How Do I Machine Hardened Steel on the Lathe?

Gallery, Projects and General > How do I??

<< < (3/5) > >>

Manxmodder:
Snub, interrupted cut is the terminology used when the tip of the turning tool is not cutting in contact with a full 360 degree component face due to cut outs or splines or keyways as in your earlier photo.

By contrast a continuous cut is when you are cutting a component without any keyways,cutouts or holes on the face being machined hence a continuous contact between tip and component.

For your application I would select a tip designed for interrupted cutting.....OZ.

.....OZ.

Manxmodder:
Snub, here is a link to a short youtube video showing hardened steel being cut with a ceramic tipped insert.

The effect with a cubic boron nitride insert is very much the same as seen in this video.

Link:

.....OZ.

snub:
Thanks for the video. I actually have already seen that one in my quest for knowledge.

Judging by some of the posts it almost sounds like I would have to re-harden the gear after cutting it. I don't think that's an option.

I thought the process for machining was as follows:

Machine the soft steal, then harden it, then use a grinder to bring it back to the proper dimensions that changed when hardening it. Seems to me that if I could get someone to grind off the .025", that I would be good to go. I could be wrong.

patuca mentioned a tool post grinder, but I don't know much about the. Please enlighten me!

75Plus:
The reason the sprocket is hardened is to prevent premature tooth wear. The area that you are working in really does not need to be hard. It is hardened along with the teeth in the hardening process. Once you get the thickness where you need it you should be good to go. Sprockets routinely have only the teeth flame hardened so the hub will still be soft enough to bore and broach the keyways.

Joe

vtsteam:
75Plus has the key to it, and you may find that using a makeshift toolpost grinder like this:

http://madmodder.net/index.php/topic,9890

mght get you through the skin to soft metal. Generally a toolpost grinder isn't a handheld grinder -- but a precision purpose built tool that attaches to the toolpost -- however John's version is really cool and seems to work for some purposes -- maybe yours...

(btw not all the photos in that thread are loading tonight -- seems to be a Flickr problem -- try it again later if the text doesn't refer to something you can see in the thread.)

Navigation

 Message Index

Go to full version