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fly cutter wear

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Neil Wyatt25/09/2020 21:40:42
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Posted by Philip Burley on 25/09/2020 15:43:42:

I have borrowed a rev counter , the slowest speed my mill will run is 250 , which looks a bit fast compared with Martin's video So maybe thats my problem

Phik

You also appear to be cutting at a larger diameter, can you reduce it?

Neil

Vic25/09/2020 22:09:12
2602 forum posts
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As I mentioned in another thread this is one of the inserts I use on my Fly cutter. The insert is for turning aluminium on a lathe but works fine on the mill. I haven’t chipped one yet but I obviously don't take deep cuts. I have a larger insert for use on steel or just a plain HSS tool piece.

108081cb-b9e3-4be9-80ae-cb4856590444.jpeg

Nigel McBurney 127/09/2020 09:58:31
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with a low speed of only 250 rpm and a cutting speed of 100 feet per min ,the max radius of cut using HSS tools is only about 3/4 of an inch, tool wear is due to using too high a cutting speed, If speed cannot be reduced then carbide is the answer, the older style carbide cutters with the carbide brazed to a steel shank produces quite good results,better than using screwed on inserts ,the brazed shank is more rigid.

Vic06/10/2020 18:58:11
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Posted by Nigel McBurney 1 on 27/09/2020 09:58:31:

The older style carbide cutters with the carbide brazed to a steel shank produces quite good results,better than using screwed on inserts ,the brazed shank is more rigid.

That sounds reasonable in theory but in practice there seem to be an awful lot of folks out there using inserts in fly cutters to good effect so I think your “better results” comment may not stand up. I’ve had excellent results using inserts. These guys certainly seem to be getting a good enough finish as well:

**LINK**

Posted by Martin Connelly on 25/09/2020 11:00:34:

The temptation to go too fast is always there.

Martin C

On a couple of occasions I’ve done this on purpose and got a very nice surface texture with the right type of tool grind!

ChrisB06/10/2020 19:56:47
548 forum posts
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I made on based on the suburban linked above using tnmg inserts. Admittedly it's on the larger side for a hobby mill but I get a decent looking finish with it. Experemented a bit with the inserts and it seems the best finish I had with larger tip radius inserts.20180606_092138.jpg

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