Sharpening Fine tooth slitting Saws

Does anyone know where you can but a CBN grinding wheel to sharpen fine tooth slitting saws ideally 5 or 6 inches dia. I am thinking of a saucer/dish wheel with material on both the face and angled back side so a plunge grind would shape both the tooth face and the back of the next tooth.

thanks

Peter

Good question. I would like to know, too.

In the meantime, ARC do diamond wheels that, suitably applied, might do your job.

Edited By ega on 18/05/2020 08:08:49

Hi Peter why has the wheel have to be CBN as I would use a white aloxite wheel for that readily available from most grinding wheel supliers.

David

Perhaps because by the time you are part way round the saw the white wheel will need to be dressed?

Thanks ega

The problem with Diamond is its not good for grinding HSS where as CBN is ideal and unlike conventional grinding wheels maintains its shape. Someone must do it the professional cutter sharpening companies can do it so there must be something out there but where. I must have at least a dozen cutters that are all in need of treatment accumulated over years in our hobby.

Another thing does anyone know why the hole on a slitting saw is slightly eccentric? they all seem to be this way and its not the arbor.

Peter

Hi Pete, This thread may help solve your problem:

**LINK**

John

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Poor quality assurance

... They are not meant to be that way.

MichaelG.

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Ref: https://www.model-engineer.co.uk/forums/postings.asp?th=142966

Edited By Michael Gilligan on 18/05/2020 09:00:03

Thanks John

That is very interesting I have always thought Diamond for carbide and CBN for HSS. The one problem I have found with diamond dish wheels is the only one surface is coated normally the flat face where for my application I would like the angled face also to be coated.

Peter

Hi Guys,

The eccentricity is caused by the wear on the grinding wheel as it is moved in and out of each tooth as it goes around the blade. It also gets worse as the blade is resharpened.

Could one of the wheels of ARC;s EMG end mill sharpener be put to use, available in CBN

Thanks Jason

Yes but it would work well although a bit expensive since most of the coated surface would not be used only small angled portion.

Peter

Stefan Gotteswinter has done a YouTube video on sharpening saw blades which is worth watching:

Slitting saw sharpening.

In the latter half he refers to a CBN grinding wheel for gashing the gullet (sounds like a euphemism, but isn't). I haven't watched it for a while, but if he doesn't give details, you could drop him an email to enquire where he got his.

John

P.S.  His method should also alleviate the egg-shaped blade syndrome, too.

Edited By John Hinkley on 18/05/2020 10:32:13

Could you conceivably sharpen a saw with one of those small diamond-coated needle files? Fiddly but probably quicker than finding a suitable wheel and setting it up.

John Joiners used to sharpen and set wood saws by hand so I think a diamond needle file would do at a pinch

I do mine with a needle file, I first dress off all the teeth so they are the same hieght and then using a saw set, work each tooth, one left, and the next right. Then I start filing observing the cut so both edges work on each tooth.

Don’t really see why you cannot use diamond on HSS. I know the reasons why you should not, I worked in R&D for a Diamond tool company for many years, but for the amount we are doing compared to industry, does it really matter?

You want something like this, don't know how much or where to get one.

Martin C

I have a question about slitting saws. I have several from different sources over the years and have never had one that cut evenly. They all seem to be eccentric. I've used them on different arbors and in different machines but it doesn't make any difference.

As far as I can see you need shape 11V9 **LINK** . Centre Abrasifs **LINK** sells them. They can be very helpfull and once made for me a small series of grinding stones for very little money but Google gives also other suppliers for that shape. Niko.

Edited By speelwerk on 18/05/2020 12:01:46

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So what’s the question, John ?

... and did my earlier post not effectively answer it ?

Sorry but I’m rather bewildered.

MichaelG.