Re: [CAD_CAM_EDM_DRO] Re: Inserts in the home shop

Grinding HSS tool bits isn't really all that hard. They DON'T need to be
ground to high accuracy as everyone probably thinks....after all...the tool
posts are adjustable. For rough work I just grind the angles "to suit"
which might be way off "book" values, but for finish work I generally hone
the edges with a diamond file and round off the cutting point...and I still
don't need to maintain super critical angles.

Smoke

-----Original Message-----
From: Jerry Kimberlin <kimberln@...>
To: CAD_CAM_EDM_DRO@yahoogroups.com <CAD_CAM_EDM_DRO@yahoogroups.com>
Date: Thursday, May 10, 2001 6:26 PM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Inserts in the home shop

>stratton@... wrote:
>
>> I can't say categorically tht they don't exist, however I can think of
>> two major problems with HSS inserts:
>>
>> 1) They would wear out quickly, and resharpening would quickly
>> use up the chipbreaker groove
>>
>> 2) They would be too expesnive to make. Carbide inserts are (I think)
>> made by pressing powder into a mold and sintering it. HSS steel ones
>> would need some kind of 5 axis cnc grinding machine to get the same
>> shapes.
>
>I came to the same conclusion. Why would one want them? HSS
>tool bits come in 1/2" square bars that can be ground rather
>easily, if you are adept at grinding at all (I'm not). That is
>the same size as my insert toolholders' shanks.
>
>There are specialty HSS inserts, of course. Kaiser Tool Company
>(thinbit) makes them for grooving tools to fit their
>toolholders. I also have some triangular HSS inserts for a
>boring bar made by Everede. These are listed in the Travers Tool
>Cat page 336-337. So I think the general answer is: "Yes, they
>exist." But if you want HSS tool bits to replace something like
>a TPG or TNMG, the answer changes.
>
>JerryK
>
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