I'm hopping on the flexvat bandwagon

Various topics related to Vat design, construction and coatings.
HTL
Posts: 101
Joined: Thu Feb 06, 2014 3:19 pm
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Re: I'm hopping on the flexvat bandwagon

Postby HTL » Mon Jan 05, 2015 11:08 am

The vat design allows the fep to be under very high tension so that sagging is not an issue (If you tap the FEP on my vat it sounds like a pretty good high frequency drum). See: http://projectsinterestsandetcetera.com ... oing-work/

.005"/.127mm fep is a very tough material that can be highly tensioned without worrying about it splitting or being punctured.

sodium
Posts: 159
Joined: Thu Jan 01, 2015 2:56 pm

Re: I'm hopping on the flexvat bandwagon

Postby sodium » Mon Jan 05, 2015 11:38 am

With the flexvat, tilt is needed at all? u tilt your vat ? one more question. in your last print u show a big chunck of "something!"; is hollowed or solid?

Thanks in advance!

HTL
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Re: I'm hopping on the flexvat bandwagon

Postby HTL » Mon Jan 05, 2015 12:11 pm

The tilt is not strictly neccessary but I'm going to keep it because it makes the beginning of the peel easier (picture suction cup vs zipper) and I tend to print parts with large flat area that I do not want to print tilted (printing tilted can distort a part). The peeling action on my printer is generally not even noticeable even on large parts.

The part is hollow and translucent. What you see is the inside of the part showing supports and some resin that I did not clean out that hardened during the post cure. Also, the part is one half of a 2 part master for a silicone mold.

crusoe
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Re: I'm hopping on the flexvat bandwagon

Postby crusoe » Wed Jan 07, 2015 6:06 pm

Fantastic! Whats the white top/rim part of the vat made from? Custom machined, or repurposed part?

HTL
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Re: I'm hopping on the flexvat bandwagon

Postby HTL » Wed Jan 07, 2015 8:08 pm

The top piece was machined out of a 3/4" thick piece of hdpe on my cnc router. I made it out of hdpe because it's what I had around in that thickness at the time. There is a bead of silicone that acts to seal it to the piece below.

HTL
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Re: I'm hopping on the flexvat bandwagon

Postby HTL » Thu Feb 12, 2015 11:35 am

I mentioned in an earlier post that I was going to try to find a torque wrench or driver for tightening down the FEP tensioning bolts on my vat. Several weeks ago I found a torque driver that works perfectly for tensioning the FEP, it allows me to get back to my working tension quickly and it insures that the tension is even across the FEP when I change it.

shown with socket
Image

It is internally adjustable: you pick the wax plug out of the end of the driver, use the hex key to adjust it to the torque you want and leave it there.

If anyone can use one this is where I got mine:
http://www.ebay.com/itm/Sturtevant-Internally-Adjustable-Torque-Screwdriver-PM15-810064-/141571240952?pt=LH_DefaultDomain_0&hash=item20f64db3f8

these are the specs:
Sturtevant pm-15 (pm15)
3-15 in. lbs. / 0.33-1.65 Nm / 3.44-17.2

HTL

hegykc
Posts: 75
Joined: Fri Jan 30, 2015 2:54 pm

Re: I'm hopping on the flexvat bandwagon

Postby hegykc » Fri Feb 13, 2015 7:36 pm

Hi HLT, I guess you're the one I got my fep films from just the other day :)

What a great service you're doing here. I am hopping on that flexvat build immediately.

Here's a wild idea. Why not tension 2 of the bolts with a 30% less/more torque, so that they offer more/less flex to the FEP on one side, so that the peeling always starts there. That would give you the tilting affect without the tilt mechanism?

Also, what about a digital torque adapter, so you can experiment with different highly precise torques:

http://www.ebay.com/itm/BikeMaster-Digi ... 6b&vxp=mtr

EDIT: yeah that digital torque won't work without some hefty springs under the bolts. It's rated from 40 Nm upwards. Torque screwdriver it is then.

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odino
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Joined: Sat Dec 13, 2014 8:44 am

Re: I'm hopping on the flexvat bandwagon

Postby odino » Fri Mar 20, 2015 8:33 am

Wow...
your vat design is handsome!

If only I found that before drop the bottom-up desing for the top-down method...

What's the size of you plate?
Have you intention to try large plate (200x200mm)?

Congratulations!
Great Work man!