Cutting Edges on Metal lathe Cutters

Cutting Edges on Metal lathe Cutters

This topic has 5 replies, 4 voices, and was last updated 30 July 2020 at 19:12 by larry phelan 1.

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29 July 2020 at 20:27 #488180
Chris TickTock
Participant
@christicktock
Hi Guys,

My issue has been to understand which edges on common metal tahe cutters are the edges that due the cutting (shearing) and those that would therewfore need sharpening.

Can anyone poiunt to a good explanation of say a right hand cutter?

Chris
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29 July 2020 at 20:27 #10352
Chris TickTock
Participant
@christicktock
29 July 2020 at 20:39 #488182
JasonB
Moderator
@jasonb
Your best bet would be to put a R/H cutter in the toolpost and watch what edge does the work as you cut, it will be the one contacting the work and doing the cutting.

As an example I have marked the cutting edge on this R/H tool in green

You can see it doing the cutting here, bit too heavy a cut for your Sherline but it does show the whole edge working.
29 July 2020 at 20:45 #488185
pgk pgk
Participant
@pgkpgk17461
In the geometry of the tool being held below the possible cutting edges are the side, the angled front and the corner between. The actual edges used to cut are between those faces and the top. However you really only need to sharpen the side and front and corner reliefs since that slicks up those edges with perhaps a little stoning of the top face to remove burs.

pgk
29 July 2020 at 21:11 #488189
Chris TickTock
Participant
@christicktock
Posted by pgk pgk on 29/07/2020 20:45:44:

In the geometry of the tool being held below the possible cutting edges are the side, the angled front and the corner between. The actual edges used to cut are between those faces and the top. However you really only need to sharpen the side and front and corner reliefs since that slicks up those edges with perhaps a little stoning of the top face to remove burs.

pgk

Wonderful video..thanks

Chris
30 July 2020 at 19:12 #488318
larry phelan 1
Participant
@larryphelan1
You could do worse than look up Sparey,s book, still good after 80? years.

He does [did ] explain this in simple terms [even I could understand it ]
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