@RobinHood that would be nice if you could do that. Always helpful to hear what others experiences are.
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cutter grinder idea
- Thread starter garageguy
- Start date
I'm flattered to a be a power that be's....but just remember the difference between an expert and a lay person is a measly 5% more knowledge 
what do you need? imo, an air bearing and a diamond cup wheel. Getting the helix right is done by the tooth rest following the recess in the front of the cutting edge. Its a challenge imo to do so without the sensitivity an air bearing gives. If you do as I do and not worry about the ends, and you batch things, doing a large lot of them, it goes fairly quickly. Do wear a proper respirator (not just a paper filter) if doing any volume of carbide as grinding it releases cobalt dust which is not on the list of daily recommended vitamins and minerals
to save some typing, some rational cut and paste from the accusize grinder thread
- unless you are plunging, you're not cutting on the end. Indeed the end is relieved a degree or two toward the centre so it doesn't rub. Unless you are plunging, the wear maybe all toward the end, but its still on side of the endmill.
- I stopped bothering grinding the end. Its a PITA (even without worrying about the gash) and 95% or more of what I do is not plunging so when an end mill is worn, its the helical side that needs grinding not the end. grind the sides a go back to work
- yes you can sharpen the sides various ways, but it's a royal PITA without an air bearing...and is soooo easy with one.....one of the reasons the usefulness of these is a lot less imo than you might think if haven't ground end mills before.
what do you need? imo, an air bearing and a diamond cup wheel. Getting the helix right is done by the tooth rest following the recess in the front of the cutting edge. Its a challenge imo to do so without the sensitivity an air bearing gives. If you do as I do and not worry about the ends, and you batch things, doing a large lot of them, it goes fairly quickly. Do wear a proper respirator (not just a paper filter) if doing any volume of carbide as grinding it releases cobalt dust which is not on the list of daily recommended vitamins and minerals
to save some typing, some rational cut and paste from the accusize grinder thread
- unless you are plunging, you're not cutting on the end. Indeed the end is relieved a degree or two toward the centre so it doesn't rub. Unless you are plunging, the wear maybe all toward the end, but its still on side of the endmill.
- I stopped bothering grinding the end. Its a PITA (even without worrying about the gash) and 95% or more of what I do is not plunging so when an end mill is worn, its the helical side that needs grinding not the end. grind the sides a go back to work
- yes you can sharpen the sides various ways, but it's a royal PITA without an air bearing...and is soooo easy with one.....one of the reasons the usefulness of these is a lot less imo than you might think if haven't ground end mills before.
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Ok, so I have to find a used air bearing in decent condition, a diamond cup wheel, and hours of education and practice.
Tom O
Ultra Member
I’m in the Doverglen area if you wan to borrow this a collet would have to be made though.
Former Member
Guest
I guess I'll have to add an air bearing on my Deckel clone...., thats an easy one to do.
For me plunge cuts are what is important for one particular job and there are lots (as in 2000 on a run).
For me plunge cuts are what is important for one particular job and there are lots (as in 2000 on a run).
I think my “grinding session” has just moved up the priority list by a lot….
Thanks for the offer to borrow the air bearing @Tom O ! I will take you up on it in the near future.
a smile
Lifelong hobby - cold iron
It is the most critical to make a good design and quickly put it into the actual production. When you make the first improvement, you will find its defects, and the production will be gradually perfect after modifying the design. I used to do ---- first
Matt-Aburg
Ultra Member
This place in Windsor does endmills. Drills, I do myself.. maybe show me on my field trip....
a smile
Lifelong hobby - cold iron
- This is what I need. I'll make a copy and use it myself