Guest Demonstrator October 2004: Andre Martel
End-Grain Turning
Martel Hollowing Tool:
The MHT should never be used with the elbow up.
If this is done a severe catch will occur and the MHT may possibly snap off.
Sharpening of the
MHT is done using a diamond burr (150 grit) inside the curve of the tool and a diamond hone
(600 grit) is used both inside and outside to refine the edge. Honing might be done ten
times before grinding is again needed.
Endgrain Turning a Goblet:
The piece (pear wood) was placed between centers. A tenon was turned on the top part of the piece (tail stock).
The piece was removed and the tenon placed in the chuck.
The outside of the piece was then roughed with the Side Ground elliptical shaped fluted
Bowl Gouge with the tail stock in wood. A shear cut was used.
Then he removed the tail stock and the bottom of the goblet was first hollowed with the SGBG.
The MHT was then used to deepen the hollowing and further refine it. The angle of presentation of
the MHT is very critical as is the axial movement of the tool. This axial movement is in addition
to the lateral movements. A step was left over the final foot, in order to firmly grip without
breaking the final foot of the completed goblet. (At this point the interior of the goblet base could be sanded.)
The piece was removed and reversed in the number 2 jaws.
The top of the goblet was then hollowed using the upper cut with the SGB Gouge.
Again, the small MHT was used to give a final cut to the goblet interior.
(The MHT is rotated in order to keep bevel rubbing, as the cut progresses up from the bottom.
Lathe speed was about 700 rpm. (When achieving a shear cut lathe speed is not as important as
it would be with shear scraping, as even low rev. will leave a clean surface.
