Member postings for John Buckley 4

Hi Ramon,

Thanks very much. A lot of useful information there.

Regards,

John

Martin,

Thanks I will try this, It will certainly be quicker than making a holder.

Regards

John

Hi Martin,

I was thinking of making the new holder with a Standard reamed 6mm hole which will allow me to use some of the non Clarkson FC3 cutters. The problem being lots of people are selling FC3 cutters but they are not to the Clarkson spec.

If I put a true Clarkson cutter in this holder I could have nearly 2 thou clearance which seems a lot on a 6mm cutter

Being a bit tight I do not always buy the expensive cutters,

Regards

John

Edited By John Buckley 4 on 20/11/2012 20:35:07

Edited By John Buckley 4 on 20/11/2012 20:35:32

Thank you for all your comments.

It is not the difference between 1/4 and metric as I have some of both cutters and they are very different ie. metric in 1/4 holder is very sloppy., whilst 1/4 into a 6mm holder will never go.

The non Clarkson cutters could well be cheap or out of tolerance and this was my puzzle because while they are all less than 6mm when measured they would not go into the holder.

William's comment seems to fit, I was just surprised that they would do something like that.... making the hole under size.

Eccentricity is only a problem if you put a Clarkson cutter in a normally reamed hole because then the sloppy fit lets the grub screw push the cutter to one side.

I appreciate your comments because I was starting to think that I was doing something significantly wrong. I have made my own 1/4 holder. I think I need to do the same for a 6mm one.

If I make it from EN8 and harden it is it likely to distort, of should it hold size?

I would appreciate any help or comments to solve a problem that I am having with my FC3 holder.

I have a Clarkson FC3cutter holder which fits into the standard Autolock holder making it easier to use these throwaway cutters. This is the same type that has been recently featured in MEW as a home project. It has a 6mm fitting.

I have a Genuine Clarkson FC3 1mm cutter which fits perfectly however when I bought extra cutters for this holders some do not fit, some fit and some could be pushed into the holder but I am not sure that I cold get them out again.

I have done a bit of measuring but am puzzled by the results. Does anyone know what the official tolerances for hole and cutter shank should be or can you point me in the right direction.

My results are in 0.001mm compared to 6mm

FC3 holder hole -14

Genuine Clarkson milling cutter -30

Other makes of FC3 cutters -3 to -30