Post by ettingtonliam on Jun 7, 2020 12:14:51 GMT
I've been making Locomotion's crank pins from a length of 5/8" dia silver steel, of unknown origin. Its been in my material store for a while and I can't remember where it came from.
Initial turning down to size was horrible, even using my trusty brazed carbide tip tool that I use for 90% of my turning. The swarf just came off as rough flakes. Then suddenly, about 30 thou in, it changed, and the swarf came off sweetly in nice spirals. I've had this effect before, just at the ends of silver steel bars, because the cutting off disc had overheated the end, and rapid cooling had caused a chill effect.
Then, to make some smaller pins, I used a length of 3/8" silver steel, which still had the magic word 'Stubbs' stamped on the end. This was no problem at all, just turned nicely right away.
Has anyone else come across this skin effect with 'cheap' silver steel?
Initial turning down to size was horrible, even using my trusty brazed carbide tip tool that I use for 90% of my turning. The swarf just came off as rough flakes. Then suddenly, about 30 thou in, it changed, and the swarf came off sweetly in nice spirals. I've had this effect before, just at the ends of silver steel bars, because the cutting off disc had overheated the end, and rapid cooling had caused a chill effect.
Then, to make some smaller pins, I used a length of 3/8" silver steel, which still had the magic word 'Stubbs' stamped on the end. This was no problem at all, just turned nicely right away.
Has anyone else come across this skin effect with 'cheap' silver steel?
