27 replies to this topic

[mkd]

from your FSwizard reference in other thread:
2.0" endmill, 1.8 width of cut, 2in deep@4.6 ipm

ya i know, it's ONLY 16 cuin/ minute

nice try though


Units:
Link: 11985

Surface Speed: f/min 143
RPM:
APT: in/tooth
Feed: in/min

MRR: 16.1 in^3/min
HP: 9.2
Torque: 2112.5 in-lb
Breaking Torque: 5502.9 in-lb
Cutting Force: 2112.5 lb
Tool Deflection: 0.0102 in
Max Tool Deflection: 0.0050 in
Effective Dia: 2.0000 in
Chip Thickness: 0.00204 in

[jeff]

lol so you're comparing a 2" cutter to a 1/2" cutter?
go away troll.

[mkd]

jeff, on 14 June 2012 - 12:06 PM, said:

lol so you're comparing a 2" cutter to a 1/2" cutter?
go away troll.

that wasn't very nice. i was never disrespectful.
thought we were have a gentleman's debate.

you came up with the .500 cutter, not me.

[mkd]

i was talking about "big" cutters from the start.
i guess some people are sore losers

for a more applicable application:
1.25 corncobb (uncoated/ slow RPM to be charitable to HSM fanboys)
169sfm 8.3 feed, 1.0 step over, 2 in deep= 16.6 cuin/min

or 723 rpm (240sfm) @12ipm for 23 cu in/ min.


or .450" step over at 18ipm= 16mrr


so 11MRR the HSM way is not automatically faster than old school (16 to 23 MRR). cant make that blanket statement.

[BenK]

With the speed and feed info both of you posted I put together a Mastercam test.

Material: 10" x 10" x 2" depth

2.00" hog end mill

sfpm: 143
ipm: 4.6
step over: 1.8"
depth: 2.00"

time:32 minutes


.5" end mill

sfpm: 780 (5962 rpm)
ipm: 180
step over: .06
depth of cut: 1.00" (had to make two depth cuts to reach 2.00" depth)

time: 19 minutes

[jeff]

Not only is it that much faster, but I can remove that much material while only holding onto about .100" in my vise.
You will have to have extra material to hold onto if you're using a corn cob because of all the tool pressure.

[mkd]

BenK, on 14 June 2012 - 01:01 PM, said:

With the speed and feed info both of you posted I put together a Mastercam test.

Material: 10" x 10" x 2" depth

2.00" hog end mill

sfpm: 143
ipm: 4.6
step over: 1.8"
depth: 2.00"

time:32 minutes


.5" end mill

sfpm: 780 (5962 rpm)
ipm: 180
step over: .06
depth of cut: 1.00" (had to make two depth cuts to reach 2.00" depth)

time: 19 minutes

uh, how you figure?
7 passes can cover a 10 x 10. with 2.0 cutter
@4.5 ipm it equals 19min
@9 ipm it quals 10 min (not that i would try this). better try 16 passes at 18ipm which is still half the time of your HSM "greatness"

guys "the emperor has no clothes"
give it up

[BenK]

It all depends on the machine I'm working on. If I'm using a big 50 taper machine that can handle a lot of tool pressure than I will use a bigger insertable cutter to remove material, but on a lighter 40 taper I will always go with the light radial engagement. Making a blanket statement either way is silly in my opinion. One big advantage with using light radial cuts is your tool cost; by using a smaller tool you only need to spend a fraction of the money.