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Messages - jrandy

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1
The Shape Shack / Re: Build a Vacuum System to Dry Boards
« on: May 11, 2019, 05:00:59 AM »
No good reason for acetone around EPS and epoxy.
-Acetone eats/melts/wrecks EPS
-Acetone is linked to epoxy allergies as part of the delivery mechanism

2
The Shape Shack / Re: foil sup deck reinforcing
« on: May 11, 2019, 04:46:52 AM »
I would say a layer of 200g carbon between 200g glass would be pretty good especially if the carbon patch is big enough to catch the geometry of the sides of the 'pan' instead of just a small patch underfoot. My experience is also more flat water.

I suppose the scientific thing would be to make test panels and test them for weight and stiffness afterwards:

a. 2x200g glass
b. glass-carbon-glass
c. glass-coremat-glass
d. glass-veneer-glass

Please post up what you decide and some more shots of the board, it looks like a fun shape!

3
Late to this party for sure...
-grind laps are awesome on fiberglass cloth
-grind laps are miserable on carbon fiber (imagine black dust everywhere messing up the next hot coat)
-I generally do not conceal installs done with HD foam as they show an extra level of detail in the build.

4
The Shape Shack / Re: Shape3Dx tutorial and discussion
« on: April 19, 2019, 07:09:52 AM »
MW, is there an 'Elements' drop down on your screen?

5
Training, Diet, and Fitness / Re: shoulder surgery went great
« on: January 18, 2019, 01:22:39 PM »
RTG- glad you are in good spirits post-op.

What kind of exam or imaging do they do to determine need for that kind of surgery?
I have a 'friend' who hurt their shoulder but is chicken to go to the doctor...

6
The Shape Shack / Re: EPS Breather layer....Pono jrandy?
« on: January 12, 2019, 10:45:33 AM »
I have never tried. It would be interesting to hear if it works.
I end up with thin sheets every time I hot-wire cut a blank from block EPS.
I do remember someone (Mataco) posting up EPS+PVC builds where they prebent the PVC with a heat gun to aid in vac bagging.
https://www.standupzone.com/forum/index.php/topic,27457.0.html
Let us know how it goes!


7
The Shape Shack / Re: Build a Vacuum System to Dry Boards
« on: January 10, 2019, 03:52:12 AM »
'Loving the report Beasho.
I would avoid 'cooking' anything EPS above 140F. I read a upper limit of 160 F before the foam (not solid PS) compromises but I cannot find it to quote.  There are also tales of woe on the interweb of boards left in hot cars, etc. that would support the notion damaging heat is not really that 'hot'...

8
The Shape Shack / Re: Build a Vacuum System to Dry Boards
« on: December 23, 2018, 03:00:25 PM »
The standard vac bag layup:

core, glass, resin, perf ply OR peel ply, breather matt, bagging film with edges sealed with mastic.

Peel ply (silicone treated nylon) soaks up extra resin and creates a re-bondable surface. Perf ply (plastic with small holes) only bleeds a little resin from the laminate into the breather.

The breather matt is not 100% crushable so there is room for air flow out of the bag through the pump.

-Beasho, your choice of on-hand materials was pretty good short of buying from a composites store.-

I have a thread called 'a little vaccum bagging' that might help:

https://www.standupzone.com/forum/index.php/topic,32181.msg359640.html#msg359640


9
The Shape Shack / Re: Build a Vacuum System to Dry Boards
« on: December 12, 2018, 09:23:22 AM »
Comments about glass jar are heard. I guess I was making the assumption that if they can be boiled and sealed and cooled that they have enough snot for this application. The koozie may not be enough...

10
The Shape Shack / Re: Build a Vacuum System to Dry Boards
« on: December 12, 2018, 09:14:17 AM »
Beasho, that is an impressive pump. Careful with that capacitor...

From the picture of my rig earlier in thread:

Suck side:
pump
pipe nipple
t-fitting with gauge off one arm
pipe nipple, valve (useless for me in retrospect, skip this line...)
hose barb
tubing
hose barb w/ backing nut
trap lid and jar (mason type jar and 1 piece lid from bbq sauce+ beer koozie impact protection)
hose barb w/ backing nut
tubing
hose barb
vacuum disconnect (super sweet for vacuum bagging projects, beats taping in a mustard jar nozzle)
project

Blow side:
pump
pipe nipple
muffler

11
Foil SUP / Re: Foil Share File Share
« on: December 09, 2018, 06:35:09 AM »
Here is a set of 4" side fins (flat insides) fins I did using a open-source software chain for the design.

They were featured in a tweet from finFoil showing multiple technologies to make the same fin. The tweet has a short URL lthat is a link to my process and a discussion of the foiling software.

https://twitter.com/finfoil/status/837384551466954755

Thanks to Admin for allowing us to attach design-type files on the 'Zone!


12
Foil SUP / Re: 3-D printed foils.
« on: December 08, 2018, 11:55:42 AM »
Awesome, thanks Admin.

Specific extensions recognized by Shape3D:

.s3d and .s3dx (Shape3D, the 'x' one is the current format)
.brd (Aku, BoardCAD)
.srf (SurfCAD)
.phb (Precision)
.kms (KMS3200)

13
Foil SUP / Re: 3-D printed foils.
« on: December 08, 2018, 05:39:44 AM »
How big are the files?

A small fin STL file would be 300KB
A finbox STL file 600KB
A large dihedral foil 4.5 MB STL file per side

Please list the file extensions that are used.  Is it limited to .stl or are there others?

Hi Admin-

I appreciate you looking into this.

For STL files the .stl extention is prevalent and most every front end for 3D printing takes them. There are other mesh files but i do not use them.

If you wanted to allow people to exchange actual surfboard/SUP files (small file sizes 2-10 KB) then you would need .brd , .s3d*  and .pdb to cover programs like AKU, BoardCAD, Shape3D (there are 3 or 4 file types all starting .s3d... ), and Precision Shaper.

Sharing CAD files rather than STL usually results in smaller file sizes, especially for larger parts like a wing or mast or fuselage...but also a larger list of file extensions.  In my workaday world the most common are STEP (.stp or .step) for 3D and DWG and DXF (.dwg and .dxf) for 2D.  Most CAD programs have the ability to generate something like STEP or DXF that is more 'neutral' than its native format.

The list would get very long including every possible mesh or CAD format.  But I think the ones above would easily cover the majority.

If someone sees a hole in these lists please post up.

The nice thing about sharing board and CAD files is that the end user can make modifications easily. Edits to STL files are possible but more time consuming and less repeatable aka 'artsy' in my opinion.

14
Foil SUP / Re: 3-D printed foils.
« on: December 07, 2018, 06:40:20 PM »
How big are the files?

A small fin STL file would be 300KB
A finbox STL file 600KB
A large dihedral foil 4.5 MB STL file per side

15
The Shape Shack / Re: Build a Vacuum System to Dry Boards
« on: December 04, 2018, 07:51:02 AM »
I have avoided 'those' type of pumps aka super good deals after hearing that they spit oil while they work.

I found a 40$ Gast at a surplus store it has been working well for me.


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