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91
The Design Shop / Re: Truing diamond holder for TCG for surface grinding
« Last post by PekkaNF on February 10, 2019, 07:17:13 AM »
And it has worked - in several ocassions.

I was thinkking of "stocking up" few truing inserts and took a picture of the I have to assess the wear of it. Not much wear, clearly used, but still usable. However, it does not look like a "diamond". It was cheap, butt description said "diamond truing" etc.

No problem, because it seems to work on "blue" wheel.

BUT: Is there a prefered type of these or any ebayspecial will do?

Thank you
92
Metal Stuff / Re: Cast iron Sash window weights
« Last post by appletree on February 10, 2019, 04:40:55 AM »
Thanks for the replies, looks like they are worth having, I guess pre cut lengths could be put on the coal fire in the lounge to soften. Donít know what it is love must have come in with the coal.
Donít know what might happen to the carbon content?

Phil
93
Metal Stuff / Re: Cast iron Sash window weights
« Last post by awemawson on February 10, 2019, 04:32:23 AM »
You can always soften them again, heat to white hot and cool slowly.

Here's a large square one glowing nicely in my 100 kw induction furnace when I had it set up back in  2007

(just had to manually ramp down the power setting so it cooled slowly rather like you would with a pottery kiln to avoid cracking, which was easy as it's a  big knob on the control panel!)
94
Metal Stuff / Re: Cast iron Sash window weights
« Last post by kayzed1 on February 09, 2019, 07:04:29 PM »
I do not have a lot of experience in these things, but i do have some that came from a Very old house. One or two that are 4 feet long most round but again three or four that are square. All machine very well and not come across any hard spots ...YET!
Lyn. 
95
Metal Stuff / Re: Cast iron Sash window weights
« Last post by Pete. on February 09, 2019, 06:55:01 PM »
I brought four home from work, two smaller and two larger. There wan't a whole lot of difference between the sizes I think the larger ones were maybe 30% bigger but the two small ones were unmachinable and the two larger machined quite nicely. I've made quite a few bits and bobs from them.

Bottom line - it's a lottery. Depends on how quickly they were chilled I guess.
96
Metal Stuff / Re: Cast iron Sash window weights
« Last post by Mike E. on February 09, 2019, 05:23:17 PM »
They make great weights for bottom fishing off shore, Seriously, they seem to drop to the bottom faster and I would be reeling up fish while others on the boat were still peeling out line, less tangles for me as well.
97
Metal Stuff / Cast iron Sash window weights
« Last post by appletree on February 09, 2019, 04:26:42 PM »
Has anybody found sash window weight a useful source of  Cast Iron? Or are they too varied with hard spots to be usable?

I have just been given a dozen

Phil
98
Our Shop / Re: Shop heating
« Last post by shipto on February 09, 2019, 12:54:14 PM »
Shipto, you are chasing diminishing returns trying to capture that waste heat.  The exhaust system needs to be hot to get rid of moisture and combustion products.  If you pull too much heat from the exhaust combustion products will condense and choke the exhaust.   That is what I am watching for when the heater ramps down to idle running.   The shutdown sequence ramps up the heater and switches on the glow plug to de-coke the mesh and plug for next run.

Our local Morrisons has a gas oil pump (red diesel)
Ah yes i had not thought of that but it makes sense.
99
The Water Cooler / Re: Broken CNC milling machine
« Last post by AdeV on February 09, 2019, 11:32:27 AM »
I've gone though all the circuitry in the Beaver lathe and replaced every one of them, even if they look pristine.

I will probably do the same to the Bridgeport now... although before I do I'll get it back up and running.

Removed, after much unscrewing, the drive board, unsoldered the caps. The burnt one has taken its trace off the back of the PCB, but fortunately its very simple, so a straight wire bridge will replace it easily. The blackened resistor, remarkably, is still pin on 33.3 ohms! So I'll re-use that, after cleaning the soot off it.

Now I just need to wait for the caps to show up, and it can all go back together again  :thumbup:
100
Our Shop / Re: Shop heating
« Last post by awemawson on February 09, 2019, 09:24:24 AM »
Pop along with your can and I'll flog you some red diesel - I keep a bowser with 1000 litres of the stuff  :clap:
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