|Neil Wyatt||25/09/2020 21:40:42|
18221 forum posts
You also appear to be cutting at a larger diameter, can you reduce it?
|2602 forum posts|
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.
|Nigel McBurney 1||27/09/2020 09:58:31|
736 forum posts
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.
|2602 forum posts|
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:
Posted by Martin Connelly on 25/09/2020 11:00:34:
The temptation to go too fast is always there.
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!
|548 forum posts|
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.
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