Search found 53 matches

by HDB
Mon Oct 17, 2016 11:41 pm
Forum: Casting & Foundry Work
Topic: Kaowool harmed by flame
Replies: 16
Views: 8420

Re: Kaowool harmed by flame

Ok, thank you both!
by HDB
Mon Aug 29, 2016 2:32 pm
Forum: General Discussion
Topic: What brand of grinder is this?
Replies: 3
Views: 712

Re: What brand of grinder is this?

It's definately a Hilti:
Although my Polish is a bit off, it seems to be this one:

http://olx.pl/oferta/szlifierka-katowa- ... gkcah.html

1400Watt, not bad for a hand grinder. :-)
by HDB
Mon Aug 29, 2016 1:35 pm
Forum: General Discussion
Topic: What brand of grinder is this?
Replies: 3
Views: 712

What brand of grinder is this?

Does anyone know what type/brand of grinder this is? Someone gave it to me because it is (was) broken.

It's definately professional grade. I'm thinking Hilti but not too sure... Google left me inconclusive :)
20160829_200449.jpg
20160829_200512.jpg
edit: inline pics
by HDB
Thu Aug 18, 2016 3:13 am
Forum: Casting & Foundry Work
Topic: Kaowool harmed by flame
Replies: 16
Views: 8420

Re: Kaowool harmed by flame

It would be very interesting to know the brandname, especially if it mentions the chemicals used.
by HDB
Sat Aug 13, 2016 3:16 am
Forum: Casting & Foundry Work
Topic: Kaowool harmed by flame
Replies: 16
Views: 8420

Re: Kaowool harmed by flame

Comstock-Friend wrote:
If we were firing with gas or oil, we would have the 1" thick outer layer rigidized (it would come wet in poly bags and dry up after you formed it into the furnace liner). Would last 2 plus years in 24/7 chemical plant operation.

John
Interesting!
What 'liquid' was used to soak the kaowool into?
by HDB
Thu Aug 04, 2016 11:50 am
Forum: Casting & Foundry Work
Topic: Annealing cast iron bar stock
Replies: 15
Views: 8260

Re: Annealing cast iron bar stock

BTW,

I just cut the bar in 2, and the center is soft. So definately chilled on the outsides. Did spark test and compared it to the cast iron I used for the melt, identical sparks. Not a lot of sparks though.
by HDB
Thu Aug 04, 2016 10:01 am
Forum: Casting & Foundry Work
Topic: Kaowool harmed by flame
Replies: 16
Views: 8420

Re: Kaowool harmed by flame

Yeah, your wrong, at least in the way that you are trying to use it. Kaowool melting temperature is 3200F, maximum use temperature is: Kaowool/Kaowool RT** - 2000F continuous, 2300F intermittent Cerablanket - 2150F continuous, 2400F intermittent Cerachem/CeraChrome - 2500F continuous, 2600F intermi...
by HDB
Thu Aug 04, 2016 9:46 am
Forum: Casting & Foundry Work
Topic: Annealing cast iron bar stock
Replies: 15
Views: 8260

Re: Annealing cast iron bar stock

Melting cast iron in a crucible is, and has always been, a crap shoot, for reasons already mentioned. I understand. But for now it's all that I have. I do believe that, under good conditions (running rich, not to long heating/overheating,...) good results are still possible and repeatable. The prol...
by HDB
Thu Aug 04, 2016 9:28 am
Forum: Casting & Foundry Work
Topic: Annealing cast iron bar stock
Replies: 15
Views: 8260

Re: Annealing cast iron bar stock

Yes indeed, you have 'white iron' or chilled iron that has little carbon lattice. No amount of reheating will induce carbon into this , and it may be that you cooked the carbon out of the iron to begin with. So a spark test should give me a good indication of the carbon content, right? Are there ot...
by HDB
Thu Aug 04, 2016 9:20 am
Forum: Casting & Foundry Work
Topic: Annealing cast iron bar stock
Replies: 15
Views: 8260

Re: Annealing cast iron bar stock

The fault is your iron mold. That's how foundries purposely 'chill' the cast iron to make it hard. Sand molds don't cool the iron quickly and don't create the problem. Even then, you don't want to knock the casting out of the mold until it's cooled quite a bit. Pete Okay, so that would mean that th...
by HDB
Wed Aug 03, 2016 4:38 am
Forum: Casting & Foundry Work
Topic: Annealing cast iron bar stock
Replies: 15
Views: 8260

Re: Annealing cast iron bar stock

Thanks for the interesting replies. I'm gonna reply in depth to each reply when I have more time. I'm going to do some tests (cut a thin piece and try to harden /temper/anneal this, spark test, break it for grain structure,... If it's due to carbide forming, maybe I'll have to reheat it much more......
by HDB
Wed Aug 03, 2016 4:22 am
Forum: Casting & Foundry Work
Topic: Kaowool harmed by flame
Replies: 16
Views: 8420

Re: Kaowool harmed by flame

Rock wool is light weight and suitable for hung insulation up to red heats. Lining an old fridge cabinet can give you a paint oven, or burnout cabinet for de-waxing. Using it as a fire wall or gun target as in a furnace for melting will give you fits, as you are finding out. The furnaces I built I ...