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Skateboard Press - Any Suggestions?

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yoinigo
Posted: Tue May 30, 2006 1:48 pm Reply with quote
Joined: 24 May 2006 Posts: 7
i want to know could i use a 12 ton press just to make 1 board at a time, and if not could i use a 20 ton to make one two or what ever also i'm new to making skateboards i only did one when i was 8 and it was a 2 by 4 cut out with trucks on it and sry for hijackin the topic
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Everide
Posted: Tue May 30, 2006 8:47 pm Reply with quote
Joined: 16 Apr 2006 Posts: 81 Location: MidWest
Thanks Skinny,

I saw that pump. They must be using that to run both those presses. I was also thinking that they are probably using something like a log splitting hydraullic since they have such a big gap inbetween there molds.

I talked with a guy today about a pump, he said he has one available that will automatically re adjust itself to keep pressure so it doesn't have to constantly run. He said it was around $1900. It was 1/2 hp with 5000 psi.

Seems like quite a bit. I've seen used electric over hydraulic with twice as much power for $600. But they didn't have that handy little option.

JAZ
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Everide
Posted: Thu Jun 01, 2006 8:28 pm Reply with quote
Joined: 16 Apr 2006 Posts: 81 Location: MidWest
ok, I had a change of plans. I spoke to a hydraulic specialist and he said the best way to set up a press that holds the right amount of pressure and is solid is to utilize a standard industrial pump like a small pressure compensated axial piston pump, an accumulator, and a pressure switch, and an off the shelf cylinder that will produce the force with about three thousand pounds of oil pressure.

I have a few questions/verfications if some of you have answers:

How long do you hold the skateboards in the press? I've heard anywhere from 45 min to 2 hours.

How much pressure per square inch? I understand that it should be 200 lbs of pressure per square inch.

How many boards is it safe to stack. I read that 3-4 should be max, anything more than that and the form doesn't take as good of shape.

Thanks,

Josh
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skinny
Posted: Sat Jun 03, 2006 2:18 am Reply with quote
Joined: 12 Sep 2004 Posts: 2706
Your in the right psi range. Technically 150-250 more and you will crack veneer.

Try 2 decks at first.....
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pennswood
Posted: Sat Jun 03, 2006 4:51 pm Reply with quote
Joined: 14 Sep 2003 Posts: 213
enerpac hydraulics.
10000 psi system
50 ton cylinder.
the foot pump has a built in regulator and resevoir
get a lockout valve.

pump up to full pressure,
close the valve.
do not open for 1-2 hours.
it will hold the pressure as long as you have no leaks.
you can put a pressure gauge on the inside of the lockout valve,
and check that the pressure remains.

or get 2- 20 ton bottle jacks,
pump them up to full pressure.

it all works.
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skinny
Posted: Sat Jun 03, 2006 8:06 pm Reply with quote
Joined: 12 Sep 2004 Posts: 2706
pennswood wrote:
enerpac hydraulics.
10000 psi system
50 ton cylinder.
the foot pump has a built in regulator and resevoir
get a lockout valve.

pump up to full pressure,
close the valve.
do not open for 1-2 hours.
it will hold the pressure as long as you have no leaks.
you can put a pressure gauge on the inside of the lockout valve,
and check that the pressure remains.

or get 2- 20 ton bottle jacks,
pump them up to full pressure.

it all works.



Joe barely posts on here, but when he does they are always good....

This is the info you were looking for, as I said before I don't use hydraulics.
The one caution I would state is the pressure leaks. When I tried it out, I switched because I did want to dig up the ram, and other components. I dropped the idea and developed another method.
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skinny
Posted: Sat Jun 03, 2006 8:12 pm Reply with quote
Joined: 12 Sep 2004 Posts: 2706
http://www.harborfreight.com/cpi/ctaf...?Itemnumber=92038
http://www.harborfreight.com/cpi/ctaf...?Itemnumber=93436
http://www.harborfreight.com/cpi/ctaf...?Itemnumber=46169
http://www.harborfreight.com/cpi/ctaf...?Itemnumber=32746
http://www.harborfreight.com/cpi/ctaf...f?Itemnumber=3189
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Everide
Posted: Sat Jun 03, 2006 10:17 pm Reply with quote
Joined: 16 Apr 2006 Posts: 81 Location: MidWest
Hey Joe,

Thanks for the advice. I was looking into an enerpac 50 ton a few days ago but I didn't purchase it because a guy out west offered to put a package together for what I need........just have to see if the price is right.

Do you have any suggestions for a 10,000 psi system?

Thanks for the links Skinny.....I was having a bit of trouble finding a pump like those. The only ones I seemed to find were the portable ones. Looks like good prices too.

Josh
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skinny
Posted: Sat Jun 03, 2006 11:34 pm Reply with quote
Joined: 12 Sep 2004 Posts: 2706
http://www.jackxchange.com/products/RC-50.cfm
Maybe 2 of these? RC-251 25 Ton 6" Stroke Cylinder $355.30
One of these:
http://www.jackxchange.com/products/G2509L.cfm
One of these with a four way valve:
http://www.jackxchange.com/products/PUJ-1200B.cfm

You would have a sick little set up.
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pennswood
Posted: Sun Jun 04, 2006 12:26 pm Reply with quote
Joined: 14 Sep 2003 Posts: 213
pump is air to hydraulic.
http://www.jackxchange.com/products/PAT-1102N.cfm
500 bills and can power up to 5 presses with 2- 25 ton cylinders
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