker and/or more precise method that someone would like to share with the class? no lathes or mills, let's assume hand and power tools but no pro level equipment on this one.

RunninOnEmpty
09-24-2011, 7:47 AM
needed that

sohcool
09-24-2011, 8:03 PM
Good stuff... as long as dude doesn't do a writeup on welding. lol

There's another program that works really well for printing templates. I'll see if I can remember it, and if so, will post a link for it for everyone.

fenderbja
11-24-2011, 3:48 PM
great info - will definitely use - thanks

sandergecko
11-28-2011, 1:39 PM
While we're at it, this might come in handy:
http://metalgeek.com/static/cope.pcgi

MetulMunky
11-28-2011, 4:23 PM
anyone use the harbor freight tubing notcher? Its $44, with the 20% off coupon in the back of popular mechanics it would be under $40 and might be a big time saver.

i used one for years, if you add this needle bearing arbor, it will last a long time
http://www.summitracing.com/parts/OJJ-BEARING/

SquashThatFly
02-01-2012, 6:46 PM
anybody got any easier suggestions for coping stainless tube? My tubing notcher is set up for hole saws only and stainless eats them for breakfast.