MadModder
The Shop => Tools => Topic started by: appletree on April 25, 2015, 12:59:30 PM
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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
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Hi Phil
The tool profile all depends on what material your turning and whether its a finishing or roughing tool :dremel: so giz a clue :)
Rob
Also is there any relief angle already built into the tool holder ?
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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
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:Doh: 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
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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
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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