Flex bottom VAT

Various topics related to Vat design, construction and coatings.
chemstar
Posts: 27
Joined: Sun Jun 01, 2014 4:24 am

Re: Flex bottom VAT

Postby chemstar » Thu Oct 09, 2014 8:16 am

Yeah direct from cs Hyde just checked out with a credit card

I got the 0.005in thick 24inch by a foot size

No adhesive which in hind sight was a mistake I think,

More description of these flex vats would be good.

But I'll see when I get the film
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dangre
Posts: 116
Joined: Wed Jun 25, 2014 4:20 pm
Location: SW Michigan

Re: Flex bottom VAT

Postby dangre » Thu Oct 09, 2014 12:05 pm

Here is my version on a mUVe DLP. It is a work in progress so don't look to close. The first pic is the lower portion showing the acrylic tension walls. The second is the complete assembly with the 0.005" FEP pulled down taught. I think a tension system is a must. I'm still playing with exposures as they are too high at the moment (16s). I removed a PC sheet I was using for protection but that didn't seem to help much. I have to look at my projector settings next. Once I have the exposure set correctly I have had no issue with sticking to the FEP. This FEP sheet has seen about 25 parts and has a few scratches from poor cleaning procedures.
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Dan - mUVe 1 DLP

chemstar
Posts: 27
Joined: Sun Jun 01, 2014 4:24 am

Re: Flex bottom VAT

Postby chemstar » Fri Oct 10, 2014 9:11 am

im going to give this vat a try looks nice and easy

watch the you tube vid

viewtopic.php?f=9&t=2044

16sec on exposure time seems a bit hight iv only done one failed print (due to crappy vat) but it seemed to be good around 3s

RapApp
Posts: 11
Joined: Sun Jul 06, 2014 9:07 am

Re: Flex bottom VAT

Postby RapApp » Fri Oct 10, 2014 10:27 am

My Vat ist now also working. I have Stresstest it and Print a lot of Objects on the same film with out of negativ results.


http://dlprint3d.blogspot.de

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Excited4DLP
Posts: 22
Joined: Wed May 14, 2014 10:40 pm

Re: Flex bottom VAT

Postby Excited4DLP » Wed Oct 15, 2014 6:52 pm

General Question - If I place a thin piece of polycarbonate (say about 0.03") underneath the FEP film with a gap in between both (say about 7mm) will the image deflect from the thin 0.03" thick polycarbonate sheet causing image distortion on the FEP film?

PacManFan - Is your thin layer of polycarbonate directly underneath your FEP film or is there a gap between the poly and the FEP? Also, what thickness of polycarbonate are you using?

Finhead - Was your 0.02" polycarbonate silicone layer a thin solid sheet or was it more flimsy? If it was a solid sheet where did you buy it from? I've been told by a supplier that 0.02" would be film-like whereas 0.03" would be a solid sheet.

Dangre: Did you figure out why your exposure times (16s) were so high and have you remedied the situation?

chemstar
Posts: 27
Joined: Sun Jun 01, 2014 4:24 am

Re: Flex bottom VAT

Postby chemstar » Thu Oct 16, 2014 8:39 am

Excited4DLP wrote:General Question - If I place a thin piece of polycarbonate (say about 0.03") underneath the FEP film with a gap in between both (say about 7mm) will the image deflect from the thin 0.03" thick polycarbonate sheet causing image distortion on the FEP film?

PacManFan - Is your thin layer of polycarbonate directly underneath your FEP film or is there a gap between the poly and the FEP? Also, what thickness of polycarbonate are you using?

Finhead - Was your 0.02" polycarbonate silicone layer a thin solid sheet or was it more flimsy? If it was a solid sheet where did you buy it from? I've been told by a supplier that 0.02" would be film-like whereas 0.03" would be a solid sheet.

Dangre: Did you figure out why your exposure times (16s) were so high and have you remedied the situation?



im curious to know as well

if a thin sheet of poly was place under the fep film wouldn't that remove the sagging issue?

would there be issues if the fep film was resting on the polycarbonate sheet but not stuck to it??

Phife
Posts: 239
Joined: Fri Jan 17, 2014 5:24 pm

Re: Flex bottom VAT

Postby Phife » Thu Oct 16, 2014 10:05 am

the FEP film will tend to adhere itself to any smooth surface its resting on, so if you had a non adhesive backed FEP film resting on some polycarb sheet it would essentially become bonded with the polycarb.

chemstar
Posts: 27
Joined: Sun Jun 01, 2014 4:24 am

Re: Flex bottom VAT

Postby chemstar » Thu Oct 16, 2014 10:24 am

thanks phife i will give it a go, im hanging for this fep film to turn up

getting 50+ prints out of a vat is need to make bottom up sla printing viable in the long term

who knows 10 years from now resin could be $10 a litre and everyone would be building top down :?:

dangre
Posts: 116
Joined: Wed Jun 25, 2014 4:20 pm
Location: SW Michigan

Re: Flex bottom VAT

Postby dangre » Fri Oct 17, 2014 3:23 pm

Excited4DLP wrote:
Dangre: Did you figure out why your exposure times (16s) were so high and have you remedied the situation?


Unfortunately, I haven't figured this one out yet. I've tried different settings on my ViewSonic PJD7820HD but still 16s. This is way too long for big parts as the resin and FEP heats up too much. I'm thinking it is my FEP from McMaster. I am all ears from all of you using tensioned FEP on what source works, what exposure time, and what thickness.
Dan - mUVe 1 DLP

hp_
Posts: 301
Joined: Tue Dec 24, 2013 10:25 am

Re: Flex bottom VAT

Postby hp_ » Fri Oct 17, 2014 4:00 pm

hi dangre what size is your build plate?
we can send you a flexvat for sure :)

hp