Member postings for JS

Forgot to add: I enjoyed my time on the lathe all the same!

I did a bit of experimental turning today using 8mm shanks with tungsten carbide tips and then with indexibles with CCMT06. Naturally for a small peatol such as mine, progress was slow, however, turning the D2 it did. Not very deep cuts, mind you. It did need a fair bit of cutting fluid. Both types of tools successfully removed long curly strips of D2 with each turn. Every so often the chuch would stick but that was mainly due to me trying to cut too deep, too quick. Nice steady slow rotations seemed to work the best. In all I managed to cut a good 2mm off, going from the original 20.4mm down to 18.04mm. Thats if I've read my calipers correctly.

Down side is the cutting blades are already nearing bluntness after half an hour!

Wish I had a bigger lathe.

JS

^^^ Yep, thats a fair point

Hmm, my previous reply doesn't seemed to have uploaded. Damn internet dongle.

LAD: Thanks for the advice ref ccmt inserts. Will be looking for a turning tool and parting tool rather than buying a full set. Just need to decide whether I need a right hand or left hand.

Clive: Thanks for the tip ref metals behavour when turning. I'll make sure I've got my goggles on.

Forgot to add, it's just a wee peatol I have, so slow and steady will be the rule of the day. Haven't quite got to the point where I can buy a myford but hope to one day.

Edited By JS on 15/01/2013 01:53:37

Can anyone put that into laymans terms?

All I need to do now is figure out what this means:

Turning Turning
with carbide with high
Cutting data speed steel
parameters Rough turning Fine turning Fine turning

Cutting
speed (vc)
f.p.m. 230–360 360–500 50
m/min. 70–110 110–150 15

Feed (f)
i.p.r. 0.012–0.023 –0.012 –0.012
mm/r 0.3–0.6 –0.3 –0.3

Depth
of cut (ap)
inch 0.08–0.20 –0.08 –0.08
mm 2–6 –2 –2

Carbide
designation
US C2 C2 –
ISO K15* K15* –

* Use a wear resistant Al2O3 coated carbide grade, for
example Sandvik Coromant GC 4015 or Seco TP100.

Thanks for the reply. I think I've already downloaded that from somewhere else as I recognise the front page, but I don't remember seeing the Machining section on page 6.

Hi All.

I've been given some small off cuts of D2 steel rods about 22mm diameter and would like to know what would be the best type of tool to turn them down to a lesser diameter, about 19mm-20mm, on my hobby lathe. Thankfully the D2 off cuts have not been hardened or treated and are still in it's normal state. Should I use HSS, indexible tips or carbide brazed tools? I was thinking of buying some 8mm shank tools from RDG but would appreciate feedback from here on what my best option would be.

Thanks,

JS