Member postings for john routley

hi,

the diameter is 45mm 1 3/4" its supposed to be T6 grade

just machined a previous sample (machined outside) finish is completely different and quality is excellent,

so i'm now drawn to the material as being the issue

thanks for all your help.

thought I was going mad

hi guys,

I've contacted the material supplier, weve brought about 20m if it.

We have tried machining from 500rpm to 2500 rpm using css and also fixed spindle speeds

dia turning has been done at 0.25mm/rev with a 0.06 dia finishing cut at 0.05 feed

All the tools are 25x25 shank WNT tools ali tips and using CCGT120404 inserts

the "o" ring tool is a 2mm wide grooving insert firmly gripped in a grooving holder

the radius grooves (5mm) are machined with a 3mm rad tip. roughed out and then finished with a profile program

we have brought aluminium specific polished tips for all the tools

we flood the material with coolant while cutting

parting is terrible, material goes snotty very easily,

ill bring up all the specs tomorrow

Hello baz your very right its a bit shocking, i brought this large lathe and a 4 axis mill, + and load of other machines at the same time, for the most part im very happy but this finish on the lathe is way off what i would expect....is it machinist or machine is the thing or just the tooling.
my guy has been machining for 30- years but not this material.

hello Neil, we are using suds rather than oil, for the general parts we make out of derin oil is not needed but we are really struggling with this ali, i know part of the issue was machine alignment but i think its now something we are doing wrong

thank you for the reply's guys, i cant get hold of my machinist today
the ali is 6082 and we always use coolant,

i cant get the rest of the info you need until tomorrow, but i'll get a full list of tip feed speeds etc
its a brand new cnc, but it did come with issues we have had to address, its far better than it was but we are still getting a finish thats no good for what we need the items for.

kind regards john

hello all, im looking for some help,

i just got a cnc lathe, but having trouble with turning aluminium, we did have some troubles with the machine and had to have a company come out and regrind the bed because there was some problems with it, but still cant get the ali looking any good
anyone know what is going wrong?