Offset problems

[Becket88]

Hi guys!
I have this problem that my Roland DWX51D machine ruined my crowns edges as you can see the images. It's something like that the burr didn't know where is offset. I think i do everything for example Automatic Correction, change old burr(0.6mm,1mm,2mm),tightened the collect, the table is stable where is the machine etc. I use 3shape and Sum3d. Thanks for any help.
https://ibb.co/eTmKgR
https://ibb.co/i33zgR
https://ibb.co/eOEdam
https://ibb.co/eE3h1R
https://ibb.co/nofJam
https://ibb.co/kQ7aMR
https://ibb.co/eOEdam
https://ibb.co/noWD86
https://ibb.co/eE3h1R

 

[JMN]

Not the same machine, but some ideas that might help before the cam geniuses wake up from their CS and WOW all nighters.

http://dentallabnetwork.com/forums/threads/offset-milling-roland-dwx-50.25429/

But to my way undertrained eye, it looks more like chipping than offset issues.
What are your margin thicknesses, feed rate, tool rotation speed. These are where I'd start if I was standing next to it.

 

[Sevan P]

What offset are you currently running? On all my vhf mill i never have chips like that until the buts are really really really old and even then the 2.5mm will break the unit out of the disk. I run a 0.20 offset at 65 degrees then 0.20 extension no issue and longer bur life. Just a thought, either have thin margins and shorter bur live or thicker margins and longer bur life.

 

[Becket88]

For the first time when designed crowns,bridges I set the offset thin(0.08) so I have less work with after sinterising but the edges were little bit chipped therefore I set the offset all work that design thicker (0.2)

 

[user name]

Hi guys!
I have this problem that my Roland DWX51D machine ruined my crowns edges as you can see the images. It's something like that the burr didn't know where is offset. I think i do everything for example Automatic Correction, change old burr(0.6mm,1mm,2mm),tightened the collect, the table is stable where is the machine etc. I use 3shape and Sum3d. Thanks for any help.
https://ibb.co/eTmKgR
https://ibb.co/i33zgR
https://ibb.co/eOEdam
https://ibb.co/eE3h1R
https://ibb.co/nofJam
https://ibb.co/kQ7aMR
https://ibb.co/eOEdam
https://ibb.co/noWD86
https://ibb.co/eE3h1R

Pull a couple burs out...DONT TOUCH them in ANY WAY. Snap a nice close pic and post it please.

 

[technician]

Hi when I have been trying to alter my milling strategies with quicker roughing I did get the same result in this case made by the 2mm burr.
Do one crown adjusting the settings in Vpanel. Go to settings then override and set cutting speed to 60% if crowns comes out ok then it is your milling strategies.
Also if so it could be your milling strategies are not made for your Zi discs. Contact your re-seller for what milling strategies to use.
I hope this might help.
!

 

[user name]

Ive said it before, Ill say it again.I bet youve got damp air. Zr dust cakes on the bur when its moist. The bur isnt cutting because its getting clogged, the machine continues to push and the margins chip.

 

[Becket88]

Not every milling causes chipping. I don't think I have got dump air because if there's water in the system I see it in the pressure-gauge.

 

[user name]

Not every milling causes chipping. I don't think I have got dump air because if there's water in the system I see it in the pressure-gauge.

Not necessarily true. What you see in the gauge is condensate. Thats collected and condensed water. You could get that from any level of moisture in the air. But since you dont know the answer to your problem, feel free to discount what Im saying and continue to wonder what else it could be. Hot air holds much more moisture than cold air. Do you know your air supply temp? Its likely going to be much hotter on bigger cases because your compressor will be running more. Are you running an after cooler? refrigerated dryer? Those are an absolute must if your compressor is going to be running/cycling during a mill job. You would ideally be out putting air with a -40 dew point. Anything less than -20 and you will have sticky dust and margin problems....but you know that so it must be something else. Of coarse.

 

[JMN]

@Beckett88 , despite Usernames tag at the bottom regarding ignorance, he's usually pretty on point with his suggestions.
Take the time to look into a possible solution before dismissing it, otherwise you may fight for a long time as you can't win fighting the wrong challenger.

 

[technician]

Not every milling causes chipping. I don't think I have got dump air because if there's water in the system I see it in the pressure-gauge.

Do you use good quality discs? Have you tried with other brands?

 

[brayks]

Well Know Member is absolutely right. Clean, dry air is extremely important in a mill; it not only affects cutting tool efficiency and wear it also plays a big part in machine performance and reliability. Any user of a CNC mill should install at minimum, a dryer to make sure no moisture gets in the air that not only provides cooling to the tool and spindle but also provides spindle function and tool change operations Do that and many problems go away, and your machine will reward you for it with increased performance, longer tool life and higher-quality restorations.