Adding a pressure gauge to a hydraulic jack
Messy
shop project. Idea copied off
one of my pyro mentor’s website.
Picked a 12 ton press
off craigslist, first thing I had to do was add a
pressure gauge.
First thing, drain the
fluid and tear it down. Wearing latex gloves and getting hydraulic fluid
everywhere is a good reason not to touch the digital camera for this phase of
the operation, but just picture the mess and then triple it!
After thoroughly cleaning the base, the setup begins:
Drill a 3/16 hole
about 1-1/2” in, centering in the meat of the base, on the side opposite the
rest of the ports.
then open the hole up to 5/16 for the first ¾”.
Then run a 1/8” pipe thread tap in.
Clamp the base flat,
connect the dots:
Now clean ‘er again, and reassemble, (where did those little parts
go?) making note of the diameter of the piston base.
I used a hydraulic “Z”
fitting, only rated up to 6000 PSI, probably re-plumb at a later date for full
pressure. Anyway, passed the pressure test (the second time around)
Reason
for measuring the piston diameter, to make a conversion
for hydraulic pressure to lbs of force. Piston dia
= 1.75 inches, giving me an area of a bit
over 2.40 sq inches. At 6000 PSI gauge
the force would equal about 14,400 lbs. to test my math, at 10,000 psi it figures to 24,053 lbs, probably not a coincidence it’s
a 12 ton jack. Now it's time to figure out how to get hydraulic fluid out of my hair.
|
Pressure conversion
chart |
||||
|
|
Piston Dia |
1.75 |
||
|
|
Piston area |
2.4053 |
||
|
416 |
PSI |
= |
1000 |
LBS |
|
624 |
PSI |
= |
1500 |
LBS |
|
832 |
PSI |
= |
2000 |
LBS |
|
1039 |
PSI |
= |
2500 |
LBS |
|
1247 |
PSI |
= |
3000 |
LBS |
|
1455 |
PSI |
= |
3500 |
LBS |
|
1663 |
PSI |
= |
4000 |
LBS |
|
1871 |
PSI |
= |
4500 |
LBS |
|
2079 |
PSI |
= |
5000 |
LBS |
|
2287 |
PSI |
= |
5500 |
LBS |
|
2495 |
PSI |
= |
6000 |
LBS |
|
2702 |
PSI |
= |
6500 |
LBS |
|
2910 |
PSI |
= |
7000 |
LBS |
|
3118 |
PSI |
= |
7500 |
LBS |
|
3326 |
PSI |
= |
8000 |
LBS |
|
3534 |
PSI |
= |
8500 |
LBS |
|
3742 |
PSI |
= |
9000 |
LBS |
|
3950 |
PSI |
= |
9500 |
LBS |
|
4158 |
PSI |
= |
10000 |
LBS |
|
4365 |
PSI |
= |
10500 |
LBS |
|
4573 |
PSI |
= |
11000 |
LBS |
|
4781 |
PSI |
= |
11500 |
LBS |
|
4989 |
PSI |
= |
12000 |
LBS |
|
5197 |
PSI |
= |
12500 |
LBS |
|
5405 |
PSI |
= |
13000 |
LBS |
|
5613 |
PSI |
= |
13500 |
LBS |
|
5821 |
PSI |
= |
14000 |
LBS |
|
6028 |
PSI |
= |
14500 |
LBS |
|
6236 |
PSI |
= |
15000 |
LBS |
|
Pressure conversion
chart |
||||
|
|
Piston Dia |
1.75 |
||
|
|
Piston area |
2.4053 |
||
|
|
|
|
|
|
|
500 |
PSI |
= |
1203 |
LBS |
|
1000 |
PSI |
= |
2405 |
LBS |
|
1500 |
PSI |
= |
3608 |
LBS |
|
2000 |
PSI |
= |
4811 |
LBS |
|
2500 |
PSI |
= |
6013 |
LBS |
|
3000 |
PSI |
= |
7216 |
LBS |
|
3500 |
PSI |
= |
8418 |
LBS |
|
4000 |
PSI |
= |
9621 |
LBS |
|
4500 |
PSI |
= |
10824 |
LBS |
|
5000 |
PSI |
= |
12026 |
LBS |
|
5500 |
PSI |
= |
13229 |
LBS |
|
6000 |
PSI |
= |
14432 |
LBS |
|
6500 |
PSI |
= |
15634 |
LBS |
|
7000 |
PSI |
= |
16837 |
LBS |
|
7500 |
PSI |
= |
18040 |
LBS |
|
8000 |
PSI |
= |
19242 |
LBS |
|
8500 |
PSI |
= |
20445 |
LBS |
|
9000 |
PSI |
= |
21648 |
LBS |
|
9500 |
PSI |
= |
22850 |
LBS |
|
10000 |
PSI |
= |
24053 |
LBS |
|
|
|
|
|
|