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Post by ninworks on Jun 2, 2022 5:39:54 GMT -5
I used to be very good at mathematics in general. I never had any training beyond algebra and geometry but having worked in a machine shop for 30 years I learned how to do some basic calculus and trigonometry out of necessity.
I need to rebuild the hydraulic jack on my press and the nut on the top is huge (well over 3") and I don't have a wrench large enough to loosen it. I decided I'll just get some steel and make one. That was going to require some geometry to layout a hexagon on the material that would fit the large nut. All I had is the measurement across the flat sides of the nut. Could I remember how to calculate the angles and such to layout a hexagon when I only had one dimension? Geese! The basic answer is no. It's been too long and that stuff had completely left my brain but once I saw the formula it came back to me. I knew it involved right triangles but couldn't remember how to solve for the A side when all I had was the B measurement. I remembered the Pythagorean Theorem but couldn't remember the correct way to do the other calculations but I found it. The internet is a wonderful thing for stuff like that. I felt like an idiot for not remembering how to do it.
How's yur rithmuttik skillz?
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Post by Larry Madsen on Jun 2, 2022 7:00:36 GMT -5
My calculation on that might begin at "channelLocks".
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Post by walshb 🦒 on Jun 2, 2022 7:26:04 GMT -5
At one time, many years ago, I had a job as an NC programmer, and I had to solve right angle triangles all day long to determine the X and Y coordinates. I had a calculator and a little cheat sheet with the formulas to figure sine, cosine etc., that I used every day.
Without the cheat sheet, I'd probably be lost now.
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Post by Peegoo 🏁 on Jun 2, 2022 7:41:31 GMT -5
I would've measured across the points of the nut for a diameter, drawn a circle on the steel, and drilled six small holes at each corner to establish the hex shape. Then I would botch the machining and end up going to Homeless Despot and buying a cheepo adjustable spud wrench from the plumbing department  Click Here! I've used a pipe wrench in the past to rebuild those bottle jacks. |
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Post by Laker on Jun 2, 2022 7:48:01 GMT -5
I spent some time as a machinist on cammed and CNC automatic screw machines and as a manufacturing engineer designing tooling and test-fixtures/gaging for that type of manufacturing so used trig, algebra and geometry quite a bit. Back in the ‘70s I used a Hewlett-Packard HP-35 calculator (still have it) that made calculating stuff pretty easy.
When I moved into quality assurance I used the math skills when programming coordinate measuring machines.
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Post by modbus on Jun 2, 2022 8:00:03 GMT -5
If it were me, I'd weld a 8" piece of rebar to a flat on the nut, and use that to take the nut off and put it back on.*
*that is, of course, if you have the clearance.
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Post by hushnel on Jun 2, 2022 8:19:05 GMT -5
If I had to make it with what I have, I’d of just focus on the parallel flats.
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Post by slacker 🐨 on Jun 2, 2022 9:02:44 GMT -5
I don't use that stuff much, but I'm amazed at how much comes back to me when I need it. Geometry, trig and Algebra all get used periodically for me...usually on my personal projects.
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Post by ninworks on Jun 2, 2022 9:18:50 GMT -5
I would've measured across the points of the nut for a diameter, drawn a circle on the steel, and drilled six small holes at each corner to establish the hex shape. Then I would botch the machining and end up going to Homeless Despot and buying a cheepo adjustable spud wrench from the plumbing department  Click Here! I've used a pipe wrench in the past to rebuild those bottle jacks. I have a big pair of channel lock pliers that fit but it was too tight for that. I'm going to need something I can hit with a hammer to loosen the nut. It needs to be jarred to get it moving. |
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Post by Laker on Jun 2, 2022 11:35:35 GMT -5
I would've measured across the points of the nut for a diameter, drawn a circle on the steel, and drilled six small holes at each corner to establish the hex shape. Then I would botch the machining and end up going to Homeless Despot and buying a cheepo adjustable spud wrench from the plumbing department Click Here! I've used a pipe wrench in the past to rebuild those bottle jacks. I have a big pair of channel lock pliers that fit but it was too tight for that. I'm going to need something I can hit with a hammer to loosen the nut. It needs to be jarred to get it moving. How about borrowing a chain pipe wrench? |
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Post by markfromhawaii on Jun 2, 2022 12:48:26 GMT -5
Back in college and then studying up for the EIT and PE exams for my engineering license I had to learn and work problems on differential equations, Fourier and Laplace transforms and such. All necessary to obtain the license but not practical for my particular line of work. I ended up working in controls mostly and the most important equation was the point-slope equation. The application was to determine whether sensors were linear during calibration. It also came in handy to interpolate and extrapolate linear data sets. Engineers like things linear with only one or two variables and few variations.
Edited to add that I used PID (proportional, integral, derivative) controllers from time to time. There were rules of thumbs on setting the parameters and also software to tune the controllers. As I recall tuning at one load condition (example, full occupancy) didn’t guarantee stability at another (example, partial occupancy).
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Post by Peegoo 🏁 on Jun 2, 2022 13:03:42 GMT -5
I would've measured across the points of the nut for a diameter, drawn a circle on the steel, and drilled six small holes at each corner to establish the hex shape. Then I would botch the machining and end up going to Homeless Despot and buying a cheepo adjustable spud wrench from the plumbing department Click Here! I've used a pipe wrench in the past to rebuild those bottle jacks. I have a big pair of channel lock pliers that fit but it was too tight for that. I'm going to need something I can hit with a hammer to loosen the nut. It needs to be jarred to get it moving. If you decide you need heat to help pop it loose, WARNING WARNING empty the jack of hydraulic oil and leave the filler plug out. If you don't do this before firing up the torch, you'll have a potential bomb right in your face. One of these (even a small one) bursting can blow your head clean off. |
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Post by ninworks on Jun 2, 2022 17:47:06 GMT -5
I won't use heat unless all other efforts fail which I don't expect them to. The way it has been leaking oil the threads should be far past well lubricated. I think it just needs a fast impact to break it loose. The wrench I'm going to make will give me that capability.
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Post by larryguitar54 on Jun 2, 2022 18:04:58 GMT -5
Long time ago when I first got a sailboat and did some coastal and offshore navigation I learned enough to get by. With a compass and speed log and a couple markers you can triangulate your position. With time you learn shortcuts with any increment of 15 degrees and work out simple solutions.
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Post by revtones on Jun 3, 2022 11:07:57 GMT -5
Remove the fluid,open the filler. Secure the jack. Pipe wrench and a dead blow. Done a hundred of em'. 10 minutes.
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Post by zoikzz on Jun 3, 2022 17:05:42 GMT -5
big butt pipe wrench may need ext. bar. Rebar is soft poop.
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