605 forum posts
As always, Clive is right on the money.
I have a Bison QCTP (Dickson clone with 19 holders) that is on my lathe 96% of the time. I have the original 4 way tool post that is used 1% of the time and a home made lantern tool post sans rocker holding an Armstrong holder for those awkward lack-of-space jobs or one-off tool bits for the other 3%.
As you can see, i find the lantern/Armstrong far more useful than the 4 way.
|XD 351||26/01/2019 07:21:35|
1390 forum posts
Has anyone tried using the tangential tool with a brazed carbide on a square tool shank ? I have a couple of these tool holders from eccentric but rarely use them as I use carbide insert tooling for the most part but have always wondered if a chunk of carbide brazed onto the end of a piece of square stock then ground the same as the tool steel bit would work .
|John Haine||26/01/2019 07:46:59|
|2794 forum posts|
In this thread **LINK** a few years back I gave details on how to work out the angles to get different clearances. Thanks to Michael Gilligan I can now find old posts!
|2387 forum posts|
Not sure, it might work. Someone gave me several broken 1/4” solid carbide end mills so I tried one of those once ground in the Eccentric tool and it works great on hard stuff. I turned some HSS with it the other week.
|John Pace||26/01/2019 10:25:11|
|157 forum posts|
I silver soldered this 1/8 inch carbide shank into a suitable size square piece,the edge is milled out about half the diameter and the piece soldered in ,it seems to work best if left as a round shank.The round piece fits neatly between the clamp.
The one on the left is ground to conform the the square shank ,because carbide chips easily when ground to the acute angles of the diamond tool a shallower angle is needed at the top and both the sides need a little grinding for clearance.
Useful for harder materials and maybe cast iron.
|mark costello 1||26/01/2019 19:38:36|
555 forum posts
|John Reese||27/01/2019 00:06:30|
|817 forum posts|
With that high rake angle I bet it cuts very well in the beginning but will not last long. Sharp points like that on carbide are prone to chipping.
|John McNamara||27/01/2019 13:23:07|
1311 forum posts
Hi John Pace.
|John Pace||01/02/2019 19:36:01|
|157 forum posts|
Posted by John McNamara 7/01/2019 13:23:07
Hi John Pace.
GMTA I made the same toolbit using the carbide shank from a
I milled a piece of key steel of the correct size and silver
I don't use the supplied fixture to sharpen the toolbits,some while ago
Having 20 ground ends if one is dulled it goes in the grind box and
The carbide tips that are ground similar to a CCMT shape only need regrinding
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