LocostUSA.com

Learning how to build Lotus Seven replicas...together!
It is currently May 24, 2018, 9:30 pm

All times are UTC - 5 hours [ DST ]




Post new topic Reply to topic  [ 19 posts ]  Go to page 1, 2  Next
Author Message
 Post subject: Coping tube (Round)
PostPosted: February 13, 2017, 1:06 pm 
Offline

Joined: July 24, 2008, 9:18 pm
Posts: 224
I'm building using chromoly round tube. I have a full size Bridgeport Mill. But i do not really want to to use this. I would much rather use a tube notcher that uses a drill or sits under a drill press.

Anyone here used one and have a good reccomendation?

Also, did you just use a hole saw? I have never liked these for cutting anything. But end mills are much more expensive and wear faster in this case. I'm looking for a best bang for the buck in this scenario.

_________________
Plans: Single Rotor turbo sub 1000lb machine!


Top
 Profile  
Reply with quote  
 Post subject: Re: Coping tube (Round)
PostPosted: February 13, 2017, 1:18 pm 
Offline
User avatar

Joined: December 7, 2012, 8:28 am
Posts: 1406
Location: Sarasota
My preferred method is to just use and angle grinder. Its a little more fiddly but I have had zero luck with hole saws especially trying to cut at an angle.
https://www.youtube.com/watch?v=nbK4QGJ8ZSU

_________________
2015 & 2016 EMod Florida State Autocross Champion
2013 & 2014 DSP Florida State Autocross Champion

Scrap Metal Build Log viewtopic.php?f=35&t=14558


Top
 Profile  
Reply with quote  
 Post subject: Re: Coping tube (Round)
PostPosted: February 13, 2017, 1:39 pm 
Offline

Joined: July 24, 2008, 9:18 pm
Posts: 224
I'm a little spoiled these days. I have cut V and ground it out many times before. Using different methods. It's just not how I do things these days.

I've read the Eastwood are hit or miss on quality. But are very cheap at around 80 bucks. I would love to get the JD2 Notch master. But at 270ish, I'm not sure I would use it enough to justify the cost. I have their JD2 bender, which is very good quality. But it holds my welding jacket up most of the year...

I priced out making one myself. Not really worth it at that point. Ideally, I would love to find an older used one.

_________________
Plans: Single Rotor turbo sub 1000lb machine!


Top
 Profile  
Reply with quote  
 Post subject: Re: Coping tube (Round)
PostPosted: February 13, 2017, 1:47 pm 
Offline
Mid-Engined Maniac

Joined: April 23, 2006, 8:26 pm
Posts: 5858
Location: SoCal
I went through the exact same thought process regarding getting tubes bent. I could have bought a bender for what I paid to have them bent, and ordinarily would have gone that way. The thing about a bender is, like the above, it's something very specialized and therefore hardly ever used in most of our garages. Then there's that I simply don't have room to store all the stuff I used once then set aside.

_________________
Midlana book: Build this mid-engine Locost!, http://www.midlana.com/
Kimini book: Designing mid-engine cars using FWD drivetrains, http://www.kimini.com/book_info/


Top
 Profile  
Reply with quote  
 Post subject: Re: Coping tube (Round)
PostPosted: February 13, 2017, 1:53 pm 
Offline
User avatar

Joined: October 19, 2012, 9:25 pm
Posts: 2687
Location: Summerville, SC
For a quality fit, you won't beat your milling machine. Eastwood depends on which Chinese vendor they stick their name on this week.

For simplicity nothing beats a cutting torch or angle grinder.

You can also get dam fine results with a chop saw if you know what you're doing.
https://www.youtube.com/watch?v=mHBanmfn_CA

_________________
Too much week, not enough weekend.

OOPS I did it again
http://www.locostusa.com/forums/viewtopic.php?f=35&t=17496

Blood Sweat and Beers
http://www.locostusa.com/forums/viewtopic.php?f=35&t=15216


Top
 Profile  
Reply with quote  
 Post subject: Re: Coping tube (Round)
PostPosted: February 13, 2017, 2:34 pm 
Offline
User avatar

Joined: October 23, 2010, 2:40 am
Posts: 1022
Try software like this to make a pattern of the fish mouth you need
http://digitalpipefitter.com/ (free download)
then use an angle grinder with a cutoff wheel to rough it out and finish with a die grinder (large burr).

_________________
Cheers, Tom

My Car9 build: viewtopic.php?f=35&t=14613
"It's the construction of the car-the sheer lunacy and joy of making diverse parts come together and work as one-that counts."

Ultima Spyder, Northstar 4.0, Porsche G50/52


Top
 Profile  
Reply with quote  
 Post subject: Re: Coping tube (Round)
PostPosted: February 13, 2017, 2:58 pm 
Offline
User avatar

Joined: October 19, 2012, 9:25 pm
Posts: 2687
Location: Summerville, SC
seattletom wrote:
Try software like this to make a pattern of the fish mouth you need
http://digitalpipefitter.com/ (free download)
then use an angle grinder with a cutoff wheel to rough it out and finish with a die grinder (large burr).


That's nice. We had to learn to do math in pipefitting class. Divide a pipe into 8 sections and do 4 calculations, 6 if it was an odd angle. Transfer the setbacks onto the pipe and freehand the curve with soapstone.
You can get remarkably good at cutting a 45 degree bevel over a sweeping curve with a bit of practice using nothing but an oxy-acetylene torch.

_________________
Too much week, not enough weekend.

OOPS I did it again
http://www.locostusa.com/forums/viewtopic.php?f=35&t=17496

Blood Sweat and Beers
http://www.locostusa.com/forums/viewtopic.php?f=35&t=15216


Top
 Profile  
Reply with quote  
 Post subject: Re: Coping tube (Round)
PostPosted: February 13, 2017, 4:02 pm 
Offline

Joined: July 24, 2008, 9:18 pm
Posts: 224
I'm definitely not doing it by hand. Those days are over for me...

I might just have to go big time and spend the money on the JD2. I'm sure it will last my lifetime.

_________________
Plans: Single Rotor turbo sub 1000lb machine!


Top
 Profile  
Reply with quote  
 Post subject: Re: Coping tube (Round)
PostPosted: February 13, 2017, 4:31 pm 
Offline
User avatar

Joined: October 19, 2012, 9:25 pm
Posts: 2687
Location: Summerville, SC
sen2two wrote:
I'm definitely not doing it by hand. Those days are over for me...

I might just have to go big time and spend the money on the JD2. I'm sure it will last my lifetime.


:thmbsup:

_________________
Too much week, not enough weekend.

OOPS I did it again
http://www.locostusa.com/forums/viewtopic.php?f=35&t=17496

Blood Sweat and Beers
http://www.locostusa.com/forums/viewtopic.php?f=35&t=15216


Top
 Profile  
Reply with quote  
 Post subject: Re: Coping tube (Round)
PostPosted: February 13, 2017, 4:32 pm 
Offline
User avatar

Joined: January 2, 2009, 1:45 pm
Posts: 1173
Location: Halifax, Nova Scotia
I bought from Aircraft Spruce - again not cheap. It worked well with ordinary bi-metallic hole saws, but as Kurt suggests, it hasn't had much use in a long time.

viewtopic.php?f=15&t=12812

_________________
Warren
Isuzu Pickup/SR20DE, +401 COLD frame
Build Log: viewtopic.php?f=35&t=11601


Top
 Profile  
Reply with quote  
 Post subject: Re: Coping tube (Round)
PostPosted: February 13, 2017, 5:54 pm 
Offline
User avatar

Joined: October 24, 2008, 2:13 pm
Posts: 3369
Location: Carlsbad, California, USA
I have the Harbor Freight version of what Warren has (http://www.harborfreight.com/pipe-tubin ... 42324.html). It works well enough. Long pieces are a challenge, but easier if you have an assistant. You often need to do some finish work by hand using files, or you can use a Dremel Tool with burrs attached. The latter is a much better approach, but it's easy to go too far if you use double cut burrs on 16 gauge material.

For $45 it isn't much of a gamble. Just get good quality hole saws like Lennox or similar and lubricate them when you cut. Harbor Freight hole saws will fail almost immediately.

Cheers,

_________________
Damn! That front slip angle is way too large and the Ackerman is just a muddle.

Build Log: viewtopic.php?f=35&t=5886


Top
 Profile  
Reply with quote  
 Post subject: Re: Coping tube (Round)
PostPosted: February 13, 2017, 8:00 pm 
Offline
Always Moore!
User avatar

Joined: November 9, 2007, 3:40 pm
Posts: 3927
Location: Fort Worth, TX
For roll cage tubing I like a hole saw in the drill press and some sort of device to hole the tube (tube notcher, vise on drill press, etc). The table tilts so I can make it whatever angle it needs to be.

For thinner stuff a bench grinder does just fine. Its rarely worth dealing with a hole saw since its going to require some fitting anyways.

_________________
-Andrew
Build Log
Youtube


Top
 Profile  
Reply with quote  
 Post subject: Re: Coping tube (Round)
PostPosted: February 13, 2017, 9:24 pm 
Offline
User avatar

Joined: April 15, 2011, 10:39 pm
Posts: 136
Location: Dallas, PA
Ive had a Pro Tools HSN-501i for 20 years and have built hundreds, yes, hundreds of rollcages for SCCA, NASA, Rally America and others competitors cars. Hole saw notchers are fantastic if you get a good unit and use it correctly. One standard Lenox hole saw will do an entire rollcage with ease!

_________________
Dan Lipperini Jr
www.RaceLabz.com


Top
 Profile  
Reply with quote  
 Post subject: Re: Coping tube (Round)
PostPosted: February 13, 2017, 9:55 pm 
Offline

Joined: August 28, 2010, 7:53 am
Posts: 173
i use hole saws in my bridgeport. I buy the hole saws with the built in arbor, then machine the arbor (in the lathe) to fit in a collet. Usually only have to take a little off and it really squares it up nicely. I don't use the drill bit. Then i use an angle finder and clamp it in a vise. Kinda like a giant notcher. Just feed slowly to avoid tearing the teeth off.


Top
 Profile  
Reply with quote  
 Post subject: Re: Coping tube (Round)
PostPosted: February 13, 2017, 10:21 pm 
Offline
Mid-Engined Maniac

Joined: April 23, 2006, 8:26 pm
Posts: 5858
Location: SoCal
Warren Nethercote wrote:
I bought from Aircraft Spruce - again not cheap. It worked well with ordinary bi-metallic hole saws, but as Kurt suggests, it hasn't had much use in a long time.

viewtopic.php?f=15&t=12812

Well, I did buy a tubing notcher... it saves so much time to have one as far as I'm concerned it paid for itself.

_________________
Midlana book: Build this mid-engine Locost!, http://www.midlana.com/
Kimini book: Designing mid-engine cars using FWD drivetrains, http://www.kimini.com/book_info/


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 19 posts ]  Go to page 1, 2  Next

All times are UTC - 5 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
POWERED_BY