How To Reverse Engineer Bottle Threads

[@cad9design478]

Your suspicion the wax helps the bondo cure is spot on. You get a slight surface inhibition layer wherever a polyester resin is exposed to air. Moisture from the air inhibits the cure very slightly. You notice it when sanding. That is why you add liquid wax to gelcoats when applying it to fiberglass parts post-molding. The wax forms a skin on the surface to eliminate the inhibited layer.

[@stillpointx2623]

Wow!!! Great Video very well explained. Can you make one dealing with how to / how you measured the bottle threads with vernier calipers with single and multi start threads. So we can 3D print them?

[@BlastedBillPutt]

So glad I found this video. I was looking for a technique like this but I have threads in a stand I want to put casters on but haven't been able to find the size with trial and error

[@johnkelley9877]

That is a great way to recreate the threads. Thanks for sharing this.

[@EricStrebel]

Your welcome 😊

[@22mswartz]

Hi Eric, Awesome channel! My son is a Senior at the University taking Architecture and Design. I sent him your channel link. Keep up the great videos!

[@pheenix42]

Johnson paste wax is a great product. We used it in my printing job to keep the bed of our paper cutter from rusting.

[@paulagwhyte1720]

Thank you!

[@jamess7178]

THIS CHANNEL IS AMAZING!!!!!

[@hoodoofps]

You did exactly what I envisioned after hearing the problem at hand on hack-a-day.com. Well done!

[@Me-ob5qc]

Could you take that casting and use it to cast a cap out of molten plastic? What would you have to use as the release agent?

[@EricStrebel]

Was is a good general release agent, could work for you.

[@rogerdodger5415]

Genius! 🇺🇸🇺🇸🇺🇸

[@sasori7d494]

Nice, its useful.

[@alohathaxted]

I've been printing a lot of modular small parts and probably need to go have an injection mold made. i'm still prototyping and am wondering wether its cheaper to make a reverse mold and make it out of Bondo. i don't care about the bubbles so don't need to get a vacuum chamber for pouring plastic resins. probably cheaper the resin route? But I just need to find out if it works with out huge cost in equipment and I will need to drill parts for attachments, where I now print longitudinal holes to attach parts. its also hard to make water tight and UV resistant.

[@EricStrebel]

generally, soft tooling if the in between method for testing stuff, basically silicone molds with resin parts. Bondo could work I guess, but wont last long. silicone is really the way to go. alohathaxted let me know if you have other questions.

[@jmsaltzman]

Very cool technique! But couldn't a few measurements and a few prints narrow down the dimension? You can measure the interior diameter, so then it's a matter of a profile's overall shape and pitch. Or you could press some polyclay into the cap just for a portion of it to get the pitch and thread profile. I dunno, it's a great technique, for sure-- thanks for the details!-- but for this task, I feel like it's more trouble than it's worth!

[@EricStrebel]

jmsaltzman Perhaps...I would be a bit concerned about the clay warping or shifting when I removed it from the cap, I think it could get beat up over the time I was handling it as well. Measuring the inside of the cap even with a caliper is difficult in a concave situation. Casting the part took no more than about 35-40 minutes. Thanks for your comment, much appreciated.

[@okkrom]

Lets say I wanted the moulded part to be used in the threads and be reasonably solid and lightweight, what material would you guys recommend? For a pool cue extension specifically. So wooden threads.

[@EricStrebel]

Perhaps and epoxy, could work

[@okkrom]

Thats what I had in mind, reinforced with some wires or mesh. But will the paste wax work on wood for epoxy? I just dont want to epoxy the end of my pool cue permanently!

[@EricStrebel]

Elias Bargee you should conduct a test first but it should work.

[@fbujold]

i recently tried with my mother to buy floor wax.... and guess what you must have the same age as me, they don't sell this stuff nowhere here in Canada. Would bee's wax substitute? silicone spray? car wax?

[@EricStrebel]

Francois Bujold I would try ebay. Also, I buy the wax in my supermarket in the cleaning section! A most unusual place to find this product, I find.

[@globalns]

DIY paste waxes are caruba and/or beeswax and oil. Like this kzbin.info/www/bejne/oWrGqHypo85sY9E

[@waynehyatt5565]

Have you used the spray Pam as a release agent?

[@EricStrebel]

Nope

[@dvillalba3d]

That's genious!

[@rotate85]

You were a bit generous with the hardener there.

[@EricStrebel]

rotate85 ahhhh, yeah....:-)

[@dakotamashak2349]

Ugh, I wish I was smarter to understand this stuff. I have a great product idea but don't know where to start. This did have a lot of good info though! It at least gave me somewhere to look/start

[@EricStrebel]

Glad it was helpful!

[@greggeshelman]

Dude, nitrile gloves. Bondo is difficult to get off skin.