From A Two-Piece Silicone Mold! Part 2
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- čas přidán 26. 07. 2024
- It’s easy to make clean resin castings when you have a perfect silicone rubber mold.
This video is part 2 of this earlier video:
• Silicone Mold Making: ...
SKIP AHEAD TO THE GOOD PARTS:
00:00 Casting a resin part in a 2-part silicone rubber mold.
00:21 Orienting the mold in space so that it will fill properly.
00:58 Why not inject the resin into the mold?
03:12 Trimming the mold to avoid slight deformation by the mold case.
04:19 Building the mold cradle.
06:22 Cutting the cradle parts on the tablesaw.
08:32 Some bandsaw cuts and assembling the cradle.
10:21 Fitting the rubber bands.
11:50 Trimming the rubber mold so that it fits easily into the pressure pot.
14:55 How much resin will I need to make the casting? Weighing the model.
16:00 Weighing out the urethane resin. Mixing the A and B sides.
18:21 Pouring the resin into the mold.
18:53 Dropping the mold into the pressure pot.
19:55 Taking the mold out of the tank. A little bit spilled but it’s OK.
21:00 Remember, you can check your witness cup to see if the resin is cured.
21:13 Time to open the mold.
21:57 A slight problem: I failed to cut completely through the rubber bridge in the spout.
23:00 Problem solved; the casting comes out and it’s perfect!
24:29 Trimming the sprue and vent on the bandsaw.
25:14 It’s easy if you trim your sprues immediately after the parties demolded.
25:53 Very little flash for a 2-piece mold. Super clean parting lines!
26:15 Great result, I couldn’t be happier! Thanks for watching! - Jak na to + styl
Here is a link to a downloadable PDF file with a list of the rubber, resins and waxes I use in my videos:
www.dropbox.com/s/kz6mhmf7v5vpy7l/Material%20and%20Suppliers.pdf?dl=0
Hi Robert,
Do you recommend any good chemical or UV resistant resins?
I have a small run production I would like to try this with but the finished plastic/resin parts needs to be chemical and UV resistant.
Many thanks.
This guy is like the Bob Ross of resin casting
I just posted that on last video. Funny!
@@tomo4635 To me he's a bit of Bob Ross, and a bit of AvE.
@@dimman77 a good combo.
nah thats the crafsman, he is the bob ross of resin
i think cap'n mike is closer to Bob...
I have made tons of two part molds, watched tons of videos on how to do it from many who claim to be casting professionals. None have ever come remotely close to the quality of this two part video. Well done, my hats off to you.
Thanks for watching and commenting. I appreciate it.
Robert Tolone, the best thing I have discovered during lockdown, thank you.
Thanks so much for your nice comment Valerie.
Aww that scale made me so nostalgic for high school, I completely forgot we used those. We had electron microscopes and old school scales lol
love to see some more two-piece molds in the future. learned a lot from this one
Pretty sure there will be more 2-piece molds in the future!
Thank you for educating everyone about how the material flows into the mold without force! Long ago, I use to create 3D mold designs for plastic mold injection for large manufacturers. Everything you said is spot on.
I just can't thank you enough for sharing your work, I love seeing this stuff, the bizarre and interesting things these molds produce is just wonderful. I love what artists come up with, and mold making is a big part of making their art shine. Thank you so much for sharing this process with us.
On par, excellent quality craftsmanship, "no-bull" advice, and signature humor. Love it!!!
Thanks Ricky!
Great info, I decided to have a crack at molding some stuff. Then thought i better have a little look around on here before just going for it with no experience. This is really helpful. Good video, thank you
I’ve made two part molds for complex shapes where a single mold just won’t do. I’m happy to say that I must be doing something right because you did everything I would do. Thanks!
You are a wonderful teacher. I need to go back and start watching all your videos from early to later. When I get to casting, I want to know what I'm doing. Thank you so much for sharing your knowledge.
Thanks for watching and for your nice comment!
When you explain pouring resin in, I take it as the same principal as air being pushed out of a cylinder in an engine. The exhaust valve is the vent, the intake is the pour. The piston is the resin pushing up on the air.
Good to see you back amongst the pressure pots you look right at home now .
For 3 happy days I was back in my shop. A friend has offered me garage space as a temporary shop so I’m getting set up here.
@@RobertTolone sorry to hear it's taking you a lot longer with things happening away . Will wait till next week to see the new set up . Stay safe .
He always has the vibe I love
Thankyou for taking the time to share your hard-won experience with the world!
Excellent job. As one mold maker to another, there's nothing more satisfying than completion of a good project.
I've been casting for a couple decades and you are 100% correct about injection. I have worked on castings that have to be injected, because they are aerospace parts and need to be done through a mixing tip for a certain time, etc. to meet spec. These parts always have more bubbles, despite the fact the resin is guaranteed to be free of air due to coming from a cartridge. The reason for this is injection fills the mold too quickly. Air gets trapped in corners and against walls as the resin flows over it without having time to wet it out. To counter this we would overfill molds until resin squirted out of the vents. The logic was it would wash the bubbles out with the resin flow. It works, but not that well, and the resin we used was about 300 bucks a liter. The ONLY reason for this is repeatability and standardization, at least in aerospace That is more valuable than a hundred bucks of resin waste. There was also the advantage you could use a resin with a 30 second pot life and a 5 minute demold, but we had no need for that level of speed and generally ran a 3 minute pot life resin.
In short, pour your resin. Don't inject it.
Thanks for the channel. I"m learning a lot despite being an old hand at this.
You Sir are a rare breed on youtube! a mature American that knows what he is on about. You’re a delight to listen too thanks very much for a great informative video.
Thanks! i appreciate you for watching and for your nice comment.
Robert, I started resin casting about 5 years ago, and mold making and casting was hit or miss. Almost all my molds are two part molds since I am casting miniature buildings, and to save on resin we are casting them hollow. Up until I watch this video series, I was gluing the master to the base of my mold box and then hot gluing the outside edge of my mold case. I use legos to make my mold case. Clamping the mold box to the bottom plate is brilliant. Thanks for sharing your knowledge and experience
Thanks Paul! I’m happy you found my video helpful.
Grand master at work. Skill and technical knowledge is shockingly galaxies apart. He deserves a Nobel prize
in 3 of your videos, I have learned more than in years of watching videos and searching the internet for information.
I’m so happy you find them helpful!
Dear Robert. Like so many happy accidents I came by you channel by chance looking to cast an acrylic case for my granddaughter’s boom box. Several hours later and now silly o’clock I was caught up in your charming presentation style, insight and profound knowledge thank you. I really did understand when to use release agent and when not to..
Glad you found my channel!
im glad to find someone else who wacks their scales with sticks because yes, it does help weigh out things better. Don't ask us why! it is science.
Just a side note for people who like to know things. Injection molded plastic is pushed into the mold around 700 psi. The mold clamp only needs to be enough to keep the mold together. Basically about 700 pounds for every square inch of surface area of your part plus 5 or 10 percent in case of any pressure deviation in the process.
I agree with your assessment of injection vs pour casting. Love your videos!
I love this channel
Thanks for watching Robert!
This is by far THE best and most professional two-part video to cover this critical subject I have ever seen on youtube. and believe me when I say that I have watched thousands if not tens of thousands of them so far. hats off!
Sir, I really really really can't thank you enough for caring to share your brilliant ideas, unique approach, and your unparalleled experience with us :)
Thank you Basem for your very kind comments. I’m delighted you found my videos helpful.
Fun trivia: that lipped edge on the cast rubber is the meniscus, just like when water has a meniscus in a container.
The most informative and entertaining info on this subject ever! Thank you
Thanks for the nice comment Claude!
@@RobertTolone check fb, sent you a pm
Robert, I absolutely love your channel! Thank you so much for sharing your experience! So much to learn...
Glad you enjoy it! I appreciate your comment!
It was a pleasure to see this project getting finished. ^^ Thanks, Robert.
Thanks Roger!
New to your channel and you already helped my molds get a little better!
Great job, and good to see you back in the workshop.
For 3 precious days I was home to gather tools and bring them here. I’m setting up a temporary shop in a friend’s garage. Will luck I’ll be fully up and running in a couple weeks.
Watched both parts. Great job. Ya got my sub. The info is going to help me on my next pour.
My silicon is a bit firmer. I am trying to cast the plastic interior of Hot Wheels cars with lead to add weight.
I have had success but now I see I need a better set-up as to not deform the rubber.
Thanks so much. It was nice watching. A little long, but very informative.
You are awesome Sir! fun to watch, smart and informational. I love how you offer advice and points of view.
Just starting to get interested in making molds & casting and this video was incredibly helpful in understanding the entire process. Very well done.
Glad you found it helpful Bruce!
Another great video Robert, love all the insider tips and tricks. I was surprised to see how straight and flat that part turned out, I would not have thought that possible with "floppy" silicone mold.
It really came out nice. It was a heavy, thick mold in a cradle so it had a good chance of making clean castings.
Impressive! Thank you for sharing your knowledge 😊
Thanks for your videos. I learned very much how to make my silicone and resin projects.
That's a great job!
It was a great lesson for me!
Thank you~!
Great channel, loads of advice in a paced, well explained manner. You are a great teacher.
I appreciate your nice comment Steve. Thanks for watching!
I love this guy xD
One of my favorite youtubers!
Unbelievable... So perfect a casting... Amazing... Congratulations...
Brilliant!
I have watched a few of your videos and love them. I will be watching more of them. love your personality and your instructions are awesome.
Thanks for watching!
Thank you for these videos, you explain things very well!
Excellent as always. I like the 45 degree angle idea. I’m going to try that on my rubber tire mold to see if that helps. I have a vacuum chamber, however, I see a pressure pot in my future.
I love my pressure pots.
That was amazing! Can't wait to watch more of your videos, I am going to try to save some for tomorrow lol.
Glad you enjoyed it Ian. Thanks for watching!
Well i thought you were experimenting and turns out you are experienced expert in these matters. Awesome
REALLY making me nervous the way you're casually holding your hands that close to a still-engaged tablesaw.
+ kickback alert!
Me to !!!
Glad to see you are back in the shop. I hope everyone is well in your family. I’m so happy the part came out perfectly! You are the man. Email me with the details of the transaction.
Jeff
I was home for 3 days; just long enough to cast your base and do the video. It was a great project. It looked so simple but it had a number of challenges to deal with. Like a dummy I left your project in the studio and it will be a couple weeks before I get back there. The material bill will be quite minimal because the base was small. I’ll let you know and get everything back to you as soon as I can. Thanks so much for your patience Jeff, I really appreciate you sending me this project.
Great advice thanks!
Fantastic. I am glad I found your channel. I had to subscribe. Looking forward to many more projects.
I'm glad you found my channel!
perfect,- once again,- great fun to watch
Thanks Wolli!
A true master of mold making.
Thanks Genie!
The long awaited video!!!
I was so looking forward to casting in that mold! It really came out super nice.
Love watching your videos
Glad you like them Korey!
Great job and info thanks
You rock bro. Love it.
I love the old school logic approach..great info.
Try to keep it simple, right Paul?
except maybe for the silicone "rubber" label. Makes me think of grandma who still "tapes" her shows. lol. Good channel.
Wish everyone stay safe. I do sculpture in Vietnam 🇻🇳 😍😍😍😍
very nice job
this is genius!
cool ..this is a fun channel. Thanks.. lovin'the vids
Thanks Alexander!
love the lackey grooves, fool proof.
you're a goddamn genius man, thanks for sharing!
Your videos are so informative. Wondering how I would go about creating a mold for a custom card deck case.
Perfect 👍
Lol - love how you tell it how it is! “If you think there is a difference... you are wrong.....” I am not sure why but that still has me laughing. Have a good one!
I’m glad you think it’s funny. Most people use words like obnoxious, opinionated, overbearing, etc! I should have added, “prove me wrong - change my mind” because I really do enjoy learning new tricks.
Wow what a craftsman impressed of England
Thanks Rowan!
Very informative thank you
Thanks Mimi!
I live in the south blocking atmospheric moisture is inevitable, but I like your trick. I will certainly try it next time.
It’s not perfect, but it helps. I live near the ocean so our humidity is very high too.
Incredible information, you are a natural teacher. Thanks for this video, part 1 too. btw, I'll need to look up if you've got a video on that "tank" .. i.e. pressure tank. Maybe that isn't super ultra necessary for a beginner but maybe later down the road.
pressure pot videos:
czcams.com/video/Aro-CkdI6O0/video.html
czcams.com/video/lnSh7lMzAv8/video.html
Robert you deserve to have a million subscribers with millions of views
Yes I do! 🙏🙏😄
Real perfectionist.
perfection is a strange thing. It’s a total illusion, but it has the power either to drive you forward or stop you in your tracks.
Sir, you are adorable. Thank you for your content!
thanks man. you are amazing
Thanks Osman!
I know this was a year ago but I would like to suggest that maybe you get a small run out table and learn to finish pushing your pieces you're cutting on your table saw all the way through. I noticed that in some cases you hesitate as you're pushing for a split second. It really is just enough time for the blade to grab the part and kick back. Unfortunately, I am speaking from experience. I would just hate for something bad to happen. Somewhat of a new viewer and big fan of the channel. This is definitely a very light suggestion :)
Maestro, that's who you are.
welcome back
Thanks Jerry. I was only home for 3 days to pick up tools. I’m setting up a temporary shop here in a friend’s garage.
You Sir, are a joy. Great video as always.
I appreciate that you watch my videos. Thanks for the very nice comment!
Mortal Kombat voice "Flawless victory!!!"
joyous
I have been wanting to make 2 part molds, to pour resin 1/25 scale model car bodies. Anyway you could do a video on that?
Would you kindly get a final series of still shots showing the casting from all angles, all in perfect focus, and showing both the top and the bottom, so we can marvel over your amazing work. I felt a little unsatisfied at the end because we never had clean images of the results. Thank you, and love your videos.
Great idea, I will do that from now on!
Quote of the video for this week: "... a funky, dunky, warpy box..." LOL!!! Love it! You have the greatest sayings, Robert! QUESTION: Do you find that the good ol' razor blade and/or Exacto Knife are plenty quick and offer you better control when cleaning-up a casting, then say, a hand-held, powered Dremel Tool? Thanks again for making Friday's so wonderfully special!
After I burned out my 3rd Dremel I gave up on them. They must require a lighter touch! For small sculptures I pretty much just use a blade. On a large sculpture I will break out the power tools to clean the castings.
@@RobertTolone - Thanks!
there are times when only injection method will work, particularly with very small moulds such as- bottle tops key ring items etc s pressure is reqd to literally pump the mould solution around the mould walls to ensure no areas are not filled, but for an amateur its best to avoid syringe methods & simply increase the scale of the item some items require tiny parts that are not filled with one pour, machine individual parts on say a robot character for example or smaller areas come out warped in shape have air bubble problems. i cant imagine how a wafer thin toy car body just a skin gets cast but it does
Fact!!
Would love to see a three or a four part mold for allowing a bolt to pass through a part with different sized inlets on either side.
If you have a specific design for a part in mind send me a pic roberttolone@yahoo.com
I just watched this while I was eating. And I'm going to chew you out. What in the world were you thinking about? You left the table saw running while presenting your parts, ideas and thoughts to the audience. Not only that, but you were talking an awful risk cutting the triangles for the casting jig support.
You present a lot of good knowledge in your videos. I'll give you points for using your pusher stick on the table saw, but you used it after the instance I just mentioned.
There are two kinds of people that get injured in wood shops: newbies and old timers. Newbies because they don’t know what they’re doing, all timers because they get too confident around their tools. I’ve been standing at a table saw for 40 years and I still have all my fingers. I am never casual with any of my tools and the things I do are carefully calculated. For instance, when cutting those triangles, the risk was that the blade could bind and kick the wood back at me. I was careful to keep my hands in a position that if the wood did kick back it would push my hands away from the saw blade, not drag my fingers into the blade. I mentioned in the video that I would not like to make a living doing those cuts. By which I meant that if I had a lot of triangles to cut I would build a jig to do it quickly and safely. The safety factor I was relying on there was my total attention on the job and the position of my hands relative to the blade. But people often accuse me of setting a bad example at the table saw and for that I plead guilty.
i'm plastic injection mold maker, i agree with you.
I spent my career primarily as a toy prototype sculptor for the entertainment industry. Working with the engineers was always a fascinating experience. The manufacturing process has a huge impact on how we designed the toys.
Would it be useful to inject the resin from the bottom of the mold? It makes sense to me rather than pouring through the cavity from the top for it to flow down. It would be another piece of equipment to handle but you wouldnt need to carve a wax spout, just a hole for an injection port to fit in. Just found your channel. Really loving the insight. I'm thinking about using your silicone techniques to make molds for concrete pots and other accessories.
Displacement works really well to find a volume of resin. Dunk it in water, measure the difference. No units or math, just a general idea of how much you need, then add a little for waste.
Resin absolutely hates moisture. When using the dunk method you have to calculate the value of time it takes to dry the mold 100% before you can use it with the resin. If you leave even a tiny amount of water in the mold it will cause the resin to foam.
I'm really curious if there's a good way to reproduce a 2 part mold reliably without remaking the whole thing from scratch. Would making a really nice first mold and then just making more molds for the individual pieces work, or would that introduce too much room for error and/or flashing around the edges, particularly after multiple castings? Thanks! Your videos are awesome btw :D
what pressure do you normally have your chamber at? cheers
Horror movies make me feel less tension than videos that suddenly show risky table saw behavior.
I’ve been standing at a tablesaw for 40 years and still have all my fingers. They say there are two kinds of people who get injured in shops. Newbies who don’t know what they’re doing and old timers who are too casual and too confident with their tools. I weighed the risk of those cut carefully and judged that I could do them safely. And I did. But if I had to do those same cuts all day long I’d sure as hell set up my miter sled. Thanks for your concern, I appreciate it.
@@RobertTolone I appreciate the reply! That's good to know about the miter sled :)
I just found your videos yesterday and I've been enjoying working my way through them all.
I'm looking to make obsolete motorcycle lenses etc. Nice vid Robert
That would be cool! Let us know how they come out.
@@RobertTolone First tring to get this one lense I need. Ebay seller trying to sell me the hole fender. The other question is to mold plastic parts that are obsolete. I thought of 3d printer but then you have to CAD it.
@@redryder1312 There are many challenges when trying to reproduce existing parts. You have to get the right resin so that the part is durable and weatherproof, not to mention impervious to ultraviolet light. Another challenge is that when you mold an object in silicone rubber and cast it in resin the final copy is a tiny bit smaller than the original because there is shrinkage at both steps. So the reproduction part may not fit into the metal bezel it is attached to.
@@RobertTolone I will keep this info in mind when I try this
Hey Robert! Awesome 2 part 2 part mold video :D I was curious to why you didn't use your molding box you made as the base shape of the cradle. Do you think this could have been a bit easier if you used that original wooden box to start?
Because a mold case and a cradle have 2 very different functions. It’s almost always easier to make them as separate pieces than it is to try to modify the mold case into a cradle after the fact.
You should really turn off the table saw before trying the parts together, love this series of videos
I know. Old guy bad habits from standing at the tablesaw for 40 years.
Dear Sir, It would be great if you could tell up to what extent degradation is possible if pressurized chamber is not used at the end after pouring resin in to the mold. Thanks