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Arash

"Anahita" speaker project

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WOW... just WOW.

 

pure awesomeness.

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WOW... just WOW.

 

pure awesomeness.

 thanks man :)

 

I think I've made a mistake converting cubic meter per hour > cubic feet per minute. our vacuum pump specification says it suck the air 240cubic meter/h. I tried google converter and it says it equals to 141 cubic feet/minute! :ph34r:   I hope that huge amount of suction wont hurt the vacuum bag or the wooden parts inside. I'll put a 2.5" tap at the entrance so hopefully I can close the tap off some degrees.

today I bought some 2.5" vacuum hose and some hi-pressure connections including a triple socket so I can connect both the CNC and the vacuum table to the vacuum pump at the same time and each will have a separate tap.

 

 

 

post-41711-0-32780000-1420032833_thumb.j

Edited by Arash

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Arash-

You are to DIY what Mt. Everest is to mountains. It's understood that your geographic situation demands extraordinary measures, but the lengths to which you go for audio excellence, as well as the results achieved, are stupendous.

I look forward to more postings. You never know, I might need some tips on hooking a vacuum pump to my CNC machine . . . in my dreams.

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Your work is amazing.  Happy New Year!  

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Arash-

You are to DIY what Mt. Everest is to mountains. It's understood that your geographic situation demands extraordinary measures, but the lengths to which you go for audio excellence, as well as the results achieved, are stupendous.

I look forward to more postings. You never know, I might need some tips on hooking a vacuum pump to my CNC machine . . . in my dreams.ha

 

thanks man for your kind words.

whenever you need help with your CNC, just whistle :)

 

 

Your work is amazing.  Happy New Year!  

 

thanks man. Happy new year to you too :rolleyes:

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still no news about the speakers. we will work on them as soon as the vacuum bag is ready to use. I need to veneer the side walls before assembly so at this stage the vacuum tube is a "must be".

I still don't know if the way we are building the vacuum bag is right or wrong. the frame we are building is huge. it's 120" x 60" and it might be 20" to 30" tall leading to a total internal volume of about 90 cubic feet, considering 141CFM pump we use, it will suck all the air within ~40seconds.

 

the other day I installed new connections so the pump is connected to CNC and the vacuum press table both at the same time but there is a separate tap for each part:

 

post-41711-0-70320000-1420311084_thumb.j

 

this hose is like an anaconda!

 

post-41711-0-43680000-1420311660_thumb.j

 

 

this is the table that is gonna be used as the vacuum press table:

 

post-41711-0-11200000-1420311863_thumb.j

 

 

we built some of these height-adjustable tables:

 

post-41711-0-07560000-1420311954_thumb.j

 

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first I had to take the old blanket off the table:

 

post-41711-0-97640000-1420312249_thumb.j

 

I decided to use the table plate which was a 3/4" BB plywood and the grid of vacuum frame to cut the cost:

 

post-41711-0-31560000-1420312272_thumb.j

 

engraving air escape grid with the big toy:

 

post-41711-0-87640000-1420312409_thumb.j

 

the grid is ready and a 2.5" hole is there as a sink. we laid it up-side-down to glue a plastic layer for sealing:

 

post-41711-0-50640000-1420312494_thumb.j

 

we decided to use Urethane glue as it puffs while drying and will fill every space, leaving less chance for air to escape:

 

post-41711-0-85760000-1420312645_thumb.j

 

then the vinyl layer:

 

post-41711-0-16080000-1420312749_thumb.j

 

and a layer of MDF with countless of staplers to make sure there will be less space for vinyl between the Plywood and MDF so the Urethane glue will fill the space even better. it's like popping a tone of corn in a matchbox! :lol:

 

post-41711-0-59880000-1420312797_thumb.j

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this is the stem valve of the table:

 

post-41711-0-46480000-1420313183_thumb.j

 

this thing is really huge 2.5" in diameter all the way to the vacuum pump:

 

post-41711-0-98600000-1420313296_thumb.j

 

some silicon glue for sealing:

 

post-41711-0-01640000-1420313317_thumb.j

 

attaching the sink:

 

post-41711-0-65200000-1420313651_thumb.j

 

 

I let it dry out and I'll work on it tomorrow:

 

post-41711-0-83200000-1420313714_thumb.j

 

this will be connected to the stem valve:

 

post-41711-0-80800000-1420313768_thumb.j

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Beautiful work, Arash! If this was covered previously, please disregard, but I'm curious about the name Anahita. Using a Google search, Anahita seems to be the Persian goddess of fertility and water. Same Anahita? Thanks.

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today we continued vacuum frame construction. now it was time for edging. we used BB plywood unusable parts we already had:

 

post-41711-0-36020000-1420377489_thumb.j

 

the edges are ~ 2" thick consisting three layers:

 

post-41711-0-80620000-1420377766_thumb.j

 

then sanding:

 

post-41711-0-07460000-1420377921_thumb.j

 

and more sanding:

 

post-41711-0-00020000-1420377948_thumb.j

 

Ali (our Afghan worker) is sanding slots:

 

post-41711-0-33780000-1420377971_thumb.j

 

this table is really big. acutally ~10inches longer than a Ping Pong table:

 

post-41711-0-75980000-1420378107_thumb.j

 

then we applied some coats of cellulose of wood sealer:

 

post-41711-0-54940000-1420378180_thumb.j

post-41711-0-55060000-1420378306_thumb.j

 

sealer coat makes the plywood much harder, it looks better as well:

 

post-41711-0-48700000-1420378336_thumb.jpost-41711-0-04780000-1420378435_thumb.j

post-41711-0-02580000-1420378400_thumb.jpost-41711-0-19660000-1420378420_thumb.j

 

we will let it dry and apply some other coats (maybe Shellac or Epoxy) tomorrow. I hope it will be dead sealed.

 

thanks for watching my madness! :)

 

 

Edited by Arash
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Nice work and it looks like an excellent work place with all the right things to get the job done!

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  Fantastic work. Jealous

 

thanks indeed :)

 

Nice work and it looks like an excellent work place with all the right things to get the job done!

 

thanks

yeah it seems so :rolleyes:

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time to build top door. I don't know why we decided to use cheap MDF :mellow: I didn't have a good feeling about at first:

 

post-41711-0-35060000-1420527294_thumb.j

 

we built two separate frame each 1.5" thick. the vinyl will be placed between the two:

 

post-41711-0-31540000-1420527394_thumb.j

 

some wood sealer coats:

 

post-41711-0-56100000-1420527611_thumb.j

 

using some silicon glue on both frame for better sealing. I built something to trowel the glue with ~1mm thickness:

 

post-41711-0-52140000-1420527665_thumb.j

 

not bad at all!

 

post-41711-0-52060000-1420527802_thumb.j

 

we engraved a slot in the table edges to put some sealing rubbers:

 

post-41711-0-71220000-1420527848_thumb.j

 

post-41711-0-49100000-1420527918_thumb.jpost-41711-0-22380000-1420527968_thumb.j

 

and it was done for now:

 

post-41711-0-20900000-1420527987_thumb.j

 

we opened the tap and the pump evacuated all the air in a New York minute! :o  the frame was about to rip apart! 3" think of MDF was not standing the pressure so I aborted the mission. the vacuum is way more than what I expected. the table itself is OK but the frame that holds the vinyl is apparently weak for the application. it needs supports. we may build that part again with aluminum or steel parts. today I'm gonna to buy some clamps/fixtures. for now one thing is certain, we can't open the tap completely it may harm the vinyl, frame or the part under vacuum.

 

thanks for watching :wub:

 

 

 

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after some days working on a vacuum bag I found myself wanting to work on speakers and not beat around the bush.

time to assemble the parts of bassbin:

 post-41711-0-84080000-1421000951_thumb.jpost-41711-0-07400000-1421001011_thumb.jpost-41711-0-24080000-1421001053_thumb.jpost-41711-0-08160000-1421001133_thumb.jpost-41711-0-05520000-1421001169_thumb.j

 

some sanding on top and bottom. I started with rotary but I ended up sanding with hand:

 

post-41711-0-05520000-1421001169_thumb.j

 

time to cut dog-house parts. it's very tricky. table saws don't cut angles more that 46 degrees normally. we should cut the part standing vertically and keeping them in that position is a bit tricky:

post-41711-0-36440000-1421001317_thumb.jpost-41711-0-23680000-1421001426_thumb.j

 

we cut the woofer mounting plate. there are holes in it to let air through reflectors in order to have more back chamber volume. I used T-nuts for woofer mounting and added some PVC glue:

 

post-41711-0-37880000-1421001464_thumb.jpost-41711-0-96400000-1421001615_thumb.j

 

reflectors:

 

post-41711-0-22080000-1421001748_thumb.jpost-41711-0-19360000-1421001804_thumb.j

 

post-41711-0-09880000-1421001834_thumb.jpost-41711-0-55520000-1421002241_thumb.j

 

almost done:

 

post-41711-0-55440000-1421002300_thumb.j

 

checking if the dog-house will fit in there: check

 

post-41711-0-08040000-1421002372_thumb.j

 

it's how the woofer chamber looks like:

 

post-41711-0-04040000-1421002475_thumb.j

 

the back part of bassbin is yet to be installed so we can see how woofer exit look from this point of view. an extra piece will be added to woofer exit as reflector we couldn't build due to shortage of time. it will be place for vertical dispersion at woofer exit just where you can see T-nuts:

 

post-41711-0-27160000-1421002545_thumb.j

 

not aligned and glued yet but give an idea how it will look like:

 

post-41711-0-85880000-1421002763_thumb.j

 

one of the most important part of bassbins! braces:

 

post-41711-0-39760000-1421002827_thumb.jpost-41711-0-66600000-1421002903_thumb.j

 

thanks for watching.

 

 

 

Edited by Arash
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It's going great. I can't wait to see the finished product. I hope you achieve good results in the sound department too! You are evidently going to be successful in the looks department.

 

Finish this and start measuring and sharing the info! Who knows maybe in the future I will ask for one for the centre channel :)

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Very nice work, no one can ever say you take the easy way out, very patient and well thought out. 

 

First class :emotion-21:

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It's going great. I can't wait to see the finished product. I hope you achieve good results in the sound department too! You are evidently going to be successful in the looks department.

 

Finish this and start measuring and sharing the info! Who knows maybe in the future I will ask for one for the centre channel :)

 

thank you

for sure I'll let you guys know how this cabinet will result with different drivers

 

Very nice work, no one can ever say you take the easy way out, very patient and well thought out. 

 

First class :emotion-21:

 

thanks dude :)

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