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I have a Jet HP35A 35-Ton shop press. Works great except the gauge keeps creeping up. It never returns to zero when done. At present it reads 12 tons when it should read zero. It's been slowing climbing over the years. Is there a way to repair the gauge or do I need to replace it?I looked up the part in the manual (HP35A-23B) and Jet wants $269 for the gauge.I'm certain I can put a standard hydraulic gauge on there and with some math figure out how many tons is on the cylinder based on the bore diameter. I believe the bore is 6". At 2500 psi the cylinder would be pushing 70,000 lbs. That sounds like the right range. I really prefer a stock style gauge in tons. Does anyone know where I can source a gauge with a scale in tons?
Reply:I've read somewhere that people were taking an off the shelf gauge and printing their own face for it.My name's not Jim....
Reply:Originally Posted by BoostinjdmI've read somewhere that people were taking an off the shelf gauge and printing their own face for it.
Reply:write on the face with a sharpee maybeDynasty 200DXPassport plus w/ spoolmate 100victor 315c oxy/(act and prop)Miller digital elitemilwaukee power tools
Reply:Hi forhire, I took a look at the jet manual and couldn't find any system pressures.I'll take a guess that the bore is near 6" as you think (from the parts breakdown in the owner manual, last page). What you worry about is if the relief circuit in the press gets messed up. If you go over design pressure things start to break.If you have a hydraulic repair and hose shop close they can tell you what psi series yours has, and you can go from there.All my Enerpac, OTC and Porto-Power are 10,000psi (old style stuff) and when I need one I just get a 10,000psi guage. These things can really work a guage to death when they load/break over and over.(edit) If you go out and look for used or surplus, the oil filled guages look and feel nice but they are not intended for this type of systemMattLast edited by Matt_Maguire; 12-30-2010 at 07:20 AM.
Reply:Originally Posted by forhireI looked up the part in the manual (HP35A-23B) and Jet wants $269 for the gauge.
Reply:I have fabricated meter scales utilizing AutoCad and transparency film. I dont know if it is still availble or if new copiers are capable of printing on the film. When was the last time you saw someone use an overhead projector???
Reply:Can you not take it to a high pressure gauge repair shop and have it tested and re-calibrated?Lincoln SP-170 MigHypertherm powermax 45Lorch T220 AC/DC TigButters FM 215 synergic MigKemppi 180 adaptive mig RULES ARE FOR THE OBEDIENCE OF FOOLS AND THE GUIDANCE OF WISE MEN.
Reply:You can't simply rewrite your own scale on a gauge that's inaccurate! It's like adding / subtracting time from a clock that's running slow due to low batteries, it'll ALWAYS be inaccurate regardless of where you write your 'new numbers'. The calibration is set to be where the tube is bent inside referenced to zero. If the tube is broken and pre-bent the zero cannot be accurately reset because it wasn't made that way.Have it fixed right or replace it. A gauge doesn't care what it's hooked up to as long as the pressure range is correct and the system is compatible with the internals. Getting a liquid-filled gauge won't really add much benefit to you as they are intended for needle vibration dampening- which you won't have. Jet might require a metric thread, just be wary of that. Otherwise any gauge will do.Is the scale in 'tons' really relevant to you, or are you just curious how much force you are putting on things to move them. I'd think the latter is correct?We want to see something like this in the signature line:Lincoln Ranger 250Miller Auto-Darkening Elite HelmetLincoln 100Lincoln MigMiller Spectrum 375Craftsman 8 galllon gas powered compressorLongevity 200amp Tig Welder LT-200D
Reply:Thanks everyone for all the ideas. Originally Posted by turkwrite on the face with a sharpee maybe
Reply:Originally Posted by Stack of DimesYou can't simply rewrite your own scale on a gauge that's inaccurate!
Reply:Originally Posted by AndyAI'm also curious why an oil-filled gauge wouldn't be an improvement. I would have bought an oil-filled as a replacement thinking the damping of the oil might help the gauge better survive rapid pressure changes.
Reply:Originally Posted by AndyAI think the suggestion was to relabel a new psi scale guage to read out pounds of force from the cylinder.I'm also curious why an oil-filled gauge wouldn't be an improvement. I would have bought an oil-filled as a replacement thinking the damping of the oil might help the gauge better survive rapid pressure changes.
Reply:Who needs a gauge?Gaugeless press pressure guide:2 tons - Press bed settles to contact at all points.4 tons - Pump motor settles into a heavy drone.5 tons - Oil film no longer visible as ram is being wiped clean by pressurized seal.10 tons - Slight crazing of work-piece's paint becomes noticeable.15 tons - Pump motor slows to a healthy growl.20 tons - Coworkers stop production to observe press operation.30 tons - Dog leaves press area.40 tons - Coworkers cower partially behind nearest heavy object.50 tons - Push tool begins a slight deformation at contact point.60 tons - Pump motor emits a slight squealing sound.70 tons - Coworkers no longer visible. 80 tons - Coworker cautiously extends arm while wielding video camera. 90 tons - Workpiece support's surface mill scale begins to deform.100 tons - Workpiece seems to have vanished in sonic flight. 90 tons - Press leaps from floor. 80 tons - Vulgar obscenity slowly uttered by an observing coworker. 50 tons - Heavy laughter from other coworkers. 25 tons - Dog joins in with playful bark. 20 tons - Press crashes back to floor. 15 tons - Second echoing sound, seemingly an "aftershock" emits from office area. 10 tons - Press bed lands with a third crash. 5 tons - Wall-plaster dust begins to permeate shop. 1 ton - Enraged Boss Man exits office with workpiece in hand. 0 ton - Workpiece picks up second sonic flight, aimed directly towards press operator. Pieces seem no further separated than at 2-ton start.Last edited by denrep; 12-30-2010 at 08:06 PM.
Reply:denrep, that is great! LMAO! I've been one of the co'workers hiding around the corner and shaking my head."I don't think that's a good idea, lumpy." "Seriously. Let it off man." "BANG!"
Reply:There are a few pressure points where the operator's involuntary self-preservation reflexes can be observed, but those vary from operator to operator and thus are difficult to pinpoint. Last edited by denrep; 12-30-2010 at 08:07 PM.
Reply:Originally Posted by Matt_MaguireThen when the intermal spring is trying to pull the needle back - the oil in the guage acts the same as if you had your finger on the needle keeping it from moving.
Reply:That sux forhire,Maybe if they designed the press to use that guage it has some internal accumulator/dampener in the hyd. circuit? So it may just be a fluke.Matt
Reply:Originally Posted by denrepWho needs a gauge?Gaugeless press pressure guide:2 tons - Press bed settles to contact at all points.4 tons - Pump motor settles into a heavy drone.(snip)40 tons - Coworkers cower partially behind nearest heavy object.(snip) 90 tons - Press leaps from floor.(snip) 0 ton - Workpiece picks up second sonic flight, aimed directly towards press operator. Pieces seem no further separated than at 2-ton start.
Reply:I finally replaced the gauge on the press. My original order directly thru JET was cancelled for some reason and I didn't bother re-ordering. A few weeks ago I had to order some other parts for the press and decided to replace the gauge. I ended up getting the parts through ereplacementparts.com as their price was the same as JET without all the handling and shipping fees. The new gauge is working great. Hopefully the gauge will last a long time. Attached Images |
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发表于 2021-8-31 22:11:55