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Thread: Parting tool
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26th Apr 2019, 07:50 PM #31Diamond Member
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26th Apr 2019, 08:12 PM #32
I always grind mine at a slight angle so it cuts tbe part off first, then leaves the nib on the stock which is removed after the part is gone.
Using Tapatalk
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26th Apr 2019, 08:57 PM #33Most Valued Member
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26th Apr 2019, 09:27 PM #34
If this helps anyone,
I went looking for more info on chip breaking for a HSS parting Tool and found this:
https://www.youtube.com/watch?v=phhhbB2rmrA
Its similar to what I already have on a 3/4" x 1/8" though my ground groove is not as deep or as wide as the one shown. THE HSS is mounted in an old Lock type tool holder to which
I have welded a piece of 16mm SQ. cold rolled steel which, in turn fits in the QCTP.
I dressed my HSS tool after grinding with a diamond lap stone. My groove was formed with a dremel cut off wheel to make a central line.The semi circular groove was formed with a dremel mounted parallel diamond burr. The chip does not break often as I would like but comes out a lesser width than the tool.
My original source of info about the chip breaker groove was in an old machinists book I had a lend of.
My tool parts up to 30mm stainless OK,but I do have to minimise overhangs and use a brush on, sulphurised oil as well as observing the other normal requirements.
<edit : Sorry,no pics available due to a lack of a working camera/camera phone in our household>
Grahame
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26th Apr 2019, 10:39 PM #35Senior Member
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27th Apr 2019, 09:05 PM #36Diamond Member
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28th Apr 2019, 09:11 AM #37Golden Member
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The hollow top of the parting tool is to cause the chip to fold in slightly and become narrower so that they do not catch in the slot and thus assist with chip clearance.
Ken
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5th May 2019, 02:06 AM #38Senior Member
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14th May 2019, 03:58 PM #39Senior Member
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15th May 2019, 09:55 PM #40Golden Member
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The HSS blade is working for me. I am using the same profile for steel, brass, aluminium and stainless/s. I am parting off stainless steel in the video below, I think I could run it a bit slower, maybe a bit too fast on this one?
Sorry about the noise from the video...
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15th May 2019, 10:00 PM #41
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15th May 2019, 10:49 PM #42Diamond Member
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16th May 2019, 12:10 AM #43
Hi jackeroo,
Once you get those little curly C's you know its going alright.
I like plenty of lube and use a big bore syringe filled with Tricky's heavy duty tapping and cutting lube. It stinks a bit but rarely much smoke.
I buy it cos its made here in Queensland, Bundaberg to be precise.
Its like Pecks paste, a little bit goes a long way.
Grahame
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16th May 2019, 11:52 AM #44Golden Member
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The one in that clip is 30mm is diameter. For bigger stock to do step parting, that is to cut about 10mm in then widen it by 1/2 of the blade width, continue to go pass the cut by 5-10mm then move the blade back to the first position, keep doing that until it is done. I have done 50-60mm before. Longer part sticking out from the chuck I will use tailstock to support the end. If there is no hole in the middle I find that the blade can ditch under when it goes to near the end.
Regards,
Trong
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