EMG-12 Endmill Re-sharpening module

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Not unless your pronunciation of useful is very odd.

**LINK**

MichaelG.

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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

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

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

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Neil,

Yes, it is obvious [and almost inevitable] that I missed that.

... I generally try to avoid anything that includes the word Beckham

Thanks [?] for enlightening me.

MichaelG.

> Yes, it is obvious [and almost inevitable] that I missed that.

You should listen to Radio 4

Neil

Doug,

This is the response from the factory:

The standard SDC wheel fitted to the module has a 220 grit - which is considered by the manufacturer to be the ideal all rounder. 150 grit wheel is available and sometimes used for larger carbide end mills =>10mm depending on the quality/grade of carbide endmill being ground, but the finish is rougher, depending on various factors. 320 grit and 400 grit are also available, to deal with smaller endmills, to give a smoother looking finish, but the working life for the finer grit wheels are shorter, again depending on quality/grade of carbide being ground, and various other factors.

The standard CBN wheel - sold as spare for grinding HSS has a 150 grit. 180 and 220 grit are available, but again, the working life of such wheels will be shorter.

The factors which could affect the finish include how much the wheel is worn or clogged.

In the factories opinion, what is installed is considered to be the best all around choice.

Under magnification, the look does vary, but as JS says, the striations are of no consequence as the finishing is done by the corners.

Ketan at ARC

Given the attraction of building tool & cutter grinders I'm not surprised at the level of interest in this machine. What's interesting to me is how it turns conventional wisdom on its head. Conceptually it's like those rather duff drill grinders where you stick the drill in a collet, thrust it into a plastic housing against a grinding wheel and rotate the collet against a cunning cam to shape the end of the drill. The difference is that this works, and on cutters that are supposed to be much more "difficult" than drills.

I've got a Quorn which my father built. It took him months of his retirement and he made a load of the accessories in the book, but once built he almost never used it! I find it so fiddly to set up that I hardly ever use it either and I keep on trying to work out easier ways of sharpening end mills! So when I saw this my first thought was, how does it work, and how could I make one? I don't think I'd buy one myself but I might join an ME club that had one!

now if it had another couple of ports at angles that did 4 facet drill grinding too....!

But I hope this is really successful and good on Ketan for taking the risk to import it.

Thanks Ketan for that information about the grinding wheels, my earlier comment about the appearance of the ground edge was not meant as a criticism of the machine, which I much admire.

Doug

I took a handful of 10mm slot cutters to Harrogate and John kindly sharpened them in return for a donation and lots of questions!

I have used one of the cutters for the first time tonight and I cant complain! All these cutters where telling me they werent happy the last time they were used so were put to one side for sharpening or more likely the bin.

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A very serious question for the Motorators, if I may:

Is [Bogstandard2] John's assertion True or False ?

MichaelG.

Michael,

I'd love to comment as a moderator but I feel I am too close to the subject matter so will leave it to one of the others.

At the moment i am on my way out so don't have any time anyway but I will make a reply tonight as a member of this forum and not with my moderators hat on.

John S.

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Thanks, John

Your position is understood, and appreciated.

MichaelG.

Personally, I didn't take it as criticism Doug. The first time I saw the results, I too raised the same question with John Stevenson, and was quickly put right by him, in his usual Ilkiston way . If not you, someone else would have raised the same point..It just happened to be another Johnston. Two Johnstons in a row may have made it look like a criticism to some - especially new comers to the thread, but I also know Andrew Johnston well enough to know that there was no criticism intended.

Initially, there were some concerns and eyebrows raised near the beginning of this thread, but that I would suggest was partly my own fault for adverting in ME before the review came out in MEW, as I have mentioned before.

When John 'Bogs.' called to purchase the machine, (prior to the two Johnstons comments ) he was aware that I was worried at the time because I did not know how the product would sell. A culmination of events may have resulted in certain comments made by John 'Bog.'. To John Bogs I would say - thank you, relax and please don't worry, all is well.

Again, to the two Johnstons I would say, don't worry, I took your comments as observations - not criticism.

Regardless of anything, this is an open forum, and I respect that everyone has and should have the right/ability to express their own opinion.

John Bogs is a friend as well as a customer, who has his own views. Similarly, there are many other people who have contributed on this thread who have their own views - be they positive or negative or perceived negative or questions, buyers or non-buyers, who I know as customers and friends, or people I don't know.

I do not take any comments as personal. I would politely request that we all relax and carry on with any questions, regardless of the poster being a buyer or not.

Ketan at ARC.

I will also defer this one to Neil and Diane.

As a Personal view I think all the questions and queries raised are quite justified and not made to critisise the machine. For all we know the people asking about grinding wheel wear, size of cutters catered for and the ground finish may well be interested in making a purchase and would like some more details before parting with the cash.

I too thought the ground edge looked quite coarse from the early photos and would still be intetrested to see how the cutters perform when plunged as that is when the end is doing the work.

J

John,

I rather feel you want to close down all discussion of the machine from people who don't own one. The point I raised about the grinding elicited a very polite and helpful response from Ketan, which I much appreciated ,and would also be helpful to others who are considering the machine. Surely this is what the forum is all about. I think we should call a truce on this one, life is too short to argue about who has the right to speak.

Doug

It is always the same with Johnstons, you wait for ages to hear from one then two come along at once.

Doug

I have no problems with people discussing a machine like this. the reason I wanted an 'exclusive' on the machine was exactly because I thought it was different enough to create a lot of interest and discussion, which it certainly has. I was under no illusion that it would be anything other than a niche product, but I could also see that there would be a reasonable market.

As for only owners or prospective buyers having opinions on things, then we would have very little left to talk about in here...

Neil

Michael would it be possible to say what depth of cut and proportion of the cutter was used on this part.

To my eye and looking at the length of the swarf the finish we can see on the part was a full depth cut possibly climb cut as is common on CNC machines so little of the resharpened tip would have come into play. The only part that the tip may have affected is where the tool ran out into the ali plate where there is a burr that can be seen on the first photo on the nearest edge where a climb cut would not have been applied.

Just curious as to which part of the cutter has actually done the work.