32057Re: Bit life in steel
- Nov 23, 2012--- In firstname.lastname@example.org, "mattdbartlett" <mattdbartlett@...> wrote:
>Yes it's a good stream, I have trouble containing the spray, ;) I'm using the waterline finish pass to minimize the amount of material removed, if I use the roughing pass it cuts the path twice as wide for clearance, but half of that is full width cutting anyway and I'm just cutting out a part from flat stock. A CNC Plasma table would be a better fit but I have the mill. There is 1 place where the thickness is milled down but it's a small area compared to the whole part. Plus Meshcam is a 3D program and I'm fudging it use it as a 2D.
> I don't have any experience with SGS. It's probably better than the unmarked import mills in any case.
> You're using flood coolant, is it a good stream? IE, can you tell if chips are being flushed effectively? I also find it a little strange that you are using a waterline with a square end mill. Waterline is usually used on profiled surfaces, the kind of thing you would use a ball mill for. I don't have much experience with different cam software though, so that could just be the way that Meshcam does things. In AlibreCAM for example, I would use a profile pass with a square end mill.
>1 part was 270" of full width cut so 4 would be 1080" @ .020 deep. If I bump up the depth of cut it would shorten the length of cut. Gwizzard seemed to want .062 deoth of cut but I was afraid to try it, to many broken end mills in the pile. :(
> I ran your situation through GWizard, and I get slightly different numbers that you reported, but nothing significant. You say you are running 4 parts. How much cutting are we talking about here? Maybe you are just pushing the cutter past its limits.
>It looks dull to me, here are some comparison pics of new and worn, and the part in question.
> I can't give you a number for how long these things should last, as I have never worn an end-mill out, I always break them before that happens ;)
> One thing you might try, especially if you are removing lots of material, is a roughing end mill. They should let you take a deeper pass, with less chatter.
> Another thing you can do is to take a look at the end mills with a magnifier and see if they are really dull, or if you are chipping the cutting edge. This is more common with carbide than HSS, but I have done it to my fair share of HSS tools too.
Dull End mill Pic
New End mill Pic
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