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29th October 2014, 06:54 AM #46Philomath in training
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- Oct 2011
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- Adelaide
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Thanks for those photos. Can you post a picture so we can see what the finished grind looks like?
Michael
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29th October 2014, 08:13 AM #47
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31st October 2014, 06:41 AM #48Intermediate Member
- Join Date
- Apr 2013
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- San Diego
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- 31
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
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3rd April 2015, 06:04 PM #49Philomath in training
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- Oct 2011
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- Adelaide
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- 59
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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
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3rd April 2015, 06:50 PM #50Pink 10EE owner
- Join Date
- Aug 2008
- Location
- near Rockhampton
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- 4,298
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)
Light red, the colour of choice for the discerning man.
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3rd April 2015, 11:08 PM #51GOLD MEMBER
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- May 2011
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- Murray Bridge SA
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- 2,956
Does this mean Michael is now in the business of sharpening milling cutters??????
Kryn
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6th April 2015, 04:13 PM #52Philomath in training
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- Oct 2011
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- Adelaide
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- 59
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6th April 2015, 04:24 PM #53GOLD MEMBER
- Join Date
- May 2011
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- Murray Bridge SA
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- 2,956