Thick-ish line on zirc following tool path

[elichezshaw]

Anyone know why this line is appearing on our zirc units? We have a Rowland DWX-50. It seems like the line follows the mid-point. (or tool-path, I'm not sure how to describe it)

 

[Brett Hansen CDT]

This is basically the line where the mill will turn over the puck after it gets done milling the top/bottom. If you are seeing a heavy transition line on all your units, then I would calibrate your mill. If it's just on this case, it may be from the way the bridge is aligned in the puck. Another thing I would look at is where your supports are. I usually try and put them close to the cervical on anteriors and on the linguals as opposed to the facials so I don't lose my anatomy. I am never concerned if I put all four supports for a bridge like this on the lingual.

 

[Hao.Wang]

ur machine needs calibration. the main rotation axis is not at the center of stock. the toolpath from 0-180 has the dislocation

 

[Contraluz]

Anyone know why this line is appearing on our zirc units? We have a Rowland DWX-50. It seems like the line follows the mid-point. (or tool-path, I'm not sure how to describe it)View attachment 46269

On a side note, if you plan to open the embrasures, I'd recommend you to do that in the 'green state' and not after sintering. That way you minimize the stress on the sintered zirconia when fishing it.

 

[Car 54]

On a side note, if you plan to open the embrasures, I'd recommend you to do that in the 'green state' and not after sintering. That way you minimize the stress on the sintered zirconia when fishing it.

i.e. cracking.
Also, the thin Renfert Dynex white fiber discs work great for seperating and opening up the Incisal embrasures in the green state, as well as cutting emax press units off the sprue base.

 

[zero_zero]

ur machine needs calibration. the main rotation axis is not at the center of stock. the toolpath from 0-180 has the dislocation

That is typical with the DWX-50... axis "A" is off center

 

[Contraluz]

i.e. cracking.
Also, the thin Renfert Dynex white fiber discs work great for seperating and opening up the Incisal embrasures in the green state, as well as cutting emax press units off the sprue base.

I use thin diamond discs. Although, at times, they are a bit aggressive...

 

[tuyere]

FWIW that offset line can also be caused by excess wear on motion components like the ballscrews or rotaries. If calibration isn't addressing things, you may need to look at replacing those. I haven't rebuilt a 50-series so I can't speak to part availability or how difficult it'll be to do yourself, but it's not bad with the 51/52 series if you're mechanically-inclined.

 

[Labslip]

I'm searching for Renfert Dynex white fiber discs but I'm not coming up with anything. Can you be more specific? Perhaps a reference number?

 

[Car 54]

I'm searching for Renfert Dynex white fiber discs but I'm not coming up with anything. Can you be more specific? Perhaps a reference number?

Here you go, it may have helped if I had remembered "Brilliant" I bought mine from Zahn, below image. The red ones were really good for cutting off pfm's from the sprue base. The link should bring you to the English site, otherwise, that can be ticked at the top right of the webpage.

Dynex Brillant Trennscheiben

Diamantierte, elastische, glasfaserverstärkte Trennscheiben, speziell zum Trennen, Separieren und Verschleifen von Verblendkeramik, Zirkonoxid und Lithium-Disilikat.

www.renfert.com

 

[Labslip]

Awesome. Thank you. I currently use a thin diamond disc but it sometimes gets a little grabby. I'm excited to try these.