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It has nothing to do with the probe itself. All of them are repeatable enough. The measurement tool are the axes of the machine itself, and this where the process control should be aimed.
Today newer Renishaw tricked out (3d strain) probes and other seem to be creeping in on "In process" gauging so at least (theoretically) you can have a smaller "Band" of parts within tough/difficult form tolerances. I know there are older made in Switzerland sensors and gizmos for in-process gauging that have been used for many years on round parts.
It is all about repeatability. For hardturning on a lathe inprocess gauging does not really work. It isn't ocilating back and forth like a cylindrical grinder taking small amounts of material per pass.
It has nothing to do with the probe itself. All of them are repeatable enough. The measurement tool are the axes of the machine itself, and this where the process control should be aimed.
<snip> My requirement is to maintain 0.002 mm dimensional accuracy in hart turning process.
The repeatability of both types (standard and so called Rengage) depends on the ability of the deflected stylus to return exact to it's initial position. In both types of probes it is done by mechanical system (invented in 19th century by Sir James Maxwell), called kinematic stage. The difference is that Rengage is generating the trigger signal using strength gage, while standard probes - using electrical normally closed contact. Renishaw claims, that Rengage assures the repeatability of 0.5 microns, comparing to 1 micron of standard probes. Assuming that this is true, this 0.5 micron "drawback", according to my personal experience, is negligible in metal cutting machining world. But Rengage are priced much higher than standard probes, so why shouldn't the producer try to convince us, that using it will let us get better results ? BS.Indeed !
But increasingly I'm seeing higher "Accuracy" "precision" and "repeatability" probes being specc's as standard with various machines.
For example Rengauge / RENGAGE™ like OMP 600
OMP600 high-accuracy machine probe
RENGAGE™ technology
View attachment 322595 <--- Click to blow-up.
Do you guys not realize that the two micron tolerance is only the "Indian" tolerance. The actual tolerance is probably +/- 10 microns but tell the Indians that,they'll end up making parts that are +/- 30 microns, and call it best quality. With a 2 micron tolerance, there's a "possibly" good chance that the finished parts will be within the actual size needed.
Thanks for your suggestions. We are doing this kind of components in a Miyano lathe with lenear tool post plus minus 0.002 microns tolerence about 1200 Nos per day. Component weight is only 4 gms. This process we canot do on grinding machines. No coolant must be used. Only special carbide tools should be used which can machine components up to 62 HRC. If coolant is used tool will break. 6 bar air can be used for cooling the edge of tool with builtin airlines supply through the tool holders.Do not index your turret.
Do not use any rapids.
Do not make any unnecessary moves. Do not home the x axis after part is done.
Use flood coolant.
Make sure the final pass on the od is consistent.
Make sure shop is climate controlled.
Keep rpms on the low side.
maybe, big maybe you can hold .002mm.
Thanks for your suggestions. We are doing this kind of components in a Miyano lathe with lenear tool post plus minus 0.002 microns tolerence about 1200 Nos per day. Component weight is only 4 gms. This process we canot do on grinding machines. No coolant must be used. Only special carbide tools should be used which can machine components up to 62 HRC. If coolant is used tool will break. 6 bar air can be used for cooling the edge of tool with builtin airlines supply through the tool holders.
Sukumaran.
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