Thread: Using a surface grinder but not for surfaces

Originally Posted by Michael G

These ones?
http://www.ctctools.biz/servlet/the-...ECISION/Detail

Michael

Yes, those ones.

Dean

Magnetic parallels can be made like this. They don't hold quite as well as the laminated kind but will do the job in most cases and are simple to make. Drill/ream the holes and press fit ordinary dowel pins. You'll have to do a better job of nesting the holes. I did it rather quickly. You can even make a V block this way.

Gene

Back in post 1 I asked about grinding fixtures for the SG.
I eventually bought one of the ones I pictured and while playing with it today thought that it may be of interest to others.
Possibly the biggest problem I had was cutter length - fitting it under the grinder with the limited height I had was tricky but I managed it.
The cutter that I used was one that I'd done an RC on some time back. Totally stuffed, and as it was a new 5/8" cutter 5 minutes before being crunched I was not happy. The first step was to cut it back to full flutes with the angle grinder
P1020890 (Medium).JPG P1020891 (Medium).JPG

Then it was a matter of setting it in the fixture. The collet chuck has 12 angular stops, so cutters with 2, 3 and 4 flutes can be sharpened.
The sequence seems to be to gash the end of the cutter with an angle grinder then grind the secondary relief as shown in the photo, leaving the primaries until last
P1020896 (Medium).JPG

I kept waiting for the fixture to go flying but it did not.
Here I've blued the secondary relief before grinding the primaries. As you can see, the facets are nice and even. They are also sharp - unlike the picture. The numerals on the collet are in focus, so why isn't the cutter in the photo?? Damn autofocus!.
P1020898 (Medium).JPG
Here's a finished part shot with the original tip that was cut off. Passes were 3 thou feed. I still haven't got the coolant sorted on the SG so probably need to get that going as I was getting the slightest hint of colour at the very tip of the edge. (Understandable - nowhere for the heat to go)
P1020899 (Medium).JPG

Still, it's salvaged a wrecked cutter so it can now be used to machine again and I have several cutters that could do with a touch up on the ends so worth considering I think
Michael

Originally Posted by Michael G

The cutter that I used was one that I'd done an RC on some time back.

LOL

Here's a finished part shot with the original tip that was cut off. Passes were 3 thou feed. I still haven't got the coolant sorted on the SG so probably need to get that going as I was getting the slightest hint of colour at the very tip of the edge. (Understandable - nowhere for the heat to go)

See you need a CBN wheel like I got...

Does this mean Michael is now in the business of sharpening milling cutters??????
Kryn

Originally Posted by KBs PensNmore

Does this mean Michael is now in the business of sharpening milling cutters?

Let's see - how can I put this delicately so I don't upset anyone?

No

Used the resharpened one today. Cuts beautifully.

Michael

Originally Posted by Michael G

Let's see - how can I put this delicately so I don't upset anyone?

No

Used the resharpened one today. Cuts beautifully.

Michael

I guessed as much, I was only teasin anyway.