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1st March 2013, 11:34 PM #1
Looking for some Fully annealed Grey Cast Iron
G'day chaps
If i don't have any luck here then I'll talk to Interlloy on Monday, but I'm looking for 3 pieces of fully annealed grey cast iron, probably 10mm thick and 220-250 x 70-90mm.
Just wondering if anyone may be able to help. Happy to pay appropriate money.
Cheers
Brett
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2nd March 2013, 05:58 AM #2SENIOR MEMBER
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Hi Brett,
I may have some.
How critical are the dimensions? I'm not sure of the dimensions of the pieces I have and won't be able to check until later today.
I'll report back
Phil
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2nd March 2013, 08:53 AM #3.
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Hey Phil,
Where would you have acquired cast iron with such dimensions? ( if it's a secret scrap source don't tell me ). Over here I resort to buying round bar from Bohler and cutting the bar into a rectangular or whatever section on the mill. I did manage to purchase some 80 x 50 4E from Interlloy about 4 years ago but sadly I have little of it left. I have never seen thin cast bar.
Bob.
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2nd March 2013, 09:31 AM #4Philomath in training
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Bob
Surman metals (Suman Metals: Cast Iron) do CI as well as Al and brass/ bronze/ copper. The CI page state that they do flats, so perhaps give them a call or send an email. They sell by the kg - minimum 1kg (although their scales are a bit dodgy around that), and can probably arrange freight. Plan B for Scrapefest II was getting some of their CI if Phil couldn't find it locally.
If they won't ship they are about 15 minutes from the new premises so I could collect an order and post it on.
Michael
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2nd March 2013, 10:04 AM #5
Hi Phil. Not terribly critical. I'm going to use them as honing plates with diamond paste for plane blades and chisels. I'll flatten them with abrasive sheets on a granite plate, maybe a bit of draw filing to begin with (depending on face condition). So:
- minimum width of 70mm
- minimum length of 200mm
- thick fairly irrelevant, but for stability I'd say minimum 8mm (but would be guided by other expertise). Not too thick to keep the weight down
- doesn't matter if the two faces aren't parallel - I'll be using both faces for two different grits, allowing 6 grits altogether - (say) 600 grit one side, 1200 on the other, place them on double width non-slip rubber mat and flip it over (write the grit # on the mat to avoid cross-contamination)
- doesn't matter if there are a few dags on the edges - file them off
- doesn't even particularly matter if they aren't square (ish)
Thanks for looking
Brett
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2nd March 2013, 10:07 AM #6
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2nd March 2013, 11:33 AM #7SENIOR MEMBER
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HI Bob,
Funny (insane) story, we have a boiler at work that someone discovered asbestos in and consequently it had to be removed, the boiler that is. It turned out that I was the only person who had the necesary equipment to contain the asbestos and cut the adjoining pipes for the safe removal. This is what I have been doing all week and not on contractors rates. I noticed the cast bars that were a part of the boiler, the non asbestos covered part, and asked if I could have them. My request was granted. Fair trade I thought.
99 tubes in all and 4" diameter and you can see the asbestos in the middle picture. I slept a couple of nights dreaming about oxy cutting
IMG_3109.jpgIMG_3108.jpgIMG_3107.jpg
Hi Brett,
I have measured the bars and they are 1" thick approx 25mm and 3 3/8" approx 85mm wide. This particular piece is about 2 metres long so there should be enough
They have rust but should clean up well.
Oh yeah, I couldn't do a spark test so drilled a bit to make sure they were cast Iron.
Phil
IMG_3154.jpgIMG_3153.jpg
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2nd March 2013, 11:45 AM #8
Cracker! Should be hefty enough!
Would you be able to cut 3 lengths of 220mm please?
The next part is optional, and feel free to say no: Just considering the rust, and wondering how deep it goes, and also the over-the-top heft for this application, do you have the facility to reduce the thickness to maybe 15mm (taking off about 5mm from each side)? Happy to pay you for your time, or I can get someone up here if it's not your bag.
Thanks Phil, much appreciated (whatever you can do)
Brett
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2nd March 2013, 02:16 PM #9SENIOR MEMBER
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Hi Brett,
I cut the end off with the hole that I drilled and put it on the little Douglas shaper to see how it would go (see pics)
What do you think? I haven't reduced the thickness just cleaned it up.
One other thing is, how parallel do you want the faces? The Dougie is all over the shop at the moment for machining square (another job on the list) . They won't be too bad but also wont be perfect.
Phil
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2nd March 2013, 02:48 PM #10
Wow, what a champion! That's really living the spirit of the forum Phil.
Parallel faces don't matter, nor does anything more than eyeball square (or less).
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2nd March 2013, 03:23 PM #11
Btw, when you say "spark test"....no comprende....
I did study Materials Science as a strand of Industrial Arts several previous lives ago, but it's all pretty misty now. Looking at that block it appears to have a reasonably large grain - is that how you tell what annealing it's had?
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2nd March 2013, 05:20 PM #12
Re the annealing comment. If its lived in a boiler, I would have the thought the cast iron iron would be well and truly annealed by now. The finished CI is clearly grey iron. It's the white cast iron that is susceptible to hardening. I have seen some hard cast iron destroy the stones on a surface grinder so I understand your concern.
Grahame
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2nd March 2013, 06:48 PM #13SENIOR MEMBER
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2nd March 2013, 06:49 PM #14SENIOR MEMBER
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Thanks Graham, you took the words right off my keyboard
With regards to the spark test Brett, Cast Iron gives off a particular type of spark when you hit it with a grinder that I will try (in my inimatable style) to explain.
Hard steel will give off a bright explosive spark and I guess Cast Iron is the opposite, dull and unexplosive
Phil
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2nd March 2013, 06:59 PM #15SENIOR MEMBER
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