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DIY parting off tool for T-bar parting off blade?

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PekkaNF:
I have a QCTP and some parting tools including some GTN3 tools.

I bought some 12 mm high and 1,6 mm narow T-type parting off blades. I would like to build a holder for it.
http://www.eccentricengineering.com.au/index.php?page=shop.browse&category_id=23&option=com_virtuemart&Itemid=3&vmcchk=1&Itemid=3

There is a parting tool holder:
http://www.eccentricengineering.com.au/index.php?option=com_content&view=article&id=31&Itemid=45
But it has some features I don't desire. And too many moving parts when clampped into QC holder.

I envisioned something simple and now I have been drawing and designing a "perfect" holder that has no serious drawbacks my other HSS-blade holders have. More I think of more I'm going circles :scratch:

I'm very tempted to tilt the blade about 3 - 7 decrees to give some rake. Stupid or smart? Aloris does it. Also my standard QCTP has it:
http://www.arceurotrade.co.uk/catalogue/results.aspx?search=090-070-00504
I'm cutting mainly different grades of steels, ocassionally some stainles steed and tough materials. Hardly never brass or coper metals. I'm willing to dedicate different tools for aluminium.

I have seen some drawings and holders that hold blade nicely without too much protrusion. But this blade is pretty square on the bottom and top. Very tempted to slit saw an apropriate grove for the body of of the blade and just put square clamp on the top. Would it work?

I ahve made some toolshanks, booring tools and QC holders, but this is somewhat new venture. Any advice?

Thank you,
Pekka

mechman48:
Hi Pekka  :wave:
I have a blade of the same type that I had put away many moons ago, simply for the fact that with the limited amount of parting off I did the ordinary style blade sufficed so I forgot all about it until I saw your post. I'm sure a lot of us would be keen to see your holder, or even your drawing, & I'm sure that your idea of a slit groove would work without any trouble.  :headbang:

Cheers
George

bp:
When I made my pillar and clamp on toolholder style QCTP, the parting toolholders looked like the attached picture (at least I hope it's attached!)  This was for a mini lathe, a Sieg C3, so it runs "backwards" ...clockwise looking from the tailstock.  They have worked very well, the blades are A. R. Warner 0.04" and 1/16" from LMS.  Routinely part off Al. Alloy at 800 or 900 rpm, steel at 400 rpm.
cheers
bp

PekkaNF:
Thank you.

May I ask few questions about this Bp tool-holder?

1) Judging from the last picture. Is there a little angle to keep the blade against the holder? If not, how well does the blade stays put? On quite a few design people have added some extra screws or camfered the blade and made mating surface.

2) What is the "rake" angle and how do you feel about it? Thank you on the material and rpm information.

I have some A. R. Warner HSS inserts and tool shanks. Like them. If you like Warner, you probably know also Mesa Tool (http://www.mesatool.com/)? Great place to shop. I specially like threading/grroving tools.

Pekka

unc1esteve:
I made a holder to match my QCTP following G H Thomas's design in The Model Engineers Workshop Manual.  I made mine with no angle.  Once the height is set to center the blade can be removed and sharpened and then returned to center with no further adjustment.  The angled design must be adjusted after each sharpening.

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