|
|
Post by tgr131 on Oct 29, 2021 17:45:25 GMT -5
Greetings -
I'm trying to make a mold for some antique radio knobs that are rather tiny. I've attached a photo, I think I got a rather good impression of the outside of the knob, but I guess the center that holds the shaft must have had air in it?
This is only my third mold, and I've yet to have an unqualified success, although mold #2 did produce an ok part.
Any way to salvage this mold? Or any suggestions if I remake?
Thanks!
David
Attachments:
|
|
|
|
Post by notoes on Oct 30, 2021 10:32:30 GMT -5
Yes I think you can salvage it. That looks like Amazing Mold Maker with the short demold time, is that correct? Mix up a tiny amount of it - I'd say maybe 3g of each side (since it will be going just inside the knob) or whatever will just barely fill the inside of the center that holds the shaft and where the bubble was but be sure to leave space for the mold material that's already there.
Once you have it just under completely filled - be sure to not over fill it and you might want to give it a tiny bit of extra space to expand outward as you'll be putting it back on the mold and there is a bit of mold material inside there already. Again, be sure to not overfill it - you will be attaching new mold material to the existing mold and you don't want too much to be squished out and possibly cause it to cover the bottom design.
And before you put the knob back in place, take a toothpick and swirl it in there (be careful to not add any bubbles when you do this) to encourage any bubbles that may have gotten in there to rise and pop out of the mold material. Then carefully (but quickly, remember that it has a short open time) put the knob back in place and let it cure. Once it's cured, you should have the center part like it should have come out if the original bubble hadn't messed it up.
I hope this helps and let us know how it goes.
|
|
