RE: [rp-ml] shifting of layers

I have to agree with Tracy on the Galvo shift being relatively rare. I want to throw in another question or two.

Have you watched the build when this occurs?
Are you getting any curling of the parts after scanning? Right after an Add Powder Layer?
Are the dimensions of the parts accurate in the shifted area (as far as wall thickness)? Outside of the shifted area?

Tim Gornet Manager, RPC Operations
email: tim.gornet@louisville.edu<mailto:tim.gornet@louisville.edu>
Rapid Prototyping Center
Vogt Bldg. Rm 101, University of Louisville, Louisville, KY 40292
Phone: (502)852-0714 FAX: (502)852-8890
http://www.louisville.edu/speed/rpc/

From: owner-rp-ml@rapid.lpt.fi [mailto:owner-rp-ml@rapid.lpt.fi] On Behalf Of VRT BV
Sent: Tuesday, October 09, 2012 5:01 AM
To: Taylor, Tracy L PWR; rp-ml@rapid.lpt.fi
Subject: Re: [rp-ml] shifting of layers

Dear Tracy,

Is the shift in the direction of the roller? > yes

Are all parts on the layer affected by an identical shift? > yes

Is it more obvious in the center or at the outer edges of the part bed? > no

The leg of the part that extends towards the top of the picture is curved. Is that the correct shape for the model or is that distortion? > that also is distortion

Met Vriendelijke Groeten,
With Kind Regards,
Mit Freundlichen Grussen,

Bart

Your RP-partner for Stereolithography, SelectiveLaserSintering,3-D Printing,RapidBlowMoulding,VacumeCastings and Small Series
_________________________________________________________________________________
VRT - Ambachtsweg 4 - 5683 CD Best - Tel: 0499 330774 - Fax: 0499 330778 - Email: info_at_vrt.nl<mailto:info_at_vrt.nl> - Site: www.vrt.nl<http://www.vrt.nl>

----- Original Message -----
From: Taylor, Tracy L PWR<mailto:Tracy.Taylor@pwr.utc.com>
To: VRT BV<mailto:info@vrt.nl> ; rp-ml@rapid.lpt.fi<mailto:rp-ml@rapid.lpt.fi>
Sent: Monday, October 08, 2012 6:15 PM
Subject: RE: [rp-ml] shifting of layers

I know you are looking for answers, but I have a few more questions. Complex problems with the galvos do happen, but in my experience they are very rare (3 incidents in 12 years at our facility).

Is the shift in the direction of the roller?

Are all parts on the layer affected by an identical shift?

Is it more obvious in the center or at the outer edges of the part bed?

The leg of the part that extends towards the top of the picture is curved. Is that the correct shape for the model or is that distortion?

I'm taking the simple approach to start with. Please excuse me if the questions seem trivial based on your experience.

Tracy Taylor
Strategic Fabrication Center
Pratt & Whitney Rocketdyne, Inc.

From: owner-rp-ml@rapid.lpt.fi<mailto:owner-rp-ml@rapid.lpt.fi> [mailto:owner-rp-ml@rapid.lpt.fi]<mailto:[mailto:owner-rp-ml@rapid.lpt.fi]> On Behalf Of VRT BV
Sent: Monday, October 08, 2012 12:56 AM
To: rp-ml@rapid.lpt.fi<mailto:rp-ml@rapid.lpt.fi>
Subject: [rp-ml] shifting of layers

Hello Everyone,

Do any of you have a solution for shifting of layers with a DTM 2500 plus machine?
The problem occurs only at certain layers, mostly the first 5 mm of the part.
See attached picture.
Thanks a lot in advance.

Met Vriendelijke Groeten,
With Kind Regards,
Mit Freundlichen Grussen,

Bart

Your RP-partner for Stereolithography, SelectiveLaserSintering,3-D Printing,RapidBlowMoulding,VacumeCastings and Small Series
_________________________________________________________________________________
VRT - Ambachtsweg 4 - 5683 CD Best - Tel: 0499 330774 - Fax: 0499 330778 - Email: info_at_vrt.nl<mailto:info_at_vrt.nl> - Site: www.vrt.nl<http://www.vrt.nl>

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Received on Tue Oct 09 14:54:54 2012