Cutting Edges on Metal lathe Cutters

[Chris TickTockParticipant @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

[Chris TickTockParticipant @christicktock]

[JasonBModerator @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.

[pgk pgkParticipant @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

[Chris TickTockParticipant @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

[larry phelan 1Participant @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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