Go Back   RIBnet Forums > RIB talk > Other stuff
Click Here to Login

Reply
 
Thread Tools Search this Thread
 
Old 01 September 2007, 12:37   #21
Member
 
Country: USA
Town: Fairfield
Boat name: Sunrider
Make: Zodiac
Length: 7.3
Engine: MerCruiser (bio)diesel 180hp I/O
Join Date: Jun 2002
Posts: 313
I live in a part of the country (USA) where no custom fabrication for the marine industry is done and have been unable to find anyone who can make radar arches or grab rails, so have been considering whether to buy a bender....but don't do enough work to justify the cost I don't believe. In my research I found this summary of bending methods with different types of benders, and the results they produce: http://www.oceanmachinery.com/how-to...e-and-tube.htm
__________________
sunrider is offline   Reply With Quote
Old 01 September 2007, 12:58   #22
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Depends how much you want to spend.

http://search.ebay.com/tube-bender_W...opZ3QQsbrsrtZd

Quite a few on Ebay.

These looks promising for sensible money - may even import one myself.

http://cgi.ebay.com/Model-3-Tube-Ben...QQcmdZViewItem

and

http://cgi.ebay.com/JD2-Model-3-Tube...QQcmdZViewItem
__________________
codprawn is offline   Reply With Quote
Old 01 September 2007, 13:22   #23
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
Just found this on EBAY uk - a proper 360 degree bender!!!

http://cgi.ebay.co.uk/Tube-Bender-Pi...QQcmdZViewItem

£500 though.
__________________
codprawn is offline   Reply With Quote
Old 02 September 2007, 10:39   #24
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 5,596
Quote:
Originally Posted by jwalker View Post
...I'll snap a picture of a bend for you and you can decide.
.
Attached Thumbnails
Click image for larger version

Name:	bend.jpg
Views:	227
Size:	45.6 KB
ID:	29761  
__________________
JW.
jwalker is offline   Reply With Quote
Old 02 September 2007, 14:10   #25
Member
 
Country: UK - Wales
Town: Southampton
Boat name: DynaMoHumm/ SRV/deja
Make: Avon8.4, 5.4 & 4.777
Length: 8m +
Engine: Cat3126 Yam 90 &70
MMSI: 42
Join Date: Dec 2003
Posts: 6,562
Quote:
Originally Posted by jwalker View Post
.

I saw some crackin stainless bending work outside of a new Argos store locally....I have to admit I had some bad thoughts about an angle grinder and 2am....

wouldn't be the 1st time you nicked something with your Angle grinder would it! Poor old gArfie is still missing his tractor cab
__________________
Here it comes again, I don't stand a chance
Soul possession, Got me in a trance
Pullin' me back to you - Deja Voodoo
Rogue Wave is offline   Reply With Quote
Old 02 September 2007, 16:37   #26
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,866
That looks OK, I might see if I can borrow a conduit bender, I've a piece of 1" tube I can test bend.

You haven't got one have you Stu?
__________________
Andy

Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
Hightower is offline   Reply With Quote
Old 02 September 2007, 18:59   #27
Member
 
Country: UK - Wales
Town: Southampton
Boat name: DynaMoHumm/ SRV/deja
Make: Avon8.4, 5.4 & 4.777
Length: 8m +
Engine: Cat3126 Yam 90 &70
MMSI: 42
Join Date: Dec 2003
Posts: 6,562
I used to have one.......I'll go halvsies with you on that bender
__________________
Here it comes again, I don't stand a chance
Soul possession, Got me in a trance
Pullin' me back to you - Deja Voodoo
Rogue Wave is offline   Reply With Quote
Old 03 September 2007, 14:01   #28
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,866
Tig welders/inverters

Might well take you up on your offer Stu.

So this brings me onto TIG welders.

What's the minimum Amperage I could get away with for welding 1" diameter tubing to a good standard? I've used a 140 amp one before but can't remember what amperage I used, I seem to think it was about 100ish amps.
The other thing is that the higher amperage ones need a 16A supply at 240v's.
__________________
Andy

Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
Hightower is offline   Reply With Quote
Old 03 September 2007, 14:22   #29
Member
 
Country: UK - Wales
Town: swansea
Boat name: Too Blue
Make: BLANK
Length: 8m +
Engine: Suzuki DT225
Join Date: Mar 2004
Posts: 12,791
I know they SAY that you need a higher amp supply but I have used a 205amp Mig - a 165 amp tig and a 30 amp plasma cutter on a normal 13amp supply - along with a 3hp 14cfm air compressor. No problems at all - mind you I have proper fuses and not trip switches - I suspect they are more tolerant.
__________________
codprawn is offline   Reply With Quote
Old 03 September 2007, 23:13   #30
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 5,596
Quote:
Originally Posted by Hightower View Post
So this brings me onto TIG welders.

What's the minimum Amperage I could get away with for welding 1" diameter tubing to a good standard?
Usually around the 45-55amp range. I rarely go past 60amps even on quite thick sections. Are you thinking about a real TIG welder or an inverter?
__________________
JW.
jwalker is offline   Reply With Quote
Old 04 September 2007, 06:37   #31
RIBnet supporter
 
bedajim's Avatar
 
Country: UK - England
Town: Rutland
Length: no boat
Join Date: May 2006
Posts: 2,500
Quote:
Originally Posted by jwalker View Post
Usually around the 45-55amp range. I rarely go past 60amps even on quite thick sections. Are you thinking about a real TIG welder or an inverter?
I went the inverter route from BOC, they had a demo week and were offering some great deals on the demo kit.
__________________
bedajim is offline   Reply With Quote
Old 04 September 2007, 09:34   #32
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,866
I was thinking inverter here, I had a chat with a couple of welding supply places locally yesterday and they where offering units/packages (without gas) for around £650, they said that the cheaper inverters that machine mart sell are utter rubbish (but then they would, wouldn't they), but I'm trying to keep cost down and am really only interested in doing the stainless for my boat.

So are the cheaper, Machine Mart ones any good? £750 for a set to include 30 litres of Argon Gas isn't expensive compared to other welding sets, but not as bargain basement as I could go.

What do you think?
__________________
Andy

Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
Hightower is offline   Reply With Quote
Old 04 September 2007, 09:49   #33
RIBnet supporter
 
bedajim's Avatar
 
Country: UK - England
Town: Rutland
Length: no boat
Join Date: May 2006
Posts: 2,500
Quote:
Originally Posted by Hightower View Post
I was thinking inverter here, I had a chat with a couple of welding supply places locally yesterday and they where offering units/packages (without gas) for around £650, they said that the cheaper inverters that machine mart sell are utter rubbish (but then they would, wouldn't they), but I'm trying to keep cost down and am really only interested in doing the stainless for my boat.

So are the cheaper, Machine Mart ones any good? £750 for a set to include 30 litres of Argon Gas isn't expensive compared to other welding sets, but not as bargain basement as I could go.

What do you think?
Just how much stainless are you having
__________________
bedajim is offline   Reply With Quote
Old 04 September 2007, 09:58   #34
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,866


Only seat backs and railings, but the cost of this is 200 for each seat back, the same for a large handrail for the console, then I have other stainless bits I'd like to add like a bow rail to protect the tubes, the Mast for the back and some hand rails around the rear quarters. So I recon there's a thousand quids worth of work involved.

If I can buy a welding set and a bender for about £700 then I'm already quids in. Stainless tube is about £5 per meter so 6m lengths are £30/seat back etc.

And I've got a welding set to boot.
__________________
Andy

Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
Hightower is offline   Reply With Quote
Old 04 September 2007, 10:38   #35
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 5,596
My unit is a Machine Mart inverter and it's given and still gives, sterling service. I did have a chat with the BOC folk and one of the listed feaures of their inverter was the ability to strike the arc without having to touch the surface to be welded. Touching the weld surface contaminates the tungsten. This appears to be a good feature and would allow the best of welds to be produced. If I'm very careful my inverter will do this but the tungsten is only a part of a millimeter from the surface and it's easy to shake slightly and make contact. A welding shield which you can see through while striking the arc is pretty much essential. Mine is powered by a wee solar panel and it's never not darkened even when welding in dull circumstances.

One thing to note is that you can't weld aluminium with an inverter because they are DC units and AC is required for ally.
__________________
JW.
jwalker is offline   Reply With Quote
Old 04 September 2007, 10:41   #36
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,866
Yeh, didn't want to do Ally anyway and I haven't got a spare £1250 anyway

So might be a trip to Machine Mart then
__________________
Andy

Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
Hightower is offline   Reply With Quote
Old 04 September 2007, 10:47   #37
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 5,596
Remember to factor in a packet of tungstens and a couple of kilos of welding rod. If you get your tungstens from BOC there is a particular type to get and my BOC depot has to order them for me. It's to prevent you poisoning yourself so I'll see if I can find the info you need. There are different diameter tungstens also. I've used two sizes but always come back to one particular diameter...I think it's 2.5mm but I'll check. Back shortly. Oh yeh, while I remember.. you'll need leather gloves and the softer the better cos you need to be able to feel the welding rod while you feed it through your fingers. Big clumpy gloves make it difficult to do.
__________________
JW.
jwalker is offline   Reply With Quote
Old 04 September 2007, 10:58   #38
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 5,596
Cancel that. The rods are 1.6mm the 2.5's are too agressive. They are known as ceriated (they contain 2% cerium) and they have grey painted tips. This is an indication of their type. It's ages since I learned this stuff but I seem to remember non-ceriated tungstens produce some cyanide while you're welding.
__________________
JW.
jwalker is offline   Reply With Quote
Old 04 September 2007, 11:09   #39
Member
 
Hightower's Avatar
 
Country: UK - England
Town: Fareham
Length: 6m +
Join Date: Sep 2003
Posts: 7,866
My company has an inverter it's this one here the trouble is that to borrow it I''d have to convince the MD of the maintenance dept. to part with it for a weekend and would have to purchase another TIG welding gun as people keep loosing bits of the gun .

If you never ask you'll never know I suppose.
__________________
Andy

Looks Slow but is Fast
Member of the ebay Blue RIB cover club.
Hightower is offline   Reply With Quote
Old 04 September 2007, 11:24   #40
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 5,596
I see they are featuring the easy striking ability. It must be a well known limitation of inverters. You do become skilled at starting the arc within a short time so I wouldn't be too concerned about it.
__________________
JW.
jwalker is offline   Reply With Quote
Reply


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




All times are GMT. The time now is 22:54.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.