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View Full Version : 'End mill sharpener' on Oz ebay



bob ward
09-13-2010, 08:18 AM
Does any one recognise or have any comments on this end mill sharpener currently on ebay in Australia?

http://cgi.ebay.com.au/ENDMILL-GRINDER-SHARPENER-CNC-ENDMILL-/130429095052?pt=LH_DefaultDomain_15&hash=item1e5e2e0c8c#ht_500wt_919

Is it all there? I don't know much about sharpening devices, but they generally look to be more complicated and have a few more bits and pieces to them than this one does.

gary350
09-13-2010, 08:58 AM
I made my own end mill sharpner. Get a block of CRS steel 4" diameter about 3" thick. Mill a 1" flat on the side in 4 places 90 degrees apart then drill a hole next to each flat for each size end mill you want to sharpen. Drill each hole at a 5 degree angle. Put a set screw on the flat side to lock the end mill so it will not turn. Make a stop that touched the flute for locating the end mill. Place the metal piece on the surface grinder table with one of the flats against the back stop of the magnetic chuck. The 5 degree angle hole should hold the end mill the correct way so the sharp edge of the end mill gets a 5 degree relief. Use the surface grinder to shapen each flute one at a time. Loosen set screw, rotate end mill, lock set screw, shapen next flute. It works great I can shapen a 4 flute end mill only on the tip end in just a few minutes. This tool will not shapen the end mill sides usually the tips needs shapening more than the sides so that is all I shapen and it works great 98% of the time.

If the tip of the end mill is extremely bad I use the bench grinder to grind off abour 1/16" or 1/8" of the end mill tip before I shapen it on the surface grinder. I also grind an X in the center of the end mill so it is not center cutting anymore that makes it much easier to shapen the ends. I don't have a large amount of end mills to sharpen a few end mills per month does justify buying expensive equipment to do it myself.

If I pay to have them shapended only a few dollars more will buy a brand new end mill.

philbur
09-13-2010, 09:11 AM
Looks like a single lip cutter grinder to me. Ask the seller to show/explain how he makes/sharpens end mills with it.

Phil:)


Does any one recognise or have any comments on this end mill sharpener currently on ebay in Australia?

http://cgi.ebay.com.au/ENDMILL-GRINDER-SHARPENER-CNC-ENDMILL-/130429095052?pt=LH_DefaultDomain_15&hash=item1e5e2e0c8c#ht_500wt_919

Is it all there? I don't know much about sharpening devices, but they generally look to be more complicated and have a few more bits and pieces to them than this one does.

oldtiffie
09-13-2010, 09:16 AM
Bob.

Too bad you didn't post this before 11.00 am AEST today as we left home then and passed through Scoresby both ways. I'd have been only too pleased to ring the seller and check the machine out. I won't be over that way for weeks yet as its about 50KM from here.

I may be missing something, but I really can't see how it works. I will say that it most likely will sharpen the ends of end milling cutters. I can't see how it will sharpen the spiral flutes accurately.

I note that there are three collets "up to 1/4" but it doesn't say what type of collets are used (ie common or proprietary or "special") or if it can handle larger collets or even if they are available and from what source. I will be surprised if you are not interested in sharpening end mills with a shank in excess of 1/4".

I got the impression that it is more to do with "pointed" and milling cutters - such as engraving cutters.

I wish I was able to see it and discuss it with the seller.

His (mobile/cell) phone number as per the eBay page is: 0422898059

The auction finish time is: 14 Sep, 201013:14:55 AEST which is less than 24 hours away.

Why not ring the seller?

A bid of AU $306.50 at this stage suggests that someone (more than one?) either knows a lot about that item or just wants it anyway, or is perhaps just taking a chance.

"End mill sharper" always attracts interest on this forum as well.

Sorry I can't be of more (any?) help.

GadgetBuilder
09-13-2010, 09:46 AM
It looks like the unit advertised as a "Universal Cutter Grinder" in the US. It is a knock off of the Deckel SO single lip cutter grinder used to make and sharpen cutters for engraving.

I tried several years ago to use one to sharpen end mills with very limited success and eventually returned it. See: http://www.gadgetbuilder.com/CutterGrinder.html

The unit on eBay seems to be missing the majority of the attachments that normally come with it in the US, not sure about units supplied to Australia. There is more info on how to use it for end mills on the net now than there was when I tried it. I don't think it is well adapted to sharpening end mills but perhaps I'm just inept.

John Stevenson posted about its limitations for end mills some time ago so you may find more info by searching the forum for "Universal Cutter Grinder". See: http://bbs.homeshopmachinist.net/showpost.php?p=536645&postcount=10

John

Edit: added link to John Stevenson comments

aboard_epsilon
09-13-2010, 10:17 AM
Does any one recognise or have any comments on this end mill sharpener currently on ebay in Australia?

http://cgi.ebay.com.au/ENDMILL-GRINDER-SHARPENER-CNC-ENDMILL-/130429095052?pt=LH_DefaultDomain_15&hash=item1e5e2e0c8c#ht_500wt_919

Is it all there? I don't know much about sharpening devices, but they generally look to be more complicated and have a few more bits and pieces to them than this one does.

Yup these are made for engraving cutters ..you can sharpen endmills on them but you need the special attatchments to do so .

all the best.markj

Mcgyver
09-13-2010, 11:35 AM
I'd pass. there's countless threads here on them, there intended function is as stated, not endmills. While another thread here convinced me that with the right accessorizing it is possible to grind endmills on them, imo its beyond a stretch, more like misrepresentation call these thing end mill or tool and cutter grinder. An analogy might be calling a benchtop chinese lathe a tool room lathe because it can make tools in room; its is misrepresentation beyond just stretching the truth.

An endmill sharpener typically is set up for , and comes with, an air bearing and finger rest arrangement so the flutes can be drawn across the wheel while following the helix...anything less is not going to make you happy if you want an endmill sharpener, imo.

Disaster area
09-13-2010, 12:31 PM
some information on running this machine:

http://www.youtube.com/watch?v=e7Ah89B4J-4&feature=related
http://www.youtube.com/watch?v=CkYVUy7hmDk&feature=related
http://www.youtube.com/watch?v=1VU8S7wcecE
http://www.youtube.com/watch?v=aEqtjKfapyM


ihth

* may require some translation ('hooter' =holder, etc)

miker
09-13-2010, 06:57 PM
Bob, here is the manufacturers we site listing accessories.

http://www.szrising.net.cn/list.asp?id=35

Rgds

oldtiffie
09-13-2010, 09:09 PM
Michael.

I checked that web site in China and while it answered a few questions but not all that I had, I was amused by this part of it:



Features :

JD-20A is a newly machine for professional engraver machine tools . For high precision work and better efficiency , it is desirable to sharpen your cutters by cutter grinder than simply by hand. The JD-20A cutter grinder is specially designed for this purpose. Other than surface grinding the cutter grinder can sharpen any cutter to whatever shape you want your cutter to be. Highly efficient, save and easy to handle will surely solve the problem of sharpening cutters for you and thus improve your productivity.

But, setting the "Chingalish" aside, I can see that it will do the end faces of an end mill - but certainly not "all cutters" - unless they are engraving cutters.

My guess is that the wheel speed (5,200 RPM) is for the Northern Hemisphere and will be for 60 ~ and either 120 or 240 volts. For our 50~ supply the speed will be reduced to a nominal ((5,00 x (50/60)) = 4,333 RPM).

There are plenty of small relatively cheap attachments for surface grinder that will do that job and use C5 collets. It is quite feasible to use a tilted "Spindexer" (mounted on an angle plate) to do the job as well at no cost if you have a "Spindexer".

oldtiffie
09-13-2010, 11:51 PM
That tool-grinder auction just finished at AU$431 x 0.92 = US$396

Somebody must have really needed or wanted it.

http://cgi.ebay.com.au/ENDMILL-GRINDER-SHARPENER-CNC-ENDMILL-/130429095052?pt=LH_DefaultDomain_15&hash=item1e5e2e0c8c#ht_500wt_919

luthor
09-14-2010, 05:09 AM
That tool-grinder auction just finished at AU$431 x 0.92 = US$396

Somebody must have really needed or wanted it.

http://cgi.ebay.com.au/ENDMILL-GRINDER-SHARPENER-CNC-ENDMILL-/130429095052?pt=LH_DefaultDomain_15&hash=item1e5e2e0c8c#ht_500wt_919

I think that "somebody" is going to be rather disappointed.

luthor
09-14-2010, 05:12 AM
What is going on with your number of posts Tiffie?

oldtiffie
09-14-2010, 07:39 AM
What is going on with your number of posts Tiffie?

Got rid of 'em.

The numbers get "clipped" or "pruned" back to zero when they get too high.

Notice that my "rank" never varies from "member" either.

I have no interest in numbers of posts or rank or station or seniority here - or elsewhere.

Others can do or not do as they like or wish with theirs.