I was taking inventory of my speakers and found that I needed three QSI speaker boxes. I have three of the Mini-Oval Speakers by QSI but no boxes. Heck, I don't even know if QSI is still in business. The Mini-Oval Speakler is an 8 Ohm 1.0 Watt speaker. It measures .56" X 1" or 14X25 mm.
Here is what the speaker looks like.
(https://modelersforum.com/gallery/24-271215120422.jpeg)
It is small but sounds great in smaller locos with DCC sound.
I have one speaker box that fits the speaker and decided to change gears for a few hours. I took the speaker box/enclosure and placed it in a small plastic box. It was a perfect fit.
(https://modelersforum.com/gallery/24-271215120433.jpeg)
Continued in a few.
I then used Baby Powder to lightly cover the speaker box and the inside of the plastic box. This reduces the friction in the demolding process.
(https://modelersforum.com/gallery/24-271215120444.jpeg)
I used the RTV (Room Temperature Vulcanizing) from Micro-Mark. It's the 1 to 1 rapid 4-hour cure Silicone Mold Rubber.
I used a round dowel to thoroughly mix Part A and Part B.
(https://modelersforum.com/gallery/24-271215120456.jpeg)
Continued in a few.
I like using the small Dixie Cups for mixing. They have lines and other patterns on the cups. I use these lines to determine how much rubber mold compound and resin mix to use.
(https://modelersforum.com/gallery/24-271215120512.jpeg)
I used equal parts of A and B and mixed thoroughly. I then carefully poured the RTV into the plastic tray/box.
(https://modelersforum.com/gallery/24-271215120524.jpeg)
The completed mold was ready to remove after four hours but I let it sit overnight.
Continued in a few.
This morning I used a #11 Xacto knife to pry the mold out of the small plastic box.
(https://modelersforum.com/gallery/24-271215120607.jpeg)
After removing the silicone rubber mold, I removed the speaker box/enclosure.
(https://modelersforum.com/gallery/24-271215120634.jpeg)
The original speaker was then placed back into the mold for your viewing of how it looks when it is ready to be removed.
(https://modelersforum.com/gallery/24-271215120620.jpeg)
Continued in a few.
Here is a better view of the Dixie Cup.
(https://modelersforum.com/gallery/24-271215120646.jpeg)
I then mixed Part A and Part B of the casting Resin. I used the Micro_Mark CR-600 High Performance Casting Resin. After thoroughly mixing the two parts, I poured the resin mix into the rubber mold and let it harden.
(https://modelersforum.com/gallery/24-271215120656.jpeg)
NOTE: You have about two minutes to make the pour after mixing the two parts.
You can remove the new part after 30 to 60 minutes. I let it sit for about two hours as I was working on something else.
The mixture is clear but will dry to a milky white.
Continued in a few.
The new resin speaker box is white and hard.
(https://modelersforum.com/gallery/24-271215120709.jpeg)
The speaker fits into the new part with no problem. This was an easy fix to get the speaker enclosures I needed. I've made four just in case. But I'll have the rubber mold for quit some time.
(https://modelersforum.com/gallery/24-271215120723.jpeg)
Tom ;D
Nice Job....and neat too!!!!
Is that speaker similar to the ones from Digikey ?
Jim
Quote from: Donato on December 27, 2015, 01:14:44 PM
Nice Job....and neat too!!!!
Donato,
Thanks, much appreciated. This was an easy task and the RTV is great for making spare parts.
Tom ;D
Quote from: jimmillho on December 27, 2015, 01:40:50 PM
Is that speaker similar to the ones from Digikey ?
Jim
Jim,
Thanks for stopping by. I'm not familiar with the Digikey. It is a Digitrax product? I haven't found anything else the small QSI speaker will fit into other than the QSI speaker enclosure.
Tom ;D
Great job Tom.....does the sound system for the C&O J-3 need one of these super special custom built speaker boxes? ;)
Quote from: GPdemayo on December 27, 2015, 02:07:50 PM
Great job Tom.....does the sound system for the C&O J-3 need one of these super special custom built speaker boxes? ;)
Greg,
Thanks, much appreciated. No, your C&O J-3 will have a mack daddy speaker in it! No enclosure needed. The brass tender will act as the box. Some foam around the speaker will do the trick. 8)
Tom ;D
Tom,
Digikey is the Electronics Co that had the small speakers we used for the PFM System.
Jim
Quote from: jimmillho on December 27, 2015, 04:04:36 PM
Tom,
Digikey is the Electronics Co that had the small speakers we used for the PFM System.
Jim
Jim,
I don't remember the name. However, I've only used the PFM 1.5" 8 Ohm speakers from PFM/PBL. PFM is marked on the top of the speaker. This is what happens when one gets old, I just don't remember.
Tom ;D
Quote from: ACL1504 on December 27, 2015, 02:41:40 PM
Quote from: GPdemayo on December 27, 2015, 02:07:50 PM
Great job Tom.....does the sound system for the C&O J-3 need one of these super special custom built speaker boxes? ;)
Greg,
Thanks, much appreciated. No, your C&O J-3 will have a mack daddy speaker in it! No enclosure needed. The brass tender will act as the box. Some foam around the speaker will do the trick. 8)
Tom ;D
Mack daddy.....that sounds even more super dulexee ! ;D ;D ;D
Now that's a really creative solution to a problem. Creating molds and making castings of stuff is one of those things I haven't tried but intend to (someday).
Quote from: GPdemayo on December 28, 2015, 08:43:52 AM
Quote from: ACL1504 on December 27, 2015, 02:41:40 PM
Quote from: GPdemayo on December 27, 2015, 02:07:50 PM
Great job Tom.....does the sound system for the C&O J-3 need one of these super special custom built speaker boxes? ;)
Greg,
Thanks, much appreciated. No, your C&O J-3 will have a mack daddy speaker in it! No enclosure needed. The brass tender will act as the box. Some foam around the speaker will do the trick. 8)
Tom ;D
Mack daddy.....that sounds even more super dulexee ! ;D ;D ;D
Greg,
The larger speaker in a large tender has great sound.
Tom ;D