I have problem with easy (in terms of tolerances) steel screw with thread, so look specs from Star KNC-20 swiss on which I am trying to make it (problem is thread) to look is there any hint
and found out:
max. dia. for cutting M10x1.5, max. dia. for thread tapping M10x1.5? I mean you would expect lathe which can do 20mm dia. can cut M14 in steel? Of course slow and with lot of passes?
but in spec they say M10x1.5 and it is same as tapping?!?
Thread which I am doing is M14x1.5 and it is 7.5mm long.
I use G92 cycle because it works perfect on brass screws we made. It is quite similar screw so program isn't problem.
Older collages (sadly we don't have cnc lathe guys) are convince spec isn't true because you on manual lathe you can do any thread you want, just slow speed and many passes.
I tried different speeds (100-500) and many passes (reducing depth of cut as going deeper and do clearing pass in end) but thread looks awful no matter I do, it is more like ploughing then cutting, as machine simple don't have power to cut thread, which is strange to me based on what manual lathe folks say.
Btw tried HSS and Carbide tools. Similar thread.
Steel is probable some junk but it isn't some super hard stuff so I doubt it is problem? Or could it be?
and found out:
max. dia. for cutting M10x1.5, max. dia. for thread tapping M10x1.5? I mean you would expect lathe which can do 20mm dia. can cut M14 in steel? Of course slow and with lot of passes?
but in spec they say M10x1.5 and it is same as tapping?!?
Thread which I am doing is M14x1.5 and it is 7.5mm long.
I use G92 cycle because it works perfect on brass screws we made. It is quite similar screw so program isn't problem.
Older collages (sadly we don't have cnc lathe guys) are convince spec isn't true because you on manual lathe you can do any thread you want, just slow speed and many passes.
I tried different speeds (100-500) and many passes (reducing depth of cut as going deeper and do clearing pass in end) but thread looks awful no matter I do, it is more like ploughing then cutting, as machine simple don't have power to cut thread, which is strange to me based on what manual lathe folks say.
Btw tried HSS and Carbide tools. Similar thread.
Steel is probable some junk but it isn't some super hard stuff so I doubt it is problem? Or could it be?