I use the iTNC in conversational mode, but my probing manual shows commands such as G410 for ISO. Check out this link...
http://content.heidenhain.de/doku/tnc_guide/pdf_files/iTNC530/340422-xx/tchprobe/375_319-22.pdf
We have had success at 2 microinch Ra with white light interferometers (have not tried a lower Ra than that). Veeco and Zygo are two companies that serve this application.
I agree that many would call this axial runout, but "Axial Runout" is not defined in the standard either.
"Circular Runout" specified with a drawing pointing to the desired surface is the most complete definition.
Both "Perpendcularity" and "Total Runout" can be used to specify control of the geometry you describe per ASME Y14.5M-1994 (see sections 6.6.4 and 6.7). Therefore both can be correct. The best resolution is to have it specified clearly on a drawing and linked to a national standard definition...
Current Wire EDM technology can achieve finishes < 6 microinch Ra. Have you investigated improving the wire EDM process? Extrude Hone will improve the finish but may compromise your geometry.
Maui, we used nitrogen blanket furnaces rather than vacuum.
The process applied to the sample was:
Preheat @ 1000F
High Heat @ 1950F
Forced Air Quench
Cold Treatment to -100F
Temper @ 475F for 2 hours
Citric Acid Passivation.
Thanks EdStainless! That is exactly what I was hoping someone could explain to me.
Maui,
The samples were prepared identically with milling and turning prior to heat treat. The only difference would be that the ones coming through heat treat would have been sandblasted after heat treat. The...
Recently during a comparison test of various martensitic stainless steels I included a soft sample with my hardened specimens. By soft I mean as delivered from the metal supplier (presumably annealed; for 440C, the hardness measured a 20 on the Rockwell C scaled compared to 60 for the heat...
This is a very large subject. See ISO standard 230 sections 1-11 which is over 1" thick when printed.
You have to customize it to your needs. I start with my environment "How big a doorway must it fit through?" What weight can your floor with stand?
Then decide if you want to evaluate...
Thanks for the input! The applications are tooling for forming and stamping equipment. The additional wear resistance from cold treatment is desired, but I'm not sure the gain was ever quantified when this practice was put in place years ago. Literature appears to suggest that better wear...
I'm reviewing some heat treat specifications for our company. I would prefer to specify results (i.e. hardness)rather than process (i.e. heat to 2100°F ...). However, we curently require cold treatment of CPM10V to -105 F.
Should I write the specifcation to state "62-64 Rockwell C hardness...
Regarding finish, our typical surface grinding yields a 6 microinch Ra. This will vary with wheel grit, machine quality, process, etc. To achieve that finish in WEDM, you will have to buy a machine less than 5 years old. However, since your stamping, surface finish of profiles may not...
I agree with ornerynorsk, you probably need a Wire EDM. We do the type of cuts you are describing on a Charmilles 2030. On the used market my guess is they run around $75,000, but they may be more accurate than you need. Keep an eye out for additional costs when you buy, such as filters...
