Lath not cutting
|1507 forum posts|
Certainly fits the description Jason - mine are dark silvery grey as described above. They were purchased on eBay and I've always assumed that they were a by-product of some other commercial manufacturing process - and that either the company itself has found an additional revenue source, or some enterprising soul has discovered extra income by raiding the company's scrap bin...
4410 forum posts
Sure you would. Or you could even use a four jaw if needed. But it sounds like you are proposing to hold the blanks by the OD while you machine the OD, so could be kind of flimsy holding power.
You might be far better off to either mount the wheel on an arbor/mandrel or bolt it to a faceplate. You can drill and tap threaded holes part way through the wheel if you don't want the holes visible on the finished wheel outer. Or make a stub mandrel out of a piece of say 1.5" or 1" bar with a bolt hole in the centre. Bolt the wheel on and hold in position with Loctite or superglue while machining to stop rotation. A blast with the propane torch afterwards will break it loose. Or even a rap from a hammer often does it.
What RPM did you try machining at? For 2" diameter you would need to be down around 100rpm for HSS and maybe 200 or 300 for carbide inserts. Hard if you have one of those small lathes with variable speed motor with no torque at low rpm so your best shot then would be grind off the scale and carry on as above. Use backgear if you have an old banger from that primitive era.
i machine laser cut discs all the time without problem. Our local steel merchant sells the "holes" he cuts out of structural steel work. Very handy and usually machines quite nicely. The hard layer is only a few thou thick so takes not much at all to grind or machine it off.
|vintage engineer||24/05/2020 10:31:46|
248 forum posts
Depending on whether it was made from new mild steel or it was recycled mild steel will affect it's composition. Recycled mild steel can contain all sorts of unwanted crap including boron.
The only mild steel that I know that is made from raw iron ore is structural steel as this has to have a certificate of conformity. Where as run of the mill mild steel doesn't.
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