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  #1  
Old 02-05-2018, 01:40 PM
de5 de5 is offline
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Join Date: Jan 2011
Location: Honea Path, SC
Posts: 914
Default Improvement to spindle warmup routine

My warmup routine has always started by revving up the rpms to max before settling back down to 9000. This fast start never made any sense to me, but since the machine came to me this way from CAMaster, I figured it was ok. After reading Brady's description of what happens to the bearings when they start cold, I looked at my warmup macro and made what I think is an improvement.

Here's the original macro:
G20
t4
g53z0
g53x5y40
m3
s9000
g4x120
s12000
g4x120
s18000
g4x60
m5
G23
[****** MACHINE IS READY ******]
g4x2
M51

All I did was added s5000 and g4x120 BEFORE the m3, because m3 starts the spindle at the currently programmed speed. Now the spindle starts slow and easy instead of zooming to 18000 cold.

New warmup macro:
G20
t4
g53z0
g53x5y40
s5000
m3
g4x120
s9000
g4x120
s12000
g4x120
s18000
g4x60
m5
G23
[****** MACHINE IS READY ******]
g4x2
M51

This runs the warmup at 5000 rpm for an additional 2 minutes, but that can be adjusted to whatever you like. The main thing is that it starts the spindle slow rather than fast.

Charlie
Attached Images
File Type: jpg Capture_warmup.JPG (35.8 KB, 34 views)
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Charlie Hind
Cobra 404 ATC with 12 tool positions & 4th Axis (2012-present)
(2006-2012 - K2 CNC... sold in 2012 to buy the Cobra)
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www.hindocarina.com
http://facebook.com/hindocarina

Last edited by de5; 02-21-2018 at 10:53 AM. Reason: corrected error
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  #2  
Old 02-05-2018, 01:49 PM
tbrookins tbrookins is offline
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Join Date: Mar 2015
Location: Warsaw Indiana
Posts: 122
Default

I changed my warm-up similar to yours.
I also added some X and Y movement to warm the servos too.. (I don't know if its needed, but its a neat program to watch run.)

I noticed you have the spindle on (M3) after the first dwell... I'm surprised your spindle even ran at the 5000 RPM.
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Stinger I
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T-track
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Stinger II 48x48
1.7Kw spindle
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  #3  
Old 02-05-2018, 02:16 PM
de5 de5 is offline
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Location: Honea Path, SC
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I see what you mean. Thanks Tracy; I'll put the dwell after the M3. When I did the warmup it started slow like I wanted and I assumed all was well. I think you're right; the dwell should come after the M3. Thanks for the heads up.
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Charlie Hind
Cobra 404 ATC with 12 tool positions & 4th Axis (2012-present)
(2006-2012 - K2 CNC... sold in 2012 to buy the Cobra)
WinCNC
www.hindocarina.com
http://facebook.com/hindocarina

Last edited by de5; 02-05-2018 at 03:13 PM.
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  #4  
Old 02-05-2018, 03:22 PM
tbrookins tbrookins is offline
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Location: Warsaw Indiana
Posts: 122
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Charlie,

Where do you get this spindle readout?
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Tracy Brookins

Stinger I
FTC & Laser
T-track
Kent Dust Shoe
Recoil

Stinger II 48x48
1.7Kw spindle
Kent dust shoe
Phenolic top with Hurricane vac & T-track
FTC & Laser

Aspire 9
WinCNC
Logictech Rumblepad

Warsaw Indiana
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  #5  
Old 02-05-2018, 04:02 PM
pentexco pentexco is offline
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Location: Chappell Hill, Texas
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This makes me wonder how often to warm up the machine... If I warm up in the morning and then let it sit for a couple hours should you warm it up again? Just to note... my shop is climate controlled and stays around 70 all the time.

Another question is what is harder on the spindle, Drilling or your typically cutting. I have 2 machines, both with HSD spindles... I cut tons of parts for Amazon sales. One part specifically I drill holes as well as cut the part out. I'm using a .25 end mill for both operations. I've drilled thousands of holes. Over time I have noticed that the spindle makes a different sound when drilling. Maybe just me... but I know the spindle has been getting louder over time.
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  #6  
Old 02-05-2018, 04:06 PM
de5 de5 is offline
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Tracy, if you mean the warmup macro, it's in C:\\wincnc\macros\warmup
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Charlie Hind
Cobra 404 ATC with 12 tool positions & 4th Axis (2012-present)
(2006-2012 - K2 CNC... sold in 2012 to buy the Cobra)
WinCNC
www.hindocarina.com
http://facebook.com/hindocarina

Last edited by de5; 02-05-2018 at 04:10 PM.
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  #7  
Old 02-05-2018, 04:22 PM
BradyWatson BradyWatson is offline
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Join Date: Oct 2014
Location: 1 hour South of Philly
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Quote:
Originally Posted by pentexco View Post
This makes me wonder how often to warm up the machine... If I warm up in the morning and then let it sit for a couple hours should you warm it up again? Just to note... my shop is climate controlled and stays around 70 all the time.

Another question is what is harder on the spindle, Drilling or your typically cutting. I have 2 machines, both with HSD spindles... I cut tons of parts for Amazon sales. One part specifically I drill holes as well as cut the part out. I'm using a .25 end mill for both operations. I've drilled thousands of holes. Over time I have noticed that the spindle makes a different sound when drilling. Maybe just me... but I know the spindle has been getting louder over time.
Years ago the PDS Colombo guy told me that their spindles were not rated for drilling and if there was extensive drilling to be done, an aggregate head was the right setup. If you look at big iron CNCs, they all use a head specifically for drilling. The main spindle is NEVER used for drilling.

Personally, I think that the major concern with drilling has more to do with shock loads than downward pressure on the spindle bearings. Slamming it down into the material is never a good thing...and the bearings being double angular contact are the right type for drilling...but can get dinged up and ruined from repeated shock loads. This is where tooling selection can also make a big difference in the amount of force to get material penetration. Loading up the end of the cutter (so the cutting edge is shrouded) or using a non-center cutting bit is bad news.

If you want to save the life of your spindle, think about adding an actual drill to your machine. The X3 option is great for this...or make your own from a suitable hand drill.

-B
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  #8  
Old 02-06-2018, 09:03 AM
tbrookins tbrookins is offline
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Join Date: Mar 2015
Location: Warsaw Indiana
Posts: 122
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Charlie,

I was referring to the spindle RPM chart you attached in your post.
Where did that come from?
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Tracy Brookins

Stinger I
FTC & Laser
T-track
Kent Dust Shoe
Recoil

Stinger II 48x48
1.7Kw spindle
Kent dust shoe
Phenolic top with Hurricane vac & T-track
FTC & Laser

Aspire 9
WinCNC
Logictech Rumblepad

Warsaw Indiana
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  #9  
Old 02-06-2018, 10:50 AM
de5 de5 is offline
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Join Date: Jan 2011
Location: Honea Path, SC
Posts: 914
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oic, that is just a picture I drew to show how the spindle warmup was starting before and after I changed the macro.
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Charlie Hind
Cobra 404 ATC with 12 tool positions & 4th Axis (2012-present)
(2006-2012 - K2 CNC... sold in 2012 to buy the Cobra)
WinCNC
www.hindocarina.com
http://facebook.com/hindocarina

Last edited by de5; 02-06-2018 at 10:54 AM.
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