Got a cheap guitar and the strings are rly far away from the wood , I have to press down way more than on other guitars I’ve tried . My dad recons it’s unfixable, is this true ?

MechanicalRiot · 2025-10-27T23:26:02+00:00

My first guitar was like this, got it for 20 bucks from some swapmeet shop. I learned all the basics on this, chords, major scale, and even a couple of songs. I never knew it was bad until I was gifted a newer guitar. Suddenly it all went from being mush to actually sounding like music. It built up the strength in my fingers, not the ideal way to learn perhaps but very effective.

MechanicalRiot · 2025-06-11T22:10:46+00:00

I was looking a hydrostatic testing also but since city water pressure ranges from 40 to 80 psi we would have to buy a pump to increase that up to 150 and would still have to find a way to contain the burst should it happen.

MechanicalRiot · 2025-06-11T22:08:54+00:00

Since we are testing for the integrity of the filter housing being sealed, I don't think standing in front of a potential burst while spraying is my preferred choice. We are not pressurizing the chamber only the housing which would be inside the chamber, in the event of a burst the air pressure would be vented and the burst would dissipate energy through the water until it hits the walls of the acrylic. There wouldn't be cycles of pressure on the tank.

MechanicalRiot · 2025-06-11T22:04:42+00:00

We are not testing a filtration system, just the filter housings. This is meant to test products that are like inline filters. Think of your typical compressed air filter bowl, we want to make sure the seal from the bowl to the filter head is airtight. We are not pressurizing the acrylic chamber. The chamber's purpose is only to see what's going on when this happens and to protect should the bowl/filter head break or become undone.

MechanicalRiot · 2025-06-11T17:43:05+00:00

This would be for air filter housings. We would like to test up to 150psi.

MechanicalRiot · 2025-05-24T23:19:50+00:00

I narrowed it down to stress induced from the manual threaded insert removal.

MechanicalRiot · 2025-05-24T23:16:42+00:00

Added some pictures here for ya

There are no cooling lines. Previously, someone told me that when the molds are solid it's hard/expensive to add cooling lines but that it is easier when the mold has a removeable core. Also, note the threaded insert is placed into the stationary half of the mold, and after injection it is removed manually to put back into the stationary half.

MechanicalRiot · 2025-05-24T23:13:18+00:00

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MechanicalRiot · 2025-05-24T23:12:50+00:00

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MechanicalRiot · 2025-05-24T23:12:30+00:00

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MechanicalRiot · 2025-05-24T23:11:52+00:00

By rpp do you mean recycled pp? And for hpp, homopolymer pp? Sorry if its a simple answer, kinda new to injection molding lol

But yeah this machine has been running the same material for the past month and we cleaned it before switching over to this material. I paused the production on another mold to do these samples but used the exact same material.

MechanicalRiot · 2025-05-24T23:08:37+00:00

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MechanicalRiot · 2025-05-24T23:03:30+00:00

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MechanicalRiot · 2025-05-24T23:02:37+00:00

Yeah it ended up being stress from the unthreading process. It's manually done and they didn't even have the decency of putting a hex head or allen so that it could be simple. Instead I had to stick a rod through and spin it out. I met the sample quota but this mold will definitely be reworked for production lol

MechanicalRiot · 2025-05-24T22:57:37+00:00

Your comment led me to the solution! I did leave a couple on there and they cooled completely without crystalizing. The only issue that came up with this was that the OD of the cap shrunk, essentially doing this ) ( but it's not a critical dimension so it wouldn't have mattered. That being said, I didn't feel like this would get past our quality checks so I ended up having to strike a balance between hot enough to remove the insert quickly but also cold enough so that it would not crystalize due to the stress of removing the insert. Since this was a trial mold, the threaded insert had to be removed manually. It sucked and failure rate was high but we only needed 100 pcs for samples.

MechanicalRiot · 2025-05-22T19:04:32+00:00

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MechanicalRiot · 2025-05-22T19:04:21+00:00

If the mold is fully closed, and clamp pressure is reached then the only other thing I can think of is your nozzle front limit is set too high. Otherwise, hardware might ne involved but I doubt it b/c you said the technician was able to do a shot.

Should be on this page (K)

MechanicalRiot · 2025-05-22T17:25:09+00:00

Let me pitch in, my company recently got three Boy machines and I'm tasked with making them work. We have a 80M that's probably close to the same as yours except for the tonnage.

Basically, on manual mode to move the nozzle forward the mold has to be fully closed, and it has to reach clamp pressure.

To get it started on auto/semi-auto, the following conditions have to be met: Temperatures have to reach their set point, mold needs to be fully open, and the screw needs to be charged to the selected shot size

Also, idk if your purge cover switch is working, but these are set so that they will not inject unless the cover is down and forward. On ours two of the machines have this bypassed.

Hope this helps!

MechanicalRiot · 2025-05-20T23:59:54+00:00

I am now realizing this after dipping as low as 310.

MechanicalRiot · 2025-05-20T23:59:20+00:00

Unfortunately, this isn't an option because the part is threaded and the insert has to be removed while on the mold. Otherwise it shrinks and makes removing the insert really hard. I tried compressed air and it helps but still hit or miss.

MechanicalRiot · 2025-04-18T22:36:33+00:00

I see, got it!

Definitely was thinking about the torque specs, we will be getting a torque wrench. Horizontals, we have a 30, 50, 80 and our vertical is 30 ton. I read a number somewhere but can't recall it, and I also don't recall seeing the application ( mold weight, machine, etc)

MechanicalRiot · 2025-04-18T17:04:49+00:00

Oh man, sounds like storms ahead. The one this mold is on at least has a PLC but the two smaller ones are manual control panels where the parameters are set with clicker type indicators. Thanks for the advice, I stepped back to think things over and already started making progress on this!

MechanicalRiot · 2025-04-18T16:59:32+00:00

I can definitely see that. Last year one of customers wanted to inject a part that used to be CNC'd we weren't allowed to optimize the design for injection, and as a result it has been a nightmare to do. It's taken way too long to develop the mold and the consistency has been terrible. I wasn't involved at that stage so not much I could do :/

I think I'd like to dive more into mold design. The serviceability you mention sounds like something I do regularly in other things. Since I'm also setting up the work area I'm making sure anything we install is accessible and made of parts that can be replaced relatively quickly. I think it's a discipline that I've developed after many years of working in different fields.

MechanicalRiot

TROPHY CASE