Motorsports-X
Hot Rolled
- Joined
- Nov 22, 2014
- Location
- Texas
any of you guys know what they make edm rulers and such from? I figure a 4 series stainless since they are magnetic, but not 100% sure. I have a bunch of 440c on hand.
Follow along with the video below to see how to install our site as a web app on your home screen.
Note: This feature may not be available in some browsers.
Hi All:
Years ago I built a very fancy tiltable EDM vise from Stavax Supreme and I have to say I'm a bit disappointed.
I got it back from the heat treaters at 53 RC which is about as hard as Stavax will go.
In my opinion it's still too soft for a vise.
It's about 8 years old now and has seen pretty heavy use.
It's picked up lots of little dings over the years that have had to be stoned out even though I've always treated it carefully.
I also have a matched pair of grinding vises I built from A2 about 40 years ago.
They are 62RC.
Aside from the scarf marks some asshole (me) put into one of them once upon a time, they are still pristine.
Both handle the same kind of precision ground hardened blocks under very similar clamping conditions, and the difference in condition is noticeable.
So for my money, harder is better, and the obvious choice is 440 C stainless because it will go up to 60RC.
Those seven Rockwell points make a big difference...more would be even better.
Like Zahnrad Kopf, I've also made stuff from D2, and it works nicely as well, but two things are not to my taste with it.
First is it's such a bitch to grind, especially to grind accurately.
Second is it's not as corrosion resistant as 440 C.
But it will get harder and for a precision permanent tool, I believe that's important to consider.
Cheers
Marcus
Implant Mechanix • Design & Innovation > HOME
www.vancouverwireedm.com
I know this is an old thread, or oldish anyway. I was curious about the System 3R tooling so am glad I came across the thread. I use S3R on the wire edm we have and I have to say, after maybe 2 decades use, it has no corrosion. I get the usual wire residue, easily removed, but no rust. If the 17-4 is anywhere close to that it would work fine for what I want of it. I'm designing something for work where I want some hardening but not too much, as I want to wire in a collapsible section that will only move under heavy load. No load and the section stays in its original state. I was looking at the collapsible jaws on the S3R vices and they work fantastically well.17-4 is what we like to use. It cuts nice hardened, its magnetic for easy grinding, and holds up well. Even at H900(40-46 Rc), it is still pretty good to work with if it needs a modification down the road. 17-4 has similar corrosion resistance to 420. Since our fixtures aren't on the machine any longer than a couple of weeks at a time, and are cleaned up after, corrosion hasn't been much of an issue.
Interesting, I had to look up your Thermo gun, never heard of it. Do the figures stack up against the metal System 3R use, it's Stavax isn't it?I finally got around to shooting an Erowa wire edm vise with the Thermo Scientific XRF gun.
The image marked "1" is the "quick mode" which does a best fit with a list of about 300+ alloys that are in the gun's internal database. Images 2 and 3 are a detailed breakdown of all the alloys the gun can make out after a considerably longer "shot".
fwiw...
PM
View attachment 293778
View attachment 293779
View attachment 293780
Notice
This website or its third-party tools process personal data (e.g. browsing data or IP addresses) and use cookies or other identifiers, which are necessary for its functioning and required to achieve the purposes illustrated in the cookie policy. To learn more, please refer to the cookie policy. In case of sale of your personal information, you may opt out by sending us an email via our Contact Us page. To find out more about the categories of personal information collected and the purposes for which such information will be used, please refer to our privacy policy. You accept the use of cookies or other identifiers by closing or dismissing this notice, by scrolling this page, by clicking a link or button or by continuing to browse otherwise.