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How to Convert a Harbor Freight Pressure Pot for Resin Casting

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In this video, I am converting a Harbor Freight pressure pot for resin casting. I have become interested in resin casting recently and wanted to make a pressure pot to end up with clear casting for my wood turnings. Just one more video to help you make your own. I think mind may be the easiest and cheapest conversion yet of this popular product. Enjoy!
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WYNNsky 1/4" Heavy Duty Brass Ball Valve Shut Off Switch, 1/4 Inch Male And Female NPT Thread Pipe Fitting: amzn.to/37HYjzb
Milton S-1094-4 1/4" FNPT Full Port Brass Ball Valve: amzn.to/2DncCvh
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Turning stuff
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Some of my favorite tools I use all the time.
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Camera equipment used in this video
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PANASONIC LUMIX G VARIO LENS, 14-140MM, F3.5-5.6 ASPH: amzn.to/2K1dFnC
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NICEYRIG Rosette Wooden Handle Grip (Left Side): amzn.to/32Pvu1m
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Canon EF 24-70mm f/2.8L II USM Standard Zoom Lens: amzn.to/2SBsReO
Music By Bensound.com
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6 сен 2024

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Комментарии : 56

@jatna77 4 года назад

Did you ever fix the sealing problem?

@MadNerdWorkshop 4 года назад

Yes I did, I actually followed Franklin Keeley advice (another reply) and covered the seal with a thin film of vasoline and that stopped the leaking.

@axl19902 4 года назад

@@MadNerdWorkshop anyway you can show us exactly how? Im losing psi still

@73cruiser 4 года назад

Alex Lopez try flipping the seal and use white lithium grease between the seal and the pot

@axl19902 4 года назад

@@73cruiser ill definitely give that a try

@MadNerdWorkshop 4 года назад

@@73cruiser That is a great Idea Randy D.

@acraftsmansimagination56 3 года назад

Just tried out the vasoline trick and it works great! I had to play with everything for about an hour before I got it to hold pressure but it works good now. Just doing one last test before I try it on resin!

@MadNerdWorkshop 3 года назад

It worked well for me, and it is still holding pressure today without any issues.

@willowbrook8917 4 года назад

You could have used the regulator to keep the pressure at 40 psi. That is what a regulator does, it maintains pressure down stream. Leave the air compressor connected so that it can make up air as needed.

@MadNerdWorkshop 4 года назад

Good point WillowBrook, here is my thinking on this and why I decided to do it this way. The regulator that comes with this pot has four outlets on it and I wasn’t sure if all three-exit outlets are regulated. One or two of the outlets will need to be plugged. So, on that one regulator you have four possible areas for leaks (not including the regulator itself). If I left it on to make up air as needed, I need to have it attached to my air compressor, which already has a regular on it. I just set the regulator on my compressor at 50psi and it will maintain 42psi in the tank. It does the same thing with less fixture to buy and less pluming on top of the tank. Franklin Keeley suggestion of using Vaseline on the seal, really solve any leaking problems. Since I did that, I can pump in 45psi and close off the valve and disconnect the tank. After sitting there overnight it only lost 1 pound of pressure.

@willowbrook8917 4 года назад

@@MadNerdWorkshop Very good. Just FYI a regulator will have one port that is the input for the line air and an output for the controlled air, or regulated air. 1/4" pipe threads are a very common size for these ports but regulators are made in many different sizes. The other two ports on the sides are for the guage. The reason for two ports for the guage is it gives you options of where the guage can be located. The unused port would be plugged. 1/8" pipe threads are very common for the gauge ports but again they are made in all sizes. The gauge ports and the output port will all have the same PSI. Another bit of information I will share, there is a sealer you can buy just for pneumatic plumbing intead of using teflon tape. Teflon is a lubricant not a sealant. I spent 40 years desighing and building manufacturing machines which included large pneumatic systems. Air leaks can be a challenge but they all can be stopped.

@MadNerdWorkshop 4 года назад

@@willowbrook8917 That is very good information WillowBrook, I pinned this to the top so others can see it. Thanks for sharing.

@newretrorockets 2 года назад

The regulator it comes with works as you need it to, it just has an extra outlet you need to plug up. You connect your compressor hose to it at 90psi or whatever and set the pressure to 40psi at the tank. The gauge on the regulator tells you how much pressure is in the tank. Then you can leave the hose connected the whole time and it will maintain 40psi and compensate for the slow leak. Mine leaks like a SIV though which is what brought me here. I guess Ill have to try to slather it with vaseline...even though I already tried the white lithium grease with no luck.

@MadNerdWorkshop 2 года назад

It did not take much Vaseline for mine to seal. Make sure it is all really clean before applying the Vaseline.

@all4freedom100 Год назад

The issue is, the air bubbles aren’t “escaping.” That would be a vacuum chamber. You are compressing the bubbles with a pressure pot.

@MadNerdWorkshop Год назад

That is correct, I misspoke on that one.

@seoultron4581 2 года назад

Easiest conversion out of all the videos I watched. Only needed 3 fittings. You also need a 1/4" female to female coupling for the 3/8 reducer and gauge connection. I think he put another valve in the parts list by accident instead of that

@MadNerdWorkshop 2 года назад

Thanks Seoultron.

@mvecellio1 3 года назад

A good way to fix your problem is to coat the sealing ring with vaseline. Worked for me.

@MadNerdWorkshop 3 года назад

That is very true mvecellio, that is what I did and now I have little to no air leak (that I can tell). Thanks for sharing your fix mvecellio, take care.

@gregjohnson8486 Год назад

Thanks for sharing.👍🏾I've wanted to do this for awhile but am concerned about the leaking. Every video I've seen has said the tank WILL leak. And the leak is almost always the lid and not the taped fittings. Would replacing the gasket or using a bead of 100% silicone or FlexSeal work to stop the leaking I wonder?

@MadNerdWorkshop Год назад

you know Greg, someone said to use Vaseline on it, I used it once, and I’ve had a very very small leak since then. It would lose about 2 pounds of pressure overnight. That’s all.

@jmangus83 3 года назад

I wonder if you could use valve grinding compound and some dykem between the lid and tank to create an airtight seal

@MadNerdWorkshop 3 года назад

I would think that would help. The valve grinding compound would smooth out the metal, I never used Dykem so I am not sure how that would help.

@jmangus83 3 года назад

@@MadNerdWorkshop the dykem just shows when you have an even contact ring all the way around the rim

@mountainviewturning5319 4 года назад

Very nice wanting to get on them harbor freight

@MadNerdWorkshop 4 года назад

It does work well.

@tomzahlman1156 3 года назад

Thank you for the video

@MadNerdWorkshop 3 года назад

You're welcome and thanks for watching.

@MrBAMAREDNECK 3 года назад

Can you use galvanized fittings instead of brass??

@MadNerdWorkshop 3 года назад

I don't see why not, But I am by no means an expert on that. Double check with google to make sure the air pressure will not affect the galvanized fittings. I have no problem finding brass, so that is the ones I use. Thanks for watching.

@hiawies 3 года назад

if the compressor is 2.5 H.P, is that okay? Because i’ve heard the minimum requirement for air compressor is 3.5 H.P.

@MadNerdWorkshop 3 года назад

Yes Shazwi, a 2.5 H.P. compressor will work just fine. My compressor is only 1.8 H.P. The H.P. doesn't really matter, what matter is getting at least 40 psi to the tank. My small portable pancake compressor is also able to do that. Thanks for watching.

@hiawies 3 года назад

Mad Nerd Workshop thank you!

@ichiku9856 3 года назад

Thank you very much. I learned alot.

@MadNerdWorkshop 3 года назад

I am glad it was helpful! Thanks for watching ichi ku

@soaresyguitars1992 4 года назад

Hi from, Mike. Thank you for your post on the converting the pressure tank to a casting pot - I was wondering what your thoughts are about doing the same thing - But adding some extra valves - And fittings - To make it into a - Vacuum as well - So one could Vacuum first - Then switch to Pressure to finish - Isolating each gauge with a ball valve - And maybe the Safety valve as well ?? - Vacuum for 2 Min. - Then switch to Presser - Then let the casting sit over night - What do you think - Thank You - Mike.

@MadNerdWorkshop 4 года назад

You know Mike, that may be a rather cool idea. The only issue I see, is there is no way to watch the vacuum part of the process and you may get some bubble over into the tank. You could check the progress when switching over from vacuum to pressure to see if the level of the resin is not too low. All in all that is a very interesting idea Mike. If you do it, let me know how it worked. Thanks for watching.

@soaresyguitars1992 4 года назад

@@MadNerdWorkshop Hi from, Mike. Thank You - I am just starting out with this kind of stuff - So far about $300.00 Invested - With no great castings yet - But have some great Silicone molds - I buy plastic containers at the dollar store that fit into my pot - About 10” X 4 “ - And place my molds in to them - So that any spill over or bubbling goes in the container - Not my pot - I only have the Vacuum pot at this time - I have the Presser pot - But not all the fittings yet - But what I was thinking of would be to use the 2 Holes on the top of the pot - 1 For presser - The other for Vacuum - Stating with a ball valve for each right out of the top - So one could isolate each one - Then have a manifold on each valve as needed to set up each one as needed with a in and out valve as well - And using a container to hold any spill over - But I did put an extra well on each of my molds to handle this - What I do not know yet is if the presser pot will work with soft silicone molds ?? - What I am looking to do is this - Make Tortoise shell guitar knobs - No one make a good one - They are just amber knobs with a shot of brown in them - I think I have it figured out ?? - I have not tried it yet - But will try 5 Different colored plastic beads - From, clear , amber , yellow , butter scotch , too brown - crush them up - and mix them into the molds - Then try a Translucent tinted Amber pour - As well as a dark Coffee pour - I will try to fill the mold first with the crushed beads - Then the tinted pour - Then mix it up in the mold - Then pot it - The other thought is to add some of the pour first - Roll it around and then add the crushed beads - And then re pour to fill - And Pot - But right now we are most likely looking at March - Thank You - Mike.

@michaelwhalen83 3 года назад

@@soaresyguitars1992 silcone molds are flexible so if there's is are any air bubbles at all in the silicone, the mold will get compressed and misshapen when you put it in the pressure pot. If you degassed your silicone in your vacuum pot before casting your molds you should be ok. When casting with resin, the vacuum pot is best for degassing resin before you pour it in a mold in my experience. I haven't seen anyone use a vacuum pot with the resin in its mold, but I've wondered if it works. Hows it working out for?

@soaresyguitars1992 3 года назад

@@michaelwhalen83 Hi from, Mike. OK. Thank You - I ditched the presser pot - And just gas vacuum my molds when I make them - Then I the rosin rest till all the bubble are gone - Then do poor with no problem - Thank You - Mike.

@rbarbour64 3 года назад

I made my vacuum chamber from a pressure canner.

@MadNerdWorkshop 3 года назад

I need to get a vacuum chamber, thanks for watching Robert.

@ernestsaenz6193 4 года назад

You're using the locking pliers and adjustable open end wrench incorrectly. The need to be flipped over to safely operate them. This is especially true if you need to apply a large amount of force.

@ernestsaenz6193 4 года назад

"They" need to be flipped.. I fat fingered the keypad..

@MadNerdWorkshop 4 года назад

That is true Ernest, but I am not applying large amount of force on them and I am only using them for the leverage they offer.

@MadNerdWorkshop 4 года назад

@@ernestsaenz6193 I knew what you were referring to, and I will make sure I use them correctly next time, Thanks for watching Ernest.

@adamaquatic6205 3 года назад

I believe you listed the wrong fitting. 3/8ths to 1/4 reducer doesn’t fit my HF pressure pot. Also, in the future, please don’t link every single tool in your shop as well as things you didn’t even use.

@MadNerdWorkshop 3 года назад

Sorry Adam, that was the one that fit my set-up. HF could have changed the fitting size to fit a new regulator. That is the only thing I can think of. I will try to cut out some of my tools on future videos. Thanks for watching.

@The_Conqueeftador 3 года назад

This video and other videos show these guys using blue teflon tape which is only rated for water. You should be using yellow or red threading teflon tape. Damn irresponsible, This guy however is smarter than the others and did switch up to red for other threads but never explained why. I do chuckle while other videos on this subject have the guys wondering why their brass pieces are hissing at the end of some of these conversion videos. P.S. total cost for brass, valve, tank and cheap wal-mart air compressor cost me around $173.00 rounded up.

@MadNerdWorkshop 3 года назад

Thanks Randon, it was actually while making this tank that I found out about the other tape for air. I like to do a little research before starting on a project like this one and this time it was good that I did. Take care and thanks for watching.