Thread: endmill sharpening

Originally Posted by eskimo

What do you use?

or are they like the rest of the household furniture & whitegoods...throw away?

Here's how I do it.

How to sharpen a HSS end mill using a cheap pencil air die grinder - YouTube

Rob

Nice job! When I first started watching the video I thought you were going to grind straight across (as some people do ... and then wonder why it doesn't cut properly!) but indeed all the angles look to be pretty good. Thanks for sharing.

I use a 4 jaw for simple indexing like that, and have a little bubble level I rest of the horizontal jaw to establish the index. The downside is the 4 jaw needs to be dialed in, but with two keys it only takes 30 seconds, often less.

Yes I have an endmill fastening fixture for my surface grinder. The issue is that by the time I put in a 5C to ER32 adapter and then the endmill itself, I runout of headroom. I have a full 5C collet set on the way from CDCO, as I now have a number of fixtures and machines that take 5C collets, that makes the 4th set of collets I own and use I expect that should solve the headroom issue and I'll let you know how it goes. I believe they work quite well however. It would be quite feasible to purchase just the collets as you needed them for each size.

Pete

thanks Rob

Pete, report back as soon as you try it out..ta

Usually it's the corners that dull. If you don't actually need a sharp cornered cut, you can replace the corner with a small 45* facet.

Originally Posted by Pete F

Nice job! When I first started watching the video I thought you were going to grind straight across (as some people do ... and then wonder why it doesn't cut properly!) but indeed all the angles look to be pretty good. Thanks for sharing.

I use a 4 jaw for simple indexing like that, and have a little bubble level I rest of the horizontal jaw to establish the index. The downside is the 4 jaw needs to be dialed in, but with two keys it only takes 30 seconds, often less.

Yes I have an endmill fastening fixture for my surface grinder. The issue is that by the time I put in a 5C to ER32 adapter and then the endmill itself, I runout of headroom. I have a full 5C collet set on the way from CDCO, as I now have a number of fixtures and machines that take 5C collets, that makes the 4th set of collets I own and use I expect that should solve the headroom issue and I'll let you know how it goes. I believe they work quite well however. It would be quite feasible to purchase just the collets as you needed them for each size.

Pete

Pete
did you ever get those collets from CDCO? and if so what was the outcome?

Yes I have the collets. I've only used a few sizes, but so far they're fine. I haven't used the fixture for the surface grinder however as I now have a dedicated end mill sharpener. However from the previous fiddling I did with it, I'd expect the fixture to work just fine albeit not as quickly as the Darex.

Pete

Originally Posted by Pete F

Yes I have the collets. I've only used a few sizes, but so far they're fine. I haven't used the fixture for the surface grinder however as I now have a dedicated end mill sharpener. However from the previous fiddling I did with it, I'd expect the fixture to work just fine albeit not as quickly as the Darex.

Pete

thanks Pete

This is how I sharpen end mills Eskimo,

Phil
Grinder attachments (8).JPG IMG_2781.jpg Endmill grinding jig (4).jpg

Originally Posted by Steamwhisperer

This is how I sharpen end mills Eskimo,

Phil
Grinder attachments (8).JPG IMG_2781.jpg Endmill grinding jig (4).jpg

Can't beat Harolds designs! Still on my rondtoit list.....

Originally Posted by Ueee

Can't beat Harolds designs! Still on my rondtoit list.....

It's worth doing Ewan.
Soooo easy to use

Phil

Originally Posted by Steamwhisperer

This is how I sharpen end mills Eskimo,

Phil

ta Phil...I'll do a search on gooogle for plan...mmm might even have it in my ebooks

Its in Harold halls sharpening book, this one: Tool AND Cutter Sharpening BY Harold Hall Paperback 2006 1854862413 | eBay
Actually i just looked in my copy and its not the same as Phils jig.....But there is a lot of good sharpening stuff in the book, including jigs for split point drill sharpening (hehe), all sorts of cutter sharpening, small drill bit sharpening etc.

Cheers,
Ew

Is there an easy method of sharpening the outside flutes ?

I have a weird looking accessory for my T&C grinder and I think it is used for just this purpose . It will twist the tool as it is fed into the grinder ?

How is this done, normally ?

Mike

Originally Posted by morrisman

How is this done, normally ?

Sounds like it. Got a picture?
Doesnt have an air fitting on it does it?

Stuart