How deep down before sideloads?

ChrioN · 09-24-2002, 06:34 AM

I'm sorry for doing a new thread everytime I got a new question, but I really need to know...

Hard to explain and my english sucks so I hope you have some understanding...

How much shall I "drill" the endmill down (Z) to the block before going sideways (X,Y)? It is Aluminium I'm going to mill.
Shall I go down like 1 cm or 0.2 cm? How fast? 100rpm? 2000rpm?

Damn it would be good if I got those answers...

Fixittt · 09-24-2002, 12:01 PM

It all depends on your machine really. What I would do is experament with it some. Take some scrap material and start at .050 deep then sideload. If it has no trouble, then go .100 deep. But I would keep it at about .100 that is what I have used on the bridgeport machines and its happy. Now on my little mill, with the 1/5 hp motor I could only go .025 to .035, so its all in the motor. Stay around .100 and you should be fine. For smaller dia. endmills you want a fester RPM, larger endmills you want slower. There is a mathamatical equasion to cutting speeds, but I dont have it in front of me at the moment.

That should help ya I think. Remember to use coolant of some sort, WD 40 is great for aluminum. And WEAR EYE PROTECTION always.

Have fun

ChrioN · 09-24-2002, 12:59 PM

That was a big help fixittt, now I have something to go on.

I dont know what motor I got but it's only 550W if thats any different, its 400V though.

The eye-protection-thing was a good thing to say, didnt think about that and wouldnt prolly do it either

hmm...you said that bigger endmill is equal to slower rpm...do you mean like 100 rpm with 1/2"? or more like 500rpm?

Nick C · 09-24-2002, 11:45 PM

well, I can see how you'de want a higher speed for the smaller bits, but, why slower for the larger? if you spin the bit faster, you are taking away less material per rotation than if you were going slower (maching brass, I jack the speeds up and move at a medium speed... and it leaves a very nice finish) , so does it matter? if it does, let me know!!

but then again, I do have that 1 HP bridgeport...

jaydee · 09-25-2002, 08:12 PM

My mill will onlyu handle up to 3/8"end mills and I run 1/8" up to 3/8" all at the same speed only because my mill tops out a3,000RPM. My mill will go do .125 or 1/8" passes at the mills slowest setting, which I have no clue what feed rate it is as it just has 1-6 for speed options. Guess I should time it one of these days. I have a pretty strong motor though. It says it has more tourque than a 1/2HP AC motor and I belive it. It is actually way to much motor for the mill it is mounted on.

You will just have to experiemnt a bit to find the mills optimal speeds per material and end mill. morphlin1 just posted some good info in another thread.

FARMER · 09-26-2002, 10:28 AM

Alot of rpm on a big diameter will make a lot of heat and when it comes to hss anything over 600 degrees (celcius) will make the hardening of the tool go away.¨

Thats most of the point with HM, they can take more heat.

Hate explaining machining in english, get a machining-education ffs

D

Fixittt · 09-26-2002, 12:13 PM

Without looking it up, I want to say that you want 100 inches a minute in the RPM. So with a smaller tool dia, you need to crank the speeds way you, and as the tool dia gets larger you need to compensate for that by lowering RPM`s. For a 120 mm hole saw you only want about 500 RPMs because the saw has a larger Dia. makin sence?

ChrioN · 09-26-2002, 12:55 PM

Yes it make sence now. Thanks. Tomorrow I will play around with it a little bit

I will take some pictures and keep you guys updated.

09-24-2002, 06:34 AM	#1
ChrioN Cooling Savant Join Date: Sep 2002 Location: Sweden Posts: 318	How deep down before sideloads? I'm sorry for doing a new thread everytime I got a new question, but I really need to know... Hard to explain and my english sucks so I hope you have some understanding... How much shall I "drill" the endmill down (Z) to the block before going sideways (X,Y)? It is Aluminium I'm going to mill. Shall I go down like 1 cm or 0.2 cm? How fast? 100rpm? 2000rpm? Damn it would be good if I got those answers...

09-24-2002, 12:01 PM	#2
Fixittt CNC Beyatch Join Date: Aug 2001 Location: Tulsa Spell it backwards Posts: 721	It all depends on your machine really. What I would do is experament with it some. Take some scrap material and start at .050 deep then sideload. If it has no trouble, then go .100 deep. But I would keep it at about .100 that is what I have used on the bridgeport machines and its happy. Now on my little mill, with the 1/5 hp motor I could only go .025 to .035, so its all in the motor. Stay around .100 and you should be fine. For smaller dia. endmills you want a fester RPM, larger endmills you want slower. There is a mathamatical equasion to cutting speeds, but I dont have it in front of me at the moment. That should help ya I think. Remember to use coolant of some sort, WD 40 is great for aluminum. And WEAR EYE PROTECTION always. Have fun __________________ Creator of the Spir@l Block Longest post ever http://forums.procooling.com/vbb/showthread.php?s=&postid=43808#post43808

09-26-2002, 10:28 AM	#6
FARMER Cooling Neophyte Join Date: Sep 2002 Location: Denmark Posts: 11	Alot of rpm on a big diameter will make a lot of heat and when it comes to hss anything over 600 degrees (celcius) will make the hardening of the tool go away.¨ Thats most of the point with HM, they can take more heat. Hate explaining machining in english, get a machining-education ffs D __________________ /FARMER, da man.

09-26-2002, 12:13 PM	#7
Fixittt CNC Beyatch Join Date: Aug 2001 Location: Tulsa Spell it backwards Posts: 721	Without looking it up, I want to say that you want 100 inches a minute in the RPM. So with a smaller tool dia, you need to crank the speeds way you, and as the tool dia gets larger you need to compensate for that by lowering RPM`s. For a 120 mm hole saw you only want about 500 RPMs because the saw has a larger Dia. makin sence? __________________ Creator of the Spir@l Block Longest post ever http://forums.procooling.com/vbb/showthread.php?s=&postid=43808#post43808

09-24-2002, 12:59 PM	#3
ChrioN Cooling Savant Join Date: Sep 2002 Location: Sweden Posts: 318	That was a big help fixittt, now I have something to go on. I dont know what motor I got but it's only 550W if thats any different, its 400V though. The eye-protection-thing was a good thing to say, didnt think about that and wouldnt prolly do it either hmm...you said that bigger endmill is equal to slower rpm...do you mean like 100 rpm with 1/2"? or more like 500rpm?

09-24-2002, 11:45 PM	#4
Nick C Cooling Neophyte Join Date: Sep 2002 Location: OREGON Posts: 62	well, I can see how you'de want a higher speed for the smaller bits, but, why slower for the larger? if you spin the bit faster, you are taking away less material per rotation than if you were going slower (maching brass, I jack the speeds up and move at a medium speed... and it leaves a very nice finish) , so does it matter? if it does, let me know!! but then again, I do have that 1 HP bridgeport...

09-25-2002, 08:12 PM	#5
jaydee Put up or Shut Up Join Date: Dec 2001 Location: Spokane WA Posts: 6,506	My mill will onlyu handle up to 3/8"end mills and I run 1/8" up to 3/8" all at the same speed only because my mill tops out a3,000RPM. My mill will go do .125 or 1/8" passes at the mills slowest setting, which I have no clue what feed rate it is as it just has 1-6 for speed options. Guess I should time it one of these days. I have a pretty strong motor though. It says it has more tourque than a 1/2HP AC motor and I belive it. It is actually way to much motor for the mill it is mounted on. You will just have to experiemnt a bit to find the mills optimal speeds per material and end mill. morphlin1 just posted some good info in another thread.

09-26-2002, 12:55 PM	#8
ChrioN Cooling Savant Join Date: Sep 2002 Location: Sweden Posts: 318	Yes it make sence now. Thanks. Tomorrow I will play around with it a little bit I will take some pictures and keep you guys updated.

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