Page 1 of 1

New user shrinking issue

Posted: Wed Nov 26, 2014 2:17 am
by mazen2014
Hi all , just printed a ring using B9 1.2 , cherry resin ,, used cherry settings .. the ring size was size 17 .. or 18mm inside circle size ..... check the photos pleas
Image

New user shrinking issue

Posted: Wed Nov 26, 2014 2:25 am
by behold3d
I'm confused. What was the result? Why didn't it meet your expectations? What machine are you using? What post cure process are you using? What cleaning method are you using?

New user shrinking issue

Posted: Wed Nov 26, 2014 2:41 am
by mazen2014
when printed the ring , the size went smaller but some ring dimensions went larger ,pleas check photos .. what do you suggest went wrong??
Image
Image

New user shrinking issue

Posted: Wed Nov 26, 2014 5:24 am
by RobertH
I have the same problem, it is supposed to be anprojector caliberation issue, but no matter what I still get the shrinkage. I scale models 1.02 to get to where I am after curibg in the uv box. I got to check about other dimensions being bigger. This is on version 1.2

New user shrinking issue

Posted: Wed Nov 26, 2014 7:11 am
by RobertH
also mazen, the bigger the piece the more shrinkage occurs from my experience.

New user shrinking issue

Posted: Wed Nov 26, 2014 7:18 am
by mazen2014
Quote from behold3d on November 26, 2014, 09:25
I'm confused. What was the result? Why didn't it meet your expectations? What machine are you using? What post cure process are you using? What cleaning method are you using?


- I am using b9 1.2 HD ..
- the result are shown in the photos ..
- the mesurments are in millimeters ...
- I am curing with UV .. about 4 / 5 hours ..
-I am clening the prints with alcahol ..

New user shrinking issue

Posted: Wed Nov 26, 2014 8:00 am
by mazen2014
Thanx RobertH .. i ll try some more projector calibration and to make the peices 1.02 befor pronting to see what happens

New user shrinking issue

Posted: Wed Nov 26, 2014 8:38 am
by Robert Howle
I scale all models for setting and sizing to allow for shrinkage (3d scale at 1.015). Really heavy ones at 1.02.

New user shrinking issue

Posted: Wed Nov 26, 2014 8:40 am
by RobertH
yes do that, also if you could get the grid size laser cut on acrylic, so its more precise and doesnt bend for easier and more accurate caliberation, and I also use a loop to zoom in even more for the best focus. Start with 1.015 after that see what your results are and then if needed try 1.02 which I only do for big pieces.

New user shrinking issue

Posted: Wed Nov 26, 2014 10:46 pm
by mazen2014
Quote from RobertH on November 26, 2014, 15:40
yes do that, also if you could get the grid size laser cut on acrylic, so its more precise and doesnt bend for easier and more accurate caliberation, and I also use a loop to zoom in even more for the best focus. Start with 1.015 after that see what your results are and then if needed try 1.02 which I only do for big pieces.


RobertH .. can you post a photo of the grid size laser cut on acrylic pleas ? to understand what is it..

New user shrinking issue

Posted: Wed Nov 26, 2014 11:49 pm
by benoy
I am also facing this problem can some one explain how to apply this 1.02 or 1,015.
Can you do some thing to correct the calibration itself. Re size the calibration Grid or increase or decrease the projector position
Regards

Benoy

New user shrinking issue

Posted: Thu Nov 27, 2014 1:36 am
by Robert Howle
You can scale in the layout software itself. Myself and others scale our finished model. I select the model and scale 3d (all three axis).

Robert Howle

New user shrinking issue

Posted: Thu Nov 27, 2014 2:15 am
by benoy
Robert you mean scale down the model. ( What mean is you make the model small by 1.015)
Am I right?
Thanks Robert
Benoy

New user shrinking issue

Posted: Thu Nov 27, 2014 2:21 am
by Robert Howle
No. When u scale with 1.015 u are going up 1.5% (1.03 x size would be 3% up).

Robert Howle

New user shrinking issue

Posted: Thu Nov 27, 2014 3:07 pm
by benoy
Robert,
I think I missed something. In the printing process the object is getting bigger in size. (Due to some error). So to compensate for that error if you further increase the size of the object (by 1.015). Aren't you increasing the error?
Is there any thing wrong in the way I understood it?
Thanks

Benoy

New user shrinking issue

Posted: Thu Nov 27, 2014 4:16 pm
by Robert Howle
I misunderstood the post, sorry, but the thread title thru me it about shrinkage. Is the finger size bigger and the width and the thickness on your prints?

Did u check your scale settings in the layout to make sure they are 1 , 1, and 1 for X Y and Z?

Click on the image to enlarge (may already know this). Scroll to bottom of page.


Image