EMG-12 Endmill Re-sharpening module

[KWILParticipant @kwil]

Could an EMG-12 user post some large size photos of the end results please? The MEW pics were a bit twee.

Edited By KWIL on 26/05/2015 09:56:41

[John Stevenson 1Participant @johnstevenson1]

Bandersnatch,

Yes it can do a 1/2" cutter but you will need to make your own holder for it.

Basically it's juts a piece of 20mm steel with a 1/2" hole in it, couple of M5 grub screws and the length has to be the same as the 12mm one it's mimicking. The original metric holders cannot be modified as they are hardened, as it all the rest of the fixturing parts.

Same applies to any special cutter.

Ken will do a bit later, the original in the article were not great as they were done under a USB microscope type camera. Might be a few hours though.

[doubletopParticipant @doubletop]

Posted by Ketan Swali on 25/05/2015 14:03:00:

Hi Pete,

……..So you see, we too go through mental anguish, gymnastics, and due diligence through the product consideration process. As advised earlier, we are going through the same process for larger sizes, but only time will tell what will be the result

Ketan at ARC.

Ketan

I get it and understand the process you have had to go through to get these items available in the UK.

I've purchased items for this hobby direct from Hong Kong, China, USA and the UK, including ARC and John M. Larger equipment has come from NZ suppliers as shipping of one off heavy items is prohibitive. But smaller items just about always from off shore as they tend to be better value (same or better stuff but cheaper). As a result I always check all my options. It started when I was looking for a supplier of a particular item from Vertex. The best price I could get, including shipping and duty, was from the UK. Crazy when it meant it just about doing a world tour to get to me. So I now check all options before making any purchasing decision.

So never say never, I could eventually purchase one of these from you.

regards

Pete

[Ketan SwaliParticipant @ketanswali79440]

No problem Pete, I totally understand,

What is the maximum weight limit before a product is classed as 'a one off heavy itme' under the NZ import prohibition list.?

Ketan at ARC

[John Stevenson 1Participant @johnstevenson1]

Ken,

Best I can do with the camera I have, or more like the skills.

Done a 2, 3 and 4 flute.

[KWILParticipant @kwil]

John,

Thank you for these pics, much better clarity as to what can be achieved. Iguess others will be able to make their own assessment with this help.

Cheers

K

[Owain SamuelParticipant @owainsamuel55325]

Firstly, the beast following it's arrival and placing on the clearer of the two benches. The cutters sat alongside were all sharpened in the space of less than 30 min once I'd got my head around working the beasty

[Owain SamuelParticipant @owainsamuel55325]

A closeup of a 2 and a 4 flute 10mm cutters, both fresh from sharpening, time about 3min each.

[Owain SamuelParticipant @owainsamuel55325]

The cutter before sharpening. Spot the rounded corners.

And the very same 12mm cutter after sharpening. Again, time taken 3min or less.

[Douglas JohnstonParticipant @douglasjohnston98463]

Is it just me or does the grinding look a bit rough. The picture on the right shows the cutting edge with quite a serated look.

Doug

[Owain SamuelParticipant @owainsamuel55325]

And finally, a 3 flute carbide cutter that was (to put it politely) knackered. I ended up removing 1/8" off the end with a bench grinder before sharpening. The cutter had been in a CNC when the job moved, badly chipping all three teeth.

[Neil WyattModerator @neilwyatt]

I think it's an artefact created by the pattern left on the ground face, to get a true idea and avoid exaggerating the grinding pattern you need to avoid reflected light.

Here's a 1/2" 4-flute John ground for me when i first saw the beast – edges look dead sharp to me. It took about a minute, but he's had more practice

Neil

[Anonymous]

I didn't like to say so, but I agree to some extent with Douglas; the finish looks like it has striations? Whether these would have an effect on the surface finish is another matter.

Andrew

[Douglas JohnstonParticipant @douglasjohnston98463]

The magnification of the image probably makes it look rougher than it really is. It would be interesting to know what the specification of the grinding stone /diamond is and whether there is a choice of grit size.

Doug

[Enough!Participant @enough]

Huh? Are we reading the same thread?

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Bogstandard2 on 27/05/2015 21:40:37:

… Your insights into this great little machine are not needed here.

… Unwarranted insult remioved by Moderator.

.

 

http://www.oxforddictionaries.com/definition/english/forum

A meeting or medium where ideas and views on a particular issue can be exchanged.

Edited By JasonB on 28/05/2015 13:02:04

[John Stevenson 1Participant @johnstevenson1]

Posted by Michael Gilligan on 27/05/2015 22:24:18:

http://www.oxforddictionaries.com/definition/english/forum

A meeting or medium where ideas and views on a particular issue can be exchanged.

Unless you are exchanging coin of the realm then you can't have a view

No seriously there will always be the people that do buy and the people who want something for nothing.

At the start of Neville Shutes very good book Trustee from the toolroom is the following inscription.

"

An engineer is a man who can do for five bob what any bloody fool can do for a quid.
Definition: origin unknown"

This, seeing as the book is about Model Engineers should read.

"

An engineer is a man who can do for five bob what any bloody fool can do for a quid, and a Model engineer with a coke tin "

As regards the striations brought up by various people it is of no consequence to the finish as milling cutters are not ground flat across the face but a very shallow inverted vee with the outside corner being the lowest so in effect although the whole of the cutter is removing material the corner is doing the finishing just like a fly cutter.

NEXT

[Enough!Participant @enough]

If you're looking up definitions, there is also this:

**LINK**

In this case, it seems so blatant that I can only assume it's some kind of "in" joke on Bogs' part that I'm missing or possibly he was on the sauce.

[ANDY CAWLEYParticipant @andycawley24921]

Posted by John Stevenson on 27/05/2015 22:43:22

As regards the striations brought up by various people it is of no consequence to the finish as milling cutters are not ground flat across the face but a very shallow inverted vee with the outside corner being the lowest so in effect although the whole of the cutter is removing material the corner is doing the finishing just like a fly cutter.

NEXT

Which explains why what looks like a sharp cutter except for the corners gives a crap finish!

Aha!👍💡

[Neil WyattModerator @neilwyatt]

Posted by ANDY CAWLEY on 28/05/2015 06:00:19:

Posted by John Stevenson on 27/05/2015 22:43:22

As regards the striations brought up by various people it is of no consequence to the finish as milling cutters are not ground flat across the face but a very shallow inverted vee with the outside corner being the lowest so in effect although the whole of the cutter is removing material the corner is doing the finishing just like a fly cutter.

NEXT

Which explains why what looks like a sharp cutter except for the corners gives a crap finish!

Aha!👍💡

And why a useful* bodge for coke-can engineers is to grind some relief on the corners of a blunt endmill.

Neil

*Should that be 'an useful'?

[Douglas JohnstonParticipant @douglasjohnston98463]

Posted by Bogstandard2 on 27/05/2015 21:40:37:

To all you doubters who seem it is right to badmouth this product when you have no intention of purchasing one.

Unwarranted insult remioved by Moderator.

 

Is this really the way to conduct a forum exchange. My comment about the appearance of the ground edge was not me badmouthing the unit but merely commenting on the picture posted. As I pointed out later the appearance of the cutting edge was probably as much to do with the difficulty of taking a photograph of the cutter as the quality of the grind.

I can understand , having spent a lot of money, you don't want to hear a comment you don't like, but please don't descend to abuse in your response.

Doug

 

 

Edited By JasonB on 28/05/2015 13:02:40

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Neil Wyatt on 28/05/2015 08:44:21:

*Should that be 'an useful'?

.

Not unless your pronunciation of useful is very odd.

**LINK**

MichaelG.

.

P.S. … As un 'ed 'itter … you might find the "grauniad" style-guide useful

Edited By Michael Gilligan on 28/05/2015 09:32:04

Edited By Michael Gilligan on 28/05/2015 09:34:27

[Anonymous]

Posted by Bogstandard2 on 27/05/2015 21:40:37:

Unwarranted insult remioved by Moderator.

Tut-tut, if you're going to post a diatribe at least make sure the spelling is correct.

Andrew

Edited By JasonB on 28/05/2015 13:04:03

[davebParticipant @daveb17630]

Posted by Michael Gilligan on 28/05/2015 09:13:10:

Posted by Neil Wyatt on 28/05/2015 08:44:21:

*Should that be 'an useful'?

Nah! it's like an'otel, aint it?

Dave

[Neil WyattModerator @neilwyatt]

Posted by Michael Gilligan on 28/05/2015 09:13:10:

Posted by Neil Wyatt on 28/05/2015 08:44:21:

*Should that be 'an useful'?

.

Not unless your pronunciation of useful is very odd.

**LINK**

MichaelG.

.

P.S. … As un 'ed 'itter … you might find the "grauniad" style-guide useful

You obviously missed the kerfuffle about Brooklyn Beckham and Stephen Hawking.

I read the Grauniad guide way back when it was a print-only document. don't agree with it all, but is is only a guide.

Neil

[Author]

Posts