Thanks: 0
Needs Pictures: 0
Picture(s) thanks: 0
Results 16 to 30 of 30
-
4th September 2013, 09:56 PM #16
There seems to be more interest in shuffling company shares around these days than considering what the company actually does. As a result there is a lot of blurring of lines etc. I personally feel that share trading is a bit like advertising. A lot of money goes round and round but the actual benefit to the general population is zero.
When I am bored at work, watching a long operation I often read Reuters News cos it is built in to my phone and I thought it would be a good news source. I find it funny that the "Technology" section is about 99% finance news from Tech companies.
Dean
-
4th September 2013 09:56 PM # ADSGoogle Adsense Advertisement
- Join Date
- Always
- Location
- Advertising world
- Age
- 2010
- Posts
- Many
-
4th September 2013, 11:18 PM #17Senior Member
- Join Date
- Oct 2011
- Location
- Newstead Victoria
- Posts
- 459
-
5th September 2013, 08:48 AM #18SENIOR MEMBER
- Join Date
- Aug 2008
- Location
- Charlestown NSW
- Age
- 65
- Posts
- 899
I spoke to our metallugist yesterday and he reckons what they are calling "semi steel" will be SG Ductile cast iron (SG being "speroidal graphite") Apparently it increases the toughness of the cast iron. He also went in to a lot of detail as to the actual percentages of carbon etc and even how the graphite forms balls coated with iron etc etc.
bollie7
-
6th September 2013, 06:48 PM #19Member
- Join Date
- Dec 2008
- Location
- Melbourne
- Posts
- 52
Before you get the welder out.....
Good to see sustainability in action, reduce, reuse, recycle. I am not sure if you have a machine shop available to you but if you do there may be another way to fix your new find.
A possible way to repair the vice is to machine the worst section of the damaged area completely away and replace the "lost metal" with a plate screwed in place. If you use SHCS's from the underside, the threads will be in the new material which could be steel, not iron. High end toolmakers vices are often made from a number of components and are bolted together. It was also a common apprentice project when they actually taught you something in trade school. So if you have the time before you start, prepare a drawing or two as it may may help with the decisions you will be making,
The thicker sections in the base casting help with the ability of the vice to be rigid on tightening and to hold the moveable jaw in place when it is clamping. The flat faces top and bottom absorb any bearing loads and the keeper on the underside, more correctly the clearance of the keeper, stops the jaw from opening like a clam when you tighten it. Given you could put the right sized material back in place and fasten securely (this is where the drawing will help), it could be entirely practical to machine away the complete raised section back to the screw end of the vice and replace the thicker strip entirely. It would look very neat as well. Sundry holes away from the main damaged area could be devcon repaired, even auto putty for the smaller ones outside and you could paint over them after. They do not influence the function of the vice. Dawn was a good product and the fact it got this much hammering in the workshop and survived............
A laminated beam can have the same strength as a solid beam, sometimes it can be better in bending. I have had some incredible success with welding cast iron and some notable failures. I found the amount of oil remaining in the metal structure was one of the major issues when welding and a contributor to porosity in the deposited weld and bad adhesion / transition in the HAZ. If you do weld, really give it a good clean. Blind holes are nasty to get perfect in any material, be careful,
regards mgtoolmaker
-
9th September 2013, 05:40 PM #20SENIOR MEMBER
- Join Date
- Jun 2012
- Location
- SA
- Posts
- 1,478
More metal eating white ants
Bought these two items today off Gumtree for $20 - which I thought wasn't too bad.
v1.jpgv2.jpg
The rats have been at the big one, but the little vice is quite good.
Need jaw plates as well, but that's Ok as I have a set under the bench - somewhere
So looks like I will be doing some cast welding and peening pretty soon as well.
Damn metal white ants are everywhere.
Rob
The worst that can happen is you will fail.
But at least you tried.
-
9th September 2013, 07:12 PM #21
Sorry guys but the item is iron, admittedly ductile iron ,but still iron never the less.
It shouldn't take a genius to work out that that a 7018 maganese steel electrode it not really compatible with cast iron.
It is to do with the carbon content of the cast iron which will probably run maybe 4-7 %. The vice is not subject to compressive forces but tensile ones and while a LH rod might stick it up somewhat , there will will be root cracking,you betcha! and that stuck together condition won't last for long.
If you must weld use a nickel based rod, but remember the cost of the vice may be exceeded by the purchase price of the packet of nickel rods.
The vice can probably be replaced under $200. I have that exact model purchased 18 months back for about $125.The $400 model is the super quality jobbie .
You can pick this one as it's machined on 4 faces.
Brazing with a nickel bronze filler will be the most cost effective and does not take a heap of skill.
Just my opinion for what it is worth.
Grahame
-
9th September 2013, 08:35 PM #22
-
19th September 2013, 06:40 PM #23SENIOR MEMBER
- Join Date
- Jun 2012
- Location
- SA
- Posts
- 1,478
Weling up a cast iron vice with standard steel welding rods
Further to this discussion, I decided to try my hand at welding up a drill press vice I have which was in similar condition to the one of the OP. See photo in my previous post.
But instead of using cast welding rods, I used a technique I saw on YouTube using ordinary GP welding rods and peening. No pre-heating.
I used some ancient 10 gauge GP rods at 130 amps and my air needle descaler as a peen while the weld was still red hot.
You can see the progress below.
w1.jpgw2.jpgw4.jpgw5.jpgw6.jpg
I didn't go to a lot of trouble on this, and there's a few air holes, but too bad. The overall job turned out OK.
Next I will make up some jaw plates to finish it off.
RobThe worst that can happen is you will fail.
But at least you tried.
-
19th September 2013, 07:31 PM #24
-
19th September 2013, 08:12 PM #25SENIOR MEMBER
- Join Date
- Jun 2012
- Location
- SA
- Posts
- 1,478
-
19th September 2013, 10:00 PM #26SENIOR MEMBER
- Join Date
- Jun 2012
- Location
- SA
- Posts
- 1,478
Stick welding rods used
The rods I used were Murex (contex) 7014 equivalent 10 gauge.
These are all position, low penetration mild steel rods.
Contex is an old Murex line no longer available or listed.
RobThe worst that can happen is you will fail.
But at least you tried.
-
19th September 2013, 10:19 PM #27GOLD MEMBER
- Join Date
- May 2011
- Location
- Murray Bridge SA
- Posts
- 3,339
You turned out a neat job Rob. Is it ready for another round of Metal Ants
Kryn
-
19th September 2013, 10:25 PM #28SENIOR MEMBER
- Join Date
- Jun 2012
- Location
- SA
- Posts
- 1,478
Thanks Kryn. Looks a bit better than when I started
No metal ants in my shed. But must be plenty in other places.
I didn't bother trying to fill in the air holes. The problem is that you only know you've got them when you grind back.
Doing it this way preheating may help, but I didn't, so I had to keep moving to keep the temperature up. All the cleanup was after it cooled down.
Never done it this way before, but it seems to have bonded well, and very little edge burn like you get with cast rods. Being nodular cast iron (I presume) may also help.
RobThe worst that can happen is you will fail.
But at least you tried.
-
20th September 2013, 12:57 PM #29Senior Member
- Join Date
- Nov 2007
- Location
- mid north coast NSW
- Posts
- 148
Nearnexus, That has come up well, not quite a "silk purse" but very usable! The small vice looks quite different from a normal drill vice? any chance of a close up photo.
Graeme
-
20th September 2013, 01:35 PM #30SENIOR MEMBER
- Join Date
- Jun 2012
- Location
- SA
- Posts
- 1,478
It was never going to be a silk purse
The small unit is a pipe vise.
I modified it a bit to make it do round and square stock.
v1.jpg
Not bad for $10.
Cheers
RobThe worst that can happen is you will fail.
But at least you tried.
Similar Threads
-
Cast iron pot repair
By lordnelson in forum METALWORK FORUMReplies: 19Last Post: 12th October 2011, 08:36 PM -
Cast iron table repair
By neksmerj in forum METALWORK FORUMReplies: 14Last Post: 22nd June 2011, 07:18 PM -
Cast iron repair for table saw arbor arm
By kman-oz in forum WELDINGReplies: 4Last Post: 27th July 2010, 02:11 PM -
Cast Iron Weld Repair
By Woodlee in forum WELDINGReplies: 4Last Post: 22nd June 2008, 10:13 PM -
Repair of Broken Cast Iron
By Grahame Collins in forum METALWORK FORUMReplies: 0Last Post: 11th February 2006, 11:35 PM