Grinding HSS to use in Jones and Shipman Holders

[appletree]

Hi I have a number of J&S and Armstrong tool holders which take 1/4 square HSS bits. Does anyone know of any data on optimum grinding of HSS to use in these holders? I use indexible tooling or 1/2 inch square most of the time but I do like the adaptabi;city of HSS. Phil

[RobWilson]

Hi Phil


The tool profile all depends on what material your turning and whether its a finishing or roughing tool      so giz a clue 


Rob

Also is there any relief angle already built into the tool holder ?

[appletree]

Hi Rob,I knew that would come back to bite me, I thought when i posted and I fully appreciate the question and the reason for it. Mostly I machine aluminium and fairly free machining stainless, what I was asking is if there were any J&S data sheets which take in the inbuilt angles in the holders. Phil
 

[RobWilson]

  WHAT A CLOWN ! ,,,,,,,,,, I forgot to upload the photo/attachment  Phil


Just stick a tool bit in and you will see if there is any built in relief angle .


Rob 

[appletree]

Thanks for that Rob will have a look at the inbuilt angles, I have one of those digital angle gauges, will do some measuring. Phil

[lordedmond]

Phil

The angles do not have yo be that close within 1 deg is fine you will find that you need to tune them for your machine and stock , do not forget to stone a small rad on the tip you do not want a sharp point , think of twice the feed rate so that it overlaps for a smooth finish.

It's not an exact science play with it and see what works for you keep the SFM down to about a third of the carbide speed , above all listen and watch the chips that wil guide you.

One last point your surface finish is only as good as the finish on the tool so use a slip stone to refine the cutting edge no need to do the whole face just a little way down will do

Have fun

Stuart