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https://www.decware.com/cgi-bin/yabb22/YaBB.pl SUPPORT FORUMS FOR DECWARE SPEAKER PLANS >> DECWARE Imperial support forum >> Metric Imperial Plans https://www.decware.com/cgi-bin/yabb22/YaBB.pl?num=1182769900 Message started by Young_SC on 06/25/07 at 12:11:40 |
Title: Metric Imperial Plans Post by Young_SC on 06/25/07 at 12:11:40 Has anyone drawn up metric plans for the Imperials....yes I know the name Imperial fits imperial measurements. I can only get 18mm MDF in Australia, but 3/4 inch is effectively 19mm, so it requires a bit of a rejigging of the plans. I could draw them up myself if necessary, but hey, I'm lazy. Simon |
Title: Re: Metric Imperial Plans Post by Young_SC on 06/25/07 at 13:02:48 I should clarify, that I am interested in the SO Imperial. |
Title: Re: Metric Imperial Plans Post by Valiant on 07/04/07 at 03:33:50 Hiya Young_SC, I guess I can reply to this, I had the same problem, i.e 18mm HD Chip board. I roughly allowed for the reduction of a few mm's here and there and ended up with Imperials that where about half an inch thinner and an inch shorter than the plans. The width was about the same. I focussed on keeping the internal dimensions true to the plans, especially the speaker enclosure, the horn entry and initial folds. The horn mouth I think turned out a little larger than plan, but the sonic results where still good. I'm not sure, but if you ratio the overall speaker plan, 18/19 times whatever dimension, you get a speaker approx 4" shorter than plan, this may be a tad too much, we have effectively shrunk the Imperial. If I where to build them again, I might experiment with pieces of wood and paper and try a ratio approx 18.5/19. This should maintain the overall internal sizes and shapes, the size reduction being mainly to the outside of the speaker box and horn. You have a lot of latitude here, a few mm increments here and there will not cause major chaos. Check out my earlier postings 'Climbing the Mountain' and etc and you may get a few helpful hints from a fellow Aussie who has been down the same path you are attempting. Good Luck and I will try and stay tuned, Cheers Gary |
Title: Re: Metric Imperial Plans Post by Young_SC on 07/04/07 at 10:54:24 Hi Gary, Just bought a 12 inch driver with the right specs plus a plate amp on eBay. Next thing is wood, but if I buy it before I finish my skirting board project then the CFO may withdraw funding. :) I've got MS Visio (not the best drawing tool) which I've used for other plans, so I plan to spend a few hours drawing them up. I'll do as you suggest and try and retain the inner dimensions of the overall cabinet and make different sized cuts as appropriate. I'll have a look at your other posts as well. BTW, where in this great country do you reside? Simon |
Title: Re: Metric Imperial Plans Post by Young_SC on 07/04/07 at 14:37:49 Duh, I forgot your location is in your profile. I notice we both live in the best state in Australia. :) Alf, Mr C and Krypton need not comment here. |
Title: Re: Metric Imperial Plans Post by kbsp on 07/04/07 at 22:13:39 Young_SC wrote on 06/25/07 at 12:11:40:
Using SolidWorks 3D software I've managed to draw most of the Imp SO after the original drawings in inches. I ended up with the conclusion that there are some minor bugs in the plans from Steve. Or more certain I made the mistakes... ;) My intention was to convert the plans into metric and send them to Steve so he could distribute them so I don't break his copyright. I'll be out for the next weeks due to vacation... |
Title: Re: Metric Imperial Plans Post by Valiant on 07/05/07 at 13:47:49 Hiya Simon and kbsp, Yeah, it's a pretty good state to be in. Perhaps there may be a way for you to meet the Imperials, they currently reside in Perth, where my side kick Jake has them set up in a studio, but I don't think they have fired in anger for a while, so maybe I have to poke Jake and the Imps with a big stick shortly - but at least not until the end of August, very busy this month. I will try and put a few more pics of the Imperials on the net, check my homepage, but I don't have many Imp pics on there. I will try and rectify this week! ;) Cheers to all, Gary |
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