|Nick Clarke 3||23/10/2019 09:26:08|
679 forum posts
In older copies of the magazines it was always mentioned to pack work being brazed well with coke before brazing with paraffin blowlamps. Even as recent as the earlier Don Young and Tubal Cain articles.
Is there any reason why this is not used today? (or is it?) as coke or breeze is still available and as a way to generally heat a workpiece together with more localised heating it seems like it could still be useful.
|5612 forum posts|
Is coke generally available? Last time I looked to buy some it was unobtainium in small quantities. (I did find a local coal merchant selling it by the ton.) Coke was common when domestic gas was made by baking coal but we all burn natural gas now. Now coke is specially made for steelworks etc and doesn't seem to be sold as ordinary fuel in bags. Or at least I couldn't find any!
Coke being porous and mostly carbon makes it a good insulator for hot work. Good stuff if you can find it. I'd look at Vermiculite instead, not because it's marvellous or cheap, but because it's available.
|Mike Poole||23/10/2019 10:59:33|
2538 forum posts
I suppose breeze blocks will soon be a thing of the past as one of the major ingredients was ash from coal fired power stations.
|Clive Brown 1||23/10/2019 11:08:17|
|402 forum posts|
A benefit of using coke would be the extra heat generated by its combustion. This might be less useful now with the availability of poweful propane torches, compared with the fearsome 5 pint blowlamp of old.
|not done it yet||23/10/2019 11:12:10|
|4488 forum posts|
More ash and alkalis, but charcoal might be a reasonable substitute these days, if you really want to go that route for brazing. Arrange to do your brazing after the BBQ?
|2489 forum posts|
Blacksmiths use Coke “beans”.
An alternative may be lumpwood charcoal?
5132 forum posts
Coalite is a brand named supply of coke, in fact any of the 'smokeless' bagged fuel on garage forecourts will be coke. Coke is used in steelmaking instead of coal after driving off the sulphur and hydrocarbons that would contaminate the steel. These are the same constituents that cause smoke, smog and smells that the use of smokeless fuels avoids in clean air zones.
It was used as an insulator primarily in boilermaking but with the sort of advantage of also burning. if there was enough draught. In the 'fifties before north sea gas made gas heating cheaper than coal probably 95% of model engineers had coal and coke at home already. Charcoal would not be very good as it would catch and burn too readily.
|Nick Clarke 3||23/10/2019 16:18:37|
679 forum posts
This is where I have seen it - close to me, but perhaps not to you.
|julian atkins||23/10/2019 20:24:28|
1232 forum posts
Go down to your local builders merchants and buy some Thermalite blocks or equivalent. Very cheap, and can be cut up if required with an old wood saw.
The 5 pint paraffin blow lamp used by Don Young on the only 2 boilers he ever made is a fearsome beast! I doubt if Don did use coke as a surround for his 2 boilers. I used a 5 pint paraffin blow lamp on the first joints on my first miniature locomotive boiler until I bought my Sievert set (propane). The heat output from a 5 pint paraffin blow lamp is quite something.
You would not want raw coke igniting when silver soldering a boiler. You want clean joints and heat that is controlled where you want it to be.
You need to take some of what Don Young wrote with a pinch of salt (hefty doses in places)! Don's 5"g LNER K1/1 boiler was probably silver soldered up in the works of J Samuel White. Don's 5"g IW O2 "Fishbourne" boiler was probably done by him with the old 5 pint blow lamp, but the loco never had a steam up on a track when completed, and was sold in the late 1960s (to Canada) and has never been seen since. Neither boiler ever had a club boiler certificate.
Don's only other loco was his 5"g Railmotor No.1 and Alec Farmer of Reeves made the boiler for Don.
Please login to post a reply.
Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!
You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.
Click THIS LINK for full contact details.
For subscription issues please see THIS LINK.