JD450A
Feral as Fk 🐾
nah ..... anything's bustable if you're trying enthusiastically enough ... should see some of the horror stories on Maskinisten
V8Druid
do it as well as you can,but learn to do it better
oh and in Devon toonah ..... anything's bustable if you're trying enthusiastically enough ... should see some of the horror stories on Maskinisten
Engcon UK
The Noble Art of Digging
Robert ... are these really cast Iron or malleable ..... or even cast steel
Ductile cast Iron, Graham. GJS - 500 - 7, I believe
V8Druid
do it as well as you can,but learn to do it better
Ductile cast Iron, Graham. GJS - 500 - 7, I believe
"EN-GJS-500-7 is an SG iron grade containing graphite nodules or spheres, Spheroidal Graphite. The rounded graphite nodules produces a more ductile cast iron that inhibits the formation of cracks. SG iron such as EN-GJS-500-7 has a greater fatigue and impact resistance compared to grey iron. The final number in the SG iron grade refers to the percentage elongation. " and there you have it
Engcon UK
The Noble Art of Digging
FWIW, a million years ago, my first job was as a metallurgist in the Process Research Department at British Steel in Scunthorpe. I've forgotten all of this
K
Komatsu
Well-known member
So in layman’s terms, what the difference between the different types, and there uses?
Engcon UK
The Noble Art of Digging
I'm sure that a wikisearch will give a better answer than I can, but cast iron is generally more brittle but less likely to deform than steel, which is an alloy. Adding compounds and elements such as graphite means that the layers of iron within the casting can slide over each other when coming under a shear force and are therefore less likely to catastrophically break. IIRC, spheroidal graphite also stops crack propagation in the same way that a rounded corner in a steel joint does.
Health warning - I'm probably talking B*******KS as I stopped doing this over 30 years ago.
V8Druid
do it as well as you can,but learn to do it better
how long have you got Ollie
.... basically what Robert said ... the spherical nature of the graphite allows movement to a degree instead of the crystaline natue of conventional cast which inter-knits and tears under excessive loading causing cracking and fracturing ... makes it more malleable and able to take stress (and shock) loading better.as Robert says, I dare say a wiki search would provide a clear explanation, but pull up a chair and make yerself a cuppa ...
K
Komatsu
Well-known member
Thanks
V8Druid
do it as well as you can,but learn to do it better
so .... went back and had another look at his rotator vid and in the comments below he's put up a link to the source of his rotatorI like this bloke
watched one of his vids on his rotator ... he's glowing about his $200US Chinese rotator unit ... would love to know where he found one for 200 US bucks
Velly interlesting
..... but only to Alibaba ... not the specific supplier / unit ... going to see if he'll share specifics .... for 200 bucks, US, I'd have one on the way .... most others I've seen / found are closer to a grand ... seems that there is now a huge market for these rotators in the solar tracking field, for PV arrays, so prices are gonna fall for sure, as it gets 'competitive' the ring gear i used on the MkI VA-r has certainly taken some grief with no visible ill effects ... and so it should .... 'tis a hell of a bearing
Bri963
Well-known member
Cat and John Deere (for definite, no doubt others are using it now) use SGI for their cranks. Cheaper and faster to machine than forged steel.
V8Druid
do it as well as you can,but learn to do it better
If my memory serves me correctly, when the gov. of the day mooted closing Brymbo in N Wales, Caterpillar begged them not to do it
... all their crankshafts were made of Brymbo steel and they revered it as the finest available. ... obviously it fell on deaf ear and I understand CAT placed an order for their entire production for 3 months prior to closure .... they had no idea what they were going to do when they'd exhausted their stock.Apparently the quality was attributed to the water in the area
D
Davedb
Well-known member
I’d of gotten the whole thing hot myself not just specific areas but time will tell if it holds
V8Druid
do it as well as you can,but learn to do it better
Hmmmmmm !
K
Komatsu
Well-known member
Great to watch, saying that it’s Cast Steel rather than Ductile cast iron??
CPS
Well-known member
That guy us not so slow as they say around here
he got it welded.... and il bet it holds up ok
I've took less time and welded things and they lasted
he got it welded.... and il bet it holds up ok I've took less time and welded things and they lasted
V8Druid
do it as well as you can,but learn to do it better
not according to Robert ?
..... have to say, looking at the damaged bits, it was my first thought TBH didn't take the MIG too well though and cast steel welds nice with a MIG usually 
Left hooker
Well-known member
Too much start stop for my liking to many cold welds where they startHmmmmmm !
jd6820
Well-known member
As soon as I saw wire size and lack of pre-heat first time round, I thought this hasn't got a chance of welding hot. Then he announced the use of a 160A MIG, no chance without root gaps and lots of passes. Which it looks like he did second time round... Heat process looked a little hit and miss?
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