cariboo skis

Document your personal work here. Show photos, movies, and share your secrets.

Moderators: Head Monkey, kelvin, bigKam, skidesmond, chrismp

Post Reply
skibumben
Posts: 12
Joined: Sat Jan 02, 2021 9:17 am

cariboo skis

Post by skibumben »

Hi all,

Ive been lurking a long time on this board! I started a ski building project 5 or 6 years ago, and never got it finished due to house and work things. fast forward to now, over christmas i unpacked the crate it was all boxed up in, and decided to setup and finally try to finish.
Im using the shape i had cutout and made templates for at the beginning, everyday ski, 105mm waist aprox 18m radius, 184cm long, rocker tip and tail. the cores are douglas fir (harvested off our local ski hill!) and maple. The plan is to vacuum bag for a press as i already had a suitable unit from doing A/C repair. Basic sandwich construction, 22oz fiberglass top and bottom of the core, no spacers or sidewalls, and a clear topsheet. The plan is to vacuum to teh sheet of 14ga steel, pressing the sandwich of the ski together, and then use spacers clamped underneath to form camber and the tip and tail rise. the steel seems sturdy enough to form a nice smooth radius when clamped against a block.
Attachments
211D70A5-AE28-4E5E-AC87-0EA1074728FA_1_105_c.jpeg
211D70A5-AE28-4E5E-AC87-0EA1074728FA_1_105_c.jpeg (253.07 KiB) Viewed 3067 times
88B98B1E-A55E-4757-9BE4-DB7DEA9D6FCF_1_105_c.jpeg
88B98B1E-A55E-4757-9BE4-DB7DEA9D6FCF_1_105_c.jpeg (215.46 KiB) Viewed 3067 times
6B416F1A-F077-4FBE-864E-B9EBB6FA7F6B_1_105_c.jpeg
6B416F1A-F077-4FBE-864E-B9EBB6FA7F6B_1_105_c.jpeg (252.08 KiB) Viewed 3067 times
A67B5E8B-905D-466A-B971-A15A08E32722_1_105_c.jpeg
A67B5E8B-905D-466A-B971-A15A08E32722_1_105_c.jpeg (248.5 KiB) Viewed 3067 times
skibumben
Posts: 12
Joined: Sat Jan 02, 2021 9:17 am

Re: cariboo skis

Post by skibumben »

spent some time in the shop last night getting ready to press. plumbing my vacuum pump to work for pressing skis. does anybody use a resin trap on the line leaving the bag? or is epoxy getting pulled up and throught the pump usually a non issue?
TimW
Posts: 48
Joined: Sun Apr 26, 2020 11:56 am

Re: cariboo skis

Post by TimW »

Definitely use a resin trap. If you really want to do without it, make sure to use a long hose to at least get some buffer.

It also serves as a vacuum vessel. I normally shutdown my pump(but you need to be absolutely airtight for that.
skibumben
Posts: 12
Joined: Sat Jan 02, 2021 9:17 am

Re: cariboo skis

Post by skibumben »

tried a test press last night using a scraps of base, core and topsheet.
was havving trouble pulling a hard vacuum. wondering what people typically expect for vacuum levels when bagging? when doing a/c work i usually get 25-30 in/hg. i seem to max out a 18 in/hg last night.
Attachments
8CC36033-2B3D-4DF2-8728-3D5B30CBD868_1_105_c.jpeg
8CC36033-2B3D-4DF2-8728-3D5B30CBD868_1_105_c.jpeg (193.5 KiB) Viewed 2971 times
01E6ACA3-F5D1-4297-98DE-B8294B30E19E_1_105_c.jpeg
01E6ACA3-F5D1-4297-98DE-B8294B30E19E_1_105_c.jpeg (314.18 KiB) Viewed 2971 times
skibumben
Posts: 12
Joined: Sat Jan 02, 2021 9:17 am

Re: cariboo skis

Post by skibumben »

despite the problems with my vacuum bag, my test piece turned out looking like a section of ski. kindof exciting.
Attachments
E5088CF5-A01B-4B35-8F38-888AB7D2EF69_1_105_c.jpeg
E5088CF5-A01B-4B35-8F38-888AB7D2EF69_1_105_c.jpeg (199.91 KiB) Viewed 2959 times
7D8BB804-BD92-4932-BAE0-E3B472B807FD_1_105_c.jpeg
7D8BB804-BD92-4932-BAE0-E3B472B807FD_1_105_c.jpeg (192.48 KiB) Viewed 2959 times
4A1CD360-FF33-4A79-A3F6-E808BF8F958E_1_105_c.jpeg
4A1CD360-FF33-4A79-A3F6-E808BF8F958E_1_105_c.jpeg (275.9 KiB) Viewed 2959 times
342BEFE9-573E-46EA-8EAB-D87DBE2D5382_1_105_c.jpeg
342BEFE9-573E-46EA-8EAB-D87DBE2D5382_1_105_c.jpeg (145.18 KiB) Viewed 2959 times
TimW
Posts: 48
Joined: Sun Apr 26, 2020 11:56 am

Re: cariboo skis

Post by TimW »

You should be leak tight, so if your pump can do 30", you should get 30". If you have a leak you have air flowing, and that may go through your laminate, messing it up. Sometimes you keep having a small leak, but any leakage is tricky.

Are you using tacky tape? I see a lot of packing tape. It is almost impossible to a proper seal with packing tape.
skibumben
Posts: 12
Joined: Sat Jan 02, 2021 9:17 am

Re: cariboo skis

Post by skibumben »

yeah, i was being a cheapskate. i have a roll of the right stuff coming. so lets hope thats the issue!
sammer
Posts: 933
Joined: Wed Dec 19, 2007 10:37 pm
Location: Fernie B.C.
Contact:

Re: cariboo skis

Post by sammer »

I'm at around 3000' elevation and have a very similar vac pump (old robinair).
I pull around 24"hg even with a small leak thru the glue joints on my press frame.
You will do better once you get some proper sealing tape and a decent film.
I used 6mil vapour barrier for my first few builds with the yellow sealing "tape". Worked good, but had to work out how to pleat the corners as, it didn't have the stretch to get around my tip and tail molds.

Your laminate looks pretty dry. Use a bit more epoxy and a J-roller to squeeze out the excess once it is in the bag, under vacuum.
You'll need to have a place to push the excess to.
Your film will try to keep it all trapped if you don't put in some type of exit where the film caps over the edge of the laminate.

sam
You don't even have a legit signature, nothing to reveal who you are and what you do...

Best of luck to you. (uneva)
Post Reply