Here is a list of all the postings David Jupp has made in our forums. Click on a thread name to jump to the thread.
|Thread: Hardening Stainless Steel|
Was not suggesting work hardening as a method to use (it explains why so many drills get broken in stainless) - just pointing out that 300 series steels will not harden by quenching.
If you want to harden stainless, it has to be from the correct family - if it is strongly magnetic you have a good chance it is. If weakly magnetic it's probably only workhardened austenic steel so will not quench harden.
I can't see some of the posts becuase they are obsucred by the advertising (this seems to happen irregularly on this site) so apologies if this is off beam...
There are different types of stainless (ferritic, austenic & martensitic)
300 series are probably most common - these are austenitic, they work harden like crazy - but do not quench & temper
martensitic, can be quenched and tempered - think surgical blades
ferritic - I don't have much information to hand at present !
So some stainless grades can be quench hardened, but many can only be work hardened. You can sometimes (but not totally reliably) identify austentic steels as being non-magnetic (work hardening can tip them into being magnetic...).
|Thread: Cool down a mini-mill motor.|
I'd suggest that the surface temperature probably isn't as high as that if you can hold your hand in place. Maybe with glassware you 'get away with it' because glass is not a fantastic conductor of heat, with metal object I certainly would not want to put my hand on anything very much above 50 C.
|Thread: Which Stainless Steel?|
All 300 series (1.4404 equivalent to 316L ) will work harden. 400 series have different microstructure, less prone to work hardening, but not as widely available (and could be hardened by heat treatment anyway)
Use tapping drills on the larger side, and use a tapping compound.
|Thread: Alibre 11.2|
Yes - see my post earlier.
Alibre used to allow licence transfer/sale, but no longer do so.
3D files are an Alibre extension to STEP (which will import as STEP in some other CAD).
2D drawings derived from 3D are proprietary format (same as many other CAD systems).
There is a free viewer availble for Alibre as mentioned earlier (but this has to be provided via an existing user - you can't just browse to it on Alibre's web site).
Have PM'd you a link.
In addition to the free 30 day trial of Alibre (Professional), any current Alibre user can provide a link which will let you register for a free Alibre viewer - this is the standard Alibre software with content creation capabilities disabled.
A while back Alibre used to allow transfer of licence onward from the original buyer - the EULA was altered and now sellng/transferring the licence is not permitted.
Want the latest issue of Model Engineer or Model Engineers' Workshop? Use our magazine locator links to find your nearest stockist!
You can contact us by phone, mail or email about the magazines including becoming a contributor, submitting reader's letters or making queries about articles. You can also get in touch about this website, advertising or other general issues.
Click THIS LINK for full contact details.
For subscription issues please see THIS LINK.