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Fly cutter bits

Grinding angles

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Paul Barter07/02/2019 14:54:22
91 forum posts
5 photos

Hello to all,Time again to seek advice from you,I am trying to extend my meagre knowledge to include fly cutting, but I am having difficulty in working out the angles and orientation of the ground faces on the tool.Am I right in thinking that the angles required for the tool are those of left hand lathe tool? I am using the fly cutter in a lathe Chuck rotating towards me. Thanks again for any advice that may be forthcoming.


JasonB07/02/2019 14:58:06
15775 forum posts
1650 photos
1 articles

MEW 275 has a good drawing of a suitable bit.

Thor07/02/2019 15:18:14
1102 forum posts
31 photos

Hi Paul,

I hope this link may also be of help.


Neil Wyatt07/02/2019 15:43:02
16277 forum posts
679 photos
74 articles

It can help to put the blank in its holder and hold it against a surface and rotate it in the correct direction to get a feel for how it will function and which surfaces need to have clearance ground on them.


Martin Connelly07/02/2019 16:10:21
847 forum posts
99 photos

I use small lathe insert tools a lot of the time so similar angles to lathe tools work fine.

Martin C

Paul Barter07/02/2019 17:04:19
91 forum posts
5 photos

Thank you all,for your most helpful replies, I am much obliged.

Regards Paul

Martin Connelly07/02/2019 18:27:19
847 forum posts
99 photos

Just one additional thing that you should keep in mind, the cutting point needs to be further from the centre of rotation than the other low corner in order to avoid rubbing unless it (the non cutting corner) is higher than the uncut face you are removing. If you buy a fly cutter you will probably find that it holds the back face of the tool on the centre of rotation to help with this. It also means that it is easy to have a tool with negative rake if it is not ground to take this into account.

Martin C

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